STRASSE：用于RIBF准自由散射测量的硅径迹探测器
STRASSE: A Silicon Tracker for Quasi-free Scattering Measurements at the RIBF
AI总结：
STRASSE是用于RIBF准自由散射测量的新型硅径迹探测器，结合厚液氢靶，实现亚毫米顶点分辨率和优于2 MeV的缺失质量分辨率，以支持缺失质量测量和瞬发γ射线谱学研究。
摘要：
STRASSE（用于SAMURAI实验中放射性核素研究的硅径迹探测器）是一套正在建造的新型探测系统，用于在RIKEN仁科中心的RIBF设施上进行能量为200-250 MeV/核子的准自由散射（QFS）测量。该系统由一个带电粒子硅径迹探测器与一个专用的厚液氢靶（最长可达150毫米）耦合而成，采用紧凑几何结构以适配大型闪烁体或锗探测器阵列。其设计针对利用QFS的两类研究进行了优化：缺失质量测量和飞行中瞬发γ射线谱学。本文描述了（i）为超越现有系统对这两类测量的灵敏度所需的分辨率要求，（ii）基于对装置详细模拟的系统概念设计，以及（iii）其完整的技术实现与挑战。最终径迹探测器的目标是实现亚毫米级的反应顶点分辨率，并预计在与CsI(Na) CATANA阵列结合时，对于(p,2p)反应可达到优于2 MeV（σ）的缺失质量分辨率。
英文摘要：
STRASSE (Silicon Tracker for RAdioactive nuclei Studies at SAMURAI Experiments) is a new detection system under construction for quasi-free scattering (QFS) measurements at 200-250 MeV/nucleon at the RIBF facility of the RIKEN Nishina Center. It consists of a charged-particle silicon tracker coupled with a dedicated thick liquid hydrogen target (up to 150-mm long) in a compact geometry to fit inside large scintillator or germanium arrays. Its design was optimized for two types of studies using QFS: missing-mass measurements and in-flight prompt $γ$-ray spectroscopy. This article describes (i) the resolution requirements needed to go beyond the sensitivity of existing systems for these two types of measurements, (ii) the conceptual design of the system using detailed simulations of the setup and (iii) its complete technical implementation and challenges. The final tracker aims at a sub-mm reaction vertex resolution and is expected to reach a missing-mass resolution below 2 MeV in $σ$ for $(p,2p)$ reactions when combined with the CsI(Na) CATANA array.
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