Stellar β−-decay Rate of 63Ni and Its Impact on the s-process Nucleosynthesis in Massive Stars
The β ^− -decay rate of ^63 Ni, an important branching point, affects the subsequent nucleosynthesis in the weak component of the slow-neutron capture process (weak s -process). To evaluate the impact of the uncertainties of stellar lifetime of ^63 Ni on abundances, we calculate the contribution to...
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2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-4357/adc1be |
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| author | Xin-Xu Wang Bao-Hua Sun Toshitaka Kajino Zhen-Yu He Toshio Suzuki Dong-Liang Fang Zhong-Ming Niu |
| author_facet | Xin-Xu Wang Bao-Hua Sun Toshitaka Kajino Zhen-Yu He Toshio Suzuki Dong-Liang Fang Zhong-Ming Niu |
| author_sort | Xin-Xu Wang |
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| description | The β ^− -decay rate of ^63 Ni, an important branching point, affects the subsequent nucleosynthesis in the weak component of the slow-neutron capture process (weak s -process). To evaluate the impact of the uncertainties of stellar lifetime of ^63 Ni on abundances, we calculate the contribution to β ^− -decay rates from its excited states using the large-scale shell model with various interactions and also explore the atomic effects in the highly ionized plasma. In the core He burning stage and the shell C burning stage of massive stars, our new rates can be larger than those from K. Takahashi & K. Yokoi by up to a factor of 4 and 6, respectively. We evaluate the impact of the stellar decay rates of ^63 Ni on the nucleosynthesis of A = 60 ∼ 90 in a star with an initial mass of 25 M _⊙ and solar metallicity. We find that the new rates can lead to abundance changes of ^64 Ni, ^63 Cu, ^65 Cu, ^64 Zn, ^66 Zn, ^67 Zn, and ^68 Zn by up to 18%, 14%, 7%, 98%, 16%, 15%, and 13%, respectively, after the shell C burning stage at the Lagrangian mass coordinate M _r = 2 M _⊙ . The enhancement of the decay rate of ^63 Ni increases the weak s -process efficiency of nuclei after ^65 Cu. |
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| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| spelling | doaj-art-263ac1c7bb1b4ef189304d737233dcfa2025-08-20T02:07:16ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-019841810.3847/1538-4357/adc1beStellar β−-decay Rate of 63Ni and Its Impact on the s-process Nucleosynthesis in Massive StarsXin-Xu Wang0https://orcid.org/0009-0003-9008-3590Bao-Hua Sun1https://orcid.org/0000-0001-9868-5711Toshitaka Kajino2https://orcid.org/0000-0003-1856-4173Zhen-Yu He3https://orcid.org/0009-0002-0124-9492Toshio Suzuki4https://orcid.org/0000-0002-5500-539XDong-Liang Fang5Zhong-Ming Niu6https://orcid.org/0000-0002-4068-8247School of Physics, Beihang University , Beijing 100191, People’s Republic of China ; bhsun@buaa.edu.cnSchool of Physics, Beihang University , Beijing 100191, People’s Republic of China ; bhsun@buaa.edu.cnSchool of Physics, Peng Huanwu Collaborative Center for Research and Education, International Research Center for Big-Bang Cosmology and Element Genesis, Beihang University , Beijing 100191, People’s Republic of China ; kajino@buaa.edu.cn; National Astronomical Observatory of Japan , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan; Graduate School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, JapanSchool of Physics, Peng Huanwu Collaborative Center for Research and Education, International Research Center for Big-Bang Cosmology and Element Genesis, Beihang University , Beijing 100191, People’s Republic of China ; kajino@buaa.edu.cnDepartment of Physics, College of Humanities and Sciences, Nihon University , 3-25-40 Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan; NAT Research Center , NAT Corporation, 3129-45 Hibara Muramatsu, Tokai-mura, Naka-gun, Ibaraki 319-1112, JapanInstitute of Modern Physics , Chinese Academy of Sciences, Lanzhou 730000, People’s Republic of ChinaSchool of Physics and Optoelectronic Engineering, Anhui University , Hefei 230601, People’s Republic of ChinaThe β ^− -decay rate of ^63 Ni, an important branching point, affects the subsequent nucleosynthesis in the weak component of the slow-neutron capture process (weak s -process). To evaluate the impact of the uncertainties of stellar lifetime of ^63 Ni on abundances, we calculate the contribution to β ^− -decay rates from its excited states using the large-scale shell model with various interactions and also explore the atomic effects in the highly ionized plasma. In the core He burning stage and the shell C burning stage of massive stars, our new rates can be larger than those from K. Takahashi & K. Yokoi by up to a factor of 4 and 6, respectively. We evaluate the impact of the stellar decay rates of ^63 Ni on the nucleosynthesis of A = 60 ∼ 90 in a star with an initial mass of 25 M _⊙ and solar metallicity. We find that the new rates can lead to abundance changes of ^64 Ni, ^63 Cu, ^65 Cu, ^64 Zn, ^66 Zn, ^67 Zn, and ^68 Zn by up to 18%, 14%, 7%, 98%, 16%, 15%, and 13%, respectively, after the shell C burning stage at the Lagrangian mass coordinate M _r = 2 M _⊙ . The enhancement of the decay rate of ^63 Ni increases the weak s -process efficiency of nuclei after ^65 Cu.https://doi.org/10.3847/1538-4357/adc1beNucleosynthesisHelium burningCarbon burningMassive starsS-process |
| spellingShingle | Xin-Xu Wang Bao-Hua Sun Toshitaka Kajino Zhen-Yu He Toshio Suzuki Dong-Liang Fang Zhong-Ming Niu Stellar β−-decay Rate of 63Ni and Its Impact on the s-process Nucleosynthesis in Massive Stars The Astrophysical Journal Nucleosynthesis Helium burning Carbon burning Massive stars S-process |
| title | Stellar β−-decay Rate of 63Ni and Its Impact on the s-process Nucleosynthesis in Massive Stars |
| title_full | Stellar β−-decay Rate of 63Ni and Its Impact on the s-process Nucleosynthesis in Massive Stars |
| title_fullStr | Stellar β−-decay Rate of 63Ni and Its Impact on the s-process Nucleosynthesis in Massive Stars |
| title_full_unstemmed | Stellar β−-decay Rate of 63Ni and Its Impact on the s-process Nucleosynthesis in Massive Stars |
| title_short | Stellar β−-decay Rate of 63Ni and Its Impact on the s-process Nucleosynthesis in Massive Stars |
| title_sort | stellar β decay rate of 63ni and its impact on the s process nucleosynthesis in massive stars |
| topic | Nucleosynthesis Helium burning Carbon burning Massive stars S-process |
| url | https://doi.org/10.3847/1538-4357/adc1be |
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