Measurement of photo-neutron cross-sections in (208)Pb and (209)Bi with 50-70 MeV bremsstrahlung
SCIE
SCOPUS
- Title
- Measurement of photo-neutron cross-sections in (208)Pb and (209)Bi with 50-70 MeV bremsstrahlung
- Authors
- Naik, H; Singh, S; Goswami, A; Manch; a, VK; Kim, G; Kim, KS; Lee, MW; Rahman, MS; Raj, D; Ganesan, S; Suryanarayana, S; Cho, MH; Namkung, W
- Date Issued
- 2011-06-15
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- The photo-neutron cross-sections of Pb-208 and Bi-209 induced by 50-70 MeV bremsstrahlung have been measured by using the off-line gamma-ray spectrometric technique in the electron linac at the Pohang Accelerator Laboratory. The experimental Pb-208(gamma,xn) and the Bi-209(gamma,xn) reactions cross-sections at the bremsstrahlung energy region of 50-70 MeV, which are determined for the first time, are in general good agreement with the theoretical values based on the TALYS 1.0 code. We observed that the photo-neutron cross-sections for the (gamma,xn) reactions of Bi-209 and Pb-208 increase with increasing of bremsstrahlung energy from 50 to 70 MeV, which indicates the role of excitation energy. It was also observed that the (gamma,xn) reaction cross-sections of the doubly magic shell nuclei Pb-82(126) are always higher than those of the singly magic shell nuclei B-83(126) in the bremsstrahlung energy of 50-70 MeV. This may be due to the fact that either the shell effect are washed out at the higher excitation energy or due to the lower fission cross-section of Pb-208 compared to that of Bi-209. This observation indicates that there is a competition reaction between fission and neutron emission. (C) 2011 Elsevier B.V. All rights reserved.
- Keywords
- 50-70 MeV bremsstrahlung; Photo-neutron cross-sections; Pb-208(gamma,xn) and Bi-209(gamma,xn) reactions; Off-line gamma-ray spectrometric technique; HIGH-ENERGY PHOTOFISSION; PHOTOEXCITATION MECHANISMS; INTERMEDIATE-ENERGY; PB-NAT; DELTA-REGION; FISSION; BI; NUCLEI; MASS; DISTRIBUTIONS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/17231
- DOI
- 10.1016/J.NIMB.2011.04.008
- ISSN
- 0168-583X
- Article Type
- Article
- Citation
- NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, vol. 269, no. 12, page. 1417 - 1424, 2011-06-15
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.