Nuclear matter symmetry energy at 0.03 ≤ ρ/ρ0 ≤ 0.2

被引：52

作者：

Wada, R. ^{[1
,2
]}

Hagel, K. ^{[2
]}

Qin, L. ^{[2
]}

Natowitz, J. B. ^{[2
]}

Ma, Y. G. ^{[3
]}

Roepke, G. ^{[4
]}

Shlomo, S. ^{[2
]}

Bonasera, A. ^{[2
,5
]}

Typel, S. ^{[6
]}

Chen, Z. ^{[1
,2
]}

Huang, M. ^{[1
,2
]}

Wang, J. ^{[1
,2
]}

Zheng, H. ^{[2
]}

Kowalski, S. ^{[7
]}

Bottosso, C. ^{[2
]}

Barbui, M. ^{[2
]}

Rodrigues, M. R. D. ^{[2
]}

Schmidt, K. ^{[2
]}

Fabris, D. ^{[8
,9
]}

Lunardon, M. ^{[8
,9
]}

Moretto, S. ^{[8
,9
]}

Nebbia, G. ^{[8
,9
]}

Pesente, S. ^{[8
,9
]}

Rizzi, V. ^{[8
,9
]}

Viesti, G. ^{[8
,9
]}

Cinausero, M. ^{[10
]}

Prete, G. ^{[10
]}

Keutgen, T. ^{[11
,12
]}

El Masri, Y. ^{[11
,12
]}

Majka, Z. ^{[13
]}

机构：

[1] Chinese Acad Sci, Inst Modern Phys HIRFL, Lanzhou 730000, Peoples R China

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

[3] Chinese Acad Sci, Shanghai Inst Nucl Res, Shanghai 201800, Peoples R China

[4] Univ Rostock, FB Phys, D-18051 Rostock, Germany

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

[6] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany

[7] Silesia Univ, Inst Phys, PL-40007 Katowice, Poland

[8] Univ Padua, Dipartamento Fis, I-35131 Padua, Italy

[9] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

[10] Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy

[11] Catholic Univ Louvain, FNRS, B-1348 Louvain, Belgium

[12] Catholic Univ Louvain, IPN, B-1348 Louvain, Belgium

[13] Jagiellonian Univ, Smoluchowski Inst Phys, PL-30059 Krakow, Poland

来源：

PHYSICAL REVIEW C | 2012年 / 85卷 / 06期

关键词：

PARTICLE-EMISSION; TEMPERATURE; DENSITY;

D O I：

10.1103/PhysRevC.85.064618

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：

Measurements of the density dependence of the symmetry free energy in low-density clustered matter have been extended using the Neutron Ion Multidetector for Reaction Oriented Dynamics at Texas A&M University. Thermal coalescence models were employed to extract densities rho and temperatures T for evolving systems formed in collisions of 47A MeV Ar-40 + Sn-112, Sn-124 and Zn-64 + Sn-112, Sn-124. Densities of 0.03 <= rho/rho(0) <= 0.2 and temperatures in the range 5-10 MeV have been sampled. The symmetry free energy coefficients are found to be in good agreement with values calculated using a quantum statistical model. Values of the corresponding symmetry free energy coefficient are derived from the data using entropies derived from the model.

引用

页数：6

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