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首页> 外文期刊>Physical review, C >Participant and spectator scaling of spectator fragments in Au plus Au and Cu plus Cu collisions at root s(NN)=19.6 and 22.4 GeV
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Participant and spectator scaling of spectator fragments in Au plus Au and Cu plus Cu collisions at root s(NN)=19.6 and 22.4 GeV

机译：Au Plus Au和Cu Plus Cu碰撞的观众和观众碎片的参与者和观众缩放在根S（NN）= 19.6和22.4 GEV

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摘要

Spectator fragments resulting from relativistic heavy ion collisions, consisting of single protons and neutrons along with groups of stable nuclear fragments up to nitrogen (Z = 7), are measured in PHOBOS. These fragments are observed in Au+Au (root s(NN) = 19.6 GeV) and Cu+Cu (22.4 GeV) collisions at high pseudorapidity (eta). The dominant multiply-charged fragment is the tightly bound helium (alpha), with lithium, beryllium, and boron all clearly seen as a function of collision centrality and pseudorapidity. We observe that in Cu+Cu collisions, it becomes much more favorable for the alpha fragments to be released than lithium. The yields of fragments approximately scale with the number of spectator nucleons, independent of the colliding ion. The shapes of the pseudorapidity distributions of fragments indicate that the average deflection of the fragments away from the beam direction increases for more central collisions. A detailed comparison of the shapes for alpha and lithium fragments indicates that the centrality dependence of the deflections favors a scaling with the number of participants in the collision.
机译：由相对论的重离子碰撞产生的观众片段，由单个质子和中子组成，以及稳定的核碎片组，在PHOBOS中测量。在Au + Au（Root S（NN）= 19.6 GEV）中观察到这些片段（在高伪型（ETA）的Cu + Cu（22.4 gef）碰撞中。主导的乘以充电的片段是紧密束缚的氦（α），锂，铍和硼都清楚地被视为碰撞中心和伪型的函数。我们观察到，在Cu + Cu碰撞中，α碎片比锂释放到更有利。碎片的产量近似与观众核聚体的数量无关，与碰撞离子无关。片段的伪发射分布的形状表明远离光束方向的片段的平均偏转增加，以增加更多的中央碰撞。对α和锂片段的形状的详细比较表明偏转的中心依赖性利用碰撞中的参与者的数量来缩放。

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