Isomer ratios for products of photonuclear reactions on Rh

Abstract

Over the past several years various preequilibrium models for nuclear reaction mechanisms description were developed. Diversified detailed experimental data in the medium excitation energy region for nuclei are needed for reasonable selection among these theoretical models. Lack of experimental data in this energy region does essentially limit the possibilities for analysis and comparison of different preequilibrium theoretical models. For photonuclear reactions this energy range covers 30-100 MeV. Experimental measurements and estimations of isomer ratios for products of photonuclear reactions with multiple particle escape on antimony were performed using bremsstrahlung spectrum as projectile with end-point energies 74,9 and 85,7 MeV. Method of the induced activity measurement was applied. For acquisition of gamma spectra we used HPGe spectrometer with 20% relative efficiency. Linear accelerator of electrons LU-40 was a source of bremsstrahlung. Energy resolution of electron beam was about 1% and a mean electron current varied within (3.8 - 5.3)μA.

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].…”

“…The measured [29] and calculated in code TALYS1.95 results of the isomeric ratios IR for the 103 Rh(,4n) 99m,g Rh reaction are presented in Fig. 6.…”

“…Calculation in TALYS1.95, LD1-6. Experiment: blue - [61], red - [62], black - [29] Values of the isomeric ratios for nuclei 104m,g Ag as products of the photonuclear reactions 107 Ag(γ,3n) 104m,g Ag and 109 Ag(γ,5n) 104m,g Ag were obtained in [30 -32]. Natural silver consists of two stable isotopes: 107 Ag -0.51839 and 109 Ag -0.48161.…”

“…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.…”