论文标题
第一个结果是PADME电磁热量表的性能
First results on the performance of the PADME electromagnetic calorimeter
论文作者
论文摘要
PADME实验是在意大利的实验室Nazionali di Frascati举办的，专门用于深色光子搜索。它寻找反应$ e^{+} \，e^{ - } \ rightarrow a'\，γ$，其中$ a'$表示暗光子。 $ 550 \，\ text {mev} $ positrons横梁撞击电子，来自活跃的钻石目标，允许扫描$ a'$ s'u'$ asses'$ 23.7 \，\ text {mev {mev} $。在这种情况下，分割的电磁骑热表起着基本作用，因为它测量了最终的光子四弹药。它由$ 616 $的BGO晶体组成，以$ \ of 29 \，\ text {cm} $半径为$ 5 $ crystals侧的圆柱形形状，以使Bremsstrahlung Radiation Pass限制卡路里仪触发率。每种晶体均由HZC XP1911 B型PhotoLultipliers读取，其信号通过CAEN V1742板数字化，以$ 1 \，\ text {gs/s} $获取$ 1024 $样品。在这里，我们详细报告了量热计采用的解决方案，以及在小型原型和单个闪烁单元上进行的测试中获得的结果。
The PADME experiment, hosted at the Laboratori Nazionali di Frascati in Italy, is dedicated to the dark photon search. It looks for the reaction $e^{+}\,e^{-}\rightarrow A'\,γ$, where $A'$ indicates the dark photon. The $550\,\text{MeV}$ positrons beam that impinges on electrons, coming from an active diamond target, allows to scan $A'$ masses up to $23.7\,\text{MeV}$. In this context, the segmented electromagnetic calorimeter plays a fundamental role, since it measures the final photon four-momentum. It consists of $616$ BGO crystals displaced in a cylindrical shape of $\approx29\,\text{cm}$ radius with a central square hole of $5$ crystals side, to let Bremsstrahlung radiation pass, to limit the calorimeter trigger rate. Each crystal is read by a HZC XP1911 type B photomultipliers and their signal is digitised by means of a CAEN V1742 board, taking $1024$ samples at $1\,\text{GS/s}$. Here we report in detail the solutions adopted for the calorimeter together with the results obtained in tests performed on a small prototype and on single scintillating units.
