Approaching the precursor nuclei of the third r-process peak with RIBs
Tipus de documentComunicació de congrés
EditorInstitute of Physics (IOP)
Condicions d'accésAccés obert
The rapid neutron nucleosynthesis process involves an enormous amount of very exotic neutron-rich nuclei, which represent a theoretical and experimental challenge. Two of the main decay properties that affect the final abundance distribution the most are half-lives and neutron branching ratios. Using fragmentation of a primary 238U beam at GSI we were able to measure such properties for several neutron-rich nuclei from 208Hg to 218Pb. This contribution provides a short update on the status of the data analysis of this experiment, together with a compilation of the latest results published in this mass region, both experimental and theoretical. The impact of the uncertainties connected with the eta-decay rates and with beta-delayed neutron emission is illustrated on the basis of r-process network calculations. In order to obtain a reasonable reproduction of the third r-process peak, it is expected that both half-lives and neutron branching ratios are substantially smaller, than those based on FRDM+QRPA, commonly used in r-process model calculations. Further measurements around N 126 are required for a reliable modelling of the underlying nuclear structure, and for performing more realistic r-process abundance calculations.
CitacióDomingo-Pardo, C., Agramunt, J., Algora, A., Calviño, F., Cortes, G. Approaching the precursor nuclei of the third r-process peak with RIBs. A: Nuclear Physics in Astrophysics. "Journal of Physics: Conference Series, vol. 665, no. 1, January 5, 2016". Lisboa: Institute of Physics (IOP), 2013, p. 1-8.