| 中能重离子碰撞中的涨落和中间质量碎片发射的机制 |
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| 引用本文： | 张晓东,葛凌霄. 中能重离子碰撞中的涨落和中间质量碎片发射的机制[J]. 中国物理 C, 1995, 0(10) |
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| 作者姓名： | 张晓东 葛凌霄 |
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| 作者单位： | 中国科学院近代物理研究所 |
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| 基金项目： | 国家自然科学基金,中国科学院LWTZ－1298经费资助 |
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| 摘 要： | 在ＱＭＤ模型的基础上，系统研究了４０Ｃａ＋４０Ｃａ中心碰撞系统的中间质量碎片随能量和时间的演化以及它们的动力学起源．集中讨论了反应机制的跃迁，动力学过程中密度涨落和平均中间质量碎片的关系以及碎裂的时间尺度．发现中间质量碎片随能量的上升和下降伴随着涨落的上升和下降．并预言对所研究的反应，当入射能量为６５ＭｅＶ／ｕ时，彻底解体可能发生．碎裂的时间尺度大约为１４０ｆｍ／ｃ，且随能量的增大，此时间尺度不再减小，达到饱和．
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| 关 键 词： | 涨落，平均中间质量碎片，时间尺度，多重碎裂，彻底解体 |
Fluctuation and Emission of Intermediate Mass Fragments inHeavy Ion Collisions at Medium Energy |
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| Zhang Xiaodong,Ge Lingxiao. Fluctuation and Emission of Intermediate Mass Fragments inHeavy Ion Collisions at Medium Energy[J]. High Energy Physics and Nuclear Physics, 1995, 0(10) |
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| Authors: | Zhang Xiaodong Ge Lingxiao |
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| Abstract: | Based on the quantum molecular dynamics model, the time and energy evolutions of intermediate mass fragments (IMF)and its dynamical origin are systematically studied for 40Ca +40Ca central collision.The transition of reaction mechanism, the relation between the density fluctuation and IMF and the time scale of IMF emission are discussed in detail.The relative density fluctuation attains to maximum at energy region of 50-80MeV/u corresponding to an obvious increase of IMF. The possible occurrence of total disassembly at incident energy of about 65MeV/u for the studied reactions is predicted.Meanwhile, a saturation value (140fm/c) for time scale of multifragmentation is obtained. |
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| Keywords: | fluctuation intermediate mass fragments time scale Multifragmentation total disassembly. |
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