Forward-backward emission of target evaporated fragmentsin high energy nucleus-nucleus collisions

ZHANG Zhi; MA Tian-Li; ZHANG Dong-Hai

doi:10.1088/1674-1137/39/10/104002

Chinese Physics C> 2015, Vol. 39> Issue(10) : 104002 DOI: 10.1088/1674-1137/39/10/104002

Forward-backward emission of target evaporated fragmentsin high energy nucleus-nucleus collisions

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Abstract：
The multiplicity distribution, multiplicity moment, scaled variance, entropy and reduced entropy of target evaporated fragments emitted in forward and backward hemispheres in 12 A GeV ⁴He, 3.7 A GeV ¹⁶O, 60 A GeV ¹⁶O, 1.7 A GeV ⁸⁴Kr and 10.7 A GeV ¹⁹⁷Au-induced emulsion heavy target (AgBr) interactions are investigated. It is found that the multiplicity distribution of target evaporated fragments emitted in both forward and backward hemispheres can be fitted by a Gaussian distribution. The multiplicity moments of target evaporated particles emitted in the forward and backward hemispheres increase with the order of the moment q, and the second-order multiplicity moment is energy independent over the entire energy range for all the interactions in the forward and backward hemisphere. The scaled variance, a direct measure of multiplicity fluctuations, is close to one for all the interactions, which indicate a correlation among the produced particles. The entropy of target evaporated fragments emitted in both forward and backward hemispheres are the same within experimental errors.

References

[1]

Bowman J D, Swiatecki W J, Tsang C F. Abrasion and Ablation of Heavy Ions. Lawrence Berkeley Report: LBL-2908, 1973[2] Powell C F, Fowler P H, Perkins D H. The Study of Elementary Particles by the Photographic Method, Pergamon Press. London, New York: Paris, Los Angles, 1959. 432[3] Ghosh D, Deb A, Bhattacharyya S. Phys. Scr., 2011, 84: 015201[4] ZHANG Dong-Hai, CHEN Yan-Ling, WANG Guo-Rong et al. Chin. Phys. C, 2015, 39: 014001[5] Stocker H, Maruhn J A, Greiner W. Z. Phys. A, 1979, 293: 173-179[6] Koba Z, Nielsen H B, Olesen P. Nucl. Phys. B, 1972, 40: 317-334[7] Wehrl A. Rev. Mod. Phys., 1978, 50: 221-260[8] Simak V, Sumbera M, Zborovski I. Phys. Lett. B, 1988, 206: 159-162[9] Ghosh D. Roy J. Sengupta A G et al. Can. J. Phys., 1992, 70: 667-669

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ZHANG Zhi, MA Tian-Li and ZHANG Dong-Hai. Forward-backward emission of target evaporated fragmentsin high energy nucleus-nucleus collisions[J]. Chinese Physics C, 2015, 39(10): 104002. doi: 10.1088/1674-1137/39/10/104002

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Received: 2015-01-05
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Forward-backward emission of target evaporated fragmentsin high energy nucleus-nucleus collisions

Corresponding author: ZHANG Dong-Hai,

Received Date: 2015-01-05
Accepted Date: 1900-01-01
Available Online: 2015-10-10

Abstract: The multiplicity distribution, multiplicity moment, scaled variance, entropy and reduced entropy of target evaporated fragments emitted in forward and backward hemispheres in 12 A GeV ⁴He, 3.7 A GeV ¹⁶O, 60 A GeV ¹⁶O, 1.7 A GeV ⁸⁴Kr and 10.7 A GeV ¹⁹⁷Au-induced emulsion heavy target (AgBr) interactions are investigated. It is found that the multiplicity distribution of target evaporated fragments emitted in both forward and backward hemispheres can be fitted by a Gaussian distribution. The multiplicity moments of target evaporated particles emitted in the forward and backward hemispheres increase with the order of the moment q, and the second-order multiplicity moment is energy independent over the entire energy range for all the interactions in the forward and backward hemisphere. The scaled variance, a direct measure of multiplicity fluctuations, is close to one for all the interactions, which indicate a correlation among the produced particles. The entropy of target evaporated fragments emitted in both forward and backward hemispheres are the same within experimental errors.