par Goriely, Stéphane 
Référence European Physical Journal A. Hadrons and nuclei, 51, page (22)
Publication Publié, 2015-02-12
Référence European Physical Journal A. Hadrons and nuclei, 51, page (22)
Publication Publié, 2015-02-12
Compte rendu
| Résumé : | The rapid neutron-capture process, or r-process, is known to be of fundamental importancefor explaining the origin of approximately half of the A > 60 stable nuclei observed in nature. Despiteimportant efforts, the astrophysical site of the r-process remains unidentified. Here we study r-processnucleosynthesis in a material that is dynamically ejected by tidal and pressure forces during the merging ofbinary neutron stars. r-process nucleosynthesis during the decompression is known to be largely insensitiveto the detailed astrophysical conditions because of efficient fission recycling, producing a composition thatclosely follows the solar r-abundance distribution for nuclei with mass numbers A > 140. Due to theimportant role played by fission in such a scenario, the impact of fission is carefully analyzed. We considerdifferent state-of-the-art global models for the determination of the fission paths, nuclear level densitiesat the fission saddle points and fission fragment distributions. Based on such models, the sensitivity ofthe calculated r-process abundance distribution is studied. The fission path is found to strongly affect theregion of heavy nuclei responsible for the fission recycling, while the fission fragment distribution of nucleialong the A ~278 isobars defines the abundance pattern of nuclei produced in the 110 |
