Monte Carlo simulation of recoil trajectories in the gas-filled recoil separator SHANS2 using Geant4 toolkit

IF 1.5 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 : 2026-06-01 Epub Date: 2026-02-10 DOI:10.1016/j.nima.2026.171376

M.M. Zhang , D.I. Solovyev , S. Kuzovlev , S.Y. Xu , Z.Y. Zhang , Z.G. Gan

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引用次数: 0

Abstract

A Monte Carlo simulation model based on Geant4 toolkit has been developed to simulate the production of heavy-nuclei recoils and their trajectories through the gas-filled recoil separator SHANS2 (Spectrometer for Heavy Atoms and Nuclear Structure-2). Methods of the simulation model are presented and several physics processes were implemented in Geant4. A set of average charge states of heavy ions measured at SHANS2 in helium gas are presented and a new empirical formula based on the experimental data was derived to describe the charge-exchange process. The simulated results for the focal plane image size of recoils, magnetic rigidity dispersion, and transmission efficiency were compared with the data obtained in ¹⁶⁹Tm(⁴⁰Ar, 4-5n)

^{204, 205}

Fr and ²⁰⁸Pb(⁴⁸Ca, 2n)²⁵⁴No reactions. Good agreement between simulation and experimental results is found, which allows us to use the model for tuning the separator in future experiments aimed at investigations of the heaviest nuclei.

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利用Geant4工具对充气后坐力分离器SHANS2的后坐力轨迹进行蒙特卡罗仿真

建立了基于Geant4工具的蒙特卡罗模拟模型，模拟了重核反冲的产生及其通过充气反冲分离器SHANS2 （Spectrometer for Heavy Atoms and Nuclear Structure-2）的轨迹。提出了仿真模型的方法，并在Geant4中实现了多个物理过程。本文给出了在氦气中SHANS2测量的一组重离子的平均电荷态，并根据实验数据导出了描述电荷交换过程的经验公式。将模拟结果与169Tm(40Ar, 4-5n)204,205Fr和208Pb(48Ca, 2n)254No反应的焦平面图像尺寸、磁刚度色散和透射效率进行了比较。模拟结果与实验结果吻合较好，这使我们能够在今后研究最重核的实验中使用该模型来调整分离器。

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.