IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Systematic calculation of neutrino-nucleus cross section available for astrophysical applications
Autor/es:
SAMANA A.R.; C. BARBERO; M. CASSIANO DOS SANTOS
Revista:
BRAZILIAN JOURNAL OF PHYSICS
Editorial:
SOC BRASILEIRA FISICA
Referencias:
Lugar: SAN PABLO; Año: 2020 vol. 50 p. 331 - 345
ISSN:
0103-9733
Resumen:
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 < 220for 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.