Abstract
Radioactive (∼5-day) was produced by the bombardment of with particles. It was found to decay by capture to . A decay scheme has been proposed which includes the following excited states of : 89 kev (2+), 289 kev (4+), 581 kev (6+), 1134 kev (2+), 1229 kev (3+), 1489 kev (4+), 1604 kev, 1904 kev (3), and 2024 kev (4-). The assignments of spins of levels and multipolarities of gamma-ray transitions are based on the results of measurements of conversion coefficients and gamma-gamma angular correlations. A value of (1.5±0.3)× sec was found for the mean life of the 289-kev level of . The level scheme is discussed in the light of the unified model. The results support the suggestion that the 1134-kev and 1229-kev levels should be interpreted as collective vibrational levels.
- Received 16 February 1959
DOI:https://doi.org/10.1103/PhysRev.115.412
©1959 American Physical Society