Role of photon strength function models in describing high energy γ-ray spectra

The high-energy γ rays (5-30 MeV) produced during nuclear collisions provide a clean probe to study the reaction dynamics and properties of hot and rotating atomic nuclei. Depending on the target-projectile combination and relative kinetic energy, the γ rays are produced by two-step compound nuclear mechanism, direct and semidirect capture, nucleon-nucleon Bremsstrahlung process etc. The γ rays produced by compound nuclear process are theoretically corroborated by the statistical model calculations. One of the key ingredients of the statistical model calculations involving γ rays is photon strength function (PSF) by which the average electromagnetic property of excited nucleus is described. It is interesting that the PSF derived using a simple Lorentzian reproduce the data fairly well in the entire region compared to other two models of the PSF calculated using the same GDR parameters. It was also observed the M1 strength, which is parameterized as a simple Lorentzian in the TALYS code, also plays a crucial rule in the calculations. However, it should be stressed that these are preliminary results. The detailed analysis is in progress and will be presented during the symposium