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.

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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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通讯作者:陈斌, bchen63@163.com

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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 GeV⁴He, 3.7 A GeV¹⁶O, 60 A GeV¹⁶O, 1.7 A GeV⁸⁴Kr and 10.7 A GeV¹⁹⁷Au-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 momentq, 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.

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

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