Publication:
Beta-decay half-lives of the extremely neutron-rich nuclei in the closed-shell N = 50, 82, 126 groups
Beta-decay half-lives of the extremely neutron-rich nuclei in the closed-shell N = 50, 82, 126 groups
| datacite.subject.fos | oecd::Natural sciences | |
| dc.contributor.author | Nguyen Kim Uyen | |
| dc.contributor.author | Kyung Yuk Chae | |
| dc.contributor.author | Nguyen Ngoc Duy | |
| dc.contributor.author | Nguyen Duy Ly | |
| dc.date.accessioned | 2022-11-09T09:03:23Z | |
| dc.date.available | 2022-11-09T09:03:23Z | |
| dc.date.issued | 2021 | |
| dc.description.abstract | The β−-decay half-lives of extremely neutron-rich nuclei are important for understanding nucleosynthesis in the rapid neutron capture process (r-process). However, most of their half-lives are unknown or very uncertain, leading to the need for reliable calculations. In this study, we updated the coefficients in recent semi-empirical formulae using the newly updated mass (AME2020) and half-life (NUBASE2020) databases to improve the accuracy of the half-life prediction. In particular, we developed a new empirical model for better calculations of the β−-decay half-lives of isotopes ranging in Z = 10–80 and N = 15–130. We examined the β−-decay half-lives of the extremely neutron-rich isotopes at and around the neutron magic numbers of N = 50, 82, and 126 using either five different semi-empirical models or finite-range droplet model and quasi-particle random phase approximation method. The β−-decay rates derived from the estimated half-lives were used in calculations to evaluate the impact of the half-life uncertainties of the investigated nuclei on the abundance of the r-process. The results show that the half-lives mostly range in 0.001 < T1/2 < 100 s for the nuclei with a ratio of N/Z < 1.9; however, they differ significantly for those with the ratio of N/Z > 1.9. The half-life differences among the models were found to range from a few factors (for N/Z < 1.9 nuclei) to four orders of magnitude (for N/Z > 1.9). These discrepancies lead to a large uncertainty, which is up to four orders of magnitude, in the r-process abundance of isotopes. We also found that the multiple-reflection time-of-flight technique is preferable for precise mass measurements because its measuring timescale applies to the half-lives of the investigated nuclei. Finally, the results of this study are useful for studies on the β-decay of unstable isotopes and astrophysical simulations. | |
| dc.identifier.doi | 10.1088/1361-6471/ac3cfa | |
| dc.identifier.uri | http://repository.vlu.edu.vn:443/handle/123456789/1087 | |
| dc.language.iso | en_US | |
| dc.relation.ispartof | Journal of Physics G: Nuclear and Particle Physics | |
| dc.relation.issn | 0954-3899 | |
| dc.relation.issn | 1361-6471 | |
| dc.title | Beta-decay half-lives of the extremely neutron-rich nuclei in the closed-shell N = 50, 82, 126 groups | |
| dc.type | journal-article | |
| dspace.entity.type | Publication | |
| oaire.citation.issue | 2 | |
| oaire.citation.volume | 49 |