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Competition between fusion-fission and quasifission in 32 S+ 184 W reaction

Competition between fusion-fission and quasifission in 32 S+ 184 W reaction. Huanqiao Zhang China Institute of Atomic Energy. Collaborators. China Institute of Atomic Energy C. L. Zhang, C. J. Lin, Z. H. Liu, F. Yang JINR, Dubna, Russia A. K. Nasirov Universit à di Messina, Italy

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Competition between fusion-fission and quasifission in 32 S+ 184 W reaction

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  1. Competition between fusion-fission and quasifission in 32S+184W reaction Huanqiao Zhang China Institute of Atomic Energy

  2. Collaborators China Institute of Atomic Energy C. L. Zhang, C. J. Lin, Z. H. Liu, F. Yang JINR, Dubna, Russia A. K. Nasirov Università di Messina, Italy G. Mandaglio, M. Manganaro, G. Giardina

  3. Outline： Ⅰ．Introduction Ⅱ．Experiment Procedure Ⅲ．Experiment result Ⅳ. Compare with theory calculation Ⅴ. Conclusion

  4. Chart of the Nuclides at High Z End LogT LogT LogT LogT 1/2 1/2 1/2 1/2 (sec) (sec) (sec) (sec) 14 14 14 14 120 120 120 120 Proton number 10 10 10 10 110 110 110 110 6 6 6 6 100 100 100 100 2 2 2 2 90 90 90 90 - - - - 2 2 2 2 80 80 80 80 - - - - 6 6 6 6 70 70 70 70 110 110 110 110 150 150 150 150 170 170 170 170 100 100 100 100 130 130 130 130 190 190 190 190 120 120 120 120 140 140 140 140 160 160 160 160 180 180 180 180 Neutron number Neutron number Neutron number Neutron number Ⅰ．Introduction Proton number

  5. QF DNS T P SF CN ER

  6. Ⅱ．Experiment Procedure HI-13 tandem accelerator at CIAE

  7. Experimental setup Si detectoes Monitors 150 Si strips Beam: 32S; Target: 184W EnergyLab: 140，145，150，155, 160，165，170MeV.

  8. Energy and angle calculation V.E.Viola et,al PRC 31,1550(1985)

  9. The detector position

  10. 32S+184W ELab=170MeV θLab=54.850 elastic Ⅲ．Experiment result

  11. 32S+184W ELab=165MeV Angle: 690---760 DF03：64.840 Position 32S+184W ELab=170MeV Angle: 69.020---760 DF01：54.850 Energy

  12. 32S+184W ELab=170MeV Angle: 88.90---96.490 DF01：54.850 Energy 32S+184W ELab=170MeV Angle: 76.90---83.980 DF01：54.850 Fission production folding angle

  13. Gaussian fit

  14. Ⅳ. Compare with theory calculation

  15. Ⅴ. Conclusion An increase of the hindrance to complete fusion at large beam energies : the dependence of the quasifission and intrinsic fusion barriers of dinuclear system on its angular momentum. The maximal value of the total cross section of the evaporation residue is 0.12 mb and fusion-fission cross section is comparable with the quasifission cross section. The effects of competition between fusion and quasifission in the reaction play an important role in the dynamics process.

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