(6Li,6He) reaction at 100 MeV/nucleon as a probe of spin-excitation strengths

For a selective excitation of spin-flip strength, (Li-6,He-6) reactions can be a useful tool, because: a) Li-6 and He-6 have ground-state spin and parity values J(pi) = 1(+) and 0(+), respectively; b) He-6 has no particle-stable excited state, thus effects from ejectile excitation can be avoided. The (Li-6,He-6) experiments were performed at 100 MeV/nucleon, at which incident energy the reaction is expected to be single-step dominant. Through the analysis of the good-resolution (Li-6,He-6) data on C-13, Mg-26, Al-27 and Ni-58 targets, the evidence for a proportional relationship between 0 degrees cross sections and the corresponding Gamow-Teller transition strengths is examined. Suppression of non-spin flip excitations is discussed based on the hindrance of the excitation of the isobaric analog state. (C) 1999 Published by Elsevier Science B.V. All rights reserved.