Speaker
Description
N. Jovancevic$^1$, M. Krmar$^1$, S. Abou El-Azm$^2$, M. Demichev$^2$, D. Demin$^2$, M. Gostkin$^2$, V. Kobets$^2$, U. Kruchonak$^2$, A. Nozdrin$^2$, S. Porokhovoy$^2$, T.Shneydman$^2$, A. Zhemchugov$^2$, D. Knezevic$^3$, D. Maletic$^{3}$
$^1$) Department of Physics, Faculty of Science, University of Novi Sad, Serbia \
nikola.jovancevic@df.uns.ac.rs\
$^2$) Dzhelepov Laboratory of Nuclear Problems, Joint Institute for Nuclear Research (JINR), Dubna, Russian Federation\
$^3$) Institute of Physics Belgrade, University of Belgrade, Belgrade, Serbia
In this work we are presented research that would aim to obtain new experimental data on the parameters of photo nuclear reactions using the electron accelerator LINAC 200[1], located at the Dzhelepov Laboratory of Nuclear Problems of the JINR, Dubna, Russia. Unique characteristics of the LINAC 200 provide excellent conditions for collecting reliable data on photo-nuclear reaction. At the LINAC 200 facility the electron beams with energy in the range from 20 MeV up to 200 MeV are available. The possibilities of obtaining reliable data at the LINAC 20 0were analyzed in this study during photo activation measurements of $^{209}$Bi.
Natural bismuth targets were irradiated in Bremsstrahlung photon beams at four end point energies: 40 MeV, 60MeV, 80 MeV and 100 MeV. The advantages of bismuth are that it is a natural monoisotope of $^{209}$Bi and products of $^{209}$Bi($\gamma$,xn) nuclear reactions have a sufficiently long half-life to be registered in standard activation measurement, when the gamma spectra are collected off-line. In this work the reaction yields of several $^{209}$Bi($\gamma$,xn) photo nuclear reactions in a wider energy range were extracted. Another objective of this work was to compare experimentally obtained values of the reaction yields with results of theoretical calculations. The used theoretical model is explained in detail in this work. The present results are the first experimental data on these photo nuclear reactions in energy region between 40 and 100 MeV and this study will be the basis for future measurements at the LINAC 200 facility.
[1] M. Krmar, Y. Teterev, A.G. Belov, S. Mitrofanov, S. Abou El-Azm, M. Gostkin, V. Kobets, U. Kruchonak, A. Nozrin, S. Porokhovoy, M. Demichev, Beam energy measurement in LINAC-200 accelerator and energy calibration of scintillation detectors by electrons in range from 1 MeV to 25 MeV, Nuclear Instruments and Methods in Physics Research A 935, 83-88 (2019), 10.1016/j.nima.2019.04.104.
