SHEARS BANDS IN PB-201 AND PB-202

High-spin states in (201)pb and Pb-202 have been investigated using in -beam gamma-ray spectroscopic techniques. Seven regular sequences of e nhanced dipole transitions, with weak E2 crossovers in some cases, hav e been found, one of which is firmly connected to low-lying levels in (201)pb. These bands are interpreted to be built on high-spin proton-p article neutron-hole excitations. Tilted-axis cranking calculations sh ow that the angular momentum along the bands is predominantly generate d by a continuous and simultaneous reorientation of the proton and neu tron spins into the direction of the total angular momentum (shears ef fect).