7Be Solar Neutrino Measurement with KamLAND
A. Gando, Y. Gando, H. Hanakago, H. Ikeda, K. Inoue, K. Ishidoshiro,, H. Ishikawa, Y. Kishimoto, M. Koga, R. Matsuda, S. Matsuda, T. Mitsui, D., Motoki, K. Nakajima, K. Nakamura, A. Obata, A. Oki, Y. Oki, M. Otani, I., Shimizu, J. Shirai, A. Suzuki, K. Tamae, K. Ueshima

TL;DR
This paper reports a measurement of 7Be solar neutrinos using KamLAND, determining the neutrino flux and survival probability, and confirming consistency with the standard solar model through a global oscillation analysis.
Contribution
First measurement of 7Be solar neutrino flux with KamLAND, providing data for neutrino oscillation and solar model validation.
Findings
Measured 7Be neutrino flux of (3.26 +/- 0.50) x 10^9 cm^-2s^-1
Determined electron neutrino survival probability of 0.66 +/- 0.14
Total 7Be neutrino flux consistent with solar model predictions
Abstract
We report a measurement of the neutrino-electron elastic scattering rate of 862 keV 7Be solar neutrinos based on a 165.4 kton-day exposure of KamLAND. The observed rate is 582 +/- 90 (kton-day)^-1, which corresponds to a 862 keV 7Be solar neutrino flux of (3.26 +/- 0.50) x 10^9 cm^-2s^-1, assuming a pure electron flavor flux. Comparing this flux with the standard solar model prediction and further assuming three flavor mixing, a nu_e survival probability of 0.66 +/- 0.14 is determined from the KamLAND data. Utilizing a global three flavor oscillation analysis, we obtain a total 7Be solar neutrino flux of (5.82 +/- 0.98) x 10^9 cm^-2s^-1, which is consistent with the standard solar model predictions.
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