By deriving the angle between the proton and neutron spin vectors j ជ and j ជ in the shears bands in 198,199 Pb, we present a semiclassical analysis of the B(M 1) and B(E2) transition probabilities as a function of the shears angle. This provides a semiempirical confirmation of the shears mechanism proposed by Frauendorf using the tilted-axis-cranking model. In addition, we propose that the rotational-like behavior observed for these bands may arise from a residual proton-neutron interaction. ͓S0556-2813͑98͒51303-9͔
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LL. CD I COWe have studied the angular correlation of continuum y rays in coincidence with an array of Nal counters following heavy-ion compound-nucleus re actions 0 This technique can both enhance the measured angular correlations and enrich the spectrum in high-angularmomentum events. The results extend previous ideas about the quadrupole bumps and exponential tails observed in such spectra, and reveal for the first time intense low-energy stretched dipole transitions in nuclei near closed shells.
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