학술논문
Measurement of neutron production in atmospheric neutrino interactions at the Sudbury Neutrino Observatory
Document Type
Working Paper
Author
SNO Collaboration; Aharmim, B.; Ahmed, S. N.; Anthony, A. E.; Barros, N.; Beier, E. W.; Bellerive, A.; Beltran, B.; Bergevin, M.; Biller, S. D.; Bonventre, R.; Boudjemline, K.; Boulay, M. G.; Cai, B.; Callaghan, E. J.; Caravaca, J.; Chan, Y. D.; Chauhan, D.; Chen, M.; Cleveland, B. T.; Cox, G. A.; Dai, X.; Deng, H.; Descamps, F. B.; Detwiler, J. A.; Doe, P. J.; Doucas, G.; Drouin, P. -L.; Dunford, M.; Elliott, S. R.; Evans, H. C.; Ewan, G. T.; Farine, J.; Fergani, H.; Fleurot, F.; Ford, R. J.; Formaggio, J. A.; Gagnon, N.; Gilje, K.; 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.; Hime, A.; Howard, C.; Huang, M.; Jagam, P.; Jamieson, B.; Jelley, N. A.; Jerkins, M.; Keeter, K. J.; Klein, J. R.; Kormos, L. L.; Kos, M.; Kruger, A.; Kraus, C.; Krauss, C. B.; Kutter, T.; Kyba, C. C. M.; Land, B. J.; Lange, R.; Law, J.; Lawson, I. T.; Lesko, K. T.; Leslie, J. R.; Levine, I.; Loach, J. C.; MacLellan, R.; Majerus, S.; Mak, H. B.; Maneira, J.; Martin, R. D.; Mastbaum, A.; McCauley, N.; McDonald, A. B.; McGee, S. R.; Miller, M. L.; Monreal, B.; Monroe, J.; Nickel, B. G.; Noble, A. J.; O'Keeffe, H. M.; Oblath, N. S.; Okada, C. E.; Ollerhead, R. W.; Gann, G. D. Orebi; Oser, S. M.; Ott, R. A.; Peeters, S. J. M.; Poon, A. W. P.; Prior, G.; Reitzner, S. D.; Rielage, K.; Robertson, B. C.; Robertson, R. G. H.; Schwendener, M. H.; Secrest, J. A.; Seibert, S. R.; Simard, O.; Sinclair, D.; Singh, J.; Skensved, P.; Smiley, M.; Sonley, T. J.; Stonehill, L. C.; Tesic, G.; Tolich, N.; Tsui, T.; Van Berg, R.; VanDevender, B. A.; Virtue, C. J.; Wall, B. L.; Waller, D.; Tseung, H. Wan Chan; Wark, D. L.; Wendland, J.; West, N.; Wilkerson, J. F.; Wilson, J. R.; Winchester, T.; Wright, A.; Yeh, M.; Zhang, F.; Zuber, K.
Source
Phys. Rev. D 99, 112007 (2019)
Subject
Language
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.