Ab initio calculations of beta-decay half-lives for $N=50$ neutron-rich nuclei
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| Format: | Preprint |
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2025
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| _version_ | 1866915990168666112 |
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| author | Li, Zhen Miyagi, Takayuki Schwenk, Achim |
| author_facet | Li, Zhen Miyagi, Takayuki Schwenk, Achim |
| contents | Beta-decay rates of extreme neutron-rich nuclei remain largely unknown experimentally, while they are critical inputs for $r$-process nucleosynthesis. We present first ab initio calculations of total beta-decay half-lives, with a focus on $N=50$ nuclei. Starting from nuclear forces and currents based on chiral effective field theory, we use the in-medium similarity renormalization group to consistently derive valence-space Hamiltonians and weak operators, from which we calculate the nuclear states involved and the Gamow-Teller transition strengths, without phenomenological adjustments. In addition, we explore effects of first-forbidden contributions. Our results show that the inclusion of two-body currents increases the total half-lives, which then show good agreement with the existing experimental data, thereby validating the predictive capability of our approach. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_06812 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ab initio calculations of beta-decay half-lives for $N=50$ neutron-rich nuclei Li, Zhen Miyagi, Takayuki Schwenk, Achim Nuclear Theory High Energy Astrophysical Phenomena Nuclear Experiment Beta-decay rates of extreme neutron-rich nuclei remain largely unknown experimentally, while they are critical inputs for $r$-process nucleosynthesis. We present first ab initio calculations of total beta-decay half-lives, with a focus on $N=50$ nuclei. Starting from nuclear forces and currents based on chiral effective field theory, we use the in-medium similarity renormalization group to consistently derive valence-space Hamiltonians and weak operators, from which we calculate the nuclear states involved and the Gamow-Teller transition strengths, without phenomenological adjustments. In addition, we explore effects of first-forbidden contributions. Our results show that the inclusion of two-body currents increases the total half-lives, which then show good agreement with the existing experimental data, thereby validating the predictive capability of our approach. |
| title | Ab initio calculations of beta-decay half-lives for $N=50$ neutron-rich nuclei |
| topic | Nuclear Theory High Energy Astrophysical Phenomena Nuclear Experiment |
| url | https://arxiv.org/abs/2509.06812 |