Speaker
Description
For the BRIKEN, RIBF207-ZDMRTOF collaboration
In the stellar rapid ($r$-) neutron-capture process nucleosynthesis, successive neutron-capture reactions under a large neutron-density environment push the matter toward the neutron-rich side until the beta-decay processes compete and heavier elements are formed. When neutron ceases, matters along the $r$-process path beta-decay to stability, yielding final $r$-process abundance pattern observed in the metal-poor stars [1] and the solar system [2]. Such a complex nuclear reaction network involves many neutron-rich nuclei whose properties such as nuclear masses, $\beta$-decay half-lives, $\beta$-delayed neutron emission probabilities play important roles in connecting the elemental distribution with the astrophysical conditions [3].
$\beta$-decay properties and masses of very neutron-rich nuclei are among the subjects of several exprimental programs at RIKEN Radioactive Isotope Beam Facility (RIBF) [4, 5, 6] where the obtained data span across nuclear regions relevant to the prominent $r$-process peaks. In this talk, recent experimental results [7, 8, 9, 10] and the planned programs will be highlighted.
[1] I. U. Roederer et al., Astrophys. J. Suppl. Ser. 260, 27 (2022).
[2] C. Sneden, J. J. Cowan, and R. Gallino, Annu. Rev. Astron. Astrophys. 46, 241 (2008).
[3] M. R. Mumpower, R. Surman, G. McLaughlin, A. Aprahamian, Prog. Part. Nucl. Phys. 86 (2016).
[4] I. Dillmann and A. Tarifeño-Saldivia, Nucl. Phys. News 28, 28 (2018).
[5] S. Nishimura, Prog. Theo. Exp. Phys. 2012, 03C006 (2012).
[6] M. Rosenbusch et al., arXiv preprint arXiv:2110.11507 (2021).
[7] R. Yokoyama et al., Phys. Rev. C 100, 031302(R) (2019).
[8] O. Hall et al., Phys. Lett. B 816, 136266 (2021).
[9] V. H. Phong et al., Phys. Rev. C 100, 011302 (2019).
[10] V. H. Phong et al., Phys. Rev. Lett. 129, 172701 (2022)
| Please select a main topic related to your abstract | Explosive Stellar Objects and Nuclear Physics |
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