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用几何模型计算了相对论重离子碰撞中产生的Ｊ／ 在核物质中的吸收长度．由此导得的Ｊ／ 在Ａ－Ａ碰撞中的吸收截面比在ｈ－Ａ过程中明显增大．通过对 与初态相互作用长度的关系的分析，说明了本文结果与过去工作不同的原因．
The geometrical model was used to calculate the absorption length of J / in nuclear matter produced by the relativistic heavy ion collisions. The resulting J / A absorption cross section in the A-A collision is significantly higher than in the h-A process. Through the analysis of the relationship with the initial state length of interaction, we illustrate the reasons why the result of this paper differs from the past work.