High-spin states in the odd-oddN=Znucleus50Mn

Abstract

High-spin states in the odd-odd $N=Z$ nucleus ${}^{50}\mathrm{Mn}$ have been identified. At low spin, the $T=1$ isobaric analogue states of ${}^{50}\mathrm{Cr}$ are established up to ${I}^{\ensuremath{\pi}}{=4}^{+}.$ At high spin, the $T=0$ band built on the low-lying ${I}^{\ensuremath{\pi}}{=5}^{+}$ isomer in ${}^{50}\mathrm{Mn}$ becomes energetically favored and this band is observed up to its ${f}_{7/2}$-shell termination at ${I}^{\ensuremath{\pi}}{=15}^{+}.$ Spherical shell model calculations in the full $\mathrm{pf}$ shell are found to be in excellent agreement with the experimental results. In addition, a weak side band in ${}^{50}\mathrm{Mn}$ is observed to spin ${(12}^{\ensuremath{-}})$ and is interpreted as a possible octupole vibrational structure.