CHEMICAL-POTENTIALS OF PI- AND PI+ IN HEAVY-ION COLLISIONS

被引：18

作者：

GORENSTEIN, MI ^{[1
]}

YANG, SN ^{[1
]}

机构：

[1] NATL TAIWAN UNIV, DEPT PHYS, TAIPEI 10764, TAIWAN

来源：

PHYSICAL REVIEW C | 1991年 / 44卷 / 06期

关键词：

D O I：

10.1103/PhysRevC.44.2875

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We consider a chemical nonequilibrium model to describe the pion production in Ar+KCl and La+La collisions at initial energies E(lab) = 0.5-1.8 GeV/nucleon. The excess of low-energy pi- is interpreted as the manifestation of positive chemical potential of pi- at the thermal freeze-out. We find that in collisions between nuclei with large atomic numbers the chemical potential of pi+ is smaller than that of pi-. This leads to the prediction of much less excess of low-energy pi+, than as measured in the pi- case, in heavy-ion collisions at bombarding energies in the region of 1 GeV/nucleon.

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页码：2875 / 2877

页数：3

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