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Chinese Physics C> 2007, Vol. 31> Issue(5) : 442-447 

Measurements of Neutron Emission Spectra for Neutron Induced Reactions on 9Be and 6,7Li

  •  China Institute of Atomic Energy, Beijing 102413, China

  • The neutron emission double-differential cross sections(DDXs) of n+9Be and 6,7Li were measured at incident neutron energies of 8.17 and 10.27MeV. At 10.27MeV, the influence of breakup source neutrons from D(d, np) reactions was eliminated by using the combination of abnormal and normal fast neutron TOF spectrometers. The measured TOF spectra were analyzed by detailed Monte-Carlo simulation and the DDXs were determined by comparing the measured TOF spectra with simulated ones. The cross sections were normalized to n-p(normal geometry measurement) or n-C(abnormal geometry measurement) scattering measurement. The measured results were compared with the evaluations and the other measurements. A theoretical model based on the Hauser-Feshbach and exciton model for light nuclei was used to describe the double-differential cross sections of n+6,7Li. Good agreement between theoretical calculation and measurement has been obtained.
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    [1] . EXFOR Systems Manual. BNL-NCS-63330 Rev., April 20012. Drake D M, Auchampaugh G F, Arthur E D et al. Nucl.Sci. and Engineering, 1977, 63: 4013. SA Jun, TANG Hong-Qing, ZHOU Zu-Ying et al. Atomic Energy Sci. and Tech., 1992, 26: 1(in Chinese)(撒骏,唐洪庆,周祖英等.原子能科学技术,1992,26: 1)4. QI Bu-Jia, TANG Hong-Qing, ZHOU Zu-Ying et al. Chi-nese J. of Nucl. Phys., 1992, 14: 1475. TANG Hong-Qing, QI Bu-Jia, ZHOU Zu-Ying et al. Proc.Int. Symp. on Fast Neutron Physics, Beijing/PR China,Singapore: World Scientific Publishing Co., 1992, 32-45,Edited by Sun Zu-Xun et al.6. QI Bu-Jia, TANG Hong-Qing, ZHOU Zu-Ying et al.Atomic Energy Sci. and Tech., 1999, 33: 497(in Chinese)(祁步嘉,唐洪庆,周祖英等.原子能科学技术,1999, 33: 497)7. Dankwart Schmidt, ZHOU Zu-Ying, RUAN Xi-Chao etal. Nuclear Instruments and Methods in Physics Research,2005, A545: 658-6828. Dankwart Schmidt, Siebert B R L. Report PTB-N-40, PTB Braunschweig/Germany, 20009. CHEN Guo-Chang. Measurement and Evaluation of Neu-tron Emission Double Di erential Cross Section for 6;7LiInduced by Fast Neutrons. Master Thesis for Master of Sci-ence, CIAE, 2005(in Chinese)(陈国长.快中子引起反应的次级中子双微分截面测量与评价.硕士论文,中国原子能科学研究院,2005)10. ZHANG Jing-Shang, HAN Yin-Lu, CAO Li-Gang. Sci.Eng., 1999, 133: 218-23411. ZHANG Jing-Shang. INDC(CRP)-049/L, Commun. Nucl.Data Progress, 1999, 22: 112. ZHANG Jing-Shang. INDC(CRP)-050/L, Commun. Nucl.Data Progress, 2000, 23: 1413. ZHANG Jing-Shang, HAN Yin-Lu et al. Commun. Theor.Phys., 2001, 35: 57914. ENDF-102 Data Formats and Procedures for the EvaluatedNuclear Data File ENDF-6, BNL-NCS-44945-01/04-Rev.Informal Report, Edited by V.Mclane15. Hogue H H, von Behren P L, Epperson D H et al. Nucl.Sci. and Engineering, 1978, 68: 3816. Sugimoto M, Guenther P, Lynn J et al. Nucl. Sci. and En-gineering, 1989, 103: 3717. Boerker G, Boettger R, Brede H J et al. Report PTB-N-1,PTB Braunschweig/Germany, 1989

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RUAN Xi-Chao, ZHOU Zu-Ying, CHEN Guo-Chang, QI Bu-Jia, LI Xia, HUANG Han-Xiong, ZHONG Qi-Ping, TANG Hong-Qing, JIANG Jing, XIN Biao, BAO Jie, CHEN Lin and ZHANG Jing-Shang. Measurements of Neutron Emission Spectra for Neutron Induced Reactions on 9Be and 6,7Li[J]. Chinese Physics C, 2007, 31(5): 442-447.
RUAN Xi-Chao, ZHOU Zu-Ying, CHEN Guo-Chang, QI Bu-Jia, LI Xia, HUANG Han-Xiong, ZHONG Qi-Ping, TANG Hong-Qing, JIANG Jing, XIN Biao, BAO Jie, CHEN Lin and ZHANG Jing-Shang. Measurements of Neutron Emission Spectra for Neutron Induced Reactions on 9Be and 6,7Li[J]. Chinese Physics C, 2007, 31(5): 442-447. shu
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Received: 2006-08-11
Revised: 2006-10-15
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Measurements of Neutron Emission Spectra for Neutron Induced Reactions on 9Be and 6,7Li

    Corresponding author: RUAN Xi-Chao,
  • China Institute of Atomic Energy, Beijing 102413, China
  • Received Date: 2006-08-11
  • Accepted Date: 2006-10-15
  • Available Online: 2007-05-05

Abstract: The neutron emission double-differential cross sections(DDXs) of n+9Be and 6,7Li were measured at incident neutron energies of 8.17 and 10.27MeV. At 10.27MeV, the influence of breakup source neutrons from D(d, np) reactions was eliminated by using the combination of abnormal and normal fast neutron TOF spectrometers. The measured TOF spectra were analyzed by detailed Monte-Carlo simulation and the DDXs were determined by comparing the measured TOF spectra with simulated ones. The cross sections were normalized to n-p(normal geometry measurement) or n-C(abnormal geometry measurement) scattering measurement. The measured results were compared with the evaluations and the other measurements. A theoretical model based on the Hauser-Feshbach and exciton model for light nuclei was used to describe the double-differential cross sections of n+6,7Li. Good agreement between theoretical calculation and measurement has been obtained.

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