Abstract
The helium-jet recoil transfer technique has been used to study the decays of , , , and , produced by , , , and reactions, respectively. Decay properties of these four radioactivities have been deduced from the analysis of extensive singles and multiparameter spectroscopic measurements. The low lying level structure of , as revealed by the decay of , can be reproduced through calculations of the interacting-boson-approximation model which place at or near the O(6) limit. Positron endpoint measurements [deduced from () coincidence studies] have been used to determine decay energies for each of these nuclides. Nuclidic mass excesses inferred from these data show progressively larger deviations from the predictions of currently available mass models for the more neutron-deficient isotopes as the line is approached. It is suggested that this may reflect the influence of nuclear deformation of these isotopes on the mass surface in the vicinity of .
[RADIOACTIVITY from ; from ; from ; from ; measured , , , , , , , , (), (), () coincidences; deduced levels, , , mass excess, , He-jet system, enriched targets, Ge(Li), Ge and plastic detectors; comparison with mass predictions.]
- Received 28 January 1981
DOI:https://doi.org/10.1103/PhysRevC.24.260
©1981 American Physical Society