Excitation of Gamow-Teller resonances in A=58 nuclei

Abstract

The 58Ni(p,n) 58Cu reaction has been studied at 120 MeV and 160 MeV incident energies. States in 58Cu with Gamow-Teller (GT) strength, identified by its L=0 angular distribution, have been observed up to an excitation energy of ∼14 MeV. The excitation of a broad resonance at ∼9 MeV excitation is identified as the main T=1 component of the GT strength in 58Cu. Comparison with shell model calculations using an fp model space indicates that the GT strength cannot be clearly resolved in terms of its T=0, 1 and 2 components. We find that the sum of the experimentally observed GT strength is ∼55% of the theoretically predicted value. Comparison is made with published M1 results from the 58Ni(e,e′) reaction.