Production of $p$-nuclei from $r$-process seeds: the $νr$-process
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| Main Authors: | , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866913347189866496 |
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| author | Xiong, Zewei Martínez-Pinedo, Gabriel Just, Oliver Sieverding, Andre |
| author_facet | Xiong, Zewei Martínez-Pinedo, Gabriel Just, Oliver Sieverding, Andre |
| contents | We present a new nucleosynthesis process that may take place on neutron-rich ejecta experiencing an intensive neutrino flux. The nucleosynthesis proceeds similarly to the standard $r$-process, a sequence of neutron-captures and beta-decays, however with charged-current neutrino absorption reactions on nuclei operating much faster than beta-decays. Once neutron capture reactions freeze-out the produced $r$-process neutron-rich nuclei undergo a fast conversion of neutrons into protons and are pushed even beyond the $β$-stability line producing the neutron-deficient $p$-nuclei. This scenario, which we denote as the $νr$-process, provides an alternative channel for the production of $p$-nuclei and the short-lived nucleus $^{92}$Nb. We discuss the necessary conditions posed on the astrophysical site for the $νr$-process to be realized in nature. While these conditions are not fulfilled by current neutrino-hydrodynamic models of $r$-process sites, future models, including more complex physics and a larger variety of outflow conditions, may achieve the necessary conditions in some regions of the ejecta. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2305_11050 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Production of $p$-nuclei from $r$-process seeds: the $νr$-process Xiong, Zewei Martínez-Pinedo, Gabriel Just, Oliver Sieverding, Andre High Energy Astrophysical Phenomena Nuclear Experiment Nuclear Theory We present a new nucleosynthesis process that may take place on neutron-rich ejecta experiencing an intensive neutrino flux. The nucleosynthesis proceeds similarly to the standard $r$-process, a sequence of neutron-captures and beta-decays, however with charged-current neutrino absorption reactions on nuclei operating much faster than beta-decays. Once neutron capture reactions freeze-out the produced $r$-process neutron-rich nuclei undergo a fast conversion of neutrons into protons and are pushed even beyond the $β$-stability line producing the neutron-deficient $p$-nuclei. This scenario, which we denote as the $νr$-process, provides an alternative channel for the production of $p$-nuclei and the short-lived nucleus $^{92}$Nb. We discuss the necessary conditions posed on the astrophysical site for the $νr$-process to be realized in nature. While these conditions are not fulfilled by current neutrino-hydrodynamic models of $r$-process sites, future models, including more complex physics and a larger variety of outflow conditions, may achieve the necessary conditions in some regions of the ejecta. |
| title | Production of $p$-nuclei from $r$-process seeds: the $νr$-process |
| topic | High Energy Astrophysical Phenomena Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2305.11050 |