Large discrepancies have been reported between the Gamow-Teller strengths determined from Ca P-delayed proton decay, and the isospin-analog strengths deduced from "Cl(p, n) studies. Some of these discrepancies could be removed if the Ca daughter level at 3.24 MeV in K had I'~forty times bigger than its I'", and not negligibly small as assumed in the initial analysis of the Ca P decay. We studied proton and p-ray branching ratios of low-lying K levels populated via the Ca(p, o) reaction. We find that the 3.24 MeV level has I~/1"")8, and that the 2.75 and 3.08 MeV levels have I'~/ I'"= 0.52 + 0.23 and I'~/I'"= 0.41 6 0.014, respectively. In addition we identified new K levels at E = 3.272 + 0.002 and 2.967 + 0.002 MeV. PACS number(s): 23.20.Lv, 21.10.Hw, 27.30.+t The reduced Gamow-Teller transition strength B(GT) for neutrino capture on Cl into a given state in Ar should be equal to the corresponding B(GT) for Ca P decay to the analog level in K if isospin is a valid symmetry. Several surprising difFerences [1] have been observed in the Cai K* B(GT)'s measured by Pdelayed proton emission [2] and the Cl~A r* B(GT)'s deduced from intermediate-energy zero-degree Cl(p, n) cross sections [3]. In particular, the Ca -+ K transition to the second 5/2+ excited state at E =3.24 MeV was reported to be forty times weaker than the strength assigned to the Ar analog level at E =3.17 MeV in
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.