Electron Capture Cross Sections for Stellar Nucleosynthesis

Abstract

In the first stage of this work, we perform detailed calculations for the cross sections of the electron capture on nuclei under laboratory conditions. Towards this aim we exploit the advantages of a refined version of the proton-neutron quasi-particle random-phase approximation (pn-QRPA) and carry out state-by-state evaluations of the rates of exclusive processes that lead to any of the accessible transitions within the chosen model space. In the second stage of our present study, we translate the above mentioned e − -capture cross sections to the stellar environment ones by inserting the temperature dependence through a Maxwell-Boltzmann distribution describing the stellar electron gas. As a concrete nuclear target we use the 66 Zn isotope, which belongs to the iron group nuclei and plays prominent role in stellar nucleosynthesis at core collapse supernovae environment.

Probing light sterile neutrino signatures at reactor and Spallation Neutron Source neutrino experiments

“…The hadronic matrix element is obtained through a multipole decomposition as described in Refs. [74,75]. Then, the differential cross section with respect to the scattering angle θ, for the CEνNS (gs → gs transitions) off a spherical spin-zero nucleus, reads [5,69] dσ…”

Sensitivities to neutrino electromagnetic properties at the TEXONO experiment

“…From a nuclear theory point of view, the reliability of the present CENNS cross sections calculations is maximised in terms of accuracy by performing nuclear structure calculations in the context of QRPA [52,53]. Motivated by its successful application on similar calculations for various semi-leptonic nuclear processes [54,55], in this work we construct explicitly the nuclear ground state, |gs ≡ |0 + , of the relevant even-even isotope through the solution of the BCS equations (for a detailed description see Ref. [23]).…”

Impact of Nonstandard Interactions on Neutrino-Nucleon Scattering

“…Historically, nucleons and nuclear systems have been extensively employed [59,60] as microlaboratories for exploring open neutrino properties through charged- [61] and neutral-current interaction processes [62]. The latter involve both the vector and the axial vector components of the weak interactions [63,64]. Thus, such probes are helpful for investigating the fundamental interactions of neutrinos with other elementary particles at low, intermediate and high energies [65].…”