用电子束测试LYSO基质
Test of a LYSO matrix with an electron beam
摘要：
KLOE-2电磁量能器的角覆盖范围从20 $^{\circ}$的极角扩展到$8^{\circ}$，将增加实验的多光子探测能力，从而增强对稀有K介子、$η$和$η'$瞬发衰变通道的搜索范围。量热计扩展的基本布局由两个小桶的LYSO晶体读出APD光电传感器，旨在实现300和500 ps之间的20 MeV光子的定时分辨率。2009年4月，在INFN Nazionali di Frascati的束流测试设施，使用100至500 MeV的电子束，对用于这种探测器的（5.5 $\times6\times$ 13）cm $^3$原型进行了第一次测试。在所选的能量范围内，我们测量到500 $÷$ 800 p.e./ Mev，能量分辨率可以参数化为$0.05 \oplus 0.01/({\rm E/GeV}) \oplus 0.015/\sqrt{\rm{E/GeV}}$，位置分辨率为2.8 mm，时间分辨率为200 $÷$ 300 ps。
英文摘要：
The angular coverage extension of the KLOE-2 electromagnetic calorimeter, from a polar angle of 20$^{\circ}$ down to $8^{\circ}$, will increase the multiphoton detection capability of the experiment enhancing the search reach for rare kaon, $η$ and $η'$ prompt decay channels. The basic layout of the calorimeter extension consists of two small barrels of LYSO crystals readout with APD photosensors aiming to achieve a timing resolution between 300 and 500 ps for 20 MeV photons. The first test of a (5.5$\times6\times$13) cm$^3$ prototype for such a detector was carried out in april 2009 at the Beam Test Facility of Laboratori Nazionali di Frascati of INFN with an electron beam from 100 to 500 MeV. In the selected energy range, we measured a light yield of 500$÷$800 p.e./Mev, an energy resolution which can be parametrized as $0.05 \oplus 0.01/({\rm E/GeV}) \oplus 0.015/\sqrt{\rm{E/GeV}}$, a position resolution of 2.8 mm and a timing resolution of 200$÷$300 ps.
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