Abstract
The (t,αLu reaction has been studied using beams of 17 MeV tritons from the McMaster University tandem Van de Graaff accelerator. Reaction products were analyzed with a magnetic spectrograph, and the resolution achieved for the alpha spectra was ∼20 keV (FWHM). Two-quasiparticle states in involving the 9/[624] target neutron coupled with the 7/[404], 9/[514], and 1/[411] proton orbitals were identified. The difference in ground-state (t,α) Q values for and components of the target, combined with the known masses of , , and , yields an improved value of -50 351±5 keV for the mass excess of . This result, combined with the two-quasiparticle assignments from the present work, has resolved the long-standing puzzle concerning the character and excitation energy of the well-known 23 min high-spin beta-decaying isomer in .
- Received 28 July 1992
DOI:https://doi.org/10.1103/PhysRevC.47.131
©1993 American Physical Society