[3.56 MeV]) reaction at 100 MeV/u as a probe of Gamow-Teller transition strengths in the inelastic scattering channel*

The (6Li,6Li^∗[T = 1, T_z= 0, 0⁺, 3.56 MeV]) reaction at 100 MeV/u was developed as a probe for isolating the isovector spin-transfer response in the inelastic channel from which the Gamow-Teller transition strengths from nuclei of relevance for inelastic neutrino-nucleus scattering cross sections can be extracted. By measuring the ⁶Li ejectile in the Grand Raiden magnetic spectrometer and selecting events in which the 3.56 MeV γ ray from the decay of the ⁶Li^*[3.56 MeV] state is detected, the isovector spin-transfer selectivity is obtained. HPGe clover detectors in the CAGRA array served to detect the γ rays. In the study of the ¹²C(⁶Li,⁶Li^∗[3.56 MeV]) reaction, the isovector spin-transfer excitation-energy spectrum in the inelastic channel was successfully measured. For heavier target nuclei, the extraction of the isovector spin-transfer response was hampered by the background in the γ-spectra from isoscalar excitations.