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Chinese Physics C> 1992, Vol. 16> Issue(9) : 826-831 

Fission-Fragment Angular Distributions for the 16O+238U Near-and Sub-Barrier Fusion-Fission Reaction

  •  Institute of Atomic Energy,China,102413

  • Fission cross sections and angular distributions have been measured for the 16O+238U reaction at bombarding energies from 73.7 to 93.7 MeV.The fission excitation function is well reproduced on the basis of Wong model.The fission-fragment angular distributions are calculated in terms of the transition-state theory,with the transmission coefficents extracted from the excitation function calculation.It is found that a discrepancy between the observations and the predictions in angular anisotropy of fission fragments exists at near-and sub-barrier energies.Moreover the tendency of the anistropies as a function of the center-of-mass energy aren't the same as previous measurement results.
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    [1] M. Beckerman, Phys. Rep., B129(1985); 145.[2] R. Vandenbosch et al., Phys. Rev., C26(1983), 1161.[3] T. Murakami et al., Phys. Rev., C34(1986), 1353.[4] R. G. Stokstad et al., Phys. Rev. Lett.,82(1989), 399.[5] D. E. Digregorio et al., Phys. Rev., C43(1991), 265.[6] R. Vandenbosch et al., Phys. Rev. Lett., 56(1986), 1234.[7] H. Zhang et al., Phys. Lett., B218(1989), 133.[8] B. B. Back et al., Phys. Rev., C32(1985), 195.[9] J. Toke et al., Phys. Lest., B142(1984),258.[10] W. O. Shen et al., Phys. Rev., C36(1987), 115.[11] 钱兴等，"84.OMe16V "O轰击238U核的裂变碎片角关联的测量'高能物理与核物理，待发表.

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ZHANG Huan-Qiao, LIU Zu-Hua, XU Jin-Cheng, RUAN Ming, QIAN Xing, XU Kan and LV Jun. Fission-Fragment Angular Distributions for the 16O+238U Near-and Sub-Barrier Fusion-Fission Reaction[J]. Chinese Physics C, 1992, 16(9): 826-831.
ZHANG Huan-Qiao, LIU Zu-Hua, XU Jin-Cheng, RUAN Ming, QIAN Xing, XU Kan and LV Jun. Fission-Fragment Angular Distributions for the 16O+238U Near-and Sub-Barrier Fusion-Fission Reaction[J]. Chinese Physics C, 1992, 16(9): 826-831. shu
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Received: 1900-01-01
Revised: 1900-01-01
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Fission-Fragment Angular Distributions for the 16O+238U Near-and Sub-Barrier Fusion-Fission Reaction

    Corresponding author: ZHANG Huan-Qiao,
  • Institute of Atomic Energy,China,102413
  • Received Date: 1900-01-01
  • Accepted Date: 1900-01-01
  • Available Online: 1992-09-05

Abstract: Fission cross sections and angular distributions have been measured for the 16O+238U reaction at bombarding energies from 73.7 to 93.7 MeV.The fission excitation function is well reproduced on the basis of Wong model.The fission-fragment angular distributions are calculated in terms of the transition-state theory,with the transmission coefficents extracted from the excitation function calculation.It is found that a discrepancy between the observations and the predictions in angular anisotropy of fission fragments exists at near-and sub-barrier energies.Moreover the tendency of the anistropies as a function of the center-of-mass energy aren't the same as previous measurement results.

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