负热容和核的一阶相变

IF 3.2 2区物理与天体物理 Q2 PHYSICS, NUCLEAR

Physical Review C Pub Date : 2002-08-06 DOI:10.1103/PhysRevC.66.041601

L. Moretto, J. B. Elliott, L. Phair, G. Wozniak

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引用次数: 34

摘要

异常负热容通常被认为是有限系统中一阶相变的指标，特别是核系统。允许所有q值项的热力学方法被用来评估在共存区域有限范德华流体和有限晶格系统的热容。当引入周期边界条件时，在晶格系统中观察到虚拟的大效应和负热容。对于小滴和有限晶格系统，预测了微小的异常效应。将该分析直接应用于原子核表明，Ag60不能观察到负热容

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Negative heat capacities and first order phase transitions in nuclei

Anomalous negative heat capacities have been claimed as indicators of first-order phase transitions in finite systems in general, and for nuclear systems in particular. A thermodynamic approach allowing for all Q-value terms is used to evaluate heat capacities in finite van der Waals fluids and finite lattice systems in the coexistence region. Fictitious large effects and negative heat capacities are observed in lattice systems when periodic boundary conditions are introduced. Small anomalous effects are predicted for small drops and for finite lattice systems. A straightforward application of the analysis to nuclei shows that negative heat capacities cannot be observed for $Ag60.$

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来源期刊

Physical Review C PHYSICS, NUCLEAR-

CiteScore

5.80

自引率

35.50%

发文量

863

期刊介绍： Physical Review C (PRC) is a leading journal in theoretical and experimental nuclear physics, publishing more than two-thirds of the research literature in the field. PRC covers experimental and theoretical results in all aspects of nuclear physics, including: Nucleon-nucleon interaction, few-body systems Nuclear structure Nuclear reactions Relativistic nuclear collisions Hadronic physics and QCD Electroweak interaction, symmetries Nuclear astrophysics