高能核-核碰撞中靶蒸发碎片的前向-后向发射
Forward-backward emission of target evaporated evaporated fragments at high energy nucleus-nucleus collisions
摘要：
研究了12 A GeV的$^{4}$ He、3.7 A GeV的$^{16}$ O、60 A GeV的$^{16}$ O、1.7 A GeV的$^{84}$ Kr和10.7 A GeV的$^{197}$ Au乳胶重靶（AgBr）相互作用中靶蒸发碎片在前半球和后半球发射的多重数分布、多重数矩、标度方差、熵和约化熵.结果表明，靶蒸发碎片在前半球和后半球的多重数分布可用高斯分布拟合。在前半球和后半球发射的目标蒸发粒子的多重数矩随着矩{ \em q}的阶数的增加而增加，并且对于前半球和后半球的所有相互作用，二阶多重数矩分别与总能量无关。标度方差，多重性波动的直接测量，是接近一个所有的相互作用，可以说，有一个微弱的相关性之间产生的粒子。在实验误差范围内，前半球和后半球发射的靶蒸发碎片的熵是相同的。
英文摘要：
The multiplicity distribution, multiplicity moment, scaled variance, entropy and reduced entropy of target evaporated fragment emitted in forward and backward hemispheres in 12 A GeV $^{4}$He, 3.7 A GeV $^{16}$O, 60 A GeV $^{16}$O, 1.7 A GeV $^{84}$Kr and 10.7 A GeV $^{197}$Au induced emulsion heavy targets (AgBr) interactions are investigated. It is found that the multiplicity distribution of target evaporated fragments emitted in forward and backward hemispheres can be fitted by a Gaussian distribution. The multiplicity moments of target evaporated particles emitted in forward and backward hemispheres increase with the order of the moment {\em q}, and second-order multiplicity moment is energy independent over the entire energy for all the interactions in the forward and backward hemisphere respectively. The scaled variance, a direct measure of multiplicity fluctuations, is close to one for all the interactions which may be said that there is a feeble correlation among the produced particles. The entropy of target evaporated fragments emitted in forward and backward hemispheres are the same within experimental errors, respectively.
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