Investigation of the nuclear phase transition using the Landau free-energy approach

被引：11

作者：

Mabiala, J. ^{[1
]}

Bonasera, A. ^{[1
,2
]}

Zheng, H. ^{[1
,3
]}

McIntosh, A. B. ^{[1
]}

May, L. W. ^{[1
,4
]}

Cammarata, P. ^{[1
,4
]}

Kohley, Z. ^{[1
,4
]}

Hagel, K. ^{[1
]}

Heilborn, L. ^{[1
,4
]}

Raphelt, A. ^{[1
,4
]}

Souliotis, G. A. ^{[1
,5
]}

Zarrella, A. ^{[1
,4
]}

Yennello, S. J. ^{[1
,4
]}

机构：

[1] Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA

[2] Ist Nazl Fis Nucl, Lab Nazl Sud, I-95123 Catania, Italy

[3] Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA

[4] Texas A&M Univ, Dept Chem, College Stn, TX 77843 USA

[5] Natl & Kapodistrian Univ Athens, Dept Chem, Phys Chem Lab, GR-15771 Athens, Greece

来源：

PHYSICAL REVIEW C | 2013年 / 87卷 / 01期

关键词：

D O I：

10.1103/PhysRevC.87.017603

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Fragment yield data have been analyzed using the Landau free energy approach to investigate the critical phenomena of fragmenting quasi-projectiles formed in Zn-64 + Zn-64, Ni-64 + Ni-64, and Zn-70 + Zn-70 reactions at beam energy of 35 MeV/nucleon. Pairing coefficients normalized to the temperature of the fragmenting source (a(p)/T) were extracted from yield data of N = Z fragments in order to correct for odd-even effects in free energy calculations. Plots of fragment free energy (F/T) versus the neutron-proton asymmetry show three minima, indicating the system to be in a first-order phase transition regime. Values of fitting parameters to the Landau free energy equation as well as a(p)/T, which are related to thermodynamic properties of the fragmenting systems, exhibit a dependence on the neutron-proton asymmetry in addition to their dependence on the excitation energy of the fragmenting source. DOI: 10.1103/PhysRevC.87.017603

引用

页数：4

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