Systematic Calculation of Neutrino–Nucleus Cross Section Available for Astrophysical Applications
Assuming the universality of weak interactions, we have studied the weak processes such as β-decay and electron capture using the nuclear gross theory of beta decay (GTBD). We evaluate the β± and electron capture decay rates and the neutrino–nucleus cross sections as a function of the energy of the...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2020 |
| País: | Argentina |
| Institución: | Universidad Nacional de La Plata |
| Repositorio: | SEDICI (UNLP) |
| Idioma: | inglés |
| OAI Identifier: | oai:sedici.unlp.edu.ar:10915/146224 |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/146224 |
| Access Level: | acceso abierto |
| Palabra clave: | Física β-decay Electron capture Neutrino–nucleus cross section Gross theory of beta decay |
| Sumario: | Assuming the universality of weak interactions, we have studied the weak processes such as β-decay and electron capture using the nuclear gross theory of beta decay (GTBD). We evaluate the β± and electron capture decay rates and the neutrino–nucleus cross sections as a function of the energy of the incident neutrino, for Eν < 250 MeV. The evaluation performed some years ago for the electron neutrino–nucleus reactions in the mass region A < 70 is extended to the heavy one A < 220 for a set of 965 nuclear species of astrophysical interest. The nuclei are separated according to its parity in even–even, even–odd, odd–odd, and odd–even nuclei, both for β±-decay and electron capture. The obtained cross sections are interpolated by means of a fourth-degree polynomial function in Eν. The coefficients in these polynomials are obtained and later fitted as a function of A and Z. The fitting procedure is described in detail paying special attention to the root mean square deviations in the adjustment. These polynomial functions provide a tool for the systematic evaluation of the cross sections needed in astrophysical processes like the r-process during the nucleosynthesis of supernovae. |
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