Study of entropy in intermediate-energy heavy ion collisions

Xiao-Ji Zhang; Wen-Jun Guo; Xian-Jie Li; Kuo Wang

doi:10.1088/1674-1137/40/3/034103

Chinese Physics C> 2016, Vol. 40> Issue(3) : 034103 DOI: 10.1088/1674-1137/40/3/034103

Study of entropy in intermediate-energy heavy ion collisions

1.
University of Shanghai for Science and Technology, Shanghai 200093, China

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Abstract：
Using the isospin-dependent quantum molecular dynamics model, the entropy of an intermediate-energy heavy ion collision system after the reaction and the number of deuteronlike and protonlike particles produced in the collision is calculated. In the collision, different parameters are used and the mass number used here is from 40 to 93 at incident energy from 150 MeV to 1050 MeV. We build a new model in which the density distribution of the reaction product is used to calculate the size of the entropy. The entropy calculated with this model is in good agreement with experimental values. Our data reveals that with the increase of the neutron-proton ratio and impact parameter, the entropy of the reaction system decreases, and it increases with the increase of system mass and reaction energy.
- entropy ,
- neutron-proton ratio ,
- isospin effect ,
- intermediate-energy heavy ion reaction

References

[1]	D. V. Shetty, S. J. Yennello, and G. A. Souliotis, Phys. Rev. C, 75: 034602 (2007)
[2]	I. Vidaa and I. Bombaci, Phys. Rev. C, 66: 045801 (2002)
[3]	B. A. Li, C. M. Ko, and Z. Z. Ren, Phys. Rev. Lett., 78: 1644 (1997)
[4]	J. Y. Liu, W. J. Guo et al, Phys. Rev. C, 70: 034610 (2004)
[5]	J. Y. Liu, W. J. Guo et al, Phys. Rev. Lett., 86: 975 (2001)
[6]	S. X. Li, D. Q. Fang, Y. G. Ma et al, Phys. Rev. C, 84: 024607 (2011)
[7]	C. Zhong, X. Z. Cai, W. Q. Shen et al, Chin. Phys. Lett., 20: 629 (2003)
[8]	Y. X. Zhang, Z. X. Li, and C. S. Zhou, Phys. Rev. C, 85(5): 051602
[9]	Y. X. Zhang, M. B. Tsang, and Z. X. Li et al, Phys. Lett. B, 732: 186-190
[10]	Z. Q. Feng and H. Lenske, Phys. Rev. C, 89(4): 04461
[11]	Z. Q. Feng, W. J. Xie, and G. M. Jin, Phys. Rev. C, 90(6): 064604
[12]	C. C. Guo, Y. J. Wang, Q. F. Li et al, Phys. Rev. C, 90(3): 034606
[13]	W. J. Xie and F. S. Zhang, Phys. Lett. B, 735: 250-255
[14]	J. Wang, Y. G. Ma, G. Q. Zhang et al, Phys. Rev. C, 90(5): 054601
[15]	L. M. Yang, W. J. Guo, F. Zhang et al, Chin. Phys. C, 37(10): 104101
[16]	A. Zhang, W. J. Guo, J. W. Huang et al, Chin. Phys. C, 38(5): 054103
[17]	L. M. Yang, W. J. Guo, Y. P. Zhang et al, Chin. Phys. C, 38(7): 074105
[18]	W. J. Guo, J. W. Huang, G. C. Yong et al, Chin. Phys. Lett., 31(10): 102501
[19]	K. G. R. Doss, et al, Phys. Rev. C, 32: 116 (1985)
[20]	K. G. R. Doss et al, Phys. Rev. C, 37: 163 (1988)
[21]	Y. G. Ma, Phys. Rev. Lett., 83: 3617-3620 (1999)
[22]	P. J. Siemens and J. I. Kapusta, Phys. Rev. Lett., 43: 1486 (1979)
[23]	Y. K. Vermani and R. K. Puri, Nucl. Phys. A, 847: 243-252 (2010)
[24]	S. Kaur and R. K. Puri, Phys. Rev. C, 89: 057603 (2014)
[25]	G. Bertsch and J. Cognon, Phys. Rev. C, 24(6): 2514 (1981)
[26]	G. Bertsch, Nucl. Phys. A, 400: 221 (1983)
[27]	G. Peilert et al. Phys. Rev. C, 39:1402 (1989)
[28]	B. A. Li, C. M. Ko, and W. Bauer, Int. J. Mod. Phys. E, 7: 147-230 (1998)
[29]	K. Chen, Z. Fraenkel, Friedlander D et al, Phys. Rev., 166: 949 (1968)
[30]	D. Klakow, G. Welke, and W. Bauer, Phys. Rev. C, 48: 1982 (1993)

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Xiao-Ji Zhang, Wen-Jun Guo, Xian-Jie Li and Kuo Wang. Study of entropy in intermediate-energy heavy ion collisions[J]. Chinese Physics C, 2016, 40(3): 034103. doi: 10.1088/1674-1137/40/3/034103

Xiao-Ji Zhang, Wen-Jun Guo, Xian-Jie Li and Kuo Wang. Study of entropy in intermediate-energy heavy ion collisions[J]. Chinese Physics C, 2016, 40(3): 034103. doi: 10.1088/1674-1137/40/3/034103 shu

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Received: 2015-03-27
Revised: 2015-10-22

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Study of entropy in intermediate-energy heavy ion collisions

Corresponding author: Wen-Jun Guo,

1. University of Shanghai for Science and Technology, Shanghai 200093, China

Received Date: 2015-03-27

Accepted Date: 2015-10-22

Available Online: 2016-02-29

Abstract: Using the isospin-dependent quantum molecular dynamics model, the entropy of an intermediate-energy heavy ion collision system after the reaction and the number of deuteronlike and protonlike particles produced in the collision is calculated. In the collision, different parameters are used and the mass number used here is from 40 to 93 at incident energy from 150 MeV to 1050 MeV. We build a new model in which the density distribution of the reaction product is used to calculate the size of the entropy. The entropy calculated with this model is in good agreement with experimental values. Our data reveals that with the increase of the neutron-proton ratio and impact parameter, the entropy of the reaction system decreases, and it increases with the increase of system mass and reaction energy.

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Study of entropy in intermediate-energy heavy ion collisions

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