Gamow-Teller Strength Distributions in Sc48 by the Ca48(p,n) and Ti48(n,p) Reactions and Two-Neutrino Double-β Decay Nuclear Matrix Elements

K. Yako et al.
Phys. Rev. Lett. 103, 012503 – Published 1 July 2009

Abstract

The double-differential cross sections for the Ca48(p,n) and Ti48(n,p) reactions were measured at 300 MeV. A multipole decomposition technique was applied to the spectra to extract the Gamow-Teller (GT) components. The integrated GT strengths up to an excitation energy of 30 MeV in Sc48 are 15.3±2.2 and 2.8±0.3 in the (p,n) and (n,p) spectra, respectively. In the (n,p) spectra additional GT strengths were found above 8 MeV where shell models within the fp shell-model space predict almost no GT strengths, suggesting that the present shell-model description of the nuclear matrix element of the two-neutrino double-β decay is incomplete.

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  • Received 25 March 2009

DOI:https://doi.org/10.1103/PhysRevLett.103.012503

©2009 American Physical Society

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Vol. 103, Iss. 1 — 3 July 2009

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