arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2209.13488nucl-exhep-ex
收藏

中子与氩核在95至720 MeV能区的截面测量

Measurement of the Neutron Cross Section on Argon Between 95 and 720 MeV

S. Martynenko, B. Bhandari, J. Bian, K. Bilton, C. Callahan, J. Chaves, H. Chen, D. Cline, R. L. Cooper, D. L. Danielson, J. Danielson, N. Dokania, S. Elliott, … 展开作者

S. Martynenko, B. Bhandari, J. Bian, K. Bilton, C. Callahan, J. Chaves, H. Chen, D. Cline, R. L. Cooper, D. L. Danielson, J. Danielson, N. Dokania, S. Elliott, S. Fernandes, S. Gardiner, G. Garvey, V. Gehman, F. Giuliani, S. Glavin, M. Gold, C. Grant, E. Guardincerri, T. Haines, A. Higuera, J. Y. Ji, R. Kadel, N. Kamp, A. Karlin, W. Ketchum, L. W. Koerner, D. Lee, K. Lee, Q. Liu, S. Locke, W. C. Louis, J. Maricic, E. Martin, M. J. Martinez, C. Mauger, C. McGrew, J. Medina, P. J. Medina, A. Mills, G. Mills, J. Mirabal-Martinez, A. Olivier, E. Pantic, B. Philipbar, C. Pitcher, V. Radeka, J. Ramsey, K. Rielage, M. Rosen, A. R. Sanchez, J. Shin, G. Sinnis, M. Smy, W. Sondheim, I. Stancu, C. Sterbenz, Y. Sun, R. Svoboda, C. Taylor, A. Teymourian, C. Thorn, C. E. Tull, M. Tzanov, R. G. Van de Water, D. Walker, N. Walsh, H. Wang, Y. Wang, C. Yanagisawa, A. Yarritu, J. Yoo

AI总结:

该研究在95-720 MeV能区测量中子与氩核的截面,通过改进分析方法和扩大 fiducial 体积,提高了统计量,并在五个飞行时间区域给出精确的截面值。

摘要:

我们报告了在95-720 MeV能量范围内中子与氩核截面的扩展测量。该测量基于在LANL的WNR/LANSCE束流上对Mini-CAPTAIN探测器进行4.3小时曝光获得的数据。与先前对同一数据的分析相比,本次扩展分析重新评估了系统不确定性,特别是与探测器上游部分未使用线相关的部分。利用这些信息,我们将实验中的 fiducial 体积加倍,并将统计量提高了2.4倍。我们还将分析从能量分箱改为飞行时间分箱。这一改变缩小了整体考虑的能量范围,但提高了对每个分箱内入射中子能谱的理解。总体而言,新测量结果来自对五个飞行时间区域中子通量衰减的拟合:140 ns-180 ns、120 ns-140 ns、112 ns-120 ns、104 ns-112 ns、96 ns-104 ns。最终截面以每个飞行时间分箱的通量平均能量给出:σ(146 MeV)=0.60^{+0.14}_{-0.14}±0.08(系统)b,σ(236 MeV)=0.72^{+0.10}_{-0.10}±0.04(系统)b,σ(319 MeV)=0.80^{+0.13}_{-0.12}±0.040(系统)b,σ(404 MeV)=0.74^{+0.14}_{-0.09}±0.04(系统)b,σ(543 MeV)=0.74^{+0.09}_{-0.09}±0.04(系统)b。

英文摘要:

We report an extended measurement of the neutron cross section on argon in the energy range of 95-720 MeV. The measurement was obtained with a 4.3-hour exposure of the Mini-CAPTAIN detector to the WNR/LANSCE beam at LANL. Compared to an earlier analysis of the same data, this extended analysis includes a reassessment of systematic uncertainties, in particular related to unused wires in the upstream part of the detector. Using this information we doubled the fiducial volume in the experiment and increased the statistics by a factor of 2.4. We also shifted the analysis from energy bins to time-of-flight bins. This change reduced the overall considered energy range, but improved the understanding of the energy spectrum of incoming neutrons in each bin. Overall, the new measurements are extracted from a fit to the attenuation of the neutron flux in five time-of-flight regions: 140 ns - 180 ns, 120 ns - 140 ns, 112 ns - 120 ns, 104 ns - 112 ns, 96 ns - 104 ns. The final cross sections are given for the flux-averaged energy in each time-of-flight bin: $σ(146~\rm{MeV})=0.60^{+0.14}_{-0.14}\pm0.08$(syst) b, $σ(236~\rm{MeV})=0.72^{+0.10}_{-0.10}\pm0.04$(syst) b, $σ(319~\rm{MeV})=0.80^{+0.13}_{-0.12}\pm0.040$(syst) b, $σ(404~\rm{MeV})=0.74^{+0.14}_{-0.09}\pm0.04$(syst) b, $σ(543~\rm{MeV})=0.74^{+0.09}_{-0.09}\pm0.04$(syst) b.

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。

↑