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arXiv 2109.04770hep-exphysics.ins-det
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Borexino中sub-MeV太阳中微子的关联和积分方向性

Correlated and Integrated Directionality for sub-MeV solar neutrinos in Borexino

M. Agostini, K. Altenmüller, S. Appel, V. Atroshchenko, Z. Bagdasarian, D. Basilico, G. Bellini, J. Benziger, R. Biondi, D. Bravo, B. Caccianiga, F. Calaprice, … 展开作者

M. Agostini, K. Altenmüller, S. Appel, V. Atroshchenko, Z. Bagdasarian, D. Basilico, G. Bellini, J. Benziger, R. Biondi, D. Bravo, B. Caccianiga, F. Calaprice, A. Caminata, P. Cavalcante, A. Chepurnov, D. D'Angelo, S. Davini, A. Derbin, A. Di Giacinto, V. Di Marcello, X. F. Ding, A. Di Ludovico, L. Di Noto, I. Drachnev, A. Formozov, D. Franco, C. Galbiati, C. Ghiano, M. Giammarchi, A. Goretti, A. S. Göttel, M. Gromov, D. Guffanti, Aldo Ianni, Andrea Ianni, A. Jany, D. Jeschke, V. Kobychev, G. Korga, S. Kumaran, M. Laubenstein, E. Litvinovich, P. Lombardi, I. Lomskaya, L. Ludhova, G. Lukyanchenko, L. Lukyanchenko, I. Machulin, J. Martyn, E. Meroni, M. Meyer, L. Miramonti, M. Misiaszek, V. Muratova, B. Neumair, M. Nieslony, R. Nugmanov, L. Oberauer, V. Orekhov, F. Ortica, M. Pallavicini, L. Papp, L. Pellicci, Ö. Penek, L. Pietrofaccia, N. Pilipenko, A. Pocar, G. Raikov, M. T. Ranalli, G. Ranucci, A. Razeto, A. Re, M. Redchuk, A. Romani, N. Rossi, S. Schönert, D. Semenov, G. Settanta, M. Skorokhvatov, A. Singhal, O. Smirnov, A. Sotnikov, Y. Suvorov, R. Tartaglia, G. Testera, J. Thurn, E. Unzhakov, A. Vishneva, R. B. Vogelaar, F. von Feilitzsch, A. Wessel, M. Wojcik, B. Wonsak, M. Wurm, S. Zavatarelli, K. Zuber, G. Zuzel

摘要:

液体闪烁体探测器在各种中微子源的探测中起着核心作用。特别是,它是迄今为止唯一用于亚MeV太阳中微子精确光谱学的技术,正如意大利格兰萨索国家实验室的Borexino实验所证明的那样。高的光产额的好处,因此低的能量阈值和良好的能量分辨率,是在水切伦科夫探测器的方向信息的成本,测量$^8$ B太阳中微子超过几兆电子伏的特点。在本文中,我们提供了第一次测量的亚MeV太阳中微子的方向性,利用在每个事件中的第一个几个检测到的光子和已知的位置的太阳每个事件之间的相关性。这也是中微子在液体闪烁体靶中弹性散射电子的方向性的第一个特征。该测量利用了在主导但较慢的闪烁光信号之前的次主导的快速切伦科夫光发射。通过这一测量,我们还能够提取出Borexino中的$^{7}$ Be太阳中微子的速率。在传统的液体闪烁体目标的方向灵敏度的演示铺平了道路,可能利用的切伦科夫光信号在未来的吨级实验中使用液体闪烁体目标。方向性对于背景抑制以及来自各种源的信号的解纠缠是重要的。

英文摘要:

Liquid scintillator detectors play a central role in the detection of neutrinos from various sources. In particular, it is the only technique used so far for the precision spectroscopy of sub-MeV solar neutrinos, as demonstrated by the Borexino experiment at the Gran Sasso National Laboratory in Italy. The benefit of a high light yield, and thus a low energy threshold and a good energy resolution, comes at the cost of the directional information featured by water Cherenkov detectors, measuring $^8$B solar neutrinos above a few MeV. In this paper we provide the first directionality measurement of sub-MeV solar neutrinos which exploits the correlation between the first few detected photons in each event and the known position of the Sun for each event. This is also the first signature of directionality in neutrinos elastically scattering off electrons in a liquid scintillator target. This measurement exploits the sub-dominant, fast Cherenkov light emission that precedes the dominant yet slower scintillation light signal. Through this measurement, we have also been able to extract the rate of $^{7}$Be solar neutrinos in Borexino. The demonstration of directional sensitivity in a traditional liquid scintillator target paves the way for the possible exploitation of the Cherenkov light signal in future kton-scale experiments using liquid scintillator targets. Directionality is important for background suppression as well as the disentanglement of signals from various sources.

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。

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