Isomer ratios for products of photonuclear reactions on Rh

Oleg Bezshyyko,Stanislav Olejnik,Oleksandr Vodin,Andrii Kotenko,Viktor Mitrochenko,Ihor Kadenko,Volodymyr Kushnir,Sergey Perezhogin,Tetiana Povar,Larisa-Bezshyyko Golinka,Z Ge,W Wang,Y Chen,H Zhang,N Shu

doi:10.1051/epjconf/202023901026

Oleg Bezshyyko, Stanislav Olejnik + Show 13 more

Open Access

https://doi.org/10.1051/epjconf/202023901026

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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.

Highlights

Using high energy gamma-quanta as projectiles in nuclear reactions has some essential advantages to study the nuclear structure and nuclear reaction mechanisms
During last several years an essential progress has been achieved in development of the new theoretical models for the photonuclear reactions and in refinement of the existing ones in the considered energy region
The quasideuteron model was further improved [2], some new preequilibrium models have been developed for description of the multi-particle emission [3]

Summary

Introduction

Using high energy gamma-quanta as projectiles in nuclear reactions has some essential advantages to study the nuclear structure and nuclear reaction mechanisms. The energy region of photonuclear reactions between Giant Dipole Resonance (GDR) and pion-producing threshold (from about 30 to about 100 MeV of gamma-quanta energy) is not sufficiently studied both theoretically and experimentally [1]. During last several years an essential progress has been achieved in development of the new theoretical models for the photonuclear reactions and in refinement of the existing ones in the considered energy region. Growing interest in Accelerator Driven Systems and progress in the design of high intensity quasi mono-energetic gammaquanta sources [4] stimulates studying the photonuclear reactions above the GDR energy region. Very limited experimental data for the photonuclear reactions in the energy range (30-100) MeV for testing newly developed and available theoretical models was the major motivation for the present work

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