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Chinese Physics C> 2000, Vol. 24> Issue(1) : 35-40 

Space-Time Evolution of Projectile-Like Fragment Emission for 40Ar +natAg Reaction at 30MeV/u

  •  Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China

  • The emission time of intermediate mass fragments (IMF) has been studied as a function of spatial evolution of the emission source for 40Ar+natAg reaction at 30MeV/u, and the spatial-time evolution of projectile-like fragments emission has also been discussed. The investigation for spatial-time evolution of the reaction system shows that the emission time of the IMF mainly depends on the correlation functions and the density of nuclear matter, and that it is not sensitive to the mass number of emitting sources. For high-energy fragments, a smaller nuclear density would lead to a smaller assignment for emission time τ; therefor the τ values extracted from the normal nuclear density could be taken as upper limits of real τ values. For the mid-velocity fragments, their emission times do not change with size of the source and these τ values could be taken as the real values directly.
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  • References

    [1] Kim Y D et al. Phys. Rev., 1992, C45:338–352 2 De Souza et al. Phys. Lett., 1991, B268:6–113 Bowman D R et al. Phys. Rev. Lett., 1991, 67: 1527–1530 4 LI ZuYu et al. Nuclear Techniques. (in Chinese), 1995, 18(3): 148–151(李祖玉等.核技术,1995,18(3):148–151)5 LI ZuYu et al. Nuclear Techniques. (in Chinese), 1998, 21(1): 11–15(李祖玉等.核技术,1998,21(1):11–15) 6 Elmaani A et al. Nucl. Instr. Meth., 1992, A313:401–412 7 LI ZuYu et al. High Energy Physics and Nuclear Physics (in Chinese), 1998, 22(8):684–689(李祖玉等.高能物理与核物理,1998,22(8):684–689)8 HE ZhiYong et al. Acta Physica Sinica, 1997, 46(7): 1312–1318 9 HE ZhiYong et al. High Energy Physics and Nuclear Physics (in Chinese), 1998, 22(8):678–683(贺智勇等.高能物理与核物理, 1998, 22(8): 678–683)10 HE ZhiYong et al. Acta Physica Sinica, 1998, 47(6): 916–921

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WANG HongWei, LI ZuYu, HE ZhiYong, DUAN LiMin, ZHANG BaoGuo, FU YanBiao, JIN GenMing, WU HeYu and DAI GuangXi. Space-Time Evolution of Projectile-Like Fragment Emission for 40Ar +natAg Reaction at 30MeV/u[J]. Chinese Physics C, 2000, 24(1): 35-40.
WANG HongWei, LI ZuYu, HE ZhiYong, DUAN LiMin, ZHANG BaoGuo, FU YanBiao, JIN GenMing, WU HeYu and DAI GuangXi. Space-Time Evolution of Projectile-Like Fragment Emission for 40Ar +natAg Reaction at 30MeV/u[J]. Chinese Physics C, 2000, 24(1): 35-40. shu
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Received: 1998-11-11
Revised: 1900-01-01
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Space-Time Evolution of Projectile-Like Fragment Emission for 40Ar +natAg Reaction at 30MeV/u

    Corresponding author: WANG HongWei,
  • Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China
  • Received Date: 1998-11-11
  • Accepted Date: 1900-01-01
  • Available Online: 2000-01-05

Abstract: The emission time of intermediate mass fragments (IMF) has been studied as a function of spatial evolution of the emission source for 40Ar+natAg reaction at 30MeV/u, and the spatial-time evolution of projectile-like fragments emission has also been discussed. The investigation for spatial-time evolution of the reaction system shows that the emission time of the IMF mainly depends on the correlation functions and the density of nuclear matter, and that it is not sensitive to the mass number of emitting sources. For high-energy fragments, a smaller nuclear density would lead to a smaller assignment for emission time τ; therefor the τ values extracted from the normal nuclear density could be taken as upper limits of real τ values. For the mid-velocity fragments, their emission times do not change with size of the source and these τ values could be taken as the real values directly.

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