Effects of Hoyle state de-excitation on νp–process nucleosynthesis and Galactic chemical evolution
Abstract
The particle-induced hadronic de-excitation of the Hoyle state in 12C induced by inelastic scattering in a hot and dense plasma can enhance the triple-alpha reaction rate. This prevents the production of heavy nuclei within the neutrino-driven winds of core-collapse supernovae and raises a question as to the contribution of proton-rich neutrino-driven winds as the origin of p–nuclei in the solar-system abundances. Here we study νp-process nucleosynthesis in proton-rich neutrino-driven winds relevant to the production of 92,94Mo and 96,98Ru by considering such particle-induced de-excitation. We find that the enhanced triple-alpha reaction rate induced by proton inelastic scattering can increase the production of 92,94Mo and 96,98Ru in an energetic hypernova wind model with a massive proto-neutron star although the abundances of these p–nuclei decrease in a wind model of ordinary core-collapse supernovae. The enhancement of the triple-alpha reaction rate induced by the neutron scattering hardly affects the νp-process at low temperature. We show the new result that, contrary to the results for ordinary core-collapse supernovae, the hypernova νp-process can contribute to the Galactic chemical evolution of p–nuclei regardless of the particle-induced Hoyle state de-excitation and even enhance the solar isotopic fractions of 92,94Mo and 96,98Ru. .
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); University of Notre Dame, IN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); Japan Society for the Promotion of Science (JSPS); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC)
- OSTI Identifier:
- 2331366
- Alternate Identifier(s):
- OSTI ID: 2329250
- Report Number(s):
- LA-UR-23-27158
Journal ID: ISSN 0370-2693; S0370269324001394; 138581; PII: S0370269324001394
- Grant/Contract Number:
- FG02-95-ER40934; 89233218CNA000001; 19J13632, 21J11453; 2022YFA1602401; 12335009; 20K03958
- Resource Type:
- Published Article
- Journal Name:
- Physics Letters. B
- Additional Journal Information:
- Journal Name: Physics Letters. B Journal Volume: 851 Journal Issue: C; Journal ID: ISSN 0370-2693
- Publisher:
- Elsevier
- Country of Publication:
- Netherlands
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS; 79 ASTRONOMY AND ASTROPHYSICS; explosive nucleosynthesis; hypernovae; galaxy chemical evolution; galactic abundances
Citation Formats
Sasaki, Hirokazu, Yamazaki, Yuta, Kajino, Toshitaka, and Mathews, Grant J. Effects of Hoyle state de-excitation on νp–process nucleosynthesis and Galactic chemical evolution. Netherlands: N. p., 2024.
Web. doi:10.1016/j.physletb.2024.138581.
Sasaki, Hirokazu, Yamazaki, Yuta, Kajino, Toshitaka, & Mathews, Grant J. Effects of Hoyle state de-excitation on νp–process nucleosynthesis and Galactic chemical evolution. Netherlands. https://doi.org/10.1016/j.physletb.2024.138581
Sasaki, Hirokazu, Yamazaki, Yuta, Kajino, Toshitaka, and Mathews, Grant J. Mon .
"Effects of Hoyle state de-excitation on νp–process nucleosynthesis and Galactic chemical evolution". Netherlands. https://doi.org/10.1016/j.physletb.2024.138581.
@article{osti_2331366,
title = {Effects of Hoyle state de-excitation on νp–process nucleosynthesis and Galactic chemical evolution},
author = {Sasaki, Hirokazu and Yamazaki, Yuta and Kajino, Toshitaka and Mathews, Grant J.},
abstractNote = {The particle-induced hadronic de-excitation of the Hoyle state in 12C induced by inelastic scattering in a hot and dense plasma can enhance the triple-alpha reaction rate. This prevents the production of heavy nuclei within the neutrino-driven winds of core-collapse supernovae and raises a question as to the contribution of proton-rich neutrino-driven winds as the origin of p–nuclei in the solar-system abundances. Here we study νp-process nucleosynthesis in proton-rich neutrino-driven winds relevant to the production of 92,94Mo and 96,98Ru by considering such particle-induced de-excitation. We find that the enhanced triple-alpha reaction rate induced by proton inelastic scattering can increase the production of 92,94Mo and 96,98Ru in an energetic hypernova wind model with a massive proto-neutron star although the abundances of these p–nuclei decrease in a wind model of ordinary core-collapse supernovae. The enhancement of the triple-alpha reaction rate induced by the neutron scattering hardly affects the νp-process at low temperature. We show the new result that, contrary to the results for ordinary core-collapse supernovae, the hypernova νp-process can contribute to the Galactic chemical evolution of p–nuclei regardless of the particle-induced Hoyle state de-excitation and even enhance the solar isotopic fractions of 92,94Mo and 96,98Ru. .},
doi = {10.1016/j.physletb.2024.138581},
journal = {Physics Letters. B},
number = C,
volume = 851,
place = {Netherlands},
year = {Mon Apr 01 00:00:00 EDT 2024},
month = {Mon Apr 01 00:00:00 EDT 2024}
}
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