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arXiv physics/0312128physics.ins-dethep-ex
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在BaBar的CsI(Tl)量热计上用中子活化液源系统标定绝对能量

Absolute Energy Calibration with the Neutron-Activated Liquid-Source System at BaBar's CsI(Tl) Calorimeter

Johannes M. Bauer

摘要:

BaBar探测器上的电磁量热计是SLAC非对称B工厂的一部分,它以良好的分辨率测量能量范围从20 MeV到8 GeV的光子。在低能端用从液体源系统获得的6.13 MeV光子校准量热计。在校准过程中,富氟液体通过中子发生器激活,并泵送通过热量计晶体的前部。发生在晶体前面的衰变会发射出具有明确能量的光子,这些光子可以通过常规数据采集系统在晶体中检测到。液体源系统在量热计前仅添加非常少的材料,几乎不需要维护,并且允许在具有最小安全危险的钥匙开关处进行操作。该报告介绍了该系统,介绍了自1999年以来从其运行中获得的校准结果,显示了晶体由于辐射损坏而损失的光输出,并分享了多年来取得的经验。

英文摘要:

The electro-magnetic calorimeter at the BaBar detector, part of the asymmetric B Factory at SLAC, measures photons in the energy range from 20 MeV to 8 GeV with good resolution. The calorimeter is calibrated at the low energy end with 6.13 MeV photons obtained from a liquid source system. During the calibration, a fluorine-rich liquid is activated via a neutron generator and pumped past the front of the calorimeter's crystals. Decays that occur in front of the crystals emit photons of well-defined energy, which are detected in the crystals with the regular data acquisition system. The liquid source system adds only very little material in front of the calorimeter, needs nearly no maintenance, and allows operation at the switch of a key with minimal safety hazards. The report describes the system, presents calibration results obtained from its operation since 1999, shows the crystals' loss of light yield due to radiation damage, and shares experiences gained over the years.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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