Institute of Modern Physics, Chinese Academy of Sciences Direct Breakup Reaction of 8 B,J.S.Wang S.L.Jin et al DIRECT BREAKUP RECTIONS OF 8 B AT FERMI ENERGY Jian-Song Wang, Shi-Lun Jin et al., Institute of Modern Physics, Chinese Academy of Sciences
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Institute of Modern Physics, Chinese Academy of Sciences Direct Breakup Reaction of 8B,J.S.Wang S.L.Jin et al
DIRECT BREAKUP RECTIONS OF 8B AT FERMI ENERGY
Jian-Song Wang, Shi-Lun Jin et al.,
Institute of Modern Physics,
Chinese Academy of Sciences
Institute of Modern Physics, Chinese Academy of Sciences Direct Breakup Reaction of 8B,J.S.Wang S.L.Jin et al
Institute of Modern Physics, Chinese Academy of Sciences Direct Breakup Reaction of 8B,J.S.Wang S.L.Jin et al
Theoretical Calculations-Stripping
2016/9/12 International Nuclear Physics Conference 2016 23
Calculation done by Prof. J. A. Tostevin
The stripping momentum distributions were
calculated using the eikonal approximation formalism
(PRC70, 034609) and the eikonal phase shifts and S-
matrices of the following potentials (denoted KDe)
The complex 7Be-target optical potential was
calculated using the double-folding method of
PRC74,064604, assuming Gaussian 7Be and 12C densities
of rms radii 2.31and 2.32 fm. The proton-target potential
was calculated from the Koning and Delaroche global
parameterization (NPA713, 231)
In addition, due to the relatively low beam energy,
calculations were repeated using the improved
description of the proton-target S-matrix (denoted KDp).
The 8B(g.s.) to 7Be final state radial overlapsand spectroscopic factors were taken fromPRL102,232501
Institute of Modern Physics, Chinese Academy of Sciences Direct Breakup Reaction of 8B,J.S.Wang S.L.Jin et al
Theoretical Calculations-Diffraction
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The diffraction mechanism differential cross sections were calculated using a CDCC
(Coupled Discretized Continuum Channels) breakup model space as PRL102,232501,
and the resulting momentum distributions constructed by integration over the solid angles
covered by the current detection system, as is discussed in Phys. Rev. C 66, 024607.
Calculation done by Prof. J. A. Tostevin
Institute of Modern Physics, Chinese Academy of Sciences Direct Breakup Reaction of 8B,J.S.Wang S.L.Jin et al
A summary of width calculated in different model
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The experimental data show the width of longitudinal momentum distribution for
stripping breakup is obviously wider than diffraction breakup.
85±4 8B@41AMeV PRL77(1996)5020
Institute of Modern Physics, Chinese Academy of Sciences Direct Breakup Reaction of 8B,J.S.Wang S.L.Jin et al
Summary and Outlook
• The longitudinal momentum distributions of 7Be have beenmeasured for the breakup of 8B at 36 MeV/u at RIBLL1.
• Longitudinal momentum distributions for both stripping anddiffraction mechanisms have been obtained by a coincidencetechnique.
• The present experimental data show a marginal difference of thelongitudinal momentum distributions between stripping anddiffraction.
• Further studies of 8B are needed both experimentally andtheoretically.
2016/9/12 International Nuclear Physics Conference 2016 26
Institute of Modern Physics, Chinese Academy of Sciences Direct Breakup Reaction of 8B,J.S.Wang S.L.Jin et al
Collaborators
IMP: Y. Y. Yang(杨彦云),P. Ma(马朋),M. R. Huang(黄美容),J. B. Ma(马军兵),F.Fu(付芬),Q. Wang(王琦),M. Wang(王猛),Z. Y. Sun (孙志宇),Z.G.Hu(胡正国),R. F.Chen(陈若富),X. Y. Zhang(张雪荧),X. H. Yuan(袁小华),X. L. Tu (涂小林),Z. G. Xu(徐治国),K. Yue(岳珂),J. D. Chen(陈金达),B. Tang(唐彬),Y. D. Zang(臧永东),D. P.Wu(武大鹏),Q. Hu(胡强),Z. Bai(白真),Y. J. Zhou(周远杰),W. H. Ma(马维虎),J.Chen(陈杰),Y. H. Zhang(张玉虎),H. S. Xu(徐瑚珊) and G. Q. Xiao(肖国青)
Nanjing Univ.:Z. Z. Ren(任中洲),C. Xu(许昌),D. D. Ni(倪冬冬)
CIAE:C. J. Lin(林承键),X. X. Xu(徐新星)
Surrey Univ.: J. A. Tostevin
Grateful to George Bertsch, Carlos Bertulani, and Henning Esbensen for informative discussions
272016/9/12 International Nuclear Physics Conference 2016
Institute of Modern Physics, Chinese Academy of Sciences Direct Breakup Reaction of 8B,J.S.Wang S.L.Jin et al
2016/9/12 International Nuclear Physics Conference 2016 28