Structure of the Gamow-Teller resonance in 58Cu studied via the proton-and γ-decay measurements

Abstract

The Gamow-Teller (GT) states in 58Cu have been studied by 58Ni(3He, t + p) and 58Ni(3He, t + γ) coincidence experiments at E(3He)=450 MeV and θ=0°. Proton emissions from the GT states in 58Cu to the hole states in 57Ni have been observed with solid-state detectors in coincidence with high-energy tritons measured with a magnetic spectrometer. For the first time, γ-ray emissions from the excited states in 58Cu and in 57Ni, following the 58Ni(3He, t + p) reaction at intermediate energies, have also been observed in coincidence with tritons. The wave functions of the T=1 and T=2 GT states with the f72/−1 neutron-hole configuration are inferred to be strongly coupled to 2p-2h configurations, making fragmented GT strengths in 58Cu.