Properties of high spin states in the(πf72)±3nucleiV51andMn53

The

{}^{48}{Ca} ({}^{10}B, α 3 n) {}^{51}V

and

{}^{48}{Ca} ({}^{10}B, 5 n) {}^{53}{Mn}

reactions have been used to populate high spin states in

{}^{51}V

and

{}^{53}{Mn}

. New levels were observed at 7335 keV in

{}^{51}V

, with a probable spin of

J = \frac{23}{2}

and at 5614, 6533, 7004, and 7965 keV in

{}^{53}{Mn}

with a probable spin sequence of

J = \frac{19}{2}, \frac{21}{2}, \frac{23}{2}, and \frac{25}{2}

, respectively. The Doppler shift attenuation method was used to measure the mean lifetimes of four levels in

{}^{51}V

and three in

{}^{53}{Mn}

. The high spin states were found to decay predominantly by

M 1

transitions, while competing

E 2

decays were not significantly enhanced, revealing no evidence of any collective deformation. Shell model calculations of 1p-6h states in

{}^{51}V

and 1p-4h states in

{}^{53}{Mn}

were found to indicate that these excited states are based mainly on neutron excitation from the

f_{\frac{7}{2}}

shell. The calculations reproduced both the positions of the yrast energy levels and their electromagnetic decays.

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