Annihilation vertex reconstruction algorithm with single-layer Timepix4 detectors

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2025-08-23 DOI:10.1016/j.nima.2025.170958

V. Kraxberger , A. Gligorova , E. Widmann

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Abstract

A study of antiproton–nucleus annihilations at rest on a variety of thin solid targets using slow extracted antiprotons is being prepared. To detect the charged annihilation products, the experiment will employ seven Timepix4 ASICs coupled to 500 µm thick silicon sensors. These will be arranged in a cuboid geometry that covers the majority of the full solid angle around the target, enabling precise tracking of outgoing particles using only one layer of detectors. With these novel chips, the annihilation will be studied by measuring the total multiplicity, energy, and angular distribution of various prongs produced in a number of targets.

A 3D reconstruction algorithm for determining the annihilation vertex from particle tracks in the single-plane detectors has been developed using Monte Carlo simulations. This allows for event-by-event reconstruction, making it possible to distinguish antiproton annihilations on the target from those occurring elsewhere. The measurements will also enable a study of possible final state interactions triggered by the primary annihilation mesons, their evolution with the nuclear mass and their branching ratios.

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基于单层Timepix4检测器的湮灭顶点重建算法

利用慢速提取的反质子在各种薄固体靶上进行反质子-核湮灭的研究。为了检测带电湮灭产物，实验将使用7个Timepix4 asic与500µm厚的硅传感器耦合。这些探测器将被布置成一个长方体几何形状，覆盖了目标周围的大部分立体角，仅使用一层探测器就可以精确跟踪出射粒子。利用这些新型芯片，将通过测量在多个目标中产生的各种尖头的总复数、能量和角分布来研究湮灭。利用蒙特卡罗模拟，提出了一种从单平面探测器中粒子轨迹确定湮灭顶点的三维重建算法。这允许逐个事件重建，使区分目标上的反质子湮灭与其他地方发生的反质子湮灭成为可能。这些测量还将使研究可能由初级湮灭介子引发的最终态相互作用、它们随核质量和分支比的演化成为可能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment 物理-光谱学

CiteScore

3.20

自引率

21.40%

发文量

787

审稿时长

1 months

期刊介绍： Section A of Nuclear Instruments and Methods in Physics Research publishes papers on design, manufacturing and performance of scientific instruments with an emphasis on large scale facilities. This includes the development of particle accelerators, ion sources, beam transport systems and target arrangements as well as the use of secondary phenomena such as synchrotron radiation and free electron lasers. It also includes all types of instrumentation for the detection and spectrometry of radiations from high energy processes and nuclear decays, as well as instrumentation for experiments at nuclear reactors. Specialized electronics for nuclear and other types of spectrometry as well as computerization of measurements and control systems in this area also find their place in the A section. Theoretical as well as experimental papers are accepted.