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

Anomaly Observed in Subbarrier Fusion-Fission Reactions

China Institute of Atomic Energy, Beijing, 102413

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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.

References

[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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[18]	DAI Guang-Xi,QI Yu-Jin,ZHENG Ji-Wen,LIU Xi-Ming,,. INCOMPLETE AND SEQUENTIAL FISSION IN²⁸Si+²³⁸U SYSTEMS. Chinese Physics C, 1990, 14(10): 912-918.
[19]	CHEN Ke-Liang,LIU Guo-Xing,ZHENG Ji-Wen,WANG Su-Fang,FAN Zhi-Guo. MEASUREMENTS OF ANGULAR MOMENTUM EFFECT OF FISSION BARRIER. Chinese Physics C, 1988, 12(5): 658-664.
[20]	LIU GUO-XING,CHEN KE-LIANG,MA HONG-FAN,WANG SU-FANG,CAI WEI. DIRECT DETERMINATION OF THE COMPLETE FUSION CROSS SECTIONS FROM THE FISSION FRAGMENT ANGULAR DISTRIBUTION. Chinese Physics C, 1982, 6(6): 737-742.

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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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沈阳化工大学材料科学与工程学院沈阳 110142

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 of¹⁶O＋²³²Th,¹⁶O＋²³⁸U and¹⁹F＋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.