用于探测η核束缚态的大接收scintillator探测器
A large acceptance scintillator detector with wavelength shifting fibre read-out for search of eta-nucleus bound states
摘要：
设计并建造了一个波长移动光纤读出的大接收闪烁探测器，用于探测$η$ -核束缚系统（即所谓的$η$ -介子核）的衰变粒子，即质子和π介子。该探测器被命名为ENSTAR探测器，由122块不同形状和尺寸的塑料闪烁体组成，它们以圆柱形几何形状排列，以提供粒子识别，能量损失和这些粒子的粗略位置信息。在本探测器的设计中，获得了总共4个$π$的$\sim$ 95%的立体角覆盖。蒙特卡罗相空间计算模拟$η$介子核的形成和衰变表明，它的衰变粒子，质子和π介子发射的张开角为150 $^\circ \pm 20^\circ$，能量范围分别为25至300 MeV和225至450 MeV。详细的GEANT模拟表明，$\sim$ 80%的衰变粒子（质子和π介子）可以在ENSTAR中检测到。利用α源、宇宙线μ子等对ENSTAR闪烁体的响应进行了多次实验测量。利用COSY冷却器同步加速器的动量为870 MeV/c的质子束流对全组装的探测器进行了在束测试。测试结果表明，探测器所选用的闪烁体光纤设计表现令人满意。本文介绍了探测器的设计，模拟研究，结构细节和测试结果。
英文摘要：
A large acceptance scintillator detector with wavelength shifting optical fibre readout has been designed and built to detect the decay particles of $η$-nucleus bound system (the so-called $η$-mesic nuclei), namely, protons and pions. The detector, named as ENSTAR detector, consists of 122 pieces of plastic scintillator of various shapes and sizes, which are arranged in a cylindrical geometry to provide particle identification, energy loss and coarse position information for these particles. A solid angle coverage of $\sim$95% of total 4$π$ is obtained in the present design of the detector. Monte Carlo phase space calculations performed to simulate the formation and decay of $η$-mesic nuclei suggest that its decay particles, the protons and pions are emitted with an opening angle of 150$^\circ \pm 20^\circ$, and with energies in the range of 25 to 300 MeV and 225 to 450 MeV respectively. The detailed GEANT simulations show that $\sim$ 80 % of the decay particles (protons and pions) can be detected within ENSTAR. Several test measurements using alpha source, cosmic-ray muons etc. have been carried out to study the response of ENSTAR scintillator pieces. The in-beam tests of fully assembled detector with proton beam of momentum 870 MeV/c from the Cooler synchrotron COSY have been performed. The test results show that the scintillator fiber design chosen for the detector has performed satisfactorily well. The present article describes the detector design, simulation studies, construction details and test results.
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。
