论文标题

在95至720 MEV之间的氩气中子横截面的测量

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

论文作者

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

论文摘要

我们报告了在95-720 MEV的能量范围内对中子横截面的扩展测量。通过在LANL处的WNR/LANSCE束接触4.3小时,可获得测量。与对相同数据的较早分析相比,该扩展分析包括对系统不确定性的重新评估,特别是与检测器上游部分未使用的电线有关。使用此信息,我们将基准量增加一倍,并将统计数据提高了2.4倍。我们还将分析从能量箱转移到飞行箱。这种变化减少了总体考虑的能量范围,但改善了每个垃圾箱中中子的能量谱的理解。总体而言,新的测量值是从五个飞行时间区域中中子通量的衰减到衰减的:140 ns -180 ns -180 ns,120 ns -140 ns -140 ns,112 NS -120 NS -120 NS,104 NS,104 NS -112 NS,96 NS -96 NS -104 NS。在每个飞行箱中给出了通量平均能量的最终横截面:$σ($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^{+0.80^{+0.13} $σ(404〜 \ rm {mev})= 0.74^{+0.14} _ { - 0.09} \ pm0.04 $(syst)b,$σ(543〜 \ rm {mev})= 0.74^= 0.74^{+0.09} {+0.09} _ {+0.09} _ { - 0.09}} n.0.09} n.0.0.0.0.0.0.0.0.0.0.0.0.0.0.09} b.an.

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.

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