Abstract
The /sup 48/Ca(/sup 10/B,..cap alpha..3n)/sup 51/V and /sup 48/Ca(/sup 10/B,5n) /sup 53/Mn reactions have been used to populate high spin states in /sup 51/V and /sup 53/Mn. New levels were observed at 7335 keV in /sup 51/V, with a probable spin of J = 23/2 and at 5614, 6533, 7004, and 7965 keV in /sup 53/Mn with a probable spin sequenceof J = 19/2, 21/2, 23/2, and 25/2, respectively. The Doppler shift attenuation method was used to measure the mean lifetimes of four levels in /sup 51/V and three in /sup 53/Mn. The high spin states were found to decay predominantly by M1 transitions, while competing E2 decays were not significantly enhanced, revealing no evidence of any collective deformation. Shell model calculations of 1p6h states in /sup 51/V and 1p4h states in /sup 53/Mn were found to indicate that these excited states are based mainly on neutron excitation from the f/sub 7/2/ shell. The calculations reproduced both the positions of the yrast energy levels and their electromagnetic decays.
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