Abstract
Radioactive sources of were produced in bombardments of . A helium-jet capillary system was used to transport product nuclei to a shielded area suitable for -ray counting. Both singles and coincidence measurements were made. The half-life of was found to be 3.17 ± 0.03 min, in agreement with earlier measurements. This state in is thought to have a low spin, most probably a value of 2; there is also some evidence for the existence of a high-spin isomer, possibly of shorter half-life, based on weak population of high-spin states in . Fifteen levels were placed in , 12 of them previously unknown. The and members of the vibrational band are located at 863.9 and 1004.2 keV; there are also candidates for the and members. An even-odd shift in the band, both in level energies and mixing parameters, is observed with a magnitude greater than in the previously studied cases. A level is placed at 1073.8 keV, and its effect on the band is discussed. From an analysis of the population trends of levels in from Lu decays, we make arguments concerning the available proton and neutron Nilsson orbitals.
[RADIOACTIVITY [from , MeV]. Measured , , , coin. Deduced levels, , , .]
- Received 25 March 1977
DOI:https://doi.org/10.1103/PhysRevC.16.384
©1977 American Physical Society