Study of High-Temperature, High-Density Hadronic Matter

高温高密度强子物质研究

• 批准号: 03044102
• 负责人: SUMI Yoshio
• 金额: $ 7.04万
• 依托单位: Hiroshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03044102/
• 关键词: High-energy heavy-ion collisions; Ouark-gluon plasma; Two-particle interferometry; Focussing spectrometer; CERN-SPS accelerator; 高エネルギ-重イオン衝突; ハンブリ-・ブラウン・ツィス効果; クォ-ク・グル-オン・プラズマ; 運動量収束型スペクトロメ-タ

1. Using the momentum focussing spectrometer which we have constructed at the CERN-SPS, we have accumulated a large amount of raw deta on 450-GeV proton-nucleus and 200-GeV/nucleon sulphur-nucleus collisions.2. We have developed a new type of gas Cherenkov detector as a beam counter for the sulphur-beam experiment. The counter worked successfully, achieving a time resolution of 36 ps even at practical beam intensity 2x10^6 ions/s.3. The NA44 Collaboration which includes our group and the results obtained by these institutions were checked carefully.4. The results of pion interferometry in sulphur-lead collisions are to be published in near future as a paper in Nucl. Phys. B.5. Our preliminary results on kaon interferometry show that the source size of Kaons is smaller than that of pions by about a factor 1/2 for sulphur-lead collisions.6. No significant difference is found between the source sizes of K^+ and K^-.7. Any of singles spectra for pions, kaons, protons and anti-protons can be fitted by a single exponential function of the transverse mass of these hadrons and the temperature parameter of hadron source is deduced for these hadrons separately.8. A simulation code for lead-nucleus collisions has been developed.9. As one of central detectors of future lead-nucleus collisions, we are developing a gas Cherenkov counter for particle idenrification.

1. 利用我们在CERN-SPS上建造的动量聚焦光谱仪，我们积累了大量的450 gev质子-核和200 gev /核子硫核碰撞的原始数据。研制了一种新型的气体切伦科夫探测器，作为硫束流实验的束流计数器。该计数器工作成功，即使在实际光束强度为2x10^6离子/秒的情况下，也能达到36ps的时间分辨率。我们仔细检查了包括我们小组在内的NA44协作以及这些机构获得的结果。硫铅碰撞中的介子干涉测量结果将在不久的将来作为论文发表在《原子核》杂志上。理论物理。B.5。我们对介子干涉测量的初步结果表明，在硫铅碰撞中，介子的源尺寸比介子的源尺寸小约1/2。K^+和K^- 0.7的源大小没有显著差异。π子、介子、质子和反质子的单谱可以用强子横质量的单指数函数拟合，并分别推导出了这些强子源的温度参数。开发了铅核碰撞的模拟程序。作为未来铅核碰撞的中心探测器之一，我们正在开发用于粒子识别的气体切伦科夫计数器。

项目成果

T.Kobayashi & T.Sugitate: "Test of prototype for highly segmented TOF hodoscope" Nuclear Instruments and Methods. A287. 389-396 (1990)

小林T

T. Sugitate et al. (NA44 collaboration): "Particle Interferometry in the NAJJ Experiment at CERN" Proceedings of Intnational Symposium on High Energy Nuclear Collisions and Quark Gluon Plasma edited by M. Biyajima et al. World Scientific. 264-269 (1991)

T.Sugitate 等人。

M. Sarabura et al. (NA44 collaboration): "Results from CERN Experiment NA44" Nuclear Physics A. 544. 125c-136c (1992)

M.Sarabura 等人。

H. Maeda, S. Esumi, A. Sakaguchi, T. Sugitate and Y. Sumi: "A Cherenkov beam counter for ultra-relativistic heavy-ion experiment" Submitted to Nuclear Instruments and Methods A.

H. Maeda、S. Esumi、A. Sakaguchi、T. Sugitate 和 Y. Sumi：“用于超相对论重离子实验的切伦科夫光束计数器”提交给 Nuclear Instruments andMethods A。

T.Sugitate et al.: "Observation of ring imaging Cherenkov photons with an image-intensifier" Nuclear Instruments and Methods. A307. 265-272 (1991)

T.Sugitate 等人：“用图像增强器观察环成像切伦科夫光子”核仪器和方法。