Space-Time Evolution of Hot Hadronic Matter Studied in PHENIX

PHENIX 研究的热强子物质的时空演化

• 批准号: 12440066
• 负责人: SUGITATE Toru
• 金额: $ 8.7万
• 依托单位: HIROSHIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12440066/
• 关键词: high-energy heavy-ion collision; hadronic matter; space-time evolution; PHENIX experiment; Quantum interferometry; Lead Tungustate crystal; photon detector; PWO crystal; 鉛タングステン結晶

In order to investigate non-perturbative QCD phenomenon of multiple quarks at high temperature, we have carried out this study in cooperation with the PHENIX collaboration at BNL-RHIC. Very high-statistic data of more than 100 million events in gold on gold-nuclear collisions were successfully taken in 2000 to 2002. Spatial and temporal evolution of the hot and dense nuclear matter created during the collisions was studied through three-dimensional two-particle correlation functions of charged pion-pairs and kaon-pairs. We found very clear dependences of the source size parameters both on the impact parameter of primary nuclear collisions and on the momentum of observed pairs. It is concluded that a hydro-dynamical expansion is created inside the colliding section and the strong radial flow affects the momentum correlation of secondary particles at freeze-out, as we have seen in studies at the CERN-SPS energies. Long duration time of particle emission was not observed in the measurements of pions, and this fact turns out to exclude several models predicting longer duration time as the pair momentum increases. A new theoretical scenario is demanded to understand what's going on.An electro-magnetic calorimeter prototype composed of a 3 by 3 tower of lead-tungstate crystal (PWO) produced by Furukawa, was studied with photon beams at LNS, Tohoku University. It achieved the energy resolution of 32MeV for GeV photons. To develop a new photon detection system being replaced with aphotomultiplier tube, a readout system of an avalanche-photo-diode with a newly designed pre-amplifier was studied. We are now ready to build a proof model.As an extension of this study, we have submitted a new plan supposed by a Grants-in-Aid entitled "QCD matter at High-Temperature" starting in H15.

为了在高温下研究多个夸克的非扰动QCD现象，我们与BNL-RHIC的Phenix合作进行了这项研究。在2000年至2002年成功采取了超过1亿个黄金事件的高统计数据。在2000年至2002年。在碰撞期间产生的热和密集的核物质的空间和时间演变是通过带电的pion对和kaon-pairs的三维两维的两粒子相关函数研究的。我们发现，源大小参数非常明确，既对原发性核碰撞的影响参数以及观察到的对的动量。结论是，正如我们在CERN-SPS能量的研究中所看到的那样，在碰撞部分内会产生水力动力膨胀，强烈的径向流动会影响二级颗粒的动量相关性。在乳腺的测量值中未观察到颗粒发射的持续时间，事实证明，随着对持续动量的增加，这一事实排除了几个预测持续时间的模型。要求一种新的理论场景了解正在发生的事情。一个由Furukawa生产的电磁热量表原型由Furukawa生产的3乘3塔组成，并在LNS的LNS，Toohoku University研究了。它实现了GEV光子的32MEV能量分辨率。为了开发一个被垂直型管替换的新的光子检测系统，研究了一个带有新设计的预宽放大器的雪崩 - 光 - 二极管的读数系统。现在，我们准备建立一个证明模型。作为这项研究的扩展，我们提交了一项新计划，该计划由H15开始，题为“高温为QCD Matter”。

项目成果

I.G.Bearden: "Two-kaon correlations in central Pb + Pb collisions at 158 A GeV/c"Physical Review Letters. 87. 112301-1-112301-6 (2001)

I.G.Bearden：“158 A GeV/c 中心 Pb Pb 碰撞中的双 kaon 相关性”物理评论快报。

K.Adcox: "Flow Measurements via Two-Particle Azimuthal Correlations in Au + Au Collisions at √<SNN>=130 GeV"Physical Review Letters. 66. 212301-1-212301-6 (2002)

K.Adcox：“在 √<SNN>=130 GeV 处通过 Au + Au 碰撞中的两粒子方位相关进行流量测量”物理评论快报 66。212301-1-212301-6 (2002)

K.Adcox: "Centrality Dependence of Charged Particle Multiplicity in Au-Au Collisions at 【square root】s_<NN>=130 GeV"Physical Review Letters. 86. 3500-3505 (2001)

K.Adcox：“【平方根】s_<NN>=130 GeV 时 Au-Au 碰撞中带电粒子多重性的中心依赖性”物理评论快报 86. 3500-3505 (2001)。

TORU SUGITATE: "XXXI International Symposium on Multiparticle Dynamics"CORRELATIONS AND FLUCTUATIONS AT RHIC. 331-334 (2002)

TORU SUGITATE：“第三十一届多粒子动力学国际研讨会”RHIC 的相关性和波动。

K.Adcox: "Measurement of lambda and lamda-bar particles in Au+Au Collisions at √<SNN>=130 GeV"Physical Review Letters. 89. 092302-1-092302-6 (2002)

K.Adcox：“在 √<SNN>=130 GeV 下 Au+Au 碰撞中 lambda 和 lamda-bar 粒子的测量”物理评论快报 89。092302-1-092302-6 (2002)