Tagging of isobars using energy loss and time-of-flight measurements
Tagging of isobars using energy loss and time-of-flight measurements
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DOI：
10.1109/nssmic.2001.1008399
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发表时间：
2001-11
期刊：
影响因子：
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通讯作者：
D. Shapira;T. A. Lewis;P. Mueller
中科院分区：
文献类型：
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作者：
D. Shapira;T. A. Lewis;P. Mueller
对利用飞行时间测量能量损失来标记混合光束中等压线的技术进行了试验。使用这种方法，允许更多的能量损失（更厚的吸收剂）可以改善等压线分离，但前提是可以控制吸收剂的均匀性。利用碰撞和电荷交换对能量散射的贡献，在这种条件下得到的束流能量损失和能量扩散的测量结果与预测值接近。通过计算能量差，我们可以研究该方法在不同质量范围和光束能量下对等压线分离的效果。分离在最困难的情况下，分析了能量接近3mev / a的a = 132等压线束。飞行时间信息可以作为感兴趣事件的数据流的附加标记在线添加。这样一个事件接一个事件的标记使人们能够研究光束中等压混合物的差异对反应结果的影响，即使在等压分离不完全的情况下。
The technique for tagging isobars in a mixed beam by measuring energy loss by time-of-flight has been tested. With this method, isobar separation should improve by allowing more energy loss (thicker absorber), but only if one can control absorber homogeneity. Measurements of beam energy loss and energy spread obtained under such conditions were shown to be close to predicted values using both collisional and charge exchange contributions to energy straggling. The calculation of energy straggling allows us to study the efficacy of this method for isobar separation when applied to different mass ranges and beam energies. Separation in a most difficult case, an analyzed beam of A = 132 isobars at energies near 3 MeV/A has been demonstrated. The time-of-flight information can be added on line as an additional tag to the data stream for events of interest. Such event by event tagging enables one to study the effect of differences in isobaric mixture in the beam on the reaction outcome even when isobar separation is not complete.