Cross sections for the Ti(p,n) reaction to analogs of ground and 2+ excited states

Cross sections for the (p,n) reaction to analog states have been measured for the five stable isotopes of titanium at energies between 11.5 and 26 MeV. In addition to the ground-state analogs, cross sections to the 21+ analog states for the even A isotopes have been determined. A two-channel analysis of the ground-state analog data, searching on the charge-exchange parameters, did not yield a satisfactory globally consistent description of the 01+ analog cross sections. However, in a full coupled-channel description of the 01+ analog angular distributions the N-Z dependence and the strength of the 21+ analog cross sections for 46,48,50Ti are explained by strong inelastic couplings and by rather different charge-exchange couplings among the three isotopes. The isovector deformation parameters used in the charge-exchange couplings were determined from electromagnetic and (p,p) values, which were obtained from experiment. The experimental energy dependence of the cross section shows a resonance behavior which is not explained by the channel coupling but which can be adequately accounted for by an energy dependent V1.