来自Borexino的太阳CNO周期的中微子的敏感性

论文标题

来自Borexino的太阳CNO周期的中微子的敏感性

Sensitivity to neutrinos from the solar CNO cycle in Borexino

论文作者

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

论文摘要

在碳，氮，氧（CNO）融合循环中排放的中微子是太阳中微子的次级优势但至关重要的成分，其通量尚未测量。由于探测器的放射线和对探测器背景的精确理解，在实验室Nazionali del Gran Sasso（意大利）实验室的Borexino实验具有独特的机会。我们讨论了Borexino对CNO中微子的敏感性，该中微子基于我们采用的策略来限制两个最相关的背景源的速率，即来自太阳能链和BI-210β衰减的PEP Neutrinos，源自PB-210的液体闪光剂的固有污染。假设高金属性标准太阳能模型预测的CNO通量和1000天x71.3 t的暴露，则Borexino对CNO Neutrino的中微子中微子的敏感性高于3 Sigma。有了相同的假设，CNO中微子通量的预期实验不确定性为23％，前提是对BI-210相互作用速率的独立估计值为1.5 cpd/100t。最后，我们评估了C和N丰度的预期不确定性以及高金属和低金属标准太阳能模型（HZ和LZ）之间的预期歧视意义，未来对CNO太阳中微子通量的测量更为精确。

Neutrinos emitted in the carbon, nitrogen, oxygen (CNO) fusion cycle in the Sun are a sub-dominant, yet crucial component of solar neutrinos whose flux has not been measured yet. The Borexino experiment at the Laboratori Nazionali del Gran Sasso (Italy) has a unique opportunity to detect them directly thanks to the detector's radiopurity and the precise understanding of the detector backgrounds. We discuss the sensitivity of Borexino to CNO neutrinos, which is based on the strategies we adopted to constrain the rates of the two most relevant background sources, pep neutrinos from the solar pp-chain and Bi-210 beta decays originating in the intrinsic contamination of the liquid scintillator with Pb-210. Assuming the CNO flux predicted by the high-metallicity Standard Solar Model and an exposure of 1000 daysx71.3 t, Borexino has a median sensitivity to CNO neutrino higher than 3 sigma. With the same hypothesis the expected experimental uncertainty on the CNO neutrino flux is 23%, provided the uncertainty on the independent estimate of the Bi-210 interaction rate is 1.5 cpd/100t. Finally, we evaluated the expected uncertainty of the C and N abundances and the expected discrimination significance between the high and low metallicity Standard Solar Models (HZ and LZ) with future more precise measurement of the CNO solar neutrino flux.

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