Probing the nuclear liquid-gas phase transition.
Probing the nuclear liquid-gas phase transition.
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DOI：
10.1103/physrevlett.75.1040
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发表时间：
1995-08
影响因子：
8.6
通讯作者：
J. Pochodzalla;T. Möhlenkamp;T. Rubehn;A. Schüttauf;A. Wörner;E. Zude;M. Begemann-Blaich;T. Blaich-T
中科院分区：
文献类型：
--
作者：
J. Pochodzalla;T. Möhlenkamp;T. Rubehn;A. Schüttauf;A. Wörner;E. Zude;M. Begemann-Blaich;T. Blaich-T
本文研究了入射能量为{italE}/{italA}=600 MeV时Au+Au碰撞的碎片分布。从测得的碎片和中子分布的质量和激发能量的衰减prefragments确定。根据He和Li同位素的产额比，导出了一个温标。该同位素温度与系统的激发能之间的关系表现出相变所预期的行为。核蒸气区在激发能为10 MeV/核子，温度为5 MeV时开始，其特征是密度为0.15- 0.3正常核密度。
Fragment distributions resulting from Au+Au collisions at an incident energy of {ital E}/{ital A}=600 MeV are studied. From the measured fragment and neutron distributions the mass and the excitation energy of the decaying prefragments were determined. A temperature scale was derived from observed yield ratios of He and Li isotopes. The relation between this isotope temperature and the excitation energy of the system exhibits a behavior which is expected for a phase transition. The nuclear vapor regime takes over at an excitation energy of 10 MeV per nucleon, a temperature of 5 MeV, and may be characterized by a density of 0.15--0.3 normal nuclear density.