【摘 要】
:
用相对论输运模型模拟了束流动能为520MeV/u的238U238U碰撞实验.研究了在两种极端对撞方位的UU碰撞中,末态核子和π介子椭圆流v2与碰撞参数、快度以及横动量的依赖关系.研究
【机 构】
:
华中师范大学粒子物理研究所,中国科学技术大学
论文部分内容阅读
用相对论输运模型模拟了束流动能为520MeV/u的238U238U碰撞实验.研究了在两种极端对撞方位的UU碰撞中,末态核子和π介子椭圆流v2与碰撞参数、快度以及横动量的依赖关系.研究表明,由于挤压(squeeze-out)效应,末态核子和π具有负的椭圆流;体-体UU中心碰撞事件具有最大初始坐标空间形变,因而具有最大的负的椭圆流,约12%;在最小无偏事件样本下,体-体和头-头碰撞,中央快度平台上的核子椭圆流大小相当,而前者π椭圆流略大于后者;在中央快度平台,低横动量核子和π主要由反应后期△衰变得到,而高横动量主要是参与核子再散射生成,因而在低横动量区它们具有相似的流,而在较高横动量区(>0.3GeV/c)由于旁观核子的再散射和吸收效应,它们的椭圆流有明显压低.
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