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 3rd horizontal channel of Dalat nuclear reactor. The experimental data was collected by event-event coincidence by gammagamma coincidence system. The 56Mn deexcitation afforded the collected of 49 gamma – gamma twostep 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