Calviño Tavares, Francisco
Total activity: 318
Areas of expertise
Active Teaching and Learning Methodologies, Experimental Nuclear Physics, University Management
Professional category
University lecturer
Doctoral courses
Doctor en Ciencias Físicas
Research group
GREENER - Research group on studies in energy and radiation.
Department
Department of Physics and Nuclear Engineering
Institute
Institute of Energy Technology
School
Barcelona School of Industrial Engineering (ETSEIB)
E-mail
francisco.calvinoupc.edu
Contact details
UPC directory Open in new window
Collaborative networks
   
Links of interest
CERN Open in new window
Researcher ID Open in new window
Richard Felder. Resources in Science and Engineering Education Open in new window

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1 to 50 of 318 results
  • SOLVING CHALLENGES IN NUCLEAR DATA

     Cortes Rossell, Guillem Pere; Pretel Sanchez, M. del Carmen; Calviño Tavares, Francisco
    Competitive project

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  • Master in Nuclear Engineering in Barcelona: aligning university, utility and society objectives

     Batet Miracle, Lluis; Calviño Tavares, Francisco; Dies Llovera, Javier; Duch Guillen, Maria Amor; del Val, Luis; Fernández Olano, Pablo
    Nuclear Education and Training
    p. 411-419
    Presentation's date: 2013-11-19
    Presentation of work at congresses

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  • Máster en Ingeniería Nuclear por la UPC (Máster UPC-ENDESA). Confluencia de objetivos de la universidad, la empresa y la sociedad

     Batet Miracle, Lluis; Duch Guillen, Maria Amor; Calviño Tavares, Francisco; Dies Llovera, Javier; del Val, Luis; Fernández Olano, Pablo
    Reunión Anual de la Sociedad Nuclear Española
    p. 1-7
    Presentation's date: 2013-09-24
    Presentation of work at congresses

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    El Máster en Ingeniería Nuclear por la UPC pretende formar ingenieros nucleares con un nivel alto de competencias que les permitan optar a puestos de responsabilidad en empresas del sector. El Máster cuenta con el patrocinio de ENDESA y la colaboración de entidades y empresas del sector. El Máster está impartido completamente en inglés y está imbricado en EMINE, European Master in Innovation in Nuclear Energy (KIC-InnoEnergy).

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    Measurements of neutron cross sections for advanced nuclear energy systems at n-TOF (CERN)  Open access

     Barbagallo, Massimo; Colonna, Nicola; Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Riego Pérez, Albert
    International Nuclear Physics Conference
    p. 10001-p.1-10001-p.4
    DOI: 10.1051/epjconf/20146610001
    Presentation's date: 2013-06
    Presentation of work at congresses

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    The n-TOF facility operates at CERN with the aim of addressing the request of high accuracy nuclear data for advanced nuclear energy systems as well as for nuclear astrophysics. Thanks to the features of the neutron beam, important results have been obtained on neutron induced fission and capture cross sections of U, Pu and minor actinides. Recently the construction of another beam line has started; the new line will be complementary to the first one, allowing to further extend the experimental program foreseen for next measurement campaigns.

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    The nucleosynthesis of heavy elements in Stars: The key isotope 25Mg  Open access

     Massimi, Cristian; Koehler, Paul E.; Kopecky, Stefan; Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere
    International Nuclear Physics Conference
    p. 1-4
    DOI: 10.1051/epjconf/20146607016
    Presentation's date: 2013-06-02
    Presentation of work at congresses

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    We have measured the radiative neutron-capture cross section and the total neutron-induced cross section of one of the most important isotopes for the s process, the 25Mg. The measurements have been carried out at the neutron time-of-flight facilities n-TOF at CERN (Switzerland) and GELINA installed at the EC-JRC-IRMM (Belgium). The cross sections as a function of neutron energy have been measured up to approximately 300 keV, covering the energy region of interest to the s process. The data analysis is ongoing and preliminary results show the potential relevance for the s process. © Owned by the authors, published by EDP Sciences, 2014.

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    238U(n, gamma) reaction cross section measurement with C6D6 detectors at the n_TOF CERN facility.  Open access

     Mingrone, Federica; Massimi, Cristian; Vannini, Gianni; Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Hernandez Prieto, Alvaro; Riego Pérez, Albert
    International Nuclear Physics Conference
    p. 1-4
    DOI: 10.1051/epjconf/20146603061
    Presentation's date: 2013-06-02
    Presentation of work at congresses

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    The radiative capture cross section of 238U is very important for the developing of new reactor technologies and the safety of existing ones. Here the preliminary results of the 238U(n,¿) cross section measurement performed at n-TOF with C6D6 scintillation detectors are presented, paying particular attention to data reduction and background subtraction. © Owned by the authors, published by EDP Sciences, 2014.

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    Máster en Ingeniería Nuclear por la UPC (Máster UPC-ENDESA). Balance de la primera edición  Open access

     Batet Miracle, Lluis; Duch Guillen, Maria Amor; Calviño Tavares, Francisco; del Val, Luis; Fernández Olano, Pablo
    Reunión Anual de la Sociedad Nuclear Española
    p. 1-8
    Presentation's date: 2012-10-18
    Presentation of work at congresses

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    El Máster en Ingeniería Nuclear por la UPC, está orientado a la formación de ingenieros nucleares con un nivel alto de competencias que les permitan optar a puestos de responsabilidad en empresas del sector. El máster, que ha iniciado su andadura durante el curso 2011-2012, cuenta con el patrocinio de ENDESA y la colaboración de entidades y empresas del sector. En esta ponencia se realiza un balance de los dos primeros semestres del máster y se describen los puntos fuertes y las oportunidades de mejora detectados. En el análisis se ha tenido en cuenta el rendimiento académico de los estudiantes, sus impresiones y el grado de satisfacción. La información se ha recogido a través de encuestas, entrevistas personales y reuniones con todo el grupo de estudiantes. Los 90 créditos ECTS del Máster se reparten en asignaturas obligatorias (46,5) y optativas (13,5) y prácticas externas y Proyecto Final. La participación de expertos externos a la universidad ha sido muy alta (casi un 50 % de la docencia), especialmente en las materias de Gestión de Plantas y Normativa y Seguridad. Todas las materias incluyen actividades basadas en aprendizaje activo y trabajo en equipo: se consigue así que el sistema de evaluación sea una parte integral e inseparable del proceso de aprendizaje. En cada uno de los dos semestres lectivos, los estudiantes desarrollan un proyecto transversal en grupos de tres o cuatro miembros. En general el grado de satisfacción del alumnado es muy bueno, pero se han detectado algunos aspectos referentes a la distribución de la carga de trabajo y a los mecanismos de evaluación que han sido mejorados sobre la marcha. Estas mejoras se incorporarán en la edición de 2012-2013. Creemos que el Máster satisface las expectativas del sector y de la sociedad a la vez que presenta un gran atractivo para los estudiantes.

  • ß-delayed neutron emission measurements around the third r-process abundance peak

     Caballero Folch, Roger; Domingo Pardo, César; Taín, J.L.; Cortes Rossell, Guillem Pere; Gómez Hornillos, María Belén; Calviño Tavares, Francisco; Riego Pérez, Albert
    La Rábida, International Scientific Meeting on Nuclear Physics
    p. 137-139
    DOI: 10.1063/1.4810816
    Presentation's date: 2012-09-09
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    This contribution summarizes an experiment performed at GSI (Germany) in the neutron-rich region beyond N=126. The aim of this measurement is to provide the nuclear physics input of relevance for r-process model calculations, aiming at a better understanding of the third r-process abundance peak. Many exotic nuclei were measured around 211Hg and 215Tl. Final ion identification diagrams are given in this contribution. For most of them, we expect to derive halflives and and ß -delayed neutron emission probabilities. The detectors used in this experiment were the Silicon IMplantation and Beta Absorber (SIMBA) detector, based on an array of highly segmentedsilicon detectors, and the BEta deLayEd Neutron (BELEN) detector, which consisted of 30 3He counters embedded in a polyethylene matrix.

  • ß-delayed neutron emission measurements around the third r-process abundance peak

     Caballero Folch, Roger; Domingo Pardo, César; Cortes Rossell, Guillem Pere; Calviño Tavares, Francisco; Riego Pérez, Albert
    International Symposium on Nuclei in the Cosmos
    Presentation's date: 2012-08-06
    Presentation of work at congresses

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    The elements heavier than iron are produced in the Universe mainly by means of the slow (s) and rapid (r) neutron capture processes (for a recent review see e.g. [1]). The latter nucleosynthesis mechanism occurs between the valley of stability and the neutron drip line, passing along the neutron shell closures where exceptionally long half-lives and small neutron capture cross sections yield the three characteristic abundance maxima at A ~ 80, 130 and 195.

  • Measurement of the fission fragment angular distribution for Th-232(n,f) at the CERN n-TOF facility

     Tarrío, D.; Tassan Got, Laurence; Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Gómez Hornillos, María Belén; Riego Pérez, Albert
    International Conference on Nuclear Reaction Mechanisms
    p. 253-260
    Presentation's date: 2012-06
    Presentation of work at congresses

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    A fission reaction chamber was designed to measure the angular distribution of the fragments emitted in neutron-induced fission reactions at n-TOF. Up to ten Parallel Plate Avalanche Counters can be included and kept at controlled low-pressure gas. Counters are tilted 45° with respect to the neutron beam direction and up to nine targets can be interleaved in between. A first measurement of the 232Th(n,f) was recently done and preliminary experimental results demonstrating the suitability of the setup are presented here.

  • Nuclear Astrophysics at n-TOF, CERN

     Tagliente, G.; Abbondanno, U.; Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch, A.; Pretel Sanchez, M. del Carmen
    International Conference on Nuclear Reaction Mechanisms
    p. 503-509
    Presentation's date: 2012-06
    Presentation of work at congresses

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    The neutron time of flight (n-TOF) facility at CERN is a spallation neutron source with white neutron energy spectrum (from thermal to several GeV), covering the full energy range of interest for nuclear astrophysics, in particular for measurements of the neutron capture cross section required in s-process nucleosynthesis. This contribution presents an overview on the astrophysical program carried on at the n-TOF facility, the main results and their implications.

  • FPA2011-28770-C03-03 Datos nucleares para física nuclear e ingeniería nuclear

     Calviño Tavares, Francisco; Batet Miracle, Lluis; Pretel Sanchez, M. del Carmen; Cortes Rossell, Guillem Pere; Caballero Folch, Roger
    Competitive project

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  • Datos nucleares para física nuclear e ingeniería nuclear

     Gómez Hornillos, María Belén; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Riego Pérez, Albert; Pretel Sanchez, M. del Carmen; Caballero Folch, Roger; Batet Miracle, Lluis; Calviño Tavares, Francisco
    Competitive project

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  • Collimation and Beam Loss Studies in High-Intensity Synchrotrons

     Barranco García, Javier
    Department of Physics and Nuclear Engineering, Universitat Politècnica de Catalunya
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    Present status and future programs of the n-TOF experiment  Open access

     Chiaveri, E.; Calviani, M.; Andriamonje, S.; Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Riego Pérez, Albert; Gómez Hornillos, María Belén; Vlachoudis, V.; Massimi, Cristian
    International Workshop on Compound Nuclear Reactions and Related Topics
    p. 1-13
    DOI: 10.1051/epjconf/20122103001
    Presentation's date: 2011-09
    Presentation of work at congresses

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    The neutron time-of-flight facility n_TOF at CERN, Switzerland, operational since 2001, delivers neutrons using the Proton Synchrotron (PS) 20 GeV/c proton beam impinging on a lead spallation target. The facility combines a very high instantaneous neutron flux, an excellent time of flight resolution due to the distance between the experimental area and the production target (185 meters), a low intrinsic background and a wide range of neutron energies, from thermal to GeV neutrons. These characteristics provide a unique possibility to perform neutron-induced capture and fission cross-section measurements for applications in nuclear astrophysics and in nuclear reactor technology. The most relevant measurements performed up to now and foreseen for the future will be presented in this contribution. The overall efficiency of the experimental program and the range of possible measurements achievable with the construction of a second experimental area (EAR-2), vertically located 20 m on top of the n_TOF spallation target, might offer a substantial improvement in measurement sensitivities. A feasibility study of the possible realisation of the installation extension will be also presented.

  • New Master in Nuclear Engineering in Barcelona: a sinergetic effort of University and utility

     Batet Miracle, Lluis; Calviño Tavares, Francisco; Duch Guillen, Maria Amor; Consul Porras, M. Nieves; Oriol, Carlos; del Val, Luis; Fernández Olano, Pablo
    Nuclear Education and Training
    p. 227-231
    Presentation's date: 2011-05-17
    Presentation of work at congresses

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  • Máster en Ingeniería Nuclear por la UPC (Máster UPC-ENDESA)

     Batet Miracle, Lluis; Duch Guillen, Maria Amor; Calviño Tavares, Francisco; del Val, Luis; Fernández Olano, Pablo
    Sociedad Nuclear Española. Reunión
    p. 1-6
    Presentation's date: 2011
    Presentation of work at congresses

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  • Contribución española a los gastos mantenimiento y operación del experimento N_TOF(CERN)para el año 2010

     Calviño Tavares, Francisco; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen; Gómez Hornillos, María Belén; Cortes Rossell, Guillem Pere
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    Commissionning of the n_TOF-Ph2 facility  Open access

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Gómez Hornillos, María Belén
    PHYSOR 2010 ¿ Advances in Reactor Physics to Power the Nuclear Renaissance
    p. 1-9
    Presentation's date: 2010
    Presentation of work at congresses

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    The white spectrum neutron time-of-flight facility n_TOF is operating at CERN since 2001. The neutron beam has a very high instantaneous flux and high resolution in energy and it is delivered in the experimental area located 187 m downstream from the spallation target. The intense neutron fluence per proton burst results in a much enhanced signal to background ratio for neutron capture and fission reactions on radioactive isotopes, thus making the facility well suited for accurate measurement of neutron-induced reaction cross-sections. This is especially true to highly radioactive targets which are of major importance in new nuclear energy system such as Gen-IV reactors, especially those with fast spectrum. Combined with state-of-the-art detectors and with advanced data acquisition systems, the innovative characteristics of the n_TOF neutron beam allow collecting data on a variety of stable and radioactive isotopes of interest for nuclear astrophysics and for applications to advanced reactor technologies.

  • Measurements of high-energy neutron-induced fission of nat-Pb and 209-Bi

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    EFNUDAT ¿ Measurements and Models of Nuclear Reactions
    p. 1-6
    DOI: 10.1051/epjconf/20100807009
    Presentation's date: 2010
    Presentation of work at congresses

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  • Redundancy of the LHC Machine Protection Systems in Case of Magnet Failures.  awarded activity

     Gómez Alonso, Andrés
    Department of Physics and Nuclear Engineering, Universitat Politècnica de Catalunya
    Theses

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  • CENTRO NACIONAL DE FÍSICA DE PARTÍCULAS,ASTROPARTÍCULAS Y NUCLEAR (CPAN)

     Caballero Folch, Roger; Cortes Rossell, Guillem Pere; Gómez Hornillos, María Belén; Calviño Tavares, Francisco
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  • 2009-SGR-1068 Grup de Recerca Consolidat (Transmutació de Residus Radioactius)

     Pretel Sanchez, M. del Carmen; Cortes Rossell, Guillem Pere; Calviño Tavares, Francisco; Poch Pares, Agusti; Gómez Hornillos, María Belén
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  • FPA2008-04972-C03-03 Datos Nucleares Para Física Nuclear e Ingeniería Nuclear

     Pretel Sanchez, M. del Carmen; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Gómez Hornillos, María Belén; Caballero Folch, Roger; Riego Pérez, Albert; Calviño Tavares, Francisco
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  • Fission cross-section measurements on 233-U and minor actinides at the CERN n_TOF facility

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    International Workshop on Nuclear Fission and Fission-Product Spectroscopy
    p. 211-218
    DOI: 10.1063/1.3258226
    Presentation's date: 2009
    Presentation of work at congresses

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  • Astrophysics at n_TOF facility

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    Latin American Symposium on Nuclear Physics and Applications
    p. 160-165
    DOI: 10.1063/1.3480156
    Presentation's date: 2009
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  • Study of Neutron-Induced Fission Cross Sections of U, Am, and Cm at n_TOF

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    Latin American Symposium on Nuclear Physics and Applications
    p. 477-482
    DOI: 10.1063/1.3480244
    Presentation's date: 2009
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  • Neutron-induced fission cross sections of 233-U and 243-Am in the energy range 0.5 Mev< En < 20 MeV @ n_TOF

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    International Conference on Nuclear Reaction Mechanisms
    p. 231-238
    Presentation's date: 2009
    Presentation of work at congresses

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    Neutron-induced fission cross-sections of actinides have been recently measured at the neutron time of flight facility n_TOF at CERN in the frame of a research project involving isotopes relevant for nuclear astrophysics and nuclear technologies. Fission fragments are detected by a gas counter with good discrimination between nuclear fission products and background events. Neutron-induced fission cross-sections of 233U and 243Am were determined relative to 235U. The present paper reports the results obtained at neutron energies between 0.5 and 20 MeV.

  • The management of a Large Scale Project in Particle Accelerators: The Commissioning of the Technical Systems in the LHC  awarded activity

     Barbero Soto, Esther
    Department of Physics and Nuclear Engineering, Universitat Politècnica de Catalunya
    Theses

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  • n_TOF experiment: past, present and future

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    Ulaanbaatar Conference on Nuclear Physics and Applications
    p. 78-83
    DOI: 10.1063/1.3122266
    Presentation's date: 2008
    Presentation of work at congresses

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  • Neutron capture measurements at the n_TOF facility

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    Ulaanbaatar Conference on Nuclear Physics and Applications
    p. 84-89
    DOI: 10.1063/1.3122267
    Presentation's date: 2008
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    Measurement of the 197-Au(n,gamma ) cross section at n_TOF, - a step forward towards a new standard for capture cross section measurements  Open access

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    International Symposium on Nuclear Astrophysics - Nuclei in the Cosmos
    p. 1-4
    Presentation's date: 2008
    Presentation of work at congresses

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    The accurate knowledge of the 197Au(n,g ) reaction cross section is of great importance, since this reaction if often used as a reference in capture cross section measurements relevant to Nuclear Astrophysics, as well as for neutron flux determination in nuclear power reactors. With the aim of improving the accuracy of the neutron capture cross section on 197Au, extensive measurements were performed at the n_TOF facility at CERN with two detection systems: a total absorption calorimeter and a set of C6D6 detectors. The capture yield and the resonance parameters have been determined in the energy range from 1 eV to 5 keV and compared with evaluated data files. The present capture kernels are on average in good agreement with tabulated data, although sizable differences are observed for several resonances. A few new resonances are also reported.

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    Measurements of 90,91,92,93,94,96-Zr neutron capture cross sections at the n_TOF facility at CERN  Open access

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    International Symposium on Nuclear Astrophysics - Nuclei in the Cosmos
    p. 1-5
    Presentation's date: 2008
    Presentation of work at congresses

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    Neutron capture cross sections for zirconium isotopes have important implications in the field of nuclear astrophysics. In particular they play a key role in ascertaining the neutron density in the He burning zone of the Red Giant stars. Neutron capture cross sections of 90,91,92,93,94,96Zr have been measured over the energy range from 1 eV to 1 MeV at the spallation neutron facility n_TOF at CERN. Based on these data, capture resonance strengths and Maxwellian-averaged cross sections were determined with much improved accuracy.

  • Recent results at n_TOF and future perspectives

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    Torino Workshop on Evolution and Nucleosynthesis in AGB Stars
    p. 90-97
    DOI: 10.1063/1.2916994
    Presentation's date: 2007
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    Capture cross section measurements of 186,187,188-Os at n TOF: the resolved resonance region  Open access

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    International Conference on Nuclear Data for Science and Technology
    p. 599-602
    DOI: 10.1051/ndata:07519
    Presentation's date: 2007
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    The neutron capture cross sections of 186,187,188Os have been measured at the CERN neutron time-of-flight facility, n TOF, in the neutron energy range from 1 eV up to 1MeV. In this contribution, we report the results of the analysis of the resolved resonance region (RRR). Resonance parameters have been extracted from a full R-matrix fit of the capture yields with the SAMMY code. A statistical analysis has been performed and the related average resonance parameters are derived. This information is crucial for a complete understanding and modeling in terms of the Hauser-Feshbach statistical model of the capture and inelastic reaction channels, required for the evaluation of the stellar reaction rates of these isotopes. Maxwellian average cross sections for the range of temperatures relevant for s-process nucleosynthesis have been derived from the combined information of the experimental data in the resolved and unresolved resonance regions. A brief account of the implications of this analysis in the estimation of the s-process component of the 187Os abundance and the related impact on the estimates of the time-duration of the galactic nucleosynthesis through the Re/Os clock is given.

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    Measurement of the 197-Au(n,gamma) cross section at n TOF: towards a new standard  Open access

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    International Conference on Nuclear Data for Science and Technology
    p. 1265-1268
    DOI: 10.1051/ndata:07554
    Presentation's date: 2007
    Presentation of work at congresses

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    Two different detectors and techniques are employed at n TOF facility, at CERN, to improve the accuracy of the neutron capture cross section of 197Au(n,γ): a total absorption calorimeter and a set of C6D6. The accurate knowledge of this cross section is of great importance for all the (n,γ) reactions study. The neutron capture cross section and nuclear resonce parameters of the 197Au have been measured in the energy range of 1 eV to 1 kev. The present work shows in average a good agreement with evaluated data libraries, although sizeable differences have been observed for some resonances. Two new resonances have also been discovered. The accuracy of the resonance partial widths has been improved and the main nuclear quantities such as the neutron strength function have been extracted.

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    Measurement of the 90,91,92,93,94,96-Zr(n,gamma) and 139-La(n,gamma) cross sections at n TOF  Open access

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    International Conference on Nuclear Data for Science and Technology
    p. 1303-1306
    DOI: 10.1051/ndata:07732
    Presentation's date: 2007
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    Neutron capture cross sections of Zr and La isotopes have important implications in the field of nuclear astrophysics as well as in the nuclear technology. In particular the Zr isotopes play a key role for the determination of the neutron density in the He burning zone of the Red Giant star, while the 139La is important to monitor the s-process abundances from Ba up to Pb. Zr is also largely used as structural materials of traditional and advanced nuclear reactors. The nuclear resonance parameters and the cross section of 90,91,92,93,94,96Zr and 139La have been measured at the n TOF facility at CERN. Based on these data the capture resonance strength and the Maxwellian-averaged cross section were calculated.

  • Evaluation of scatter and partial volume effect corrections in the quantification of neuroreceptor SPET studies with 123-I-labeled radioligands

     Calviño Tavares, Francisco; Sempau Roma, Josep
    Annual Congress of the European Association of Nuclear Medicine
    p. 262
    Presentation's date: 2007
    Presentation of work at congresses

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    Improved lead and bismuth (n,gamma) cross sections and their astrophysical impact  Open access

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    International Conference on Nuclear Data for Science and Technology
    p. 1311-1314
    DOI: 10.1051/ndata:07493
    Presentation's date: 2007
    Presentation of work at congresses

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    A series of (n,γ) neutron capture measurements on the lead isotopes and bismuth have been carried out at the CERN n TOF installation in the neutron energy range from 1 eV up to 1MeV. At n TOF, contaminations due to scattered neutrons were reduced down to a negligible level by using improved γ-ray detectors with very low neutron sensitivity. The background level has been determined precisely from a complementary measurement. Other experimental effects related to the electronic threshold in the detectors and the angular distribution of the prompt γ-rays were investigated via Monte Carlo simulations and could be taken in account in the analysis of the capture data. With this set of measurements the energy differential (n,γ) cross sections of 204,206,207Pb and 209Bi have been determined with good accuracy. The information obtained in this work becomes of interest for constraining r-process calculations and in particular for the Th/U cosmochronometer.

  • Measurement of the Neutron Induced Fission Cross Section on Transuranic (TRU) Elements at the n_TOF Facility at CERN

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    Latin American Symposium on Nuclear Physics and Applications
    p. 43-48
    DOI: 10.1063/1.2813848
    Presentation's date: 2007
    Presentation of work at congresses

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    Simultaneous measurement of the neutron capture and fission yields of 233-U  Open access

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    International Conference on Nuclear Data for Science and Technology
    p. 571-574
    DOI: 10.1051/ndata:07665
    Presentation's date: 2007
    Presentation of work at congresses

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    We have measured the neutron capture and fission cross section of 233U at the neutron time-of-flight facility n TOF at CERN in the energy range from 1 eV to 1 MeV with high accuracy by using a high performance 4π BaF2 Total Absorption Calorimeter (TAC) as a detection device. The method, based on the TAC energy response study, allowing to disentangle between γ’s originating from fission and capture will be presented as well as the first very preliminary results.

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    The neutron capture cross sections of 237Np(n,gamma) and 240Pu(n,gamma) and its relevance in the transmutation of nuclear waste  Open access

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    International Conference on Nuclear Data for Science and Technology
    p. 627-630
    DOI: 10.1051/ndata:07496
    Presentation's date: 2007
    Presentation of work at congresses

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    Neutron capture cross sections of actinides are of great relevance for the Transmutation of Nuclear Waste in Accelerator Driven Systems (ADS) and Generation-IV reactors. The neutron capture cross sections of 237Np and 240Pu were measured at the n TOF facility with a Total Absorption Calorimeter. The data have been analyzed with the SAMMY code. The corresponding covariance matrices have been generated. The final cross sections are presented and compared to the previously existing ones.

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    The 234U neutron capture cross section measurement at the n TOF facility  Open access

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    International Conference on Nuclear Data for Science and Technology
    p. 595-598
    DOI: 10.1051/ndata:07510
    Presentation's date: 2007
    Presentation of work at congresses

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    The neutron capture cross-section of 234U has been measured for energies from thermal up to the keV region in the neutron time-of-flight facility n TOF, based on a spallation source located at CERN. A 4π BaF2 array composed of 40 crystals, placed at a distance of 184.9 m from the neutron source, was employed as a total absorption calorimeter (TAC) for detection of the prompt γ-ray cascade from capture events in the sample. This text describes the experimental setup, all necessary steps followed during the data analysis procedure. Results are presented in the form of R-matrix resonance parameters from fits with the SAMMY code and compared to the evaluated data of ENDF in the relevant energy region, indicating the good performance of the n TOF facility and the TAC.

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    Neutron resonance spectroscopy at n TOF at CERN  Open access

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    International Conference on Nuclear Data for Science and Technology
    p. 537-542
    DOI: 10.1051/ndata:07690
    Presentation's date: 2007
    Presentation of work at congresses

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    Neutron resonance spectroscopy plays an important role in the investigation of neutron induced reaction cross sections and nuclear structure in the MeV excitation range. Neutron time-of-flight facilities are the most used installations to explore neutron resonances. In this paper we describe the basic features of neutron resonance spectroscopy together with recent results from the time-of-flight facility n TOF at CERN.

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    Measurement of neutron induced fission of 235-U, 233-U and 245-Cm with the FIC detector at the CERN n TOF facility  Open access

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    International Conference on Nuclear Data for Science and Technology
    p. 335-338
    DOI: 10.1051/ndata:07750
    Presentation's date: 2007
    Presentation of work at congresses

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    A series of measurements of neutron induced fission cross section of various TRU isotopes have been performed at the CERN n TOF spallation neutron facility, in the energy range from thermal to nearly 250 MeV. The experimental apparatus consists in a fast ionization chamber (FIC), used as a fission fragment detector with a high efficiency. Good discrimination between alphas and fission fragments can be obtained with a simple amplitude threshold. In order to allow the monitoring of the neutron beam and to extract the n TOF neutron flux, the well known cross section of the 235U(n,f) reaction, considered as a fission standard, has been used. Preliminary results for the cross section are shown for some selected isotopes such as 235U, 233U and 245Cm in the energy range from 0.050 eV to about 2MeV.

  • New developments on preparation of cooled and bunched radioactive ion beams at ISOL-Facilities: The ISCOOL project and the rotating wall cooling  Open access  awarded activity

     Podadera Aliseda, Ivan
    Department of Physics and Nuclear Engineering, Universitat Politècnica de Catalunya
    Theses

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    Last years have become very productive for the research, construction and development of new facilities devoted to the production of beams with exotic radioisotopes (Radioactive Ion Beams, RIB). These beams are later used for experiments in fields like nuclear physics, atomic physics, astrophysics or medicine, among others. Within this kind of facilities, the ISOL facilities stand out. They are based on the on-line separation of radioactive isotopes produced in nuclear reactions between a target and a high-energy proton beam. The ISOL method was the pioneer for these facilities and it has kept up to now the leadership of RIB facilities. The main reason is ISOLDE, an ISOL facility located at CERN, the largest accelerator complex in the world, where this doctoral thesis has been carried out.The first innovation which is described is the design of an ion trap for the cooling and bunching of RIB's for ISOLDE, the so-called ISCOOL (ISOLDE COOLer). It is an Radio Frequency Quadrupole ion Cooler and Buncher (RFQCB), device based on the Paul traps. In these traps, the ions are confined in the three dimensions by electric fields. The ions are confined on the transverse plane with the pseudopotential well created by the Radio Frequency Quadrupole (RFQ) and focused on the longitudinal axis. At the same time, a gas (normally helium) fills the chamber with a pressure between 10-3 and 10-2 mbar. The collisions between the atoms or molecules of the gas and the ions. In addition, to drive the ions to the extraction of the RFQCB, an axial electric field is created by segmented electrodes. Different voltages are applied to these electrodes in order to choose the shape of the field. The shape can be chosen to create a potential well close to the extraction from the RFQCB in which the ions are accumulated and extracted as bunches, by the fast-switch of the voltages applied to the axial electrodes.The new ISCOOL will be installed as a permanent device of the ISOLDE beam lines.

  • Nuclear Engineering at the Escola Tecnica Superior d'Enginyers Industrials de Barcelona

     Calviño Tavares, Francisco
    2nd Workshop on European Collaboration for Higher Education and Research in Nuclear Engineering and Radiological Protection
    p. 1-11
    Presentation's date: 2006-03-13
    Presentation of work at congresses

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    Measurement of the neutron capture cross section of 236-U  Open access

     Calviño Tavares, Francisco; Cortes Rossell, Guillem Pere; Poch Pares, Agusti; Pretel Sanchez, M. del Carmen
    International Topical Meeting on Advances in Reactor Physics
    p. 1-9
    Presentation's date: 2006
    Presentation of work at congresses

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    In this paper we describe the 236U(n,γ) reaction cross section measurement at the GELINA white pulsed neutron source of the Institute for Reference Materials and Measurements (IRMM) in Geel. The sample was placed in the neutron beam at a flight station located at a nominal distance of 30 m from the neutron source. Neutron capture gamma rays were detected by two C6D6-based liquid scintillator gamma-ray detectors as a function of the neutron time-of-flight using the pulse height weighting technique. The pulse height weighting function has been derived from Monte Carlo simulations of the detector response to mono-energetic gamma rays. The shape of the neutron flux was measured with a 10B chamber, placed about 60 cm upstream in the neutron beam. The capture yield in the resolved resonance region up to 3 keV has been derived and will be presented here. The analysis of the capture yield in terms of Rmatrix resonance parameters is planned for the near future.

  • 9è Premi a la Qualitat en la Docència Universitària

     Domingo Peña, Joan; Valero Garcia, Miguel; Calviño Tavares, Francisco; Armengol Cebrian, Jesús; Bara Temes, Francisco Javier; Almajano Pablos, Maria Pilar; Robert i Sanxis, Francesc Josep; Pretel Sanchez, M. del Carmen; Usandizaga Calparsoro, Miguel M.; Giraldo Giraldo, Beatriz F.; Gomez Urgelles, Joan Vicenç; Gorchs Altarriba, Roser; Perez Poch, Antoni; Cadenato Matia, Ana Maria; Benitez Iglesias, Raul; Guerrero Zapata, Josep Maria; Navarro Moldes, Leandro; Jordana Barnils, Josep; Martínez García, Herminio
    Award or recognition

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