重离子碰撞中(反)质子和π介子源尺寸及相空间密度
摘要
NA44在CERN SPS上测量了sqrt{s}=18 GeV/A下AA碰撞的中心快度氘核谱。将这些谱与已发表的质子、反质子和反氘核数据相结合，使我们能够在聚变框架内计算质子和反质子源尺寸及相空间密度。这些结果与π介子源尺寸和密度、pA结果以及较低能量(AGS)数据进行了比较。在sqrt{s}=18 GeV/A下，反质子源大于质子源。π介子和质子的相空间密度不是恒定的，而是随系统尺寸增大而增加。π⁺和质子的半径都随横向质量减小，并随sqrt{s}增加。π介子和质子并非独立冻结。它们相互作用的性质随sqrt{s}变化，且π介子/质子比增加。
引用
@article{arxiv.nucl-ex/0008006,
title = {(Anti)Proton and Pion Source Sizes and Phase Space Densities in Heavy Ion Collisions},
author = {Michael Murray},
journal= {arXiv preprint arXiv:nucl-ex/0008006},
year = {2009}
}
备注
4 pages, Latex 2.09, 3 eps figures. Changes for January 2001. The proton source size is now calculated assuming a more realistic Hulthen, rather than Gaussian, wavefunction. A new figure shows the effect of this change which is important for small radii. A second new figure shows the results of RQMD calculations of the proton source size and phase density. Because of correlations between position and momentum coalesence does not show the full proton source size. The paper has been streamlined and readability improved