Production cross-sections of Mo-isotopes induced by fast neutrons based on the 9 Be( p , n ) reaction
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Production cross-sections of Mo-isotopes induced by fast neutrons based on the 9 Be(p, n) reaction Haladhara Naik1,2 , Guinyun Kim2,a Muhammad Sahid2
, Kwangsoo Kim2 , Muhammad Nadeem2 ,
1 Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India 2 Department of Physics, Kyungpook National University, Daegu 41566, Republic of Korea
Received: 14 May 2020 / Accepted: 28 August 2020 © Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract We measured the flux-weighted average cross-sections of the 100 Mo(n, 2n)99 Mo and 92 Mo(n, 3n)90 Mo reactions with the average neutron energies between 14.0- and 31.8MeV by using an activation and off-line γ-ray spectrometric technique. The fast neutrons were generated based on the 9 Be(p, n) reaction with the proton energies of 25-, 35- and 45-MeV from the MC-50 Cyclotron at the Korea Institute of Radiological and Medical Sciences (KIRAMS). The neutron flux was measured by using the 27 Al(n, α)24 Na monitor reaction, whereas the neutron spectra were simulated by using the MCNPX 2.6.0 code. The theoretical cross-sections of the 100 Mo(n, 2n)99 Mo and 92 Mo(n, xn)91.90,89 Mo reactions as a function of mono-energetic neutron were calculated by using the TALYS-1.9 code. The present results for the 100 Mo(n, 2n)99 Mo and 92 Mo(n, 3n)90 Mo reactions are compared with the calculated neutron flux-weighted average values based on the literature data and theoretical cross-sections as a function of mono-energetic neutron energy, and show a good agreement.
1 Introduction The nuclear reaction cross-sections of different elements induced by protons, fast neutrons and high-energy photons are important for their application in an accelerator driven subcritical system (ADSs), fast reactor, accelerator, and industrial and medical field as well as to study the nuclear structure, reaction mechanisms and theoretical models. In particular, the proton, fast neutron, and high-energy photon-induced reaction cross-sections of various Mo-isotopes are very much important from the point of production of the medical isotopes 99m Tc and 99 Mo. The radioisotope 99m Tc is used for the diagnosis (both in vivo and vitro), therapeutic and preventive applications [1, 2]. Around the world, about 80% of all diagnostic imaging studies [3–5] of various organs of human body are carried out by using the 99m Tc isotope. The radioactive 99m Tc isotope can be bound into a variety of special molecules that target specific parts of the body when ingested or injected [6, 7]. The location of 99m Tc within the body can be detected by measuring the 140.5 keV γ-ray of 99m Tc by single-photon emission computed tomography (SPECT) imaging. In the body, 99m Tc is used primarily to locate
a e-mail: [email protected] (corresponding author)
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tumors, monitor cardiac functions following heart attacks, map blood flow in the brain and guide surgery. The radionuclide 99m Tc can be directly produce
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