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arXiv 1804.01780physics.ins-dethep-ex
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使用$^{83m}\mathrm{Kr}$衰变校准NEXT-怀特探测器

Calibration of the NEXT-White detector using $^{83m}\mathrm{Kr}$ decays

G. Martínez-Lema, J. A. Hernando Morata, B. Palmeiro, A. Botas, P. Ferrario, F. Monrabal, A. Laing, J. Renner, A. Simón, J. J. Gómez-Cadenas, C. Adams, V. Álvar… 展开作者

G. Martínez-Lema, J. A. Hernando Morata, B. Palmeiro, A. Botas, P. Ferrario, F. Monrabal, A. Laing, J. Renner, A. Simón, J. J. Gómez-Cadenas, C. Adams, V. Álvarez, L. Arazi, C. D. R. Azevedo, K. Bailey, F. Ballester, J. M. Benlloch-Rodríguez, F. I. G. M. Borges, S. Cárcel, J. V. Carrión, S. Cebrián, C. A. N. Conde, J. Díaz, M. Diesburg, J. Escada, R. Esteve, R. Felkai, L. M. P. Fernandes, A. L. Ferreira, E. D. C. Freitas, J. Generowicz, A. Goldschmidt, D. González-Díaz, R. Guenette, R. M. Gutiérrez, K. Hafidi, J. Hauptman, C. A. O. Henriques, A. I. Hernandez, V. Herrero, S. Johnston, B. J. P. Jones, M. Kekic, L. Labarga, P. Lebrun, N. López-March, M. Losada, J. Martín-Albo, A. Martínez, A. D. McDonald, C. M. B. Monteiro, F. J. Mora, J. Muñoz Vidal, M. Musti, M. Nebot-Guinot, P. Novella, D. R. Nygren, A. Para, J. Pérez, M. Querol, J. Repond, S. Riordan, L. Ripoll, J. Rodríguez, L. Rogers, C. Romo, F. P. Santos, J. M. F. dos Santos, C. Sofka, M. Sorel, T. Stiegler, J. F. Toledo, J. Torrent, J. F. C. A. Veloso, R. Webb, J. T. White, N. Yahlalib

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20 pages, 18 figures
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摘要：

NEXT-White（NEW）探测器是目前世界上最大的具有电致发光读出功能的放射纯高压氙气时间投影室。NEXT-White自2016年10月以来一直在Quatuatorio Subterráneo de Canfranc（LSC）运营。本文描述了在2017年3月至11月的长期运行（运行II）期间使用$^{83m}\mathrm{Kr}$衰变进行的校准。氪校准是用来纠正有限的漂移电子寿命，以及对事件的位置，这主要是由立体角覆盖的变化所造成的测量能量的依赖。在产生校准图以校正这两种效应之后，我们测量了41.5 keV点状沉积物的优异能量分辨率（4.553 $\pm$ 0.010（stat.）$\pm$ 0.324（系统））全室中的% FWHM和（3.804 $\pm$ 0.013（统计）$\pm$ 0.112（系统））受限基准体积中的% FWHM。使用初始1/ $\sqrt{E}$缩放，这些值转换为分辨率（0.516 $\pm$ 0.0014（统计））$\pm$ 0.0421（系统））% FWHM和（0.4943 $\pm$ 0.0017（统计）$\pm$ 0.0146（系统））氙双β衰变的$Q_{ββ}$能量（2458 keV）下的% FWHM，完全在我们的目标值1%的范围内。

英文摘要：

The NEXT-White (NEW) detector is currently the largest radio-pure high-pressure xenon gas time projection chamber with electroluminescent readout in the world. NEXT-White has been operating at Laboratorio Subterráneo de Canfranc (LSC) since October 2016. This paper describes the calibrations performed with $^{83m}\mathrm{Kr}$ decays during a long run taken from March to November 2017 (Run II). Krypton calibrations are used to correct for the finite drift-electron lifetime as well as for the dependence of the measured energy on the event position which is mainly caused by variations in solid angle coverage. After producing calibration maps to correct for both effects we measure an excellent energy resolution for 41.5 keV point-like deposits of (4.553 $\pm$ 0.010 (stat.) $\pm$ 0.324 (sys.)) % FWHM in the full chamber and (3.804 $\pm$ 0.013 (stat.) $\pm$ 0.112 (sys.)) % FWHM in a restricted fiducial volume. Using naive 1/$\sqrt{E}$ scaling, these values translate into resolutions of (0.516 $\pm$ 0.0014 (stat.) $\pm$ 0.0421 (sys.)) % FWHM and (0.4943 $\pm$ 0.0017 (stat.) $\pm$ 0.0146 (sys.)) % FWHM at the $Q_{ββ}$ energy of xenon double beta decay (2458 keV), well within range of our target value of 1%.

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