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Chinese Physics C> 1990, Vol. 14> Issue(7) : 629-634 

FISSION MEASUREMENT ON 5.5 TO 21.7MeV/A 28Si+197Au SYSTEM (Ⅰ) LINEAR MOMENTUM TRANSFER AND DISTRIBUTION OF OUT-OF-REACTION PLANE

  •  Institute of Modern Physics,Academia Sinica,Lanzhou1 Lawrence Berkeley Laboratory,Berkeley,California,CA-94720,U.S.A

  • The velocities and angular distributions of fission partner emitted from reaction in 28Si+197Au system with energies from 5.5 up to 21.7MeV/A are measured.These results show that when the in cident energies are larger than 10MeV/A,the in complete fusion-fission (ICF) associated with in-complete momentum transfer (LMT) appears.Furthermore,when Ecm>200MeV,as a companion of ICF,the sequential fission (SF) with lower LMT than that of ICF,has apparent yields.By the difference of LMT for ICF and SF over total fission cross-section has been obtained.Meanwhile,the distribution around the reaction plane of one fragment with a standard deviation has been obtained.It seems that there is a simple linear global relationship between the deviation and excitation energy per nucleon in heavier composite systems.
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    [1] N.Mostefa et al., J. Phys. Collcque, C4, supp. 47 (1986), 361.[2] C.K. Gelbke et al.,MSUCL-584, 1986.[3] J.Toke, B. Bock. G.Dai et al., Nucl. Phys., A440(1985), 327.[4] G. Dai et al，Proc. of Tsukuba Int. Symp. on HI Fusion Reaction 1984. 205[5] L. G. Tsang et al，Phys. Lett., 134B(1984), 169.[6] J. Tang, X. Liu et al., Nucl. Elect. Det. Tech., 8(1988),145[7] J, Randrup et al., Nucl. Phys., A429 (1984). 105.[8] W. Shen et al., Phys. Rev., C36 (1987), 115.[9] G. La. Rana et al ，Nucl. Phys., A407 (1983), 233.[10] U. Jahnke et al., J. Phys. Colleque, C4, supp. 47 (1986), 317.

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DAI Guang-Xi, QI Yu-Jin, ZHENG Ji-Wen, LIU Xi-Ming and FISSION MEASUREMENT ON 5.5 TO 21.7MeV/A 28Si+197Au SYSTEM (Ⅰ) LINEAR MOMENTUM TRANSFER AND DISTRIBUTION OF OUT-OF-REACTION PLANE[J]. Chinese Physics C, 1990, 14(7): 629-634.
DAI Guang-Xi, QI Yu-Jin, ZHENG Ji-Wen, LIU Xi-Ming and FISSION MEASUREMENT ON 5.5 TO 21.7MeV/A 28Si+197Au SYSTEM (Ⅰ) LINEAR MOMENTUM TRANSFER AND DISTRIBUTION OF OUT-OF-REACTION PLANE[J]. Chinese Physics C, 1990, 14(7): 629-634. shu
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Received: 1900-01-01
Revised: 1900-01-01
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FISSION MEASUREMENT ON 5.5 TO 21.7MeV/A 28Si+197Au SYSTEM (Ⅰ) LINEAR MOMENTUM TRANSFER AND DISTRIBUTION OF OUT-OF-REACTION PLANE

    Corresponding author: DAI Guang-Xi,
  • Institute of Modern Physics,Academia Sinica,Lanzhou1 Lawrence Berkeley Laboratory,Berkeley,California,CA-94720,U.S.A
  • Received Date: 1900-01-01
  • Accepted Date: 1900-01-01
  • Available Online: 1990-07-05

Abstract: The velocities and angular distributions of fission partner emitted from reaction in 28Si+197Au system with energies from 5.5 up to 21.7MeV/A are measured.These results show that when the in cident energies are larger than 10MeV/A,the in complete fusion-fission (ICF) associated with in-complete momentum transfer (LMT) appears.Furthermore,when Ecm>200MeV,as a companion of ICF,the sequential fission (SF) with lower LMT than that of ICF,has apparent yields.By the difference of LMT for ICF and SF over total fission cross-section has been obtained.Meanwhile,the distribution around the reaction plane of one fragment with a standard deviation has been obtained.It seems that there is a simple linear global relationship between the deviation and excitation energy per nucleon in heavier composite systems.

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