共查询到19条相似文献,搜索用时 78 毫秒
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应用重叠柱模型描述了高能核-核碰撞中带电粒子的快度(或赝快度)分布. 对目前加速器上的固定靶实验而言, 观察到了相同相对强度的纵向流, 两个完全重叠的热化柱能够描述实验数据. 在更高能量范围(4A TeV以上), 观察到了更强的纵向流, 这时需要两个部分重叠的热化柱来描述实验数据. 用重叠柱模型计算得到的(赝)快度分布与1A GeV到100A TeV能区的实验结果符合. 相似文献
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在高能轻子-核碰撞中,基于二源发射图象描述了簇射粒子多重数和赝快度分布,计算结果与3-210GeV的中微子-核乳胶碰撞的实验数据符合. 相似文献
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在高能轻子-核碰撞中,基于二源发射图象描述了簇射粒子多重数和赝快度分布,计算结果与3-210GeV的中微子-核乳胶碰撞的实验数据符合. 相似文献
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论述了高能中微子与核乳胶碰撞中,归一化的两粒子相对赝快度分布,和平均最大簇射粒子数密度与多重数的关联. In high energy neutrino emulsion collisions, the normalized distribution of two particle relative pseudorapidity and the correlation between the mean maximum number density of shower particles and multiplicity are investigated. 相似文献
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基于三火球模型和强子共振态衰变图象,得到了相对论性重离子碰撞中负粒子的横动量和赝快度分布,并与200和60GeV/N 16O与An相互作用的有关实验结果作了比较. 相似文献
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重离子碰撞产生的高温高密度物质假设按照统一流体力学模型的规律做时空演化,并最终经由一固有时为Tau_FO的类时超曲面冻析为带电粒子。统一流体力学模型是一种将Landau与Hwa-Bjorken两著名流体力学模型结合在一起的模型,是一种少有的可精确求解的理论之一。本文的研究表明:BNL-RHIC低能量区重离子碰撞中带电粒子的赝快度分布可由统一流体力学模型很好地描述。 这与高能区的情况不同,在那里,除了流体外,还需考虑带头粒子的贡献。The hot and dense matter created in heavy ion collisions is supposed to have spatiotemporal evolution according to unified hydro model, and finally freeze out into the charged particles via a space-like hypersurface with a proper time Tau_FO . The unified hydro model is a model which integrates Landau and Hwa-Bjorken two famous hydro models together. It is one of few hydro models which can solved exactly. Shown from the investigations in this paper, the pseudorapidity distribution of charged particles in heavy ion collisions at low BNL-RHIC energy region can be well described by unified hydro model. This is different from that at high nergy region, where, apart from fluid, the contribution from leading particles should be taken into account. 相似文献
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The pseudorapidity distribution of shower particles produced in the 24Mg-emulsion collisions at 4.5A GeV/c is reported in this paper. The dependences of the distribution width and the peak position on the target size are observed.The pseudorapidity distribution of shower particles for the events with low target multiplicity (light target) is narrower than that with high target multiplicity (heavy target). The maximum probability pseudorapidity for light target is greater than that for heavy target. The experimental data is analyzed by using the cylinder model suggested by Liu et al. The Monte Carlo results based on Liu's cylinder model are approximately in agreement with the experimental tendency and fluctuation. 相似文献
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Using the Glauber model,we discuss the number of binary nucleon-nucleon collisions in heavy-ion collisions.Based on the latter,after considering the effect of energy loss of the nucleons in multiple colli- sions,we derive the pseudorapidity distribution of the multiplicity as a function of the impact parameter in nucleus-nucleus collisions.Using this,we analyze the experimental measurements carried out by the BRAHMS Collaboration in Au Au collisions at Pseudorapidity distribution of multiplicity in Au Au collisions at (S_(NN))~(1/2)=200 GeV)=200 GeV.The results are in good agreement with the experi- mental observations. 相似文献
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WANG Shao-Shun ZHANG Jie XIAO Chen-Guo YE Yun-Xiu CHENG Zheng-Dong ZHANG Xue-Qian LUO Qi XU Wan-Li XIONG Wei-Jun 《中国物理C(英文版)》1992,16(6):487-493
The pseudorapidity distributions of charged produced in pp collisions at 400GeV/c have been measured using LEBC films.Two-particle pseudorapidity correlations at fixed multiplicity have been studied.The experimental data was fitted by cluster model.It is found that the average cluster multiplicities as well as the cluster decay widths both vary slightly with charged multiplicity. 相似文献
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Wang Shaoshun Zhang Jie Xiao Chenguo Ye Yunxiu Zhong Yu Shen Tianguang 《中国物理C(英文版)》1995,19(11):968-973
The fractal behaviour of multiplicity production in 400 GeV/c pp collisions is analyzed using the modified multifractal moments.The generalized dimensions Dq,q=2—5,are calculated.A comparison with the results obtained by the method of scaled factorial moments has been made. The results show that the multifractal character is observed.The fractal analysis method proposed by Fujio Takagi has been tested. 相似文献
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用三火球模型分析了核--核以AGS(the Alternating Gradient Synchrotron)和SPS(the Super Proton Synchrotron)能量碰撞中产生质子的快度分布. Monte Carlo方法计算的结果分别与金--金以6, 8和10.8A GeV的能量并以不同中心性碰撞、铅-铅以158A GeV/c的动量碰撞、以及硫-硫以200A GeV/c的动量碰撞的实验数据符合. 相似文献
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Using the Glauber model,we discuss the number of binary nucleon-nucleon collisions in heavy-ion collisions.Based on the latter,after considering the effect of energy loss of the nucleons in multiple collisions,we derive the pseudorapidity distribution of the multiplicity as a function of the impact parameter in nucleus-nucleus collisions.Using this,we analyze the experimental measurements carried out by the BRAHMS Collaboration in Au+Au collisions at √SNN=200 GeV.The results are in good agreement with the experimental observations. 相似文献