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Chinese Physics C> 1995, Vol. 19> Issue(7) : 585-590 

Anomaly Observed in Subbarrier Fusion-Fission Reactions

  •  China Institute of Atomic Energy, Beijing, 102413

  • The fusion-fission cross sections and fragment angular distributions for the systems of 16O＋232Th, 16O＋238U and 19F＋232Th at near-and sub-barrier energies have been measured. The enhancement of fusion-fission cross sections at subbarrier energies is well explained in the framework of coupled-channels theory in which the target static deformations are explicitly taken into account. However, the experimental fragment anisotropies obviously deviate from the predictions of the statistic fission model.
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    [1] C.Y.Wong,Phys.Rev.Lett.,31（1973）766.[2]H.Esbensen,Nucl.Phys.,A352（1981）147.[3]C.H.DassoandS.Landowne,Comp.Phys.Comm.,46（1987）187.[4]P.H.Stelson;Phys.Lett,B205（1988）190.[5]R.Vandenboschetal,Phys.Rev.Lett,56（1986）1234.[6]H.Q.Zhany,J.C.Xu,Z.H.Liuetal,Phys.Lett,B218（1989）133.[7]R.Vandenbosch and J.R.Huizenga,Nuclear Fission（AcademicPress,NewYork,1973）.[8]P.D.Bond,Phys.Rev.,C32（1985）471.[9]H.Q.Zhang,Z.H.Liu,J.C.Xuetal,Phys.Rev.,C49（1994）926.[10]A.J.Sierk,Phys.Rev.,C33（1986）2039.[11]H.Rossner,D.J.Hind,J.R.Leighetal.,Phys.Rev.,C45（1992）719.[12]B.B.Back,R.R.Betts,P.Fernandez et al,Fission at subbarrier energies,The Sixth Winter Workshop On Nuclear Dynamics,Jackson Hole,Wyoming,USA（1990）.[13]V.E.Viola,K.Kwiakowski and M.Walker,Phys.Rev,C31（1985）1550.[14]B.B.Back,R.R.Betts,J.E.Gindleretal,Phys.Rev.,C32（1985）195.

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Liu Zuhua, Zhang Huanqiao, Xu Jincheng, Qian Xing, Qiao Yu, Lin Chengjian and Xu Kan. Anomaly Observed in Subbarrier Fusion-Fission Reactions[J]. Chinese Physics C, 1995, 19(7): 585-590.
Liu Zuhua, Zhang Huanqiao, Xu Jincheng, Qian Xing, Qiao Yu, Lin Chengjian and Xu Kan. Anomaly Observed in Subbarrier Fusion-Fission Reactions[J]. Chinese Physics C, 1995, 19(7): 585-590. shu
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Received: 1900-01-01
Revised: 1900-01-01
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Anomaly Observed in Subbarrier Fusion-Fission Reactions

    Corresponding author: Liu Zuhua,
  • China Institute of Atomic Energy, Beijing, 102413
  • Received Date: 1900-01-01
  • Accepted Date: 1900-01-01
  • Available Online: 1995-07-05

Abstract: The fusion-fission cross sections and fragment angular distributions for the systems of 16O＋232Th, 16O＋238U and 19F＋232Th at near-and sub-barrier energies have been measured. The enhancement of fusion-fission cross sections at subbarrier energies is well explained in the framework of coupled-channels theory in which the target static deformations are explicitly taken into account. However, the experimental fragment anisotropies obviously deviate from the predictions of the statistic fission model.

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