Gamow–Teller transitions in the 64Ni(3He, t)64Cu reaction

In order to study the Gamow-Teller (GT) transitions in the fp-shell nucleus 64 Cu, the 64 Ni( 3 He, t) 64 Cu charge-exchange reaction was investigated at E3 He = 140 MeV/nucleon [1]. The outgoing tritons were momentum analysed by the Grand Raiden spectrometer at 0°. The very high energy resolution of 35 keV (FWHM) allowed the separation of individual levels in the excitation energy region from 0 to 3.5 MeV. An angular distribution analysis was performed for the observed transitions to these states. In addition to the ground state (g.s.), known to be a J π = 1 + GT state, several excited states showed L = 0 nature, making them candidates of GT states. At higher excitation energies, the level density becomes very high and a bump-like structure, the so-called GT Giant Resonance, dominates the spectrum.