Abstract
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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Acknowledgments
C.B. is fellow of the CONICET, CCT La Plata (Argentina). A.R.S. acknowledges the financial support of FAPESB (Fundaçâo de Amparo à Pesquisa do Estado Bahia) TERMO DE OUTORGA PIE0013/2016. The authors thank the partial support of UESC (PROPP 00220.1300.1832).
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Barbero, C.A., dos Santos, M.C. & Samana, A.R. Systematic Calculation of Neutrino–Nucleus Cross Section Available for Astrophysical Applications. Braz J Phys 50, 331–345 (2020). https://doi.org/10.1007/s13538-020-00737-y
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DOI: https://doi.org/10.1007/s13538-020-00737-y