Quantum nature of a nuclear phase transition.
Quantum nature of a nuclear phase transition.
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DOI：
10.1103/physrevlett.101.122702
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发表时间：
2008-03
影响因子：
8.6
通讯作者：
A. Bonasera;Z. Chen;R. Wada;K. Hagel;J. Natowitz;P. Sahu;L. Qin;S. Kowalski;T. Keutgen;T. Materna;T. Nakagawa
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文献类型：
--
作者：
A. Bonasera;Z. Chen;R. Wada;K. Hagel;J. Natowitz;P. Sahu;L. Qin;S. Kowalski;T. Keutgen;T. Materna;T. Nakagawa
在有限的温度和低密度下，原子核可能经历类似于经典的液-气相转变的相变。温度是控制参数，而密度和压力是共轭变量。在原子核中，质子和中子浓度之差作为一个额外的序参量，对称势是它的共轭变量。我们提出的实验结果，揭示了N/Z的相变依赖性，并讨论了这些意见的朗道自由能描述的临界现象方面可能的影响。
At finite temperatures and low densities, nuclei may undergo a phase change similar to a classical liquid-gas phase transition. Temperature is the control parameter while density and pressure are the conjugate variables. In the nucleus the difference between the proton and neutron concentrations acts as an additional order parameter, for which the symmetry potential is the conjugate variable. We present experimental results which reveal the N/Z dependence of the phase transition and discuss possible implications of these observations in terms of the Landau free energy description of critical phenomena.