Isomer ratios for products of photonuclear reactions on ¹²¹Sb

Abstract

Abstract. Over the past several years various preequilibrium model approaches for nuclear reactions were developed. Diversified detailed experimental data in the medium excitation energy region for nucleus 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 region extends between bremsstrahlung energies nearly 30-100 MeV. Experimental measurements and estimations of isomer ratios for products of photonuclear reactions with multiple particle escape on antimony have been performed using bremsstrahlung with end-point energies 38, 43 and 53 MeV. Method of induced activity measurement was applied. For acquisition of gamma spectra we used HPGe spectrometer with 20% efficiency and energy resolution 1.9 keV for 1332 keV gamma line of 60 Co. Linear accelerator of electrons LU-40 was a source of bremsstrahlung. Energy resolution of electron beam was about 1% and mean current was within (3.8-5.3) µA.

Isomer ratios for products of photonuclear reactions on Rh

“…where S i , i = g, m -photo-peak area (in the gamma spectrum of the activation products), coefficient C includes self-absorption factor, true coincidence effects of cascade gammas and other effects, ϵ -full efficiency of gamma detection for the analysed gamma-line; f i , i = g, m -quantum yield of gamma-line for i-state decay (transition probability for this line); coefficients Λ j , j = 1, 9 are defined by t 1 , t 2 , t 3 , -irradiation time, cooling time and measurement time, respectively and determined in the ref [9].…”

Isomer Ratios in Photonuclear Reactions With Multiple Neutron Emission

“…EXP[30] → 109 Ag(γ, 5n) 104 Ag is well-described with LD4 and LD2 with pre-equilibrium mechanism; → for 113 In(γ, 3n)110 In the difference between theoretical models is of one order with statistical error of experimental data, and all theoretical models are in good agreement with experiment;121 Sb(γ, 5n) 116 Sb. EXP[22] →121 Sb(γ, 3n)118 Sb is well-described with LD5 and LD6 with enabled pre-equilibrium mechanism;121 Sb(γ, 3n)118 Sb . EXP[22] → 140 Ce(γ, 3n) 137 Ce is well-described with LD1 at 30 M eV ; and 70 M eV statistical error of experimental data covers all theoretical models;…”

“…EXP[22] →121 Sb(γ, 3n)118 Sb is well-described with LD5 and LD6 with enabled pre-equilibrium mechanism;121 Sb(γ, 3n)118 Sb . EXP[22] → 140 Ce(γ, 3n) 137 Ce is well-described with LD1 at 30 M eV ; and 70 M eV statistical error of experimental data covers all theoretical models;…”

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

“…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.…”