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Photo-neutron reaction cross-section for Nb-93 in the end-point bremsstrahlung energies of 12-16 and 45-70 MeV SCIE SCOPUS

Title
Photo-neutron reaction cross-section for Nb-93 in the end-point bremsstrahlung energies of 12-16 and 45-70 MeV
Authors
Naik, HKim, GNSchwengner, RKim, KZaman, MTatari, MSahid, MYang, SCJohn, RMassavczyk, RJunghans, AShin, SGKey, YWagner, ALee, MWGoswami, ACho, MH
Date Issued
2013-10-23
Publisher
ELSEVIER SCIENCE BV
Abstract
The photo-neutron cross-sections of Nb-93 at the end-point bremsstrahlung energies of 12, 14 and 16 MeV as well as 45, 50, 55, 60 and 70 MeV have been determined by the activation and the off-line gamma-ray spectrometric techniques using the 20 MeV electron linac (ELBE) at Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany, and 100 MeV electron linac at Pohang Accelerator Laboratory (PAL), Pohang, Korea. The Nb-93(gamma, xn, x = 1-4) reaction cross-sections as a function of photon energy were also calculated using computer code TALYS 1.4. The flux-weighted average values were obtained from the experimental and the theoretical (TALYS) values based on mono-energetic photons. The experimental values of present work are in good agreement with the flux-weighted theoretical values of TALYS 1.4 but are slightly higher than the flux-weighted experimental data of mono-energetic photons. It was also found that the theoretical and the experimental values of present work and literature data for the Nb-93(gamma, xn) reaction cross-sections increase from the threshold values to a certain energy, where other reaction channels opens. However, the increase of Nb-93(gamma, n) and Nb-93(gamma,, 2n) reaction cross-sections are sharper compared to Nb-93(gamma, 3n) and Nb-93(gamma, 4n) reaction cross-sections. The sharp increase of Nb-93(gamma, n) and Nb-93(gamma, 2n) reaction cross-sections from the threshold value up to 17-22 MeV is due to the Giant Dipole Resonance (GDR) effect besides the role of excitation energy. After a certain values, the individual Nb-93(gamma, xn) reaction cross-sections decrease with increase of bremsstrahlung energy due to opening of other reaction channels. (C) 2013 Elsevier B.V. All rights reserved.
Keywords
Nb-93(gamma, xn,x=1-4) reaction cross-sections; Au-197(gamma,n)Au-196 and (27) Al(gamma,2pn)Na-24 reactions flux monitor; End-point bremsstrahlung energy of 12-16 and 45-70 MeV; Activation and off-line gamma-ray spectrometric technique; TALYS calculation; GAMMA; SYSTEMS
URI
https://oasis.postech.ac.kr/handle/2014.oak/14412
DOI
10.1016/J.NUCLPHYSA.2013.08.003
ISSN
0375-9474
Article Type
Article
Citation
NUCLEAR PHYSICS A, vol. 916, page. 168 - 182, 2013-10-23
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조무현CHO, MOO HYUN
Div. of Advanced Nuclear Enginrg
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