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

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

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