Study of High-Temperature, High-Density Hadronic Matter

1.利用我们在CERN-SPS建造的动量聚焦谱仪，我们积累了大量450 GeV质子-核和200-GeV/核子硫-核碰撞的原始数据。我们研制了一种新型气体切伦科夫探测器，作为硫束实验的束流计数器。计数器工作成功，即使在实际束流强度为2×10~(-6)离子/秒的情况下，时间分辨率也达到了36ps。仔细检查了包括我们小组在内的NA44合作以及这些机构所获得的结果。硫铅碰撞中的介子干涉测量结果将在不久的将来作为一篇论文发表在Nucl上。太棒了。B.5.我们对K介子干涉测量的初步结果表明，对于硫-铅碰撞，K介子的源尺寸比介子源小约1/2。K^+和K^-0.7的源大小没有显著差异。介子、介子、质子和反质子的任何单子谱都可以用这些强子的横向质量的单指数函数来拟合，并分别推导出这些强子的强子源温度参数。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。

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.