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利用强子输运 -弦碎裂模型研究了 2 0 0AGeV重离子碰撞中 Λ多重产生和 Λ / p比率 .研究了它们随反应系统大小和碰撞中心度的变化 .研究表明 Λ和 p多重数都随反应系统增大和随碰撞中心度提高而增大 ,但它们的比率基本保持不变 . Λ的湮没截面大小变化对 Λ的多重数产生有一定影响 ,但对 Λ / p比率影响不大 .结果很好地再现了 pp反应中 Λ/ p比率 .并获得这一比率在AA反应中是pp反应中的 3— 5倍
The multiplicative and Λ / p ratios of 2 0 0 AGeV heavy ion collisions were studied by the hadronic transport-chord fragmentation model, and their changes with the size of the reaction system and the center of collision were studied. The results show that both Λ and p multiple numbers With the increase of the reaction system and the increase of the center of collision, their ratios remain basically unchanged.The change of the annihilation cross-section of Λ has some effect on the multiplicity of Λ, but has little effect on the Λ / p ratio. The Λ / p ratio in the pp reaction is well reproduced, and this ratio is obtained in the AA reaction in the pp reaction 3-5 times