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9 results on '"Krauss CB"'

1. Event-by-event direction reconstruction of solar neutrinos in a high light-yield liquid scintillator

Author

Allega, A, Allega, A, Anderson, MR, Andringa, S, Antunes, J, Askins, M, Auty, DJ, Bacon, A, Baker, J, Barros, N, Barão, F, Bayes, R, Beier, EW, Bezerra, TS, Bialek, A, Biller, SD, Blucher, E, Caden, E, Callaghan, EJ, Chen, M, Cheng, S, Cleveland, B, Cookman, D, Corning, J, Cox, MA, Dehghani, R, Deloye, J, Depatie, MM, Di Lodovico, F, Dittmer, J, Dixon, KH, Falk, E, Fatemighomi, N, Ford, R, Gaur, A, González-Reina, OI, Gooding, D, Grant, C, Grove, J, Hall, S, Hallin, AL, Heintzelman, WJ, Helmer, RL, Hewitt, C, Hreljac, B, Howard, V, Hu, J, Hunt-Stokes, R, Hussain, SMA, Inácio, AS, Jillings, CJ, Kaluzienski, S, Kaptanoglu, T, Khaghani, P, Khan, H, Klein, JR, Kormos, LL, Krar, B, Kraus, C, Krauss, CB, Kroupová, T, Lake, C, Lebanowski, L, Lee, J, Lefebvre, C, Lin, YH, Lozza, V, Luo, M, Maio, A, Manecki, S, Maneira, J, Martin, RD, McCauley, N, McDonald, AB, Mills, C, Milton, G, Morton-Blake, I, Mubasher, M, Colina, A Molina, Morris, D, Naugle, S, Nolan, LJ, O’Keeffe, HM, Gann, GD Orebi, Page, J, Paleshi, K, Parker, W, Paton, J, Peeters, SJM, Pickard, L, Ravi, P, Reichold, A, Riccetto, S, Rigan, M, Rose, J, Rosero, R, Rumleskie, J, Semenec, I, Skensved, P, Smiley, M, Smith, J, Allega, A, Allega, A, Anderson, MR, Andringa, S, Antunes, J, Askins, M, Auty, DJ, Bacon, A, Baker, J, Barros, N, Barão, F, Bayes, R, Beier, EW, Bezerra, TS, Bialek, A, Biller, SD, Blucher, E, Caden, E, Callaghan, EJ, Chen, M, Cheng, S, Cleveland, B, Cookman, D, Corning, J, Cox, MA, Dehghani, R, Deloye, J, Depatie, MM, Di Lodovico, F, Dittmer, J, Dixon, KH, Falk, E, Fatemighomi, N, Ford, R, Gaur, A, González-Reina, OI, Gooding, D, Grant, C, Grove, J, Hall, S, Hallin, AL, Heintzelman, WJ, Helmer, RL, Hewitt, C, Hreljac, B, Howard, V, Hu, J, Hunt-Stokes, R, Hussain, SMA, Inácio, AS, Jillings, CJ, Kaluzienski, S, Kaptanoglu, T, Khaghani, P, Khan, H, Klein, JR, Kormos, LL, Krar, B, Kraus, C, Krauss, CB, Kroupová, T, Lake, C, Lebanowski, L, Lee, J, Lefebvre, C, Lin, YH, Lozza, V, Luo, M, Maio, A, Manecki, S, Maneira, J, Martin, RD, McCauley, N, McDonald, AB, Mills, C, Milton, G, Morton-Blake, I, Mubasher, M, Colina, A Molina, Morris, D, Naugle, S, Nolan, LJ, O’Keeffe, HM, Gann, GD Orebi, Page, J, Paleshi, K, Parker, W, Paton, J, Peeters, SJM, Pickard, L, Ravi, P, Reichold, A, Riccetto, S, Rigan, M, Rose, J, Rosero, R, Rumleskie, J, Semenec, I, Skensved, P, Smiley, M, and Smith, J

Abstract

The direction of individual B8 solar neutrinos has been reconstructed using the SNO+ liquid scintillator detector. Prompt, directional Cherenkov light was separated from the slower, isotropic scintillation light using time information, and a maximum likelihood method was used to reconstruct the direction of individual scattered electrons. A clear directional signal was observed, correlated with the solar angle. The observation was aided by a period of low primary fluor concentration that resulted in a slower scintillator decay time. This is the first time that event-by-event direction reconstruction in high light-yield liquid scintillator has been demonstrated in a large-scale detector.

Published
2024

2. Optical calibration of the SNO+ detector in the water phase with deployed sources

Author

Anderson, MR, Anderson, MR, Andringa, S, Askins, M, Auty, DJ, Barão, F, Barros, N, Bayes, R, Beier, EW, Bialek, A, Biller, SD, Blucher, E, Boulay, M, Caden, E, Callaghan, EJ, Caravaca, J, Chen, M, Chkvorets, O, Cleveland, B, Cookman, D, Corning, J, Cox, MA, Deluce, C, Depatie, MM, Di Lodovico, F, Dittmer, J, Falk, E, Fatemighomi, N, Fischer, V, Ford, R, Frankiewicz, K, Gaur, A, Gilje, K, González-Reina, OI, Gooding, D, Grant, C, Grove, J, Hallin, AL, Hallman, D, Hartnell, J, Heintzelman, WJ, Helmer, RL, Hu, J, Hunt-Stokes, R, Hussain, SMA, Inácio, AS, Jillings, CJ, Kaptanoglu, T, Khaghani, P, Khan, H, Klein, JR, Kormos, LL, Krar, B, Kraus, C, Krauss, CB, Kroupová, T, Lam, I, Land, BJ, Latorre, A, Lawson, I, Lebanowski, L, Lefebvre, C, Li, A, Lidgard, J, Lin, YH, Liu, Y, Lozza, V, Luo, M, Maio, A, Manecki, S, Maneira, J, Martin, RD, McCauley, N, McDonald, AB, Meyer, M, Mills, C, Morton-Blake, I, Nae, S, Nirkko, M, Nolan, LJ, O'Keeffe, HM, Orebi Gann, GD, Page, J, Parker, W, Paton, J, Peeters, SJM, Pershing, T, Pickard, L, Prior, G, Ravi, P, Reichold, A, Riccetto, S, Richardson, R, Rigan, M, Rose, J, Rumleskie, J, Semenec, I, Shaker, F, Sharma, MK, Skensved, P, Smiley, M, Anderson, MR, Anderson, MR, Andringa, S, Askins, M, Auty, DJ, Barão, F, Barros, N, Bayes, R, Beier, EW, Bialek, A, Biller, SD, Blucher, E, Boulay, M, Caden, E, Callaghan, EJ, Caravaca, J, Chen, M, Chkvorets, O, Cleveland, B, Cookman, D, Corning, J, Cox, MA, Deluce, C, Depatie, MM, Di Lodovico, F, Dittmer, J, Falk, E, Fatemighomi, N, Fischer, V, Ford, R, Frankiewicz, K, Gaur, A, Gilje, K, González-Reina, OI, Gooding, D, Grant, C, Grove, J, Hallin, AL, Hallman, D, Hartnell, J, Heintzelman, WJ, Helmer, RL, Hu, J, Hunt-Stokes, R, Hussain, SMA, Inácio, AS, Jillings, CJ, Kaptanoglu, T, Khaghani, P, Khan, H, Klein, JR, Kormos, LL, Krar, B, Kraus, C, Krauss, CB, Kroupová, T, Lam, I, Land, BJ, Latorre, A, Lawson, I, Lebanowski, L, Lefebvre, C, Li, A, Lidgard, J, Lin, YH, Liu, Y, Lozza, V, Luo, M, Maio, A, Manecki, S, Maneira, J, Martin, RD, McCauley, N, McDonald, AB, Meyer, M, Mills, C, Morton-Blake, I, Nae, S, Nirkko, M, Nolan, LJ, O'Keeffe, HM, Orebi Gann, GD, Page, J, Parker, W, Paton, J, Peeters, SJM, Pershing, T, Pickard, L, Prior, G, Ravi, P, Reichold, A, Riccetto, S, Richardson, R, Rigan, M, Rose, J, Rumleskie, J, Semenec, I, Shaker, F, Sharma, MK, Skensved, P, and Smiley, M

Abstract

SNO+ is a large-scale liquid scintillator experiment with the primary goal of searching for neutrinoless double beta decay, and is located approximately 2 km underground in SNOLAB, Sudbury, Canada. The detector acquired data for two years as a pure water Cherenkov detector, starting in May 2017. During this period, the optical properties of the detector were measured in situ using a deployed light diffusing sphere, with the goal of improving the detector model and the energy response systematic uncertainties. The measured parameters included the water attenuation coefficients, effective attenuation coefficients for the acrylic vessel, and the angular response of the photomultiplier tubes and their surrounding light concentrators, all across different wavelengths. The calibrated detector model was validated using a deployed tagged gamma source, which showed a 0.6% variation in energy scale across the primary target volume.

Published
2021

3. Search for invisible modes of nucleon decay in water with the SNO+ detector

Author

Anderson, M, Anderson, M, Andringa, S, Arushanova, E, Asahi, S, Askins, M, Auty, DJ, Back, AR, Barnard, Z, Barros, N, Bartlett, D, Barão, F, Bayes, R, Beier, EW, Bialek, A, Biller, SD, Blucher, E, Bonventre, R, Boulay, M, Braid, D, Caden, E, Callaghan, EJ, Caravaca, J, Carvalho, J, Cavalli, L, Chauhan, D, Chen, M, Chkvorets, O, Clark, KJ, Cleveland, B, Connors, C, Coulter, IT, Cressy, D, Dai, X, Darrach, C, Davis-Purcell, B, Depatie, MM, Descamps, F, Di Lodovico, F, Duhaime, N, Duncan, F, Dunger, J, Falk, E, Fatemighomi, N, Fischer, V, Fletcher, E, Ford, R, Gagnon, N, Gilje, K, Gorel, P, Graham, K, Grant, C, Grove, J, Grullon, S, Guillian, E, Hallin, AL, Hallman, D, Hans, S, Hartnell, J, Harvey, P, Hedayatipour, M, Heintzelman, WJ, Heise, J, Helmer, RL, Hernández-Hernández, JL, Hreljac, B, Hu, J, Iida, T, Inácio, AS, Jackson, CM, Jelley, NA, Jillings, CJ, Jones, C, Jones, PG, Kamdin, K, Kaptanoglu, T, Kaspar, J, Keeter, K, Kefelian, C, Khaghani, P, Kippenbrock, L, Klein, JR, Knapik, R, Kofron, J, Kormos, LL, Krar, B, Kraus, C, Krauss, CB, Kroupova, T, Labe, K, Lam, I, Lan, C, Land, BJ, Lane, R, Langrock, S, Latorre, A, Lawson, I, Lebanowski, L, Lefeuvre, GM, Leming, EJ, Li, A, Anderson, M, Anderson, M, Andringa, S, Arushanova, E, Asahi, S, Askins, M, Auty, DJ, Back, AR, Barnard, Z, Barros, N, Bartlett, D, Barão, F, Bayes, R, Beier, EW, Bialek, A, Biller, SD, Blucher, E, Bonventre, R, Boulay, M, Braid, D, Caden, E, Callaghan, EJ, Caravaca, J, Carvalho, J, Cavalli, L, Chauhan, D, Chen, M, Chkvorets, O, Clark, KJ, Cleveland, B, Connors, C, Coulter, IT, Cressy, D, Dai, X, Darrach, C, Davis-Purcell, B, Depatie, MM, Descamps, F, Di Lodovico, F, Duhaime, N, Duncan, F, Dunger, J, Falk, E, Fatemighomi, N, Fischer, V, Fletcher, E, Ford, R, Gagnon, N, Gilje, K, Gorel, P, Graham, K, Grant, C, Grove, J, Grullon, S, Guillian, E, Hallin, AL, Hallman, D, Hans, S, Hartnell, J, Harvey, P, Hedayatipour, M, Heintzelman, WJ, Heise, J, Helmer, RL, Hernández-Hernández, JL, Hreljac, B, Hu, J, Iida, T, Inácio, AS, Jackson, CM, Jelley, NA, Jillings, CJ, Jones, C, Jones, PG, Kamdin, K, Kaptanoglu, T, Kaspar, J, Keeter, K, Kefelian, C, Khaghani, P, Kippenbrock, L, Klein, JR, Knapik, R, Kofron, J, Kormos, LL, Krar, B, Kraus, C, Krauss, CB, Kroupova, T, Labe, K, Lam, I, Lan, C, Land, BJ, Lane, R, Langrock, S, Latorre, A, Lawson, I, Lebanowski, L, Lefeuvre, GM, Leming, EJ, and Li, A

Abstract

This paper reports results from a search for nucleon decay through invisible modes, where no visible energy is directly deposited during the decay itself, during the initial water phase of SNO+. However, such decays within the oxygen nucleus would produce an excited daughter that would subsequently deexcite, often emitting detectable gamma rays. A search for such gamma rays yields limits of 2.5×1029 y at 90% Bayesian credibility level (with a prior uniform in rate) for the partial lifetime of the neutron, and 3.6×1029 y for the partial lifetime of the proton, the latter a 70% improvement on the previous limit from SNO. We also present partial lifetime limits for invisible dinucleon modes of 1.3×1028 y for nn, 2.6×1028 y for pn and 4.7×1028 y for pp, an improvement over existing limits by close to 3 orders of magnitude for the latter two.

Published
2019

4. Measurement of the B 8 solar neutrino flux in SNO+ with very low backgrounds

Author

Anderson, M, Anderson, M, Andringa, S, Asahi, S, Askins, M, Auty, DJ, Barros, N, Bartlett, D, Barão, F, Bayes, R, Beier, EW, Bialek, A, Biller, SD, Blucher, E, Bonventre, R, Boulay, M, Caden, E, Callaghan, EJ, Caravaca, J, Chauhan, D, Chen, M, Chkvorets, O, Cleveland, B, Connors, C, Coulter, IT, Depatie, MM, Di Lodovico, F, Duncan, F, Dunger, J, Falk, E, Fischer, V, Fletcher, E, Ford, R, Gagnon, N, Gilje, K, Grant, C, Grove, J, Hallin, AL, Hallman, D, Hans, S, Hartnell, J, Heintzelman, WJ, Helmer, RL, Hernández-Hernández, JL, Hreljac, B, Hu, J, Inácio, AS, Jillings, CJ, Kaptanoglu, T, Khaghani, P, Klein, JR, Knapik, R, Kormos, LL, Krar, B, Kraus, C, Krauss, CB, Kroupova, T, Lam, I, Land, BJ, Lane, R, Latorre, A, Lawson, I, Lebanowski, L, Leming, EJ, Li, A, Lidgard, J, Liggins, B, Liu, Y, Lozza, V, Luo, M, Maguire, S, Maio, A, Manecki, S, Maneira, J, Martin, RD, Marzec, E, Mastbaum, A, McCauley, N, McDonald, AB, Mekarski, P, Meyer, M, Mlejnek, M, Morton-Blake, I, Nae, S, Nirkko, M, O'Keeffe, HM, Orebi Gann, GD, Parnell, MJ, Paton, J, Peeters, SJM, Pershing, T, Pickard, L, Pracsovics, D, Prior, G, Reichold, A, Richardson, R, Rigan, M, Rose, J, Rosero, R, Rumleskie, J, Semenec, I, Anderson, M, Anderson, M, Andringa, S, Asahi, S, Askins, M, Auty, DJ, Barros, N, Bartlett, D, Barão, F, Bayes, R, Beier, EW, Bialek, A, Biller, SD, Blucher, E, Bonventre, R, Boulay, M, Caden, E, Callaghan, EJ, Caravaca, J, Chauhan, D, Chen, M, Chkvorets, O, Cleveland, B, Connors, C, Coulter, IT, Depatie, MM, Di Lodovico, F, Duncan, F, Dunger, J, Falk, E, Fischer, V, Fletcher, E, Ford, R, Gagnon, N, Gilje, K, Grant, C, Grove, J, Hallin, AL, Hallman, D, Hans, S, Hartnell, J, Heintzelman, WJ, Helmer, RL, Hernández-Hernández, JL, Hreljac, B, Hu, J, Inácio, AS, Jillings, CJ, Kaptanoglu, T, Khaghani, P, Klein, JR, Knapik, R, Kormos, LL, Krar, B, Kraus, C, Krauss, CB, Kroupova, T, Lam, I, Land, BJ, Lane, R, Latorre, A, Lawson, I, Lebanowski, L, Leming, EJ, Li, A, Lidgard, J, Liggins, B, Liu, Y, Lozza, V, Luo, M, Maguire, S, Maio, A, Manecki, S, Maneira, J, Martin, RD, Marzec, E, Mastbaum, A, McCauley, N, McDonald, AB, Mekarski, P, Meyer, M, Mlejnek, M, Morton-Blake, I, Nae, S, Nirkko, M, O'Keeffe, HM, Orebi Gann, GD, Parnell, MJ, Paton, J, Peeters, SJM, Pershing, T, Pickard, L, Pracsovics, D, Prior, G, Reichold, A, Richardson, R, Rigan, M, Rose, J, Rosero, R, Rumleskie, J, and Semenec, I

Abstract

A measurement of the B8 solar neutrino flux has been made using a 69.2 kt-day dataset acquired with the SNO+ detector during its water commissioning phase. At energies above 6 MeV the dataset is an extremely pure sample of solar neutrino elastic scattering events, owing primarily to the detector's deep location, allowing an accurate measurement with relatively little exposure. In that energy region the best fit background rate is 0.25-0.07+0.09 events/kt-day, significantly lower than the measured solar neutrino event rate in that energy range, which is 1.03-0.12+0.13 events/kt-day. Also using data below this threshold, down to 5 MeV, fits of the solar neutrino event direction yielded an observed flux of 2.53-0.28+0.31(stat)-0.10+0.13(syst)×106 cm-2 s-1, assuming no neutrino oscillations. This rate is consistent with matter enhanced neutrino oscillations and measurements from other experiments.

Published
2019

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

Author

Aharmim, B, 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, Aharmim, B, 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, and Rielage, K

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.

Published
2019

6. Measurement of the B 8 solar neutrino flux in SNO+ with very low backgrounds

Author

Anderson, M, Anderson, M, Andringa, S, Asahi, S, Askins, M, Auty, DJ, Barros, N, Bartlett, D, Barão, F, Bayes, R, Beier, EW, Bialek, A, Biller, SD, Blucher, E, Bonventre, R, Boulay, M, Caden, E, Callaghan, EJ, Caravaca, J, Chauhan, D, Chen, M, Chkvorets, O, Cleveland, B, Connors, C, Coulter, IT, Depatie, MM, Di Lodovico, F, Duncan, F, Dunger, J, Falk, E, Fischer, V, Fletcher, E, Ford, R, Gagnon, N, Gilje, K, Grant, C, Grove, J, Hallin, AL, Hallman, D, Hans, S, Hartnell, J, Heintzelman, WJ, Helmer, RL, Hernández-Hernández, JL, Hreljac, B, Hu, J, Inácio, AS, Jillings, CJ, Kaptanoglu, T, Khaghani, P, Klein, JR, Knapik, R, Kormos, LL, Krar, B, Kraus, C, Krauss, CB, Kroupova, T, Lam, I, Land, BJ, Lane, R, Latorre, A, Lawson, I, Lebanowski, L, Leming, EJ, Li, A, Lidgard, J, Liggins, B, Liu, Y, Lozza, V, Luo, M, Maguire, S, Maio, A, Manecki, S, Maneira, J, Martin, RD, Marzec, E, Mastbaum, A, McCauley, N, McDonald, AB, Mekarski, P, Meyer, M, Mlejnek, M, Morton-Blake, I, Nae, S, Nirkko, M, O'Keeffe, HM, Orebi Gann, GD, Parnell, MJ, Paton, J, Peeters, SJM, Pershing, T, Pickard, L, Pracsovics, D, Prior, G, Reichold, A, Richardson, R, Rigan, M, Rose, J, Rosero, R, Rumleskie, J, Semenec, I, Anderson, M, Anderson, M, Andringa, S, Asahi, S, Askins, M, Auty, DJ, Barros, N, Bartlett, D, Barão, F, Bayes, R, Beier, EW, Bialek, A, Biller, SD, Blucher, E, Bonventre, R, Boulay, M, Caden, E, Callaghan, EJ, Caravaca, J, Chauhan, D, Chen, M, Chkvorets, O, Cleveland, B, Connors, C, Coulter, IT, Depatie, MM, Di Lodovico, F, Duncan, F, Dunger, J, Falk, E, Fischer, V, Fletcher, E, Ford, R, Gagnon, N, Gilje, K, Grant, C, Grove, J, Hallin, AL, Hallman, D, Hans, S, Hartnell, J, Heintzelman, WJ, Helmer, RL, Hernández-Hernández, JL, Hreljac, B, Hu, J, Inácio, AS, Jillings, CJ, Kaptanoglu, T, Khaghani, P, Klein, JR, Knapik, R, Kormos, LL, Krar, B, Kraus, C, Krauss, CB, Kroupova, T, Lam, I, Land, BJ, Lane, R, Latorre, A, Lawson, I, Lebanowski, L, Leming, EJ, Li, A, Lidgard, J, Liggins, B, Liu, Y, Lozza, V, Luo, M, Maguire, S, Maio, A, Manecki, S, Maneira, J, Martin, RD, Marzec, E, Mastbaum, A, McCauley, N, McDonald, AB, Mekarski, P, Meyer, M, Mlejnek, M, Morton-Blake, I, Nae, S, Nirkko, M, O'Keeffe, HM, Orebi Gann, GD, Parnell, MJ, Paton, J, Peeters, SJM, Pershing, T, Pickard, L, Pracsovics, D, Prior, G, Reichold, A, Richardson, R, Rigan, M, Rose, J, Rosero, R, Rumleskie, J, and Semenec, I

Abstract

A measurement of the B8 solar neutrino flux has been made using a 69.2 kt-day dataset acquired with the SNO+ detector during its water commissioning phase. At energies above 6 MeV the dataset is an extremely pure sample of solar neutrino elastic scattering events, owing primarily to the detector's deep location, allowing an accurate measurement with relatively little exposure. In that energy region the best fit background rate is 0.25-0.07+0.09 events/kt-day, significantly lower than the measured solar neutrino event rate in that energy range, which is 1.03-0.12+0.13 events/kt-day. Also using data below this threshold, down to 5 MeV, fits of the solar neutrino event direction yielded an observed flux of 2.53-0.28+0.31(stat)-0.10+0.13(syst)×106 cm-2 s-1, assuming no neutrino oscillations. This rate is consistent with matter enhanced neutrino oscillations and measurements from other experiments.

Published
2019

7. Search for invisible modes of nucleon decay in water with the SNO+ detector

Author

Anderson, M, Anderson, M, Andringa, S, Arushanova, E, Asahi, S, Askins, M, Auty, DJ, Back, AR, Barnard, Z, Barros, N, Bartlett, D, Barão, F, Bayes, R, Beier, EW, Bialek, A, Biller, SD, Blucher, E, Bonventre, R, Boulay, M, Braid, D, Caden, E, Callaghan, EJ, Caravaca, J, Carvalho, J, Cavalli, L, Chauhan, D, Chen, M, Chkvorets, O, Clark, KJ, Cleveland, B, Connors, C, Coulter, IT, Cressy, D, Dai, X, Darrach, C, Davis-Purcell, B, Depatie, MM, Descamps, F, Di Lodovico, F, Duhaime, N, Duncan, F, Dunger, J, Falk, E, Fatemighomi, N, Fischer, V, Fletcher, E, Ford, R, Gagnon, N, Gilje, K, Gorel, P, Graham, K, Grant, C, Grove, J, Grullon, S, Guillian, E, Hallin, AL, Hallman, D, Hans, S, Hartnell, J, Harvey, P, Hedayatipour, M, Heintzelman, WJ, Heise, J, Helmer, RL, Hernández-Hernández, JL, Hreljac, B, Hu, J, Iida, T, Inácio, AS, Jackson, CM, Jelley, NA, Jillings, CJ, Jones, C, Jones, PG, Kamdin, K, Kaptanoglu, T, Kaspar, J, Keeter, K, Kefelian, C, Khaghani, P, Kippenbrock, L, Klein, JR, Knapik, R, Kofron, J, Kormos, LL, Krar, B, Kraus, C, Krauss, CB, Kroupova, T, Labe, K, Lam, I, Lan, C, Land, BJ, Lane, R, Langrock, S, Latorre, A, Lawson, I, Lebanowski, L, Lefeuvre, GM, Leming, EJ, Li, A, Anderson, M, Anderson, M, Andringa, S, Arushanova, E, Asahi, S, Askins, M, Auty, DJ, Back, AR, Barnard, Z, Barros, N, Bartlett, D, Barão, F, Bayes, R, Beier, EW, Bialek, A, Biller, SD, Blucher, E, Bonventre, R, Boulay, M, Braid, D, Caden, E, Callaghan, EJ, Caravaca, J, Carvalho, J, Cavalli, L, Chauhan, D, Chen, M, Chkvorets, O, Clark, KJ, Cleveland, B, Connors, C, Coulter, IT, Cressy, D, Dai, X, Darrach, C, Davis-Purcell, B, Depatie, MM, Descamps, F, Di Lodovico, F, Duhaime, N, Duncan, F, Dunger, J, Falk, E, Fatemighomi, N, Fischer, V, Fletcher, E, Ford, R, Gagnon, N, Gilje, K, Gorel, P, Graham, K, Grant, C, Grove, J, Grullon, S, Guillian, E, Hallin, AL, Hallman, D, Hans, S, Hartnell, J, Harvey, P, Hedayatipour, M, Heintzelman, WJ, Heise, J, Helmer, RL, Hernández-Hernández, JL, Hreljac, B, Hu, J, Iida, T, Inácio, AS, Jackson, CM, Jelley, NA, Jillings, CJ, Jones, C, Jones, PG, Kamdin, K, Kaptanoglu, T, Kaspar, J, Keeter, K, Kefelian, C, Khaghani, P, Kippenbrock, L, Klein, JR, Knapik, R, Kofron, J, Kormos, LL, Krar, B, Kraus, C, Krauss, CB, Kroupova, T, Labe, K, Lam, I, Lan, C, Land, BJ, Lane, R, Langrock, S, Latorre, A, Lawson, I, Lebanowski, L, Lefeuvre, GM, Leming, EJ, and Li, A

Abstract

This paper reports results from a search for nucleon decay through invisible modes, where no visible energy is directly deposited during the decay itself, during the initial water phase of SNO+. However, such decays within the oxygen nucleus would produce an excited daughter that would subsequently deexcite, often emitting detectable gamma rays. A search for such gamma rays yields limits of 2.5×1029 y at 90% Bayesian credibility level (with a prior uniform in rate) for the partial lifetime of the neutron, and 3.6×1029 y for the partial lifetime of the proton, the latter a 70% improvement on the previous limit from SNO. We also present partial lifetime limits for invisible dinucleon modes of 1.3×1028 y for nn, 2.6×1028 y for pn and 4.7×1028 y for pp, an improvement over existing limits by close to 3 orders of magnitude for the latter two.

Published
2019

8. Tests of Lorentz invariance at the Sudbury Neutrino Observatory

Author

Aharmim, B, Aharmim, B, Ahmed, SN, Anthony, AE, Barros, N, Beier, EW, Bellerive, A, Beltran, B, Bergevin, M, Biller, SD, Blucher, E, 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, PL, Dunford, M, Elliott, SR, Evans, HC, Ewan, GT, Farine, J, Fergani, H, Fleurot, F, Ford, RJ, Formaggio, JA, Gagnon, N, Gilje, K, Goon, JT, 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, Kéfélian, C, Keeter, KJ, Klein, JR, Kormos, LL, Kos, M, Krüger, A, Kraus, C, Krauss, CB, Kutter, T, Kyba, CCM, Labe, K, Land, BJ, Lange, R, Latorre, A, 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, Orebi Gann, GD, Oser, SM, Ott, RA, Peeters, SJM, Aharmim, B, Aharmim, B, Ahmed, SN, Anthony, AE, Barros, N, Beier, EW, Bellerive, A, Beltran, B, Bergevin, M, Biller, SD, Blucher, E, 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, PL, Dunford, M, Elliott, SR, Evans, HC, Ewan, GT, Farine, J, Fergani, H, Fleurot, F, Ford, RJ, Formaggio, JA, Gagnon, N, Gilje, K, Goon, JT, 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, Kéfélian, C, Keeter, KJ, Klein, JR, Kormos, LL, Kos, M, Krüger, A, Kraus, C, Krauss, CB, Kutter, T, Kyba, CCM, Labe, K, Land, BJ, Lange, R, Latorre, A, 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, Orebi Gann, GD, Oser, SM, Ott, RA, and Peeters, SJM

Abstract

Experimental tests of Lorentz symmetry in systems of all types are critical for ensuring that the basic assumptions of physics are well founded. Data from all phases of the Sudbury Neutrino Observatory, a kiloton-scale heavy water Cherenkov detector, are analyzed for possible violations of Lorentz symmetry in the neutrino sector. Such violations would appear as one of eight possible signal types in the detector: six seasonal variations in the solar electron neutrino survival probability differing in energy and time dependence and two shape changes to the oscillated solar neutrino energy spectrum. No evidence for such signals is observed, and limits on the size of such effects are established in the framework of the standard model extension, including 38 limits on previously unconstrained operators and improved limits on 16 additional operators. This makes limits on all minimal, Dirac-type Lorentz violating operators in the neutrino sector available for the first time.

Published
2018

9. Tests of Lorentz invariance at the Sudbury Neutrino Observatory

Author

Aharmim, B, Aharmim, B, Ahmed, SN, Anthony, AE, Barros, N, Beier, EW, Bellerive, A, Beltran, B, Bergevin, M, Biller, SD, Blucher, E, 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, PL, Dunford, M, Elliott, SR, Evans, HC, Ewan, GT, Farine, J, Fergani, H, Fleurot, F, Ford, RJ, Formaggio, JA, Gagnon, N, Gilje, K, Goon, JT, 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, Kéfélian, C, Keeter, KJ, Klein, JR, Kormos, LL, Kos, M, Krüger, A, Kraus, C, Krauss, CB, Kutter, T, Kyba, CCM, Labe, K, Land, BJ, Lange, R, Latorre, A, 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, Orebi Gann, GD, Oser, SM, Ott, RA, Peeters, SJM, Aharmim, B, Aharmim, B, Ahmed, SN, Anthony, AE, Barros, N, Beier, EW, Bellerive, A, Beltran, B, Bergevin, M, Biller, SD, Blucher, E, 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, PL, Dunford, M, Elliott, SR, Evans, HC, Ewan, GT, Farine, J, Fergani, H, Fleurot, F, Ford, RJ, Formaggio, JA, Gagnon, N, Gilje, K, Goon, JT, 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, Kéfélian, C, Keeter, KJ, Klein, JR, Kormos, LL, Kos, M, Krüger, A, Kraus, C, Krauss, CB, Kutter, T, Kyba, CCM, Labe, K, Land, BJ, Lange, R, Latorre, A, 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, Orebi Gann, GD, Oser, SM, Ott, RA, and Peeters, SJM

Abstract

Experimental tests of Lorentz symmetry in systems of all types are critical for ensuring that the basic assumptions of physics are well founded. Data from all phases of the Sudbury Neutrino Observatory, a kiloton-scale heavy water Cherenkov detector, are analyzed for possible violations of Lorentz symmetry in the neutrino sector. Such violations would appear as one of eight possible signal types in the detector: six seasonal variations in the solar electron neutrino survival probability differing in energy and time dependence and two shape changes to the oscillated solar neutrino energy spectrum. No evidence for such signals is observed, and limits on the size of such effects are established in the framework of the standard model extension, including 38 limits on previously unconstrained operators and improved limits on 16 additional operators. This makes limits on all minimal, Dirac-type Lorentz violating operators in the neutrino sector available for the first time.

Published
2018

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