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

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arxiv 2007.08018 v2 pith:QYEI5QA6 submitted 2020-07-15 hep-ex nucl-ex

B. Aharmim , S. N. Ahmed , A. E. Anthony , N. Barros , E. W. Beier , A. Bellerive , B. Beltran , M. Bergevin
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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 G. Prior S. D. Reitzner K. Rielage B. C. Robertson R. G. H. Robertson M. H. Schwendener J. A. Secrest S. R. Seibert O. Simard D. Sinclair P. Skensved T. J. Sonley L. C. Stonehill G. Tešić N. Tolich T. Tsui R. Van Berg B. A. VanDevender C. J. Virtue B. L. Wall D. Waller H. Wan Chan Tseung D. L. Wark J. Wendland N. West J. F. Wilkerson J. R. Wilson T. Winchester A. Wright M. Yeh F. Zhang K. Zuber
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classification hep-exnucl-ex
keywords dsnbneutrinosearchfluxmathrmsolarbackgroundcomponent
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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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Cited by 2 Pith papers

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  1. Opportunities and challenges to study solar neutrinos with a Q-Pix pixel readout

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    Simulations show a Q-Pix liquid argon detector could, in a low-background underground scenario, see boron-8 and hep solar neutrinos above about 5 MeV if poorly understood gamma and alpha-capture backgrounds are controlled.

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    hep-ph 2024-12 conditional novelty 6.0 of 10

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