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arXiv · 2007.08018

Search for $hep$ solar neutrinos and the diffuse supernova neutrino background using all three phases of the Sudbury Neutrino Observatory

B. Aharmim·S. N. Ahmed·A. E. Anthony·N. Barros·E. W. Beier·A. Bellerive·B. Beltran·M. Bergevin·S. D. Biller·E. Blucher·R. Bonventre·K. Boudjemline·M. G. Boulay·B. Cai·E. J. Callaghan·J. Caravaca·Y. D. Chan·D. Chauhan·M. Chen·B. T. Cleveland·G. A. Cox·X. Dai·H. Deng·F. B. Descamps·J. A. Detwiler·P. J. Doe·G. Doucas·P. -L. Drouin·M. Dunford·S. R. Elliott·H. C. Evans·G. T. Ewan·J. Farine·H. Fergani·F. Fleurot·R. J. Ford·J. A. Formaggio·N. Gagnon·K. Gilje·J. TM. Goon·K. Graham·E. Guillian·S. Habib·R. L. Hahn·A. L. Hallin·E. D. Hallman·P. J. Harvey·R. Hazama·W. J. Heintzelman·J. Heise·R. L. Helmer·A. Hime·C. Howard·M. Huang·P. Jagam·B. Jamieson·N. A. Jelley·M. Jerkins·K. J. Keeter·J. R. Klein·L. L. Kormos·M. Kos·C. Kraus·C. B. Krauss·A. Krüger·T. Kutter·C. C. M. Kyba·K. Labe·B. J. Land·R. Lange·A. LaTorre·J. Law·I. T. Lawson·K. T. Lesko·J. R. Leslie·I. Levine·J. C. Loach·R. MacLellan·S. Majerus·H. B. Mak·J. Maneira·R. D. Martin·A. Mastbaum·N. McCauley·A. B. McDonald·S. R. McGee·M. L. Miller·B. Monreal·J. Monroe·B. G. Nickel·A. J. Noble·H. M. O'Keeffe·N. S. Oblath·C. E. Okada·R. W. Ollerhead·G. D. Orebi Gann·S. M. Oser·R. A. Ott·S. J. M. Peeters·A. W. P. Poon
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Abstract

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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B. Aharmim, S. N. Ahmed, A. E. Anthony, N. Barros, E. W. Beier, A. Bellerive, B. Beltran, M. Bergevin, S. D. Biller, E. Blucher, R. Bonventre, K. Boudjemline, M. G. Boulay, B. Cai, E. J. Callaghan, J. Caravaca, Y. D. Chan, D. Chauhan, M. Chen, B. T. Cleveland, G. A. Cox, X. Dai, H. Deng, F. B. Descamps, J. A. Detwiler, P. J. Doe, G. Doucas, P. -L. Drouin, M. Dunford, S. R. Elliott, H. C. Evans, G. T. Ewan, J. Farine, H. Fergani, F. Fleurot, R. J. Ford, J. A. Formaggio, N. Gagnon, K. Gilje, J. TM. Goon, K. Graham, E. Guillian, S. Habib, R. L. Hahn, A. L. Hallin, E. D. Hallman, P. J. Harvey, R. Hazama, W. J. Heintzelman, J. Heise, R. L. Helmer, A. Hime, C. Howard, M. Huang, P. Jagam, B. Jamieson, N. A. Jelley, M. Jerkins, K. J. Keeter, J. R. Klein, L. L. Kormos, M. Kos, C. Kraus, C. B. Krauss, A. Krüger, T. Kutter, C. C. M. Kyba, K. Labe, B. J. Land, R. Lange, A. LaTorre, J. Law, I. T. Lawson, K. T. Lesko, J. R. Leslie, I. Levine, J. C. Loach, R. MacLellan, S. Majerus, H. B. Mak, J. Maneira, R. D. Martin, A. Mastbaum, N. McCauley, A. B. McDonald, S. R. McGee, M. L. Miller, B. Monreal, J. Monroe, B. G. Nickel, A. J. Noble, H. M. O'Keeffe, N. S. Oblath, C. E. Okada, R. W. Ollerhead, G. D. Orebi Gann, S. M. Oser, R. A. Ott, S. J. M. Peeters, A. W. P. Poon. 2020-07-15. Search for $hep$ solar neutrinos and the diffuse supernova neutrino background using all three phases of the Sudbury Neutrino Observatory. https://doi.org/10.1103/physrevd.102.062006

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