Neutron and proton transverse emission ratio measurements and the density dependence of the asymmetry term of the nuclear equation of state

被引：217

作者：

Famiano, M. A. ^{[1
]}

Liu, T.

Lynch, W. G.

Mocko, M.

Rogers, A. M.

Tsang, M. B.

Wallace, M. S.

Charity, R. J.

Komarov, S.

Sarantites, D. G.

Sobotka, L. G.

Verde, G.

机构：

[1] Western Michigan Univ, Dept Phys, Kalamazoo, MI 49008 USA

[2] Natl Superconducting Cyclotron Lab, E Lansing, MI USA

[3] Washington Univ, St Louis, MO USA

[4] Ist Nazl Fis Nucl, I-95129 Catania, Italy

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 05期

关键词：

D O I：

10.1103/PhysRevLett.97.052701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Recent measurements of preequilibrium neutron and proton transverse emission from Sn-112,Sn-124+Sn-112,Sn-124 reactions at 50 MeV/A have been completed at the National Superconducting Cyclotron Laboratory. Free nucleon transverse emission ratios are compared to those of A=3 mirror nuclei. Comparisons are made to Boltzmann-Uehling-Uhlenbeck (BUU) transport calculations and conclusions concerning the density dependence of the asymmetry term of the nuclear equation of state at subnuclear densities are made. Comparison to BUU model predictions indicate a density dependence of the asymmetry energy that is closer to a form in which the asymmetry energy increases as the square root of the density for the density region studied. A coalescent-invariant analysis is introduced as a means of reducing suggested difficulties with cluster emission in total nucleon emission.

引用

页数：4

共 20 条

[1] Effects of momentum-dependent nuclear potential on two-nucleon correlation functions and light cluster production in intermediate energy heavy-ion collisions [J].

Chen, LW ;

Ko, CM ;

Li, BA .

PHYSICAL REVIEW C, 2004, 69 (05) :054606-1

[2] LASSA: a large area silicon strip array for isotopic identification of charged particles [J].

Davin, B ;

de Souza, RT ;

Yanez, R ;

Larochelle, Y ;

Alfaro, R ;

Xu, HS ;

Alexander, A ;

Bastin, K ;

Beaulieu, L ;

Dorsett, J ;

Fleener, G ;

Gelovani, L ;

Lefort, T ;

Poehhman, J ;

Charity, RJ ;

Sobotka, LG ;

Elson, J ;

Wagner, A ;

Liu, TX ;

Liu, XD ;

Lynch, WG ;

Morris, L ;

Shomin, R ;

Tan, WP ;

Tsang, MB ;

Verde, G ;

Yurkon, J .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2001, 473 (03) :302-318

[3]

LATTIMER J, IN PRESS NUCL PHYS A

[4] Neutron star structure and the equation of state [J].

Lattimer, JM ;

Prakash, M .

ASTROPHYSICAL JOURNAL, 2001, 550 (01) :426-442

[5] Equation calf state of asymmetric nuclear matter and collisions of neutron-rich nuclei [J].

Li, BA ;

Ko, CM ;

Ren, ZZ .

PHYSICAL REVIEW LETTERS, 1997, 78 (09) :1644-1647

[6] Isospin physics in heavy-ion collisions at intermediate energies [J].

Li, BA ;

Ko, CM ;

Bauer, W .

INTERNATIONAL JOURNAL OF MODERN PHYSICS E, 1998, 7 (02) :147-229

[7] Nucleon-nucleon cross sections in neutron-rich matter and isospin transport in heavy-ion reactions at intermediate energies [J].

Li, BA ;

Chen, LW .

PHYSICAL REVIEW C, 2005, 72 (06)

[8] Double neutron/proton ratio of nucleon emissions in isotopic reaction systems as a robust probe of nuclear symmetry energy [J].

Li, BA ;

Chen, LW ;

Yong, GC ;

Zuo, W .

PHYSICS LETTERS B, 2006, 634 (04) :378-382

[9] Probing the high density behavior of the nuclear symmetry energy with high energy heavy-ion collisions [J].

Li, BA .

PHYSICAL REVIEW LETTERS, 2002, 88 (19) :4-192701

[10]

LI BQ, COMMUNICATION

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