The low-energy M1 γ-strength from radiative proton capture experiment

Abstract

The multipolarity of the low-energy (< 3 MeV) γ–strength function has been experimentally studied with the 55Mn(p,2γ)56Fe reaction at 1.65 MeV proton beam energy. The spectrum of two-step γ–cascades populating the ground state of 56Fe has been measured and compared with calculations assuming that E1 or M1 multipolarities dominate in the low-energy region. It was found that experimental data points are reproduced only if the assumption on dominance of the M1 multipolarity is used.