Second minimum lifetime measurements in Nd133 and Nd137

The quadrupole moments (Q0) of the highly deformed, second minimum bands in Nd133 and Nd137 have been extracted from mean lifetime measurements using the Doppler shift attenuation method. The reactions Pd105(32S,2p2n)133Nd at 152 MeV and Ru104(36S,3n)137Nd at 145 MeV were used. A standard centroid shift analysis was carried out in both cases, which gave values of Q0=(6.0±0.7)e b and (4.0±0.5)e b for Nd133 and Nd137, respectively, corresponding to axial prolate deformations of 20.33 and 0.22. A line-shape analysis was also carried out for Nd133 to check against the possible effect of sidefeeding. The result was Q0=(6.7+0.7)e b, with sightly slower sidefeeding times corresponding to Qsf»5.3e b. The results are in good agreement with the predictions of total Routhian surface calculations, and are discussed in the context of other highly deformed bands in the A=130140 mass region. © 1992 The American Physical Society.