The A = 51 mirror nuclei 51Fe and 51Mn
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Eighteen previously unknown γ-ray transitions were identified in the Tz = - 1/2 nucleus 51Fe following the fusion-evaporation reaction 32S(28Si,2α1n)51Fe. The level scheme reaches the fully aligned Iπ = 27/2- terminating state of the five holes in the f7/2 shell. The 17/2- state was found to be isomeric, and the lifetime was measured to be 2.87 ns. The mirror symmetry of 51Fe and 51Mn is discussed, and the level scheme of 51Fe is compared to shell-model calculations.
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