Measurement of neutron production in atmospheric neutrino interactions at the Sudbury Neutrino Observatory
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Measurement of neutron production in atmospheric neutrino interactions at the Sudbury Neutrino Observatory

  • Author(s): Aharmim, B
  • Ahmed, SN
  • Anthony, AE
  • Barros, N
  • Beier, EW
  • Bellerive, A
  • Beltran, B
  • Bergevin, M
  • Biller, SD
  • Bonventre, R
  • Boudjemline, K
  • Boulay, MG
  • Cai, B
  • Callaghan, EJ
  • Caravaca, J
  • Chan, YD
  • Chauhan, D
  • Chen, M
  • Cleveland, BT
  • Cox, GA
  • Dai, X
  • Deng, H
  • Descamps, FB
  • Detwiler, JA
  • Doe, PJ
  • Doucas, G
  • Drouin, P-L
  • Dunford, M
  • Elliott, SR
  • Evans, HC
  • Ewan, GT
  • Farine, J
  • Fergani, H
  • Fleurot, F
  • Ford, RJ
  • Formaggio, JA
  • Gagnon, N
  • Gilje, K
  • Goon, JTM
  • Graham, K
  • Guillian, E
  • Habib, S
  • Hahn, RL
  • Hallin, AL
  • Hallman, ED
  • Harvey, PJ
  • Hazama, R
  • Heintzelman, WJ
  • Heise, J
  • Helmer, RL
  • Hime, A
  • Howard, C
  • Huang, M
  • Jagam, P
  • Jamieson, B
  • Jelley, NA
  • Jerkins, M
  • Keeter, KJ
  • Klein, JR
  • Kormos, LL
  • Kos, M
  • Kruger, A
  • Kraus, C
  • Krauss, CB
  • Kutter, T
  • Kyba, CCM
  • Land, BJ
  • Lange, R
  • Law, J
  • Lawson, IT
  • Lesko, KT
  • Leslie, JR
  • Levine, I
  • Loach, JC
  • MacLellan, R
  • Majerus, S
  • Mak, HB
  • Maneira, J
  • Martin, RD
  • Mastbaum, A
  • McCauley, N
  • McDonald, AB
  • McGee, SR
  • Miller, ML
  • Monreal, B
  • Monroe, J
  • Nickel, BG
  • Noble, AJ
  • O'Keeffe, HM
  • Oblath, NS
  • Okada, CE
  • Ollerhead, RW
  • Gann, GD Orebi
  • Oser, SM
  • Ott, RA
  • Peeters, SJM
  • Poon, AWP
  • Prior, G
  • Reitzner, SD
  • Rielage, K
  • Robertson, BC
  • Robertson, RGH
  • Schwendener, MH
  • Secrest, JA
  • Seibert, SR
  • Simard, O
  • Sinclair, D
  • Singh, J
  • Skensved, P
  • Smiley, M
  • Sonley, TJ
  • Stonehill, LC
  • Tesic, G
  • Tolich, N
  • Tsui, T
  • Van Berg, R
  • VanDevender, BA
  • Virtue, CJ
  • Wall, BL
  • Waller, D
  • Tseung, H Wan Chan
  • Wark, DL
  • Wendland, J
  • West, N
  • Wilkerson, JF
  • Wilson, JR
  • Winchester, T
  • Wright, A
  • Yeh, M
  • Zhang, F
  • Zuber, K
  • Collaboration, SNO
  • et al.
Abstract

Neutron production in GeV-scale neutrino interactions is a poorly studied process. We have measured the neutron multiplicities in atmospheric neutrino interactions in the Sudbury Neutrino Observatory experiment and compared them to the prediction of a Monte Carlo simulation using GENIE and a minimally modified version of GEANT4. We analyzed 837 days of exposure corresponding to Phase I, using pure heavy water, and Phase II, using a mixture of Cl in heavy water. Neutrons produced in atmospheric neutrino interactions were identified with an efficiency of $15.3\%$ and $44.3\%$, for Phase I and II respectively. The neutron production is measured as a function of the visible energy of the neutrino interaction and, for charged current quasi-elastic interaction candidates, also as a function of the neutrino energy. This study is also performed classifying the complete sample into two pairs of event categories: charged current quasi-elastic and non charged current quasi-elastic, and $\nu_{\mu}$ and $\nu_e$. Results show good overall agreement between data and Monte Carlo for both phases, with some small tension with a statistical significance below $2\sigma$ for some intermediate energies.

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