基于18O(p, γ)19F和27Al(p, γ)28Si共振反应的低能质子束流能量刻度

Energy calibration of low energy proton beam with 18O(p, γ)19F and 27Al(p, γ)28Si resonant reactions

    摘要
  • 摘要: 长时间稳定运行的低能强流质子加速器对低能核天体物理实验至关重要．中国科学院合肥物质科学研究院的HINEG(high intensity D-T fusion neutron generator)高压平台，目前可以为核天体物理实验在70~260 keV能量范围内提供最大5 mA的质子束流．基于此强流加速器装置，我们搭建了核天体物理实验测量平台，利用已知的18O(p, γ)19F和27Al(p, γ)28Si共振反应对加速器束流能量进行了刻度，通过Geant4模拟给出了束流能量的偏移量和展宽．测试结果表明，质子束流能量在151.3和222.8 keV附近的能量偏移分别为(0.3±0.3)和(1.7±0.1) keV，展宽分别为 0.97_-0.05^+0.02和1.39_-0.28^+0.12 keV．该结果表明，HINEG的束流满足低能核天体物理实验的要求．

     

    Abstract: Low energy, high current proton accelerators, which can run stably for a long period, are crucial for low-energy nuclear astrophysical experiments．The HINEG(high intensity D-T fusion neutron generator) high-voltage platform at Hefei Institute of Physical Sciences, Chinese Academy of Sciences, can provide a proton beam up to 5 mA in the energy range of 70-260 keV．This high current accelerator was used to build a low-energy nuclear astrophysical platform．The beam energy was calibrated with 18O(p, γ)19F and 27Al(p, γ)28Si resonant reactions．Data were analyzed by Geant4 simulation．Simulations showed that for proton beams of 151.3 and 222.8 keV, energy spread was 0.97_-0.05^+0.02 and 1.39_-0.28^+0.12 keV, energy shift was (0.3±0.3) and (1.7±0.1) keV respectively．The HINEG platform satisfies requirements for nuclear astrophysics studies．

     

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