dorsal/arxiv
View SchemaNeutrino-induced neutron spallation and supernova r-process nucleosynthesis
| Authors | Y. -Z. Qian, W. C. Haxton, K. Langanke, P. Vogel |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9611010 |
| URL | https://arxiv.org/abs/nucl-th/9611010 |
| DOI | 10.1103/PhysRevC.55.1532 |
| Journal | Phys.Rev.C55:1532-1544,1997 |
Abstract
In order to explore the consequences of the neutrino irradiation for the supernova r-process nucleosynthesis, we calculate the rates of charged-current and neutral-current neutrino reactions on neutron-rich heavy nuclei, and estimate the average number of neutrons emitted in the resulting spallation. Our results suggest that charged-current $\nu_e$ captures can be important in breaking through the waiting-point nuclei at N=50 and 82, while still allowing the formation of abundance peaks. Furthermore, after the r-process freezes out, there appear to be distinctive neutral-current and charged-current postprocessing effects. A subtraction of the neutrino postprocessing effects from the observed solar r-process abundance distribution shows that two mass regions, A=124-126 and 183-187, are inordinately sensitive to neutrino postprocessing effects. This imposes very stringent bounds on the freeze-out radii and dynamic timescales governing the r-process. Moreover, we find that the abundance patterns within these mass windows are entirely consistent with synthesis by neutrino interactions. This provides a strong argument that the r-process must occur in the intense neutrino flux provided by a core-collapse supernova.
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"abstract": "In order to explore the consequences of the neutrino irradiation for the\nsupernova r-process nucleosynthesis, we calculate the rates of charged-current\nand neutral-current neutrino reactions on neutron-rich heavy nuclei, and\nestimate the average number of neutrons emitted in the resulting spallation.\nOur results suggest that charged-current $\\nu_e$ captures can be important in\nbreaking through the waiting-point nuclei at N=50 and 82, while still allowing\nthe formation of abundance peaks. Furthermore, after the r-process freezes out,\nthere appear to be distinctive neutral-current and charged-current\npostprocessing effects. A subtraction of the neutrino postprocessing effects\nfrom the observed solar r-process abundance distribution shows that two mass\nregions, A=124-126 and 183-187, are inordinately sensitive to neutrino\npostprocessing effects. This imposes very stringent bounds on the freeze-out\nradii and dynamic timescales governing the r-process. Moreover, we find that\nthe abundance patterns within these mass windows are entirely consistent with\nsynthesis by neutrino interactions. This provides a strong argument that the\nr-process must occur in the intense neutrino flux provided by a core-collapse\nsupernova.",
"arxiv_id": "nucl-th/9611010",
"authors": [
"Y. -Z. Qian",
"W. C. Haxton",
"K. Langanke",
"P. Vogel"
],
"categories": [
"nucl-th",
"astro-ph"
],
"doi": "10.1103/PhysRevC.55.1532",
"journal_ref": "Phys.Rev.C55:1532-1544,1997",
"title": "Neutrino-induced neutron spallation and supernova r-process nucleosynthesis",
"url": "https://arxiv.org/abs/nucl-th/9611010"
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