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Chinese Physics C> 2001, Vol. 25> Issue(10) : 994-1001 

Study on γ-Ray Strength Functions and Energy Spectra in the Neutron Radiative Capture of 197Au

  •  Department of Physics, Zhengzhou University, Zhengzhou, 450052, China2 China Institute of Atomic Energy, Beijing, 102413, China

  • The aim of this paper is to explain theoretically the abnormal protuberances near and after 5.5 MeV in the gamma spectra of the (n, γ) reactions for the nulei in the regions of 110≤A≤140 and 180≤A≤210.
    Supposing that in the primary and cascade gamma de-excitation processes of the compound nu- cleus, besides the giant dipole resonance model, there exist the deexcitation processes of the excited states of 6He,6Li,6Be,7Li and 7Be particle Clusters, the γ-ray strength function in which these pro- cesses are contained was constructed. The (n ,γ) reaction cross sections and the gamma energy spec- tra in the neutron incident energy region from 0.01 MeV to 3MeV for 197Au were calculated. The re- suIts are in better coincidence with the experiments. Especially for the gamma energy spectra, the abnormal protuberances near and after 5.5MeV were reproduced very well.
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    [1] Lane A M, Thomas R G. Rev. Mod. Phys., 1958, 30:2572 Allen B J et al. Advances in Nucl. Phys., 1978 , 10: 129 3 Raman S et al. Phys. Rev., 1985, C32:18 4 HUO Yu–Kun et al. Nucl. Phys., 1983, A406:1 5 LJU Jian–Feng et al. High Energy Phys. and Nucl. Phys., 1983, 3:355 (in Chinese)(刘建峰等,高能物理与核物理,1983,3:355)6 Lane A M, Lynn J E. Nucl. Phys., 1959, 11:6467 Kopcky J, Ukl M. Phys. Rev., 1990, C41: 19418 DING Da–Zhao. Progress in Neutron Radiative Capture stydy. Nuclear Physics. Material Compilation of tke Conference in 1978.Beijing: Atomic Energy Press, 1979. 292–306 (in Chinese)(丁大钊.中子辐射俘获研究进展.原子核物理,1978年会议资料选编.北京:原子能出版社,1979.292—306)9 Bergqvist I et al. he. Nucl. Phys., 1970,11: 1 10 Lane A M. Nucl. Phys., 197l, 63:171 11 Barthelomew G A. Advances in Nucl. Phys., 1973, 7: chap.4 12 Ajzenberg–selove F. Nucl. Phys., 1984, A413: 113 Becchetti F D et al. Phys. Rev., 1969, 182: 1190 14 Gilbert A, Cameron A G W. Can. J. Phys., 1965 , 43: 144615 Dietrich S S et al. Atondc Data and Nuclear Data Tables, 1988 , 38: 199 16 M B. Nuclear Data Sheets, 1981, 34: 105 17 Auble R L. Nuclear Data Sheets, 1983, 40: 301 18 EXFOR (Exchange Format), Computerized System for the Storage, Retrieval and Intemational Exchange of Experimental NuclearReaction Data, Coordinated by the IAEA Nuclear Data Section.

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LIU Jian-Feng, ZHAO Wei-Juan, WANG Feng-Ge and SU Zong-Di. Study on γ-Ray Strength Functions and Energy Spectra in the Neutron Radiative Capture of 197Au[J]. Chinese Physics C, 2001, 25(10): 994-1001.
LIU Jian-Feng, ZHAO Wei-Juan, WANG Feng-Ge and SU Zong-Di. Study on γ-Ray Strength Functions and Energy Spectra in the Neutron Radiative Capture of 197Au[J]. Chinese Physics C, 2001, 25(10): 994-1001. shu
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Received: 2000-09-22
Revised: 1900-01-01
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Study on γ-Ray Strength Functions and Energy Spectra in the Neutron Radiative Capture of 197Au

    Corresponding author: LIU Jian-Feng,
  • Department of Physics, Zhengzhou University, Zhengzhou, 450052, China2 China Institute of Atomic Energy, Beijing, 102413, China
  • Received Date: 2000-09-22
  • Accepted Date: 1900-01-01
  • Available Online: 2001-10-05

Abstract: The aim of this paper is to explain theoretically the abnormal protuberances near and after 5.5 MeV in the gamma spectra of the (n, γ) reactions for the nulei in the regions of 110≤A≤140 and 180≤A≤210.
Supposing that in the primary and cascade gamma de-excitation processes of the compound nu- cleus, besides the giant dipole resonance model, there exist the deexcitation processes of the excited states of 6He,6Li,6Be,7Li and 7Be particle Clusters, the γ-ray strength function in which these pro- cesses are contained was constructed. The (n ,γ) reaction cross sections and the gamma energy spec- tra in the neutron incident energy region from 0.01 MeV to 3MeV for 197Au were calculated. The re- suIts are in better coincidence with the experiments. Especially for the gamma energy spectra, the abnormal protuberances near and after 5.5MeV were reproduced very well.

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