Study of photon strength functions from thermal neutron capture

A subject of this thesis is to gain information on absolute photon strength function at gamma-ray energies around 4 - 8 MeV in two Gadolinium isotopes. This energy range is known as a ''low-energy'' tail region of E1 resonance. The absolute photon strength function is obtained from comparison of the sum of intensities of transitions and the number of transitions observed in thermal neutron capture on $^{155}$Gd and $^{157}$Gd with prediction from statistical model under various assumptions on photon strength functions and level densities. Powered by TCPDF (www.tcpdf.org