Properties of Shears Bands in ^198,199Pb
Abstract
Regular sequences of magnetic dipole transitions have been observed in several nuclei of the A ~190 region. It has been suggested that these bands represent a novel mode of nuclear excitation where high angular momentum is quantally generated via the simultaneous reorientation of the large spin vectors of proton--particles (h_9/2 and i_13/2) and neutron--holes (i_13/2) along a tilted axis (relative to the commonly defined principal axes). This has been called the `shears mechanism'. An important test of this model comes from the measurement of the lifetimes of in--band states. Results from a recent GAMMASPHERE experiment aimed at measuring the lifetimes of states in the M1 bands of ^198,199Pb will be reported.
- Publication:
-
APS Meeting Abstracts
- Pub Date:
- May 1996
- Bibcode:
- 1996APS..MAY.C1402C