共查询到18条相似文献,搜索用时 421 毫秒
1.
相对论重离子碰撞中背景的选取对2π干涉学分析的影响 总被引:4,自引:1,他引:3
用小相对动量区域2π干涉学分析方法,研究了相对论重离子碰撞中背景的选取对2π干涉学分析所得π源参数的影响,得到了在不同背景下2π干涉学分析所得π源参数之间的解析关系,与相对论重离子中心碰撞1.8A GeV Ar+Pb的实验结果进行了对比. 相似文献
2.
3.
相对论重离子碰撞中小相对动量区域3π干涉学分析 总被引:4,自引:2,他引:2
用3π关联函数在小相对动量区域的幂级数展开,得到了3π关联函数与π源均方根半径的关系.对π源密度的高斯分布,在不考虑和考虑3π事件中的多π关联效应两种情况下,解析地得到了由2π干涉学分析得到的π源空间参数和由3π干涉学分析得到的π源空间参数的理论关系.计算了3π事件中的多π关联引起的2π关联因子的偏离.与小相对动量区域2π干涉学得到的结果和相对论重离子中心碰撞1.8A GeV Ar+Pb的实验结果进行了对比. 相似文献
4.
5.
6.
给出了相对重离子碰撞中的在关联nπ和非关联nπ的选取中存在多π关联效应时nπ关联函数的一般表达式。用这一表达式研究了计及多π关联效应的小相对动量区域2π干涉学,得到了从3π干涉学分析得到的π源参数与计及多π关联效应后,从2π干涉学分析得到的π源参数的角析关系,与相以论重离子中心磁撞1.8A GeV Ar Pb的实验结果进行了对比。 相似文献
7.
8.
提出了一种相对论重离子碰撞中强子物质生成时的π膨胀源模型. 得到了该模型中的小相对论动量区域的2π关联函数及表观π源参数Ra与实际π源参数Re的关系. 这一关系与QGP生成时的关系有所区别. 这一区别可以用来检测相对论重离子碰撞中产生的非静态球形夸克-胶子等离子体的存在性. 两个关系也显示了一种标度行为. 相似文献
9.
相对论重离子碰撞中π源密度分布和小相对动量区域2π干涉学分析 总被引:6,自引:3,他引:3
用2π关联函数在小相对动量区域的幂级数展开,得到了不同π源密度分布下源的空间参数、平均半径和均方根半径间关系,与相对论重离子中心碰撞1.8A GeV Ar+Pb的实验结果一致. 给出了上述反应中π源的平均半径和均方根半径.对不同的源密度分布,计算了Kt的值. 相似文献
10.
11.
12.
Two-pion interferometry at small relative momentum for pion sources with transverse and longitudinal expansions in relativistic heavy ion collisions
下载免费PDF全文
![点击此处可从《中国物理》网站下载免费的PDF全文](/ch/ext_images/free.gif)
A two-pion correlation function at small relative momentum for pion sources with transverse and longitudinal expansions in relativistic heavy ion collisions is obtained using two-pion interferometry at small relative momentum, and the relations between the real and apparent parameters of the pion source are given. The relations can be used to extract both the temperature and the transverse and longitudinal expansion velocities of pion sources and to verify the correctness of relativistic transformation T′=T\sqrt {1-v^2} of temperature in relativistic statistical mechanics and thermodynamics. 相似文献
13.
Roynette J. C. Frascaria N. Blumenfeld Y. Jacmart J. C. Plagnol E. Garron J. P. Gamp A. Fuchs H. 《Zeitschrift für Physik A Hadrons and Nuclei》1981,302(1):73-77
Proton and pion spectra from relativistic heavy ion collisions are calculated in the framework of a hydrochemical model. An explanation of the striking absence of the delta decay pion peak in the observed pion spectra is suggested. 相似文献
14.
The two-pion correlation functions are different for some pion source distributions in two-pion interferometry.If quark-gluon plasma of cylindrical shape is produced in relativistic heavy ion collisions, the pion mesons will emit from the surface of quark-gluon plasma of cylindrical shape and the corresponding correlation function will have a special oscillation behavior. The oscillation behavior can be used to verify the existence of quark-gluon plasma and is also a signature of the appearance of quark-gluon plasma. 相似文献
15.
16.
《Nuclear Physics A》1986,458(4):725-744
Electromagnetic effects in relativistic heavy ion collisions with impact parameter larger than the sum of the nuclear radii are studied using the virtual photon method. With increasing value of the relativistic parameter γ the hardness of the virtual photon spectrum increases. This leads to interesting new effects which will also have to be considered in the design of future relativistic heavy ion machines and experiments. The excitation of high-lying giant E1 and E2 multipole resonances is calculated as well as electromagnetic pion production. Coulomb bremsstrahlung is calculated and compared to the bremsstrahlung emitted in the more violent central nuclear collisions. K-shell ionization and electron-positron pair production is studied. The latter process has a very large cross section for heavy ions and contributes significantly to the stopping power of relativistic heavy ions in a dense medium. 相似文献
17.
B. M. Waldhauser J. A. Maruhn H. Stöcker W. Greiner 《Zeitschrift für Physik A Hadrons and Nuclei》1987,328(1):19-22
A relativistic baryon-meson mean field theory (including delta resonances) is used to study the dependence of pion production in heavy ion collisions on the nuclear equation of state and on the delta-meson coupling constants. For fixed ground state equations of state, the pion yields depend sensitively on the value of the delta-meson coupling constants. 相似文献
18.
The multi-source pion interferometry in relativistic heavy-ion collisions is presented and two-source models for hadron gas and hadron gas plus quark-gluon plasma are proposed. The models can resolve the HBT puzzle. For the same $q$ and different direction of \bar{q}, the two-pion correlation functions show characteristic oscillation behaviors, which may be used to distinguish the two-source models. Our research also showes that the multi-source pion correlations can resolve the HBT puzzle. 相似文献