共查询到18条相似文献,搜索用时 140 毫秒
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讨论高能多粒子产生反常标度性研究中的各种相空间变量选择.为了克服几种常用的横向相空间变量的缺点,引入了一组新的横向变量.这组变量在讨论高能多粒子产生中的反常标度性时有优越性.给出了这组新变量的统计分布及数值特征,讨论了它们之间的独立性,给出了相应的累积变量. 相似文献
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运用Jetset产生器分别在实验室系和冲度轴坐标系中对e+e—对撞多粒子末态中阶乘矩的标度性质进行了研究.在这两种情况下,用各向同性的相空间分割得到的三维InF2~InM都近似于直线,表明e+e-对撞末态相空间中的动力学起伏近似各向同性.在实验室系中由px,py,pz的F2~M拟合Ochs公式得到的三个γ值近似相等;在冲度轴系中,在φ方向上适当选取起始拟合点,三个γ值也比较相近,进一步肯定了这一论断.这一结果表明,软、硬过程动力学起伏的本质特征──各向异性或(近似)各向同性,可以通过碰撞过程中阶乘矩标度性质的研究而揭示出来.因此,深入研究各种碰撞过程中阶乘矩的标度性质,对于了解碰撞动力学的本质有重要意义. 相似文献
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The intermittency effect has been studied for an interaction of 3.7 A GeV ^16O with emulsion using the distributions of both the pseudorapidity intervals and the azimuthal angle intervals of the shower particles emitted in a central rapidity region. The scaled factorial moments, reduced scaled factorial moments and multifractal moments as functions of the bin size in pseudorapidity and in azimuthal angle have been calculated and have revealed the presence of an intermittent behaviour which may be due to the random cascading property of the reaction. The anomalous fractal dimension has been found to increase with the increase of rank of the moment. 相似文献
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对3.7A GeV 16O-Em作用产生的慢粒子标度阶乘矩分布进行研究, 得出间歇指数随矩阶数的增加而增加, 随靶核质量的增加而减小; 反常分形维数
随q的增加而增加; 对于每一个q值, dq随平均多重数的增加而减小,
表明在3.7A GeV 16O-Em作用中多粒子产生具有自相似级联的性质. 相似文献
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Self-afline multiplicity scaling is investigated in the framework of a two-dimensional factorial mo-ment methodology using the concept of the Hurst exponent (H). Analyzing the experimental data of target evaporated fragments emitted in84Kr-AgBr interactions at 1.7 AGeV revealed that the best power law behav-ior is exhibited for H = 0.3 indicating a self-affine multiplicity fluctuation pattern. A signal of multifractality is also observed from knowledge of the anomalous fractal dimension dq extracted from the intermittency exponent aq of the anisotropic phase space scenario. 相似文献
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Lianshou Liu Yang Zhang Yuanfang Wu 《Zeitschrift fur Physik C Particles and Fields》1995,69(1):323-326
The anomalous scaling of factorial moments with continuously diminishing scale is studied using a random cascading model. It is shown that the model currently used have the property of anomalous scaling only for descrete values of elementary cell size. A revised model is proposed which can give good scaling property also for continuously varying scale. It turns out that the strip integral has good scaling property provided the integral regions are chosen correctly, and that this property is insensitive to the concrete way of self-similar subdivision of phase space in the models. 相似文献
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Evidence of intermittent fluctuation of target fragments in ^84Kr-AgBr interactions at 1.7 A GeV 下载免费PDF全文
Intermittency and fractal behaviour have been studied of emission spectra of target associated fragments from ^84Kr-AgBr interactions at 1.7 A GeV in emission angle space and azimuthal angle space separately. The intermittent behaviour is observed in the two spaces separately. Prom the intermittency exponent, the anomalous fractal dimension dq is calculated and the variation of dq with the order q is investigated. It is found that the anomalous dimensions are found to increase with the order of moments q, thereby indicating the relation of multifractality to production mechanism of target associated fragments. 相似文献
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A study of intermittency of target associated fragments produced in the interactions of 16OAgBr at 4.5 AGeV/c with nuclear emulsion using the method of factorial moments,Fq,has been performed. The dependence of the moments on the number of bins M is found to follow a power law behavior for the experimental data in terms of new scaled variable X(z) suggested by Bialas and Gazdzicki.The anomalous dimensions,dq,increase linearly with the order of moments,q.This observation indicates the association of multifractility with production mechanism of target associated fragments. 相似文献
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L. F. Babichev A. A. Bukach V. I. Kuvshinov V. A. Shaparau 《Physics of Atomic Nuclei》2004,67(3):574-581
The formalism of squeezed states within Ginzburg-Landau theory is used to describe parton-hadron phase transitions in processes involving the production of rather high energy densities. Normalized factorial moments are studied as functions of a bin width of phase space at various squeezing parameters. The intermittency effect and scaling behavior of the moments under consideration are revealed. The values obtained for the scaling exponent agree with experimental data at small values of the squeezing parameter. 相似文献