Abstract
The γ-ray strength function, the average reduced probability of absorbing or emitting a γ-ray of a given energy, is an indispensable quantity for calculations of astrophysical interest. Experimental studies of the γSF have revealed an enhancement of this quantity in the low Eγ energy region, which cannot be described by none of the known resonances or by semiclassical models. To understand the origin of the low-energy enhancement we have calculated the M1 transition probabilities, both in the emission and absorption regions, for the 49,50Cr and 48V nuclei in the f7/2 shell-model basis. We find that the M1 strength distribution peaks at zero transition energy and falls off exponentially, independentely of the excitation energy or spin range selected. The form of this exponential is the same across all three different nuclei studied within this model space. We also show that the slope of the exponential is proportional to the strength of the T = 1 pairing matrix elements.
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