First observation of excited states in the T=-1, odd-odd nucleus Mn-48

Gamma decays depopulating excited states in the odd-odd N = Z - 2 nucleus Mn-48 have been observed for the first time. The yrast band has been built up from the 4(+) ground state to 13(+), just shy of the expected band termination at 15(+). When compared with its mirror, V-48, the Coulomb energy differences are unlike any other previously measured which, until now, have been dominated by a sudden rotational alignment. Such an alignment is expected to be blocked in these odd-odd nuclei and calculations not only confirm this, but also infer that any Coulomb difference is mostly due to monopole effects.

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