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arXiv 1401.0213nucl-ex
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在$\sqrt{s_{NN}}=192.8$ GeV上测量铀-铀碰撞总截面

Measurement of the total cross section of uranium-uranium collisions at $\sqrt{s_{NN}}=192.8$ GeV

W. Fischer, A. J. Baltz, M. Blaskiewicz, D. Gassner, K. A. Drees, Y. Luo, M. Minty, P. Thieberger, M. Wilinski, I. A. Pshenichnov

摘要:

相对论重离子对撞机(RHIC)和大型强子对撞机(LHC)的重离子截面已计算了数百个仓。这些总截面比几何离子-离子截面大一个数量级以上,主要是由于束缚-自由对产生(BFPP)和电磁解离(EMD)。除了在实验上验证计算的普遍兴趣之外,对重离子碰撞中产生的损失的准确预测对于LHC具有实际意义,其中一些碰撞产物在低温冷却的磁体中损失,并且有可能使这些磁体淬灭。在2012年RHIC运行中,铀离子在$\sqrt{s_{NN}} = 192.8$ GeV下相互碰撞,几乎所有的束流损失都是由于碰撞造成的。这允许测量总截面,其在实验误差内与计算的截面一致。

英文摘要:

Heavy ion cross sections totaling several hundred barns have been calculated previously for the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC). These total cross sections are more than an order of magnitude larger than the geometric ion-ion cross sections primarily due to Bound-Free Pair Production (BFPP) and Electro-Magnetic Dissociation (EMD). Apart from a general interest in verifying the calculations experimentally, an accurate prediction of the losses created in the heavy ion collisions is of practical interest for the LHC, where some collision products are lost in cryogenically cooled magnets and have the potential to quench these magnets. In the 2012 RHIC run uranium ions collided with each other at $\sqrt{s_{NN}} = 192.8$ GeV with nearly all beam losses due to collisions. This allows for the measurement of the total cross section, which agrees with the calculated cross section within the experimental error.

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