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HK: Fachverband Physik der Hadronen und Kerne
HK 47: Nuclear Astrophysics I
HK 47.6: Vortrag
Donnerstag, 2. April 2020, 15:30–15:45, J-HS B
The role of fission yields in the r-process — •Bowen Jiang1,2, Gabriel Martínez-Pinedo1,2, and Bastian Schütrumpf1 — 1GSI — 2Technische Universität Darmstadt
The r-process nucleosynthesis in neutron star mergers may reach fissionable nuclei, which generates significant uncertainties in predicting of the final abundance of r-process materials. We demonstrate that in cases where fission happens, it will have an essential impact on the abundance pattern around the second r-process peak (A∼ 130) as well as the lanthanides regime (A=135∼ 160).
Our calculations also show that fission only accounts for modifying abundance ratios among materials in the first several seconds. Fission yields of the nuclei fissioning in this time span could impact the number of free neutrons in the environment as well.
We evaluate the impact of fission yields by using two versions of a semi-empirical fission model called GEF. Large uncertainties of the prediction provided by the GEF model on neutron-rich fissionable nuclei are shown. We also discuss how improvement could be made in the GEF model to cover physical effects in exodic nuclei, by new experimental data of fission yields on a single nuclei, i.e. 258Fm and 252Cf.