Abstract
Spin-isospin excitations in nuclei have been studied by means of the ( 3He,t) reactions at 450 MeV on the targets 9Be, nat C, 28Si, 58Ni, 62Ni, 90Zr, 118Sn, 120Sn, 124Sn, and 154Sm. The new spectrometer “Grand Raiden” was employed for the ( 3He,t) study for the first time. Observed ( 3He,t) spectra at 0° show remarkable similarity with those from the (p,n) results at intermediate energies, suggesting a simple direct reaction mechanism for the ( 3He,t) reaction at 450 MeV. The Gamow-Teller (GT) resonances and the spin-flip ΔL = 1 resonances are excited very strongly. A fine structure of the GT resonances in medium-heavy nuclei is observed with an energy resolution of 210 keV. It is demonstrated that the ( 3He,t) reaction at 450 MeV is a powerful tool to study the spin-isospin excitations in nuclei.
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