Isovector giant resonances in 6He, 12B, 90B, 120In, and 208Tl

Abstract

The ( 7Li, 7Be) charge-exchange reaction has been studied at E( 7Li)=350 MeV on targets of 6Li, 12C, 90Zr, 120Sn, and 208Pb. Coincidences with Doppler-shifted γ-rays from the de-excitation in flight of the first-excited state in 7Be were recorded to identify spinflip transitions. Numerous discrete states and giant resonances were observed. Angular distributions were obtained for 6Li and 12C targets. They are well described by microscopic finite-range distorted-waves calculations with theoretical shell-model transition amplitudes and a nucleon-nucleon interaction containing central and tensor components.