Cross-Sections in Photonuclear Reactions With Multiple Neutron Emission

Abstract

The energy dependence of the reaction cross-sections A(γ,xn)(A-xn) was studied in the energy range 19...70 MeV, i.e. beyond Great Dipole Resonance (GDR) region. Experimental data were taken from international database EXFOR for range of nuclear mases (55 < A < 209). Theoretical values of cross sections were obtained using TALYS-1.8 code. Several models of level densities with both enabled and disabled pre-equilibrium mechanism were considered in our simulations. Obtained results let us to make conclusions about different mechanisms of photonuclear reactions on certain nuclei, energy dependence of their relative contribution.

Photoneutron reactions on 93Nb at Emax=33–93 MeV

“…Summarizing the analysis of the known experimental data on the photodisintegration of 93 Nb in the region of -quanta energies above 30 MeV, it should be noted that they are extremely discrete and local. It will be fair to say that a similar situation has developed for other nuclei, despite the many years of efforts made by experimenters to solve this problem [32,33].…”

Study the Isomeric Ratios in Photonuclear Experiments on the Lue-40 Linac RDC “Accelerator” NSC Kipt

“…The results obtained are presented in order of increasing atomic charge (mass): Zr [26], Nb [27], Mo [28], Rh [29], Ag [30 -32], In [30,31], Sb [33 -35], Ta [36].…”

“…Calculation in TALYS1.95, LD1. Experiment: green -113 In(γ,3n) 110m,g In [30,31], red -115 In(γ,5n) 110m,g In [30 -32], black - [64] The 113 In(γ,3n) 110m,g In reaction is separated from the 115 In(γ,5n) 110m,g In reaction by the reaction threshold. Fig.…”

“…This article presents the results of the IR measurements obtained at linear accelerator LUE-40 RDC "Accelerator" NSC KIPT for the target nuclei: Zr [26], Nb [27], Mo [28], Rh [29], Ag [30][31][32], In [30,31], Sb [33][34][35], and Ta [36]. The calculations of theoretical IRs were performed using cross-sections of the TALYS1.95 code for six different level density models.…”