The γ-decay of a [formula omitted] analogue state in 51Mn

Abstract

A high-accuracy investigation of the γ-decay of the E p = 1059 and 1071 keV resonances in the reaction 50Cr(p, γ) 51Mn has been performed. The E p = 1059 keV resonance is shown to be the analogue state corresponding to the E ∗ = 1899 keV, J π = 3 2 − parent state in 51Cr. From (p, γ) angular distributions, mixing ratios of the primary γ-transitions depopulating this resonance and J π values of many states populated in the γ-decay have been determined. The total γ-width of this 1059 keV resonance is found to be Γ γ = 0.055 eV. The analogue-anti-analogue transition strength is 0.009 W.u. and fits well into our systematics of IAS → AIAS transitions in f-p shell nuclei. The main part of the M1 strength in the γ-decay of the IAS is absorbed in 1 2 − and 3 2 − core polarized states. A comparison of the level scheme of 51Mn obtained from the decay schemes of the (p, γ) resonances with calculations in the Coriolis strong coupling model shows evidence for a g.s. deformation of 51Mn.