Abstract
The neutron-rich isotopes have been produced at the LISOL facility in the fission of induced by a 30-MeV proton beam. They have been extracted selectively through resonant laser ionization and electromagnetic mass separation. Production rates have been deduced and deviate from theoretical predictions. The decay of the isotopes has been investigated by means of and spectroscopy. Half-lives have been determined for and the level scheme has been extended for and newly established for The constructed schemes show an unexpected and sharp lowering of the orbital with respect to the ground state. This feature is ascribed to the monopole term of the residual proton-neutron interaction and is well reproduced by realistic shell-model calculations.
- Received 1 November 2000
DOI:https://doi.org/10.1103/PhysRevC.64.054308
©2001 American Physical Society