STUDY OF 90ZR(3HE,T) REACTION

Differential cross sections were measured for the 90Zr(3He, t)90Nb reaction at 377 MeV. The ground state analogue of 90Zr and some low-lying natural parity (i.e., even J, even parity) states were adequately described by a conventional microscopic DWBA analysis with (g 9 2)p1(g 9 2)n-1 orbitals although the interaction strengths were found to increase with increasing J For the unnatural parity states with T = 4 we found the same discrepancy between theory and experiment as was pointed out in the case of 54Fe(3He, t)54Co studies, viz the microscopic reaction model with central forces predicts that the cross section is dominated by orbital angular momentum transfer L = J -1 while the data is better described by L = J + 1 However, good fits were obtained for the states of 1+ at 2 12 MeV and 3+ at 0 65 MeV by including tensor force in the effective interaction The results indicate that the tensor force is quite important f for exciting these odd-spin states. © 1969.