Electron capture strength forNi60,62andNi58,

Abstract

Background:The strength of electron capture for medium mass nuclei has a significant effect on the evolution of supernovae. There is insufficient knowledge of these strengths and very little data for important radioactive nuclei. Purpose: Determine whether it is feasible to obtain EC strength from studies of T o + 1 excitations in (p, n) reactions, and whether this might yield information for radioactive nuclei. Methods: Cross sections for the 58,60,62,64 Ni(p, n) 58,60,62,64 Cu reactions were measured over the angular range of 0.3 • to 11.6 • at 134.3 MeV using the IUCF neutron time-of-flight facility. Results: The T o + 1 excitations in 60,62 Ni were identified by comparison with inelastic proton scattering spectra, their B(GT) were extracted, and the corresponding electron capture rates in supernovae were calculated. Data from the TRIUMF (n, p) experiments at 198 MeV were reanalyzed; the electron capture rates for the reanalyzed data are in moderately good agreement with the higher resolution (p, n) results, but differ in detail. The possibility of future measurements with radioactive nuclei was considered. Conclusions: It may be possible to obtain low-lying electron capture strength for radioactive nuclei by studying (p, n) reactions in inverse kinematics.

Stellar electron-capture rates on nuclei based on a microscopic Skyrme functional

“…It would be very interesting to compare the capture rates derived in this framework with those inferred from experimental measurements of the GT strength (see, e.g., Refs. [34][35][36]). This will be considered in a future work.…”

Extraction of Gamow-Teller strength distributions from56Ni and55Co via the(p,n)Sasano1, Perdikakis2, Zegers3 et al. 2012Phys. Rev. CSelf Cite431230View full textAdd to dashboardCite

“…Similarly, GT strengths extracted for the 55 Co→ 55 Ni transitions also provide information for GT strengths associated with transitions from 55 Ni to 55 Co. The method of extracting GT strengths in the β + /EC direction from ∆T z = −1, (p,n) data has been used successfully in the past for stable Ni isotopes [28].…”

Stellar electron-capture rates on nuclei based on Skyrme functionals

“…19, 21, 22 in Ref. [8]), as well as the rates obtained from the experimental GT distributions extracted from (n, p) reactions [16][17][18] (taken from Figs. 16, 20, 22 in Ref.…”