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. ). 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.
Caballero-Folch, R. [et al.]. ß-delayed neutron emission measurements around the third r-process abundance peak. A: International Symposium on Nuclei in the Cosmos. "Proceedings of Science". Cairns: 2012, p. 1-6.