标题： 负强子观测的40 A GeV/c下Pb-Pb碰撞的膨胀动力学 显示英文标题

标题： Expansion dynamics of Pb-Pb collisions at 40 A GeV/c viewed by negatively charged hadrons

摘要： 在本文中，我们介绍了在40 A GeV/c束流动量下测量的负电荷强子的横向质量谱和Hanbury-Brown和Twiss关联函数的结果，这些强子预计主要是负π介子。 基于这些数据，在对应于Pb-Pb非弹性截面最中心53%的中心度范围内，研究了碰撞动力学以及热冻结时系统的时空范围。 讨论了与奇异粒子冻结条件以及其他实验的HBT结果的比较。 显示英文摘要

摘要： In this paper we present results on transverse mass spectra and Hanbury-Brown and Twiss correlation functions of negatively charged hadrons, which are expected to be mostly negative pions, measured in Pb-Pb collisions at 40 A GeV/c beam momentum. Based on these data, the collision dynamics and the space-time extent of the system at the thermal freeze-out are studied over a centrality range corresponding to the most central 53% of the Pb--Pb inelastic cross section. Comparisons with freeze-out conditions of strange particles and HBT results from other experiments are discussed.