AI 中文总结
该研究对六个定制大体积锥形LYSO晶体性能进行报告，先测纵向响应均匀性，再用正电子束表征能量和时间分辨率，其能量、时间分辨率良好，还测得空间分辨率，满足PIONEER量能器测量罕见π介子衰变关键设计参数。
AI 中文摘要
我们报告了六个定制的前所未有的大体积锥形LYSO晶体的性能，它们构成了计划用于PIONEER实验的19辐射长度电磁量能器的一个扇区。在保罗·谢尔研究所使用20至80 MeV正电子束表征阵列中晶体的能量和时间分辨率之前，先用放射性源测量了每个晶体的纵向响应均匀性。该阵列在能量高于40 MeV时能量分辨率优于2%，在能量高于30 MeV时时间分辨率优于130 ps。在阵列中心区域测量的空间分辨率在70 MeV时为4.9 mm，通过Geant4模拟在30 mm半径区域外推至5.4 mm。测量的特性满足PIONEER量能器测量罕见π介子衰变的关键设计参数。
英文摘要
We report on the performance of six custom-made tapered LYSO crystals of unprecedented volume, which constitute a sector of the 19 radiation length electromagnetic calorimeter planned for the PIONEER experiment. The longitudinal response uniformity of each crystal was measured using radioactive sources before characterizing the energy and time resolution of the crystals in an array using a 20 to 80 MeV positron beam at the Paul Scherrer Institute. The array demonstrated an energy resolution better than 2 % for energies above 40 MeV and a time resolution better than 140 ps for energies above 30 MeV. The spatial resolution was measured in the central region of the array to be 5.06 mm in x and 5.20 mm in y at 70 MeV. The measured properties satisfy the key design parameters of the PIONEER calorimeter for the measurement of rare pion decays.
Comments19 pages, 16 figures
