Determination of the electric dipole (E1) gamma ray strength function of 56Mn from the Bn level to low levels by two-step gamma cascades

Abstract

Investigation of gamma ray strength function is necessary to determine some nuclear characteristics, such as: spin, parity, electromagnetic transitions, cross section, … In this research, ⁵⁵Mn target was activated on the neutron of 3^rd horizontal channel of Dalat nuclear reactor. The experimental data was collected by event-event coincidence by gamma-gamma coincidence system. The ⁵⁶Mn deexcitation afforded the collected of 49 gamma – gamma two-step cascades. This was applied on shell model to determine the spin, parity, electric dipole gamma strength function (E1) as  well as comparing between the theoretical and experimental E1 transition probabilities.