Abstract
The β decay of the neutron-rich nuclides, 40-s , 1.7-s , and 0.4-s to levels of odd-Z , , and , respectively, has been studied using sources isolated from fission products by on-line mass separation. The data collected include gamma-ray and conversion electron singles spectra as well as gamma-ray coincidence and angular correlation spectra. New levels have been identified in including a doublet at 393 keV, and new spin and parity assignments are proposed. New data are presented for levels in support of an earlier proposed level scheme by Talbert and Cook. Evidence for a 0.4-s half-life for has been found, and a level at 90 keV is proposed for . The resulting level structures for the neutron-rich Cs nuclides are compared with level structures of other odd-Z neutron-rich nuclides and neutron deficient Cs nuclides. The transition from the structure observed near the closed N=82 neutron shell to deformed structures described by Nilsson model orbitals is discussed.
- Received 22 December 1987
DOI:https://doi.org/10.1103/PhysRevC.38.905
©1988 American Physical Society