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  • Search for $hep$ solar neutrinos and the diffuse supernova neutrino background using all three phases of the Sudbury Neutrino Observatory
    Aharmim, B; Ahmed, S. N; Barros, N; Beier, E. W; Bellerive, A; Beltran, B; Bergevin, M; Biller, S. D; Bonventre, R; Boulay, M. G; Caravaca, J; Chan, Y. D; Chauhan, D; Chen, M; Cleveland, B. T; Cox, G. A; Dai, X; Deng, H; Detwiler, J. A; Doe, P. J; Doucas, G; Drouin, P. -L; Dunford, M; Elliott, S. R; Evans, H. C; Farine, J; Formaggio, J. A; Goon, J. TM; Graham, K; Guillian, E; Habib, S; Hahn, R. L; Hallin, A. L; Hallman, E. D; Harvey, P. J; Hazama, R; Heintzelman, W. J; Heise, J; Helmer, R. L; Huang, M; Jagam, P; Jamieson, B; Jelley, N. A; Jerkins, M; Keeter, K. J; Kormos, L. L; Kos, M; Kraus, C; Krauss, C. B; Krüger, A; Kutter, T; Kyba, C. C. M; Land, B. J; Lange, R; LaTorre, A; Lawson, I. T; Lesko, K. T; Leslie, J. R; Levine, I; Loach, J. C; Majerus, S; Mak, H. B; Maneira, J; Martin, R. D; Mastbaum, A; McCauley, N; McDonald, A. B; McGee, S. R; Miller, M. L; Monroe, J; Nickel, B. G; O'Keeffe, H. M; Oblath, N. S; Ollerhead, R. W; Gann, G. D. Orebi; Oser, S. M; Ott, R. A; Poon, A. W. P; Reitzner, S. D; Rielage, K; Robertson, B. C; Robertson, R. G. H; Schwendener, M. H; Secrest, J. A; Simard, O; Skensved, P; Tešić, G; Tolich, N; Tsui, T; Van Berg, R; VanDevender, B. A; Virtue, C. J; Waller, D; Tseung, H. Wan Chan; Wark, D. L; Wendland, J; Wilkerson, J. F; Wright, A; Yeh, M; Zhang, F

    07/2020
    Journal Article

    Phys. Rev. D 102, 062006 (2020) A search has been performed for neutrinos from two sources, the $hep$ reaction in the solar $pp$ fusion chain and the $\nu_e$ component of the diffuse supernova neutrino background (DSNB), using the full dataset of the Sudbury Neutrino Observatory with a total exposure of 2.47 kton-years after fiducialization. The $hep$ search is performed using both a single-bin counting analysis and a likelihood fit. We find a best-fit flux that is compatible with solar model predictions while remaining consistent with zero flux, and set a one-sided upper limit of $\Phi_{hep} < 30\times10^{3}~\mathrm{cm}^{-2}~\mathrm{s}^{-1}$ 90% credible interval (CI). No events are observed in the DSNB search region, and we set an improved upper bound on the $\nu_e$ component of the DSNB flux of $\Phi^\mathrm{DSNB}_{\nu_e} < 19~\textrm{cm}^{-2}~\textrm{s}^{-1}$ (90% CI) in the energy range $22.9 < E_\nu < 36.9$~MeV.

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