Superheavy Fragments Produced in the Asymmetric Strongly Damped Collision

Jun-Long Tian<SUP></SUP>; WU Xi-Zhen<SUP></SUP>; LI Zhu-Xia<SUP></SUP>; ZHAO Kai<SUP></SUP>

doi:10.1088/1674-1137/32/1/008

Chinese Physics C> 2008, Vol. 32> Issue(1) : 34-39 DOI: 10.1088/1674-1137/32/1/008

Superheavy Fragments Produced in the Asymmetric Strongly Damped Collision

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The strongly damped collisions of very heavy nuclei 232Th+250Cf at energy range of 800-2000 MeV have been studied within the improved quantum molecular dynamics model. The production probability of primary superheavy fragments with Z greater than and equal to 114 for the asymmetric reaction 232Th+250Cf is higher than that for the symmetric reaction 244Pu+244Pu and 238U+238U. The calculated results show that the mass and charge distributions of primary fragments, the excitation energy distribution of SHFs depend on incident energies strongly. Two stages of the decay process of composite systems are distinguished by very different decay slopes , which imply different decay mechanism of the composite system. The first stage is for the decay of giant composite systems and the second one is corresponding to the decay of fragments of giant composite systems including SHFs through emitting neutron, proton or other charged particles, and also through fission or fragmentation. The slow reduction of SHFs in the second stage seems to be helpful for the survival of primary superheavy fragments

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Jun-Long Tian, WU Xi-Zhen, LI Zhu-Xia and ZHAO Kai. Superheavy Fragments Produced in the Asymmetric Strongly Damped Collision[J]. Chinese Physics C, 2008, 32(1): 34-39. doi: 10.1088/1674-1137/32/1/008

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Received: 2007-02-25
Revised: 2007-05-29

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Superheavy Fragments Produced in the Asymmetric Strongly Damped Collision

Corresponding author: Jun-Long Tian,

Received Date: 2007-02-25

Accepted Date: 2007-05-29

Available Online: 2008-01-05

Abstract: The strongly damped collisions of very heavy nuclei 232Th+250Cf at energy range of 800-2000 MeV have been studied within the improved quantum molecular dynamics model. The production probability of primary superheavy fragments with Z greater than and equal to 114 for the asymmetric reaction 232Th+250Cf is higher than that for the symmetric reaction 244Pu+244Pu and 238U+238U. The calculated results show that the mass and charge distributions of primary fragments, the excitation energy distribution of SHFs depend on incident energies strongly. Two stages of the decay process of composite systems are distinguished by very different decay slopes , which imply different decay mechanism of the composite system. The first stage is for the decay of giant composite systems and the second one is corresponding to the decay of fragments of giant composite systems including SHFs through emitting neutron, proton or other charged particles, and also through fission or fragmentation. The slow reduction of SHFs in the second stage seems to be helpful for the survival of primary superheavy fragments

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Superheavy Fragments Produced in the Asymmetric Strongly Damped Collision

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