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25 results on '"Krauss CB"'

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

Author

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

Subjects
Nuclear and Plasma Physics, Physical Sciences
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. Evidence of Antineutrinos from Distant Reactors Using Pure Water at SNO+

Author

Allega, A, Anderson, MR, Andringa, S, Antunes, J, Askins, M, Auty, DJ, Bacon, A, Barros, N, Barão, F, Bayes, R, Beier, EW, Bezerra, TS, Bialek, A, Biller, SD, Blucher, E, Caden, E, Callaghan, EJ, Cheng, S, Chen, M, Cleveland, B, Cookman, D, Corning, J, Cox, MA, Dehghani, R, Deloye, J, Deluce, C, Depatie, MM, Dittmer, J, Dixon, KH, Di Lodovico, F, Falk, E, Fatemighomi, N, Ford, R, Frankiewicz, K, Gaur, A, González-Reina, OI, Gooding, D, Grant, C, Grove, J, Hallin, AL, Hallman, D, Heintzelman, WJ, Helmer, RL, 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, Lam, I, Land, BJ, Lawson, I, Lebanowski, L, Lee, J, Lefebvre, C, Lidgard, J, Lin, YH, Lozza, V, Luo, M, Maio, A, Manecki, S, Maneira, J, Martin, RD, McCauley, N, McDonald, AB, Mills, C, Morton-Blake, I, Naugle, S, Nolan, LJ, O’Keeffe, HM, Gann, GD Orebi, Page, J, Parker, W, Paton, J, Peeters, SJM, Pickard, L, Ravi, P, Reichold, A, Riccetto, S, Richardson, R, Rigan, M, Rose, J, Rosero, R, Rumleskie, J, Semenec, I, Skensved, P, Smiley, M, Svoboda, R, Tam, B, Tseng, J, and Turner, E

Subjects
Nuclear and Plasma Physics, Physical Sciences, SNO+ Collaboration, Mathematical Sciences, Engineering, General Physics, Mathematical sciences, Physical sciences
Abstract

The SNO+ Collaboration reports the first evidence of reactor antineutrinos in a Cherenkov detector. The nearest nuclear reactors are located 240 km away in Ontario, Canada. This analysis uses events with energies lower than in any previous analysis with a large water Cherenkov detector. Two analytical methods are used to distinguish reactor antineutrinos from background events in 190 days of data and yield consistent evidence for antineutrinos with a combined significance of 3.5σ.

Published
2023

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

Author

Allega, A, Anderson, MR, Andringa, S, Askins, M, Auty, DJ, Bacon, A, Barros, N, Barão, F, Bayes, R, Beier, EW, Bezerra, TS, Bialek, A, Biller, SD, Blucher, E, Caden, E, Callaghan, EJ, Cheng, S, Chen, M, Chkvorets, O, Cleveland, B, Cookman, D, Corning, J, Cox, MA, Dehghani, R, Deluce, C, Depatie, MM, Dittmer, J, Dixon, KH, Di Lodovico, F, Falk, E, Fatemighomi, N, Ford, R, Frankiewicz, K, Gaur, A, 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, Lawson, I, Lebanowski, L, Lee, J, Lefebvre, C, Lidgard, J, Lin, YH, Lozza, V, Luo, M, Maio, A, Manecki, S, Maneira, J, Martin, RD, McCauley, N, McDonald, AB, Meyer, M, Mills, C, Morton-Blake, I, Naugle, S, Nolan, LJ, O’Keeffe, HM, Gann, GD Orebi, Page, J, Parker, W, Paton, J, Peeters, SJM, Pickard, L, Ravi, P, Reichold, A, Riccetto, S, Richardson, R, Rigan, M, Rose, J, Rumleskie, J, Semenec, I, Skensved, P, Smiley, M, Svoboda, R, Tam, B, Tseng, J, Turner, E, and Valder, S

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Synchrotrons and Accelerators, Physical Sciences
Abstract

This paper reports results from a search for single and multinucleon disappearance from the O16 nucleus in water within the SNO+ detector using all of the available data. These so-called "invisible"decays do not directly deposit energy within the detector but are instead detected through their subsequent nuclear deexcitation and gamma-ray emission. New limits are given for the partial lifetimes: τ(n→inv)>9.0×1029 years, τ(p→inv)>9.6×1029 years, τ(nn→inv)>1.5×1028 years, τ(np→inv)>6.0×1028 years, and τ(pp→inv)>1.1×1029 years at 90% Bayesian credibility level (with a prior uniform in rate). All but the (nn→inv) results improve on existing limits by a factor of about 3.

Published
2022

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

Author

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, Gann, GD Orebi, 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

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Synchrotrons and Accelerators, Physical Sciences, Analysis and statistical methods, Cherenkov detectors, Detector alignment and calibration methods, Neutrino detectors, Engineering, Nuclear & Particles Physics, Physical sciences
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

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

Author

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, 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, Kraus, C, Krauss, CB, Krüger, A, 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, and Poon, AWP

Subjects
hep-ex, nucl-ex
Abstract

A search has been performed for neutrinos from two sources, the hep reaction in the solar pp fusion chain and the νe 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 φhep

Published
2020

6. Measurement of neutron-proton capture in the SNO+ water phase

Author

Anderson, MR, Andringa, S, Askins, M, Auty, DJ, Barros, N, 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, Cox, MA, Depatie, MM, Dittmer, J, Di Lodovico, F, Earle, AD, Falk, E, Fatemighomi, N, Fischer, V, Fletcher, E, Ford, R, Frankiewicz, K, Gilje, K, Gooding, D, Grant, C, Grove, J, Hallin, AL, Hallman, D, Hans, S, Hartnell, J, Harvey, P, Heintzelman, WJ, Helmer, RL, Horne, D, Hreljac, B, Hu, J, Hussain, ASM, 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, Latorre, A, Lawson, I, Lebanowski, L, Leming, EJ, Li, A, Lidgard, J, Liggins, B, Lin, YH, 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, Mills, C, Morton-Blake, I, Nae, S, Nirkko, M, Nolan, LJ, O'Keeffe, HM, Orebi Gann, GD, Parnell, MJ, Paton, J, Peeters, SJM, Pershing, T, Pickard, L, Prior, G, Reichold, A, Riccetto, S, Richardson, R, Rigan, M, Rose, J, and Rosero, R

Subjects
physics.ins-det, hep-ex, nucl-ex, Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

The SNO+ experiment collected data as a low-threshold water Cherenkov detector from September 2017 to July 2019. Measurements of the 2.2-MeV γ's produced by neutron capture on hydrogen were made using an Am-Be calibration source, for which a large fraction of emitted neutrons are produced simultaneously with a 4.4-MeV γ. Analysis of the delayed coincidence between the 4.4-MeV γ and the 2.2-MeV capture γ revealed a neutron detection efficiency that is centered around 50% and varies at the level of 1% across the inner region of the detector, which to our knowledge is the highest efficiency achieved among pure water Cherenkov detectors. In addition, the neutron capture time constant was measured and converted to a thermal neutron-proton capture cross section of 336.3-1.5+1.2mb.

Published
2020

7. Cosmogenic neutron production at the Sudbury Neutrino Observatory

Author

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, Curley, R, 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, 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, Kéfélian, C, Keeter, KJ, Klein, JR, Kormos, LL, Kos, M, Krüger, 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, Orebi Gann, GD, Oser, SM, Ott, RA, Peeters, SJM, Poon, AWP, and Prior, G

Subjects
hep-ex, nucl-ex
Abstract

Neutrons produced in nuclear interactions initiated by cosmic-ray muons present an irreducible background to many rare-event searches, even in detectors located deep underground. Models for the production of these neutrons have been tested against previous experimental data, but the extrapolation to deeper sites is not well understood. Here we report results from an analysis of cosmogenically produced neutrons at the Sudbury Neutrino Observatory. A specific set of observables are presented, which can be used to benchmark the validity of geant4 physics models. In addition, the cosmogenic neutron yield, in units of 10-4 cm2/(g·μ), is measured to be 7.28±0.09(stat)-1.12+1.59(syst) in pure heavy water and 7.30±0.07(stat)-1.02+1.40(syst) in NaCl-loaded heavy water. These results provide unique insights into this potential background source for experiments at SNOLAB.

Published
2019

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

Author

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

Subjects
hep-ex
Abstract

Neutron production in GeV-scale neutrino interactions is a poorly studiedprocess. We have measured the neutron multiplicities in atmospheric neutrinointeractions in the Sudbury Neutrino Observatory experiment and compared themto the prediction of a Monte Carlo simulation using GENIE and a minimallymodified version of GEANT4. We analyzed 837 days of exposure corresponding toPhase I, using pure heavy water, and Phase II, using a mixture of Cl in heavywater. Neutrons produced in atmospheric neutrino interactions were identifiedwith 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 theneutrino interaction and, for charged current quasi-elastic interactioncandidates, also as a function of the neutrino energy. This study is alsoperformed 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 andMonte Carlo for both phases, with some small tension with a statisticalsignificance below $2\sigma$ for some intermediate energies.

Published
2019

9. Constraints on neutrino lifetime from the Sudbury Neutrino Observatory

Author

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, J TM, 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, 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, and Reitzner, SD

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, nucl-ex
Abstract

The long baseline between Earth and the Sun makes solar neutrinos an excellent test beam for exploring possible neutrino decay. The signature of such decay would be an energy-dependent distortion of the traditional survival probability which can be fit for using well-developed and high-precision analysis methods. Here a model including neutrino decay is fit to all three phases of B8 solar neutrino data taken by the Sudbury Neutrino Observatory (SNO). This fit constrains the lifetime of neutrino mass state ν2 to be >8.08×10-5 s/eV at 90% confidence. An analysis combining this SNO result with those from other solar neutrino experiments results in a combined limit for the lifetime of mass state ν2 of >1.92×10-3 s/eV at 90% confidence.

Published
2019

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

Author

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

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Synchrotrons and Accelerators, Physical Sciences, hep-ex, physics.ins-det
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

11. Measurement of the B8 solar neutrino flux in SNO+ with very low backgrounds

Author

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, Gann, GD Orebi, 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

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex
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

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

Author

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

Subjects
hep-ex
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

13. Tests of Lorentz invariance at the Sudbury Neutrino Observatory

Author

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, 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, J TM, 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, Gann, GD Orebi, Oser, SM, Ott, RA, and Peeters, SJM

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, nucl-ex
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

14. Search for neutron-Antineutron oscillations at the Sudbury Neutrino Observatory

Author

Aharmim, B, Ahmed, SN, Anthony, AE, Barros, N, Beier, EW, Bellerive, A, Beltran, B, Bergevin, M, Biller, SD, Boudjemline, K, Boulay, MG, Cai, B, Chan, YD, Chauhan, D, Chen, M, Cleveland, BT, Cox, GA, Dai, X, Deng, H, Detwiler, JA, Doe, PJ, Doucas, G, Drouin, PL, Duncan, FA, Dunford, M, Earle, ED, Elliott, SR, Evans, HC, Ewan, GT, Farine, J, Fergani, H, Fleurot, F, Ford, RJ, Formaggio, JA, Gagnon, N, 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, Keeter, KJ, Klein, JR, Kormos, LL, Kos, M, Krüger, A, Kraus, C, Krauss, CB, Kutter, T, Kyba, CCM, Lange, R, Law, J, Lawson, IT, Lesko, KT, Leslie, JR, Levine, I, Loach, JC, Maclellan, R, Majerus, S, Mak, HB, Maneira, J, Martin, RD, 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, Poon, AWP, Prior, G, Reitzner, SD, Rielage, K, Robertson, BC, Robertson, RGH, Schwendener, MH, Secrest, JA, and Seibert, SR

Subjects
hep-ex, nucl-ex, physics.ins-det
Abstract

Tests on B-L symmetry breaking models are important probes to search for new physics. One proposed model with Δ(B-L)=2 involves the oscillations of a neutron to an antineutron. In this paper, a new limit on this process is derived for the data acquired from all three operational phases of the Sudbury Neutrino Observatory experiment. The search concentrated on oscillations occurring within the deuteron, and 23 events were observed against a background expectation of 30.5 events. These translated to a lower limit on the nuclear lifetime of 1.48×1031 yr at 90% C.L. when no restriction was placed on the signal likelihood space (unbounded). Alternatively, a lower limit on the nuclear lifetime was found to be 1.18×1031 yr at 90% C.L. when the signal was forced into a positive likelihood space (bounded). Values for the free oscillation time derived from various models are also provided in this article. This is the first search for neutron-Antineutron oscillation with the deuteron as a target.

Published
2017

15. Current Status and Future Prospects of the SNO+ Experiment

Author

Andringa, S, Arushanova, E, Asahi, S, Askins, M, Auty, DJ, Back, AR, Barnard, Z, Barros, N, Beier, EW, Bialek, A, Biller, SD, Blucher, E, Bonventre, R, Braid, D, Caden, E, Callaghan, E, Caravaca, J, Carvalho, J, Cavalli, L, Chauhan, D, Chen, M, Chkvorets, O, Clark, K, Cleveland, B, Coulter, IT, Cressy, D, Dai, X, Darrach, C, Davis-Purcell, B, Deen, R, Depatie, MM, Descamps, F, Di Lodovico, F, Duhaime, N, Duncan, F, Dunger, J, Falk, E, Fatemighomi, N, Ford, R, Gorel, P, Grant, C, Grullon, S, Guillian, E, Hallin, AL, Hallman, D, Hans, S, Hartnell, J, Harvey, P, Hedayatipour, M, Heintzelman, WJ, Helmer, RL, Hreljac, B, Hu, J, Iida, T, Jackson, CM, Jelley, NA, Jillings, C, Jones, C, Jones, PG, Kamdin, K, Kaptanoglu, T, Kaspar, J, Keener, P, Khaghani, P, Kippenbrock, L, Klein, JR, Knapik, R, Kofron, JN, Kormos, LL, Korte, S, Kraus, C, Krauss, CB, Labe, K, Lam, I, Lan, C, Land, BJ, Langrock, S, LaTorre, A, Lawson, I, Lefeuvre, GM, Leming, EJ, Lidgard, J, Liu, X, Liu, Y, Lozza, V, Maguire, S, Maio, A, Majumdar, K, Manecki, S, Maneira, J, Marzec, E, Mastbaum, A, McCauley, N, McDonald, AB, McMillan, JE, Mekarski, P, Miller, C, Mohan, Y, Mony, E, and Mottram, MJ

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, physics.ins-det, hep-ex, Mathematical Sciences, Mathematical sciences, Physical sciences
Abstract

SNO+ is a large liquid scintillator-based experiment located 2 km underground at SNOLAB, Sudbury, Canada. It reuses the Sudbury Neutrino Observatory detector, consisting of a 12 m diameter acrylic vessel which will be filled with about 780 tonnes of ultra-pure liquid scintillator. Designed as a multipurpose neutrino experiment, the primary goal of SNO+ is a search for the neutrinoless double-beta decay (0ββ) of 130Te. In Phase I, the detector will be loaded with 0.3% natural tellurium, corresponding to nearly 800 kg of 130Te, with an expected effective Majorana neutrino mass sensitivity in the region of 55-133 meV, just above the inverted mass hierarchy. Recently, the possibility of deploying up to ten times more natural tellurium has been investigated, which would enable SNO+ to achieve sensitivity deep into the parameter space for the inverted neutrino mass hierarchy in the future. Additionally, SNO+ aims to measure reactor antineutrino oscillations, low energy solar neutrinos, and geoneutrinos, to be sensitive to supernova neutrinos, and to search for exotic physics. A first phase with the detector filled with water will begin soon, with the scintillator phase expected to start after a few months of water data taking. The 0νββ Phase I is foreseen for 2017.

Published
2016

16. The SNO+ Experiment

Author

Collaboration, SNO, Albanese, V, Alves, R, Anderson, MR, Andringa, S, Anselmo, L, Arushanova, E, Asahi, S, Askins, M, Auty, DJ, Back, AR, Back, S, Barão, F, Barnard, Z, Barr, A, Barros, N, Bartlett, D, Bayes, R, Beaudoin, C, Beier, EW, Berardi, G, 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, Cookman, D, Coulter, IT, Cox, MA, Cressy, D, Dai, X, Darrach, C, Davis-Purcell, B, Deluce, C, Depatie, MM, Descamps, F, Lodovico, F Di, Dittmer, J, Doxtator, A, Duhaime, N, Duncan, F, Dunger, J, Earle, AD, Fabris, D, Falk, E, Farrugia, A, Fatemighomi, N, Felber, C, Fischer, V, Fletcher, E, Ford, R, Frankiewicz, K, Gagnon, N, Gaur, A, Gauthier, J, Gibson-Foster, A, Gilje, K, González-Reina, OI, Gooding, D, Gorel, P, Graham, K, Grant, C, Grove, J, Grullon, S, Guillian, E, Hall, S, Hallin, AL, Hallman, D, Hans, S, Hartnell, J, Harvey, P, Hedayatipour, M, Heintzelman, WJ, Heise, J, Helmer, RL, Hodak, B, Hodak, M, Hood, M, Horne, D, Hreljac, B, Hu, J, Hussain, SMA, 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, Korte, S, Krar, B, Kraus, C, Krauss, CB, Kroupová, T, Labe, K, Lafleur, F, Lam, I, Lan, C, Land, BJ, Lane, R, Langrock, S, Larochelle, P, Larose, S, LaTorre, A, Lawson, I, Lebanowski, L, Lefeuvre, GM, Leming, EJ, Li, A, Li, O, Lidgard, J, Liggins, B, Liimatainen, P, Lin, YH, Liu, X, Liu, Y, Lozza, V, Luo, M, Maguire, S, Maio, A, Majumdar, K, Manecki, S, Maneira, J, Martin, RD, Marzec, E, Mastbaum, A, Mathewson, A, McCauley, N, McDonald, AB, McFarlane, K, Mekarski, P, Meyer, M, Miller, C, Mills, C, Mlejnek, M, Mony, E, Morissette, B, Morton-Blake, I, Mottram, MJ, Nae, S, Nirkko, M, Nolan, LJ, Novikov, VM, O'Keeffe, HM, O'Sullivan, E, Gann, GD Orebi, Parnell, MJ, Paton, J, Peeters, SJM, Pershing, T, Petriw, Z, Petzoldt, J, Pickard, L, Pracsovics, D, Prior, G, Prouty, JC, Quirk, S, Read, S, Reichold, A, Riccetto, S, Richardson, R, Rigan, M, Ritchie, I, Robertson, A, Robertson, BC, Rose, J, Rosero, R, Rost, PM, Rumleskie, J, Schumaker, MA, Schwendener, MH, Scislowski, D, Secrest, J, Seddighin, M, Segui, L, Seibert, S, Semenec, I, Shaker, F, Shantz, T, Sharma, MK, Shokair, TM, Sibley, L, Sinclair, JR, Singh, K, Skensved, P, Smiley, M, Sonley, T, Sörensen, A, St-Amant, M, Stainforth, R, Stankiewicz, S, Strait, M, Stringer, MI, Stripay, A, Svoboda, R, Tacchino, S, Tam, B, Tanguay, C, Tatar, J, Tian, L, Tolich, N, Tseng, J, Tseung, HWC, Turner, E, Berg, R Van, Vázquez-Jáuregui, E, Veinot, JGC, Virtue, CJ, Krosigk, B von, Walker, JMG, Walker, M, Wallig, J, Walton, SC, Wang, J, Ward, M, Wasalski, O, Waterfield, J, Weigand, JJ, White, RF, Wilson, JR, Winchester, TJ, Woosaree, P, Wright, A, Yanez, JP, Yeh, M, Zhang, T, Zhang, Y, Zhao, T, Zuber, K, and Zummo, A

Abstract

The SNO+ experiment is located 2 km underground at SNOLAB in Sudbury, Canada. A low background search for neutrinoless double beta ($0\nu\beta\beta$) decay will be conducted using 780 tonnes of liquid scintillator loaded with 3.9 tonnes of natural tellurium, corresponding to 1.3 tonnes of $^{130}$Te. This paper provides a general overview of the SNO+ experiment, including detector design, construction of process plants, commissioning efforts, electronics upgrades, data acquisition systems, and calibration techniques. The SNO+ collaboration is reusing the acrylic vessel, PMT array, and electronics of the SNO detector, having made a number of experimental upgrades and essential adaptations for use with the liquid scintillator. With low backgrounds and a low energy threshold, the SNO+ collaboration will also pursue a rich physics program beyond the search for $0\nu\beta\beta$ decay, including studies of geo- and reactor antineutrinos, supernova and solar neutrinos, and exotic physics such as the search for invisible nucleon decay. The SNO+ approach to the search for $0\nu\beta\beta$ decay is scalable: a future phase with high $^{130}$Te-loading is envisioned to probe an effective Majorana mass in the inverted mass ordering region.

Published
2021

17. Contributions to ICRC 2015: The Next Generation Neutrino Observatory at the South Pole

Author

Aartsen, MG, Abraham, K, Ackermann, M, Adams, J, Aguilar, JA, Ahlers, M, Ahrens, M, Altmann, D, Anderson, T, Ansseau, I, Anton, G, Archinger, M, Arguelles, C, Arlen, TC, Auffenberg, J, Axani, S, Bai, X, Bartos, I, Barwick, SW, Baum, V, Bay, R, Beatty, JJ, Tjus, JB, Becker, K-H, Beiser, E, Benzvi, S, Berghaus, P, Berley, D, Bernardini, E, Bernhard, A, Besson, DZ, Binder, G, Bindig, D, Bissok, M, Blaufuss, E, Blumenthal, J, Boersma, DJ, Bohm, C, Börner, M, Bos, F, Bose, D, Böser, S, Botner, O, Braun, J, Brayeur, L, Bretz, H-P, Buzinsky, N, Casey, J, Casier, M, Cheung, E, Chirkin, D, Christov, A, Clark, K, Classen, L, Coenders, S, Collin, GH, Conrad, JM, Cowen, DF, Silva, AHC, Daughhetee, J, Davis, JC, Day, M, André, JPAMD, Clercq, CD, Rosendo, EDP, Dembinski, H, Ridder, SD, Desiati, P, Vries, KDD, Wasseige, GD, With, MD, Deyoung, T, Diaz-Vélez, JC, Lorenzo, VD, Dumm, JP, Dunkman, M, Eagan, R, Eberhardt, B, Ehrhardt, T, Eichmann, B, Euler, S, Evans, JJ, Evenson, PA, Fadiran, O, Fahey, S, Fazely, AR, Fedynitch, A, Feintzeig, J, Felde, J, Filimonov, K, Finley, C, Fischer-Wasels, T, Flis, S, Fösig, C-C, Fuchs, T, Gaisser, TK, Gaior, R, Gallagher, J, Gerhardt, L, Ghorbani, K, Gier, D, Gladstone, L, Glagla, M, Glüsenkamp, T, Goldschmidt, A, Golup, G, Gonzalez, JG, Góra, D, Grant, D, Groh, JC, Groß, A, Ha, C, Haack, C, Ismail, AH, Hallgren, A, Halzen, F, Hansmann, B, Hanson, K, Haugen, J, Hebecker, D, Heereman, D, Helbing, K, Hellauer, R, Hellwig, D, Hickford, S, Hignight, J, Hill, GC, Hoffman, KD, Hoffmann, R, Holzapfel, K, Homeier, A, Hoshina, K, Huang, F, Huber, M, Huelsnitz, W, Hulth, PO, Hultqvist, K, In, S, Ishihara, A, Jacobi, E, Japaridze, GS, Jero, K, Jones, BJP, Jurkovic, M, Kalekin, O, Kaminsky, B, Kappes, A, Karg, T, Karle, A, Katori, T, Katz, U, Kauer, M, Keivani, A, Kelley, JL, Kemp, J, Kheirandish, A, Kiryluk, J, Kläs, J, Klein, SR, Kohnen, G, Koirala, R, Kolanoski, H, Konietz, R, Koob, A, Köpke, L, Kopper, C, Kopper, S, Koskinen, DJ, Kowalski, M, Krauss, CB, Krings, K, Kroll, G, Kroll, M, Kunnen, J, Kurahashi, N, Kuwabara, T, Labare, M, Lanfranchi, JL, Larson, MJ, Lesiak-Bzdak, M, Leuermann, M, Leuner, J, Losecco, J, Lu, L, Lünemann, J, Madsen, J, Maggi, G, Mahn, KBM, Marka, S, Marka, Z, Maruyama, R, Mase, K, Matis, HS, Maunu, R, McNally, F, Meagher, K, Medici, M, Meli, A, Menne, T, Merino, G, Meures, T, Miarecki, S, Middell, E, Middlemas, E, Mohrmann, L, Montaruli, T, Moore, RW, Morse, R, Nahnhauer, R, Naumann, U, Neer, G, Niederhausen, H, Nowicki, SC, Nygren, DR, Obertacke, A, Olivas, A, Omairat, A, O'Murchadha, A, Palazzo, A, Palczewski, T, Pandya, H, Paul, L, Pepper, JA, Heros, CPDL, Petersen, TC, Pfendner, C, Pieloth, D, Pinat, E, Pinfold, JL, Posselt, J, Price, PB, Przybylski, GT, Pütz, J, Quinnan, M, Raab, C, Rädel, L, Rameez, M, Rawlins, K, Reimann, R, Relich, M, Resconi, E, Rhode, W, Richman, M, Richter, S, Riedel, B, Robertson, S, Rongen, M, Rott, C, Ruhe, T, Ryckbosch, D, Saba, SM, Sabbatini, L, Sander, H-G, Sandrock, A, Sandroos, J, Sandstrom, P, Sarkar, S, Schatto, K, Scheriau, F, Schimp, M, Schmidt, T, Schmitz, M, Schoenen, S, Schöneberg, S, Schönwald, A, Schulte, L, Seckel, D, Seunarine, S, Shaevitz, MH, Shanidze, R, Smith, MWE, Soldin, D, Söldner-Rembold, S, Song, M, Spiczak, GM, Spiering, C, Stahlberg, M, Stamatikos, M, Stanev, T, Stanisha, NA, Stasik, A, Stezelberger, T, Stokstad, RG, Stößl, A, Ström, R, Strotjohann, NL, Sullivan, GW, Sutherland, M, Taavola, H, Taboada, I, Taketa, A, Tanaka, HKM, Ter-Antonyan, S, Terliuk, A, Tešić, G, Tilav, S, Toale, PA, Tobin, MN, Toscano, S, Tosi, D, Tselengidou, M, Turcati, A, Unger, E, Usner, M, Vallecorsa, S, Vandenbroucke, J, Eijndhoven, NV, Vanheule, S, Santen, JV, Veenkamp, J, Vehring, M, Voge, M, Vraeghe, M, Walck, C, Wallace, A, Wallraff, M, Wandkowsky, N, Weaver, C, Wendt, C, Westerhoff, S, Whelan, BJ, Whitehorn, N, Wichary, C, Wiebe, K, Wiebusch, CH, Wille, L, Williams, DR, Wissing, H, Wolf, M, Wood, TR, Woschnagg, K, Wren, S, Xu, DL, Xu, XW, Xu, Y, Yanez, JP, Yodh, G, Yoshida, S, Zoll, M, and Collaboration, IceCube-Gen2

Published
2015

18. Determination of the nu(e) and total B-8 solar neutrino fluxes using the Sudbury Neutrino Observatory Phase I data set

Author

Aharmim, B, Ahmad, QR, Ahmed, SN, Allen, RC, Andersen, TC, Anglin, JD, Buehler, G, Barton, JC, Beier, EW, Bercovitch, M, Bergevin, M, Bigu, J, Biller, SD, Black, RA, Blevis, I, Boardman, RJ, Boger, J, Bonvin, E, Boulay, MG, Bowler, MG, Bowles, TJ, Brice, SJ, Browne, MC, Bullard, TV, Burritt, TH, Cameron, J, Chan, YD, Chen, HH, Chen, M, Chen, X, Cleveland, BT, Cowan, JHM, Cowen, DF, Cox, GA, Currat, CA, Dai, X, Dalnoki-Veress, F, Davidson, WF, Deng, H, DiMarco, M, Doe, PJ, Doucas, G, Dragowsky, MR, Duba, CA, Duncan, FA, Dunford, M, Dunmore, JA, Earle, ED, Elliott, SR, Evans, HC, Ewan, GT, Farine, J, Fergani, H, Ferraris, AP, Fleurot, F, Ford, RJ, Formaggio, JA, Fowler, MM, Frame, K, Frank, ED, Frati, W, Gagnon, N, Germani, JV, Gil, S, Goldschmidt, A, Goon, JTM, Graham, K, Grant, DR, Guillian, E, Hahn, RL, Hallin, AL, Hallman, ED, Hamer, AS, Hamian, AA, Handler, WB, Haq, RU, Hargrove, CK, Harvey, PJ, Hazama, R, Heeger, KM, Heintzelman, WJ, Heise, J, Helmer, RL, Henning, R, Hepburn, JD, Heron, H, Hewett, J, Hime, A, Howard, C, Howe, MA, Huang, M, Hykaway, JG, Isaac, MCP, Jagam, P, Jamieson, B, Jelley, NA, Jillings, C, Jonkmans, G, Kazkaz, K, Keener, PT, Kirch, K, Klein, JR, Knox, AB, Komar, RJ, Kormos, LL, Kos, M, Kouzes, R, Krueger, A, Kraus, C, Krauss, CB, Kutter, T, Kyba, CCM, Labranche, H, Lange, R, Law, J, Lawson, IT, Lay, M, Lee, HW, Lesko, KT, Leslie, JR, Levine, I, Loach, JC, Locke, W, Luoma, S, Lyon, J, MacLellan, R, Majerus, S, Mak, HB, Maneira, J, Marino, AD, Martin, R, McCauley, N, McDonald, AB, McDonald, DS, McFarlane, K, McGee, S, McGregor, G, Drees, RM, Mes, H, Mifflin, C, Miknaitis, KKS, Miller, ML, Milton, G, Moffat, BA, Monreal, B, Moorhead, M, Morrissette, B, Nally, CW, Neubauer, MS, Newcomer, FM, Ng, HS, Nickel, BG, Noble, AJ, Norman, EB, Novikov, VM, Oblath, NS, Okada, CE, O'Keeffe, HM, Ollerhead, RW, Omori, M, Orrell, JL, Oser, SM, Ott, R, Peeters, SJM, Poon, AWP, Prior, G, Reitzner, SD, Rielage, K, Roberge, A, Robertson, BC, Robertson, RGH, Rosendahl, SSE, Rowley, JK, Rusu, VL, Saettler, E, Schulke, A, Schwendener, MH, Secrest, JA, Seifert, H, Shatkay, M, Simpson, JJ, Sims, CJ, Sinclair, D, Skensved, P, Smith, AR, Smith, MWE, Starinsky, N, Steiger, TD, Stokstad, RG, Stonehill, LC, Storey, RS, Sur, B, Tafirout, R, Tagg, N, Takeuchi, Y, Tanner, NW, Taplin, RK, Thorman, M, Thornewell, PM, Tolich, N, Trent, PT, Tserkovnyak, YI, Tsui, T, Tunnell, CD, Van Berg, R, De Water, RGV, Virtue, CJ, Walker, TJ, Wall, BL, Waltham, CE, Tseung, HWC, Wang, J-X, Wark, DL, Wendland, J, West, N, Wilhelmy, JB, Wilkerson, JF, Wilson, JR, Wittich, P, Wouters, JM, Wright, A, Yeh, M, Zuber, K, and Collaboration, SNO

Published
2007

19. Electron energy spectra, fluxes, and day-night asymmetries of B-8 solar neutrinos from measurements with NaCl dissolved in the heavy-water detector at the Sudbury Neutrino Observatory

Author

Aharmim, B, Ahmed, SN, Anthony, AE, Beier, EW, Bellerive, A, Bergevin, M, Biller, SD, Boger, J, Boulay, MG, Bowler, MG, Bullard, TV, Chan, YD, Chen, M, Chen, X, Cleveland, BT, Cox, GA, Currat, CA, Dai, X, Dalnoki-Veress, F, Deng, H, Doe, PJ, Dosanjh, RS, Doucas, G, Duba, CA, Duncan, FA, Dunford, M, Dunmore, JA, Earle, ED, Elliott, SR, Evans, HC, Ewan, GT, Farine, J, Fergani, H, Fleurot, F, Formaggio, JA, Frame, K, Frati, W, Fulsom, BG, Gagnon, N, Graham, K, Grant, DR, Hahn, RL, Hall, JC, Hallin, AL, Hallman, ED, Handler, WB, Hargrove, CK, Harvey, PJ, Hazama, R, Heeger, KM, Heelan, L, Heintzelman, WJ, Heise, J, Helmer, RL, Hemingway, RJ, Hime, A, Howard, C, Howe, MA, Huang, M, Jagam, P, Jelley, NA, Klein, JR, Kormos, LL, Kos, MS, Kruger, A, Kraus, C, Krauss, CB, Krumins, AV, Kutter, T, Kyba, CCM, Labranche, H, Lange, R, Law, J, Lawson, IT, Lesko, KT, Leslie, JR, Levine, I, Loach, JC, Luoma, S, MacLellan, R, Majerus, S, Mak, HB, Maneira, J, Marino, AD, McCauley, N, McDonald, AB, McGee, S, McGregor, G, Mifflin, C, Miknaitis, KKS, Moffat, BA, Nally, CW, Neubauer, MS, Nickel, BG, Noble, AJ, Norman, EB, Oblath, NS, Okada, CE, Ollerhead, RW, Orrell, JL, Oser, SM, Ouellet, C, Peeters, SJM, Poon, AWP, Rielage, K, Robertson, BC, Robertson, RGH, Rollin, E, Rosendahl, SSE, Rusu, VL, Schwendener, MH, Seibert, SR, Simard, O, Simpson, JJ, Sims, CJ, Sinclair, D, Skensved, P, Smith, MWE, Starinsky, N, Stokstad, RG, Stonehill, LC, Tafirout, R, Takeuchi, Y, Tesic, G, Thomson, M, Thorman, M, Tsui, T, Van Berg, R, Van de Water, RG, Virtue, CJ, Wall, BL, Waller, D, Waltham, CE, Tseung, HWC, Wark, DL, Wendland, J, West, N, Wilkerson, JF, Wilson, JR, Wittich, P, Wouters, JM, Wright, A, Yeh, M, Zuber, K, and Collaboration, SNO

Subjects
High Energy Physics::Experiment, Astrophysics::Cosmology and Extragalactic Astrophysics, Nuclear Experiment
Abstract

Results are reported from the complete salt phase of the Sudbury Neutrino Observatory experiment in which NaCl was dissolved in the H22O ("D2O") target. The addition of salt enhanced the signal from neutron capture as compared to the pure D2O detector. By making a statistical separation of charged-current events from other types based on event-isotropy criteria, the effective electron recoil energy spectrum has been extracted. In units of 106cm-2s-1, the total flux of active-flavor neutrinos from B8 decay in the Sun is found to be 4.94-0.21+0.21(stat)-0.34+0.38(syst) and the integral flux of electron neutrinos for an undistorted B8 spectrum is 1.68-0.06+0.06(stat)-0. 09+0.08(syst); the signal from (νx,e) elastic scattering is equivalent to an electron-neutrino flux of 2.35-0.22+0.22(stat)-0.15+0.15(syst). These results are consistent with those expected for neutrino oscillations with the so-called large mixing angle parameters and also with an undistorted spectrum. A search for matter-enhancement effects in the Earth through a possible day-night asymmetry in the charged-current integral rate is consistent with no asymmetry. Including results from other experiments, the best-fit values for two-neutrino mixing parameters are Δm2=(8.0-0.4+0.6)×10-5 eV2 and θ=33.9-2.2+2.4 degrees. © 2005 The American Physical Society.

Published
2005

20. Search for periodicities in the B8 solar neutrino flux measured by the Sudbury Neutrino Observatory

Author

Aharmim, B, Ahmed, SN, Anthony, AE, Beier, EW, Bellerive, A, Bergevin, M, Biller, SD, Boulay, MG, Bowler, MG, Chan, YD, Chen, M, Chen, X, Cleveland, BT, Costin, T, Cox, GA, Currat, CA, Dai, X, Deng, H, Detwiler, J, Doe, PJ, Dosanjh, RS, Doucas, G, Duba, CA, Duncan, FA, Dunford, M, Dunmore, JA, Earle, ED, Elliott, SR, Evans, HC, Ewan, GT, Farine, J, Fergani, H, Fleurot, F, Formaggio, JA, Frati, W, Fulsom, BG, Gagnon, N, Goon, JTM, Graham, K, Hahn, RL, Hallin, AL, Hallman, ED, Handler, WB, Hargrove, CK, Harvey, PJ, Hazama, R, Heeger, KM, Heelan, L, Heintzelman, WJ, Heise, J, Helmer, RL, Hemingway, RJ, Hime, A, Howe, MA, Huang, M, Inrig, E, Jagam, P, Jelley, NA, Klein, JR, Kormos, LL, Kos, MS, Krüger, A, Kraus, C, Krauss, CB, Krumins, AV, Kutter, T, Kyba, CCM, Labranche, H, Lange, R, Law, J, Lawson, IT, Lesko, KT, Leslie, JR, Levine, I, Loach, JC, Luoma, S, MacLellan, R, Majerus, S, Maneira, J, Marino, AD, McCauley, N, McDonald, AB, McGee, S, Mifflin, C, Miknaitis, KKS, Nickel, BG, Noble, AJ, Norman, EB, Oblath, NS, Okada, CE, O'Keeffe, HM, Ollerhead, RW, Gann, GDO, Orrell, JL, Oser, SM, Ouvarova, T, Peeters, SJM, Poon, AWP, Pun, CSJ, Rielage, K, Robertson, BC, Robertson, RGH, Rollin, E, Rosendahl, SSE, Schwendener, MH, Seibert, SR, Simard, O, Simpson, JJ, Sims, CJ, Sinclair, D, Sinclair, L, Skensved, P, Smith, MWE, Stokstad, RG, Stonehill, LC, Tafirout, R, Takeuchi, Y, Tešić, G, Thomson, M, Tsang, KV, Tsui, T, Berg, RV, Virtue, CJ, Wall, BL, Waller, D, Waltham, CE, Tseung, HWC, Wark, DL, Wendland, J, West, N, Wilkerson, JF, Wilson, JR, Wouters, JM, Yeh, M, and Zuber, K

Subjects
Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Experiment
Abstract

A search has been made for sinusoidal periodic variations in the B8 solar neutrino flux using data collected by the Sudbury Neutrino Observatory over a 4-year time interval. The variation at a period of 1 yr is consistent with modulation of the B8 neutrino flux by the Earth's orbital eccentricity. No significant sinusoidal periodicities are found with periods between 1 d and 10 years with either an unbinned maximum likelihood analysis or a Lomb-Scargle periodogram analysis. The data are inconsistent with the hypothesis that the results of the recent analysis by Sturrock et al., based on elastic scattering events in Super-Kamiokande, can be attributed to a 7% sinusoidal modulation of the total B8 neutrino flux. © 2005 The American Physical Society.

Published
2005

21. Search for periodicities in the B-8 solar neutrino flux measured by the Sudbury Neutrino Observatory

Author

Aharmim, B, Ahmed, SN, Anthony, AE, Beier, EW, Bellerive, A, Bergevin, M, Biller, SD, Boulay, MG, Bowler, MG, Chan, YD, Chen, M, Chen, X, Cleveland, BT, Costin, T, Cox, GA, Currat, CA, Dai, X, Deng, H, Detwiler, J, Doe, PJ, Dosanjh, RS, Doucas, G, Duba, CA, Duncan, FA, Dunford, M, Dunmore, JA, Earle, ED, Elliott, SR, Evans, HC, Ewan, GT, Farine, J, Fergani, H, Fleurot, F, Formaggio, JA, Frati, W, Fulsom, BG, Gagnon, N, Goon, JT, Graham, K, Hahn, RL, Hallin, AL, Hallman, ED, Handler, WB, Hargrove, CK, Harvey, PJ, Hazama, R, Heeger, KM, Heelan, L, Heintzelman, WJ, Heise, J, Helmer, RL, Hemingway, RJ, Hime, A, Howe, MA, Huang, M, Inrig, E, Jagam, P, Jelley, NA, Klein, JR, Kormos, LL, Kos, MS, Kruger, A, Kraus, C, Krauss, CB, Krumins, AV, Kutter, T, Kyba, CCM, Labranche, H, Lange, R, Law, J, Lawson, IT, Lesko, KT, Leslie, JR, Levine, I, Loach, JC, Luoma, S, MacLellan, R, Majerus, S, Maneira, J, Marino, AD, McCauley, N, McDonald, AB, McGee, S, Mifflin, C, Miknaitis, KKS, Nickel, BG, Noble, AJ, Norman, EB, Oblath, NS, Okada, CE, O'Keeffe, HM, Ollerhead, RW, Gann, GDO, Orrell, JL, Oser, SM, Ouvarova, T, Peeters, SJM, Poon, AWP, Pun, CSJ, Rielage, K, Robertson, BC, Robertson, RGH, Rollin, E, Rosendahl, SSE, Schwendener, MH, Seibert, SR, Simard, O, Simpson, JJ, Sims, CJ, Sinclair, D, Sinclair, L, Skensved, P, Smith, MWE, Stokstad, RG, Stonehill, LC, Tafirout, R, Takeuchi, Y, Tesic, G, Thomson, M, Tsang, KV, Tsui, T, Van Berg, R, Virtue, CJ, Wall, BL, Waller, D, Waltham, CE, Tseung, HWC, Wark, DL, Wendland, J, West, N, Wilkerson, JF, Wilson, JR, Wouters, JM, Yeh, M, Zuber, K, and Collaboration, SNO

Published
2005

22. Dark Matter Search Results from the PICO-60 C_{3}F_{8} Bubble Chamber.

Author

Amole C, Ardid M, Arnquist IJ, Asner DM, Baxter D, Behnke E, Bhattacharjee P, Borsodi H, Bou-Cabo M, Campion P, Cao G, Chen CJ, Chowdhury U, Clark K, Collar JI, Cooper PS, Crisler M, Crowder G, Dahl CE, Das M, Fallows S, Farine J, Felis I, Filgas R, Girard F, Giroux G, Hall J, Harris O, Hoppe EW, Jin M, Krauss CB, Laurin M, Lawson I, Leblanc A, Levine I, Lippincott WH, Mamedov F, Maurya D, Mitra P, Nania T, Neilson R, Noble AJ, Olson S, Ortega A, Plante A, Podviyanuk R, Priya S, Robinson AE, Roeder A, Rucinski R, Scallon O, Seth S, Sonnenschein A, Starinski N, Štekl I, Tardif F, Vázquez-Jáuregui E, Wells J, Wichoski U, Yan Y, Zacek V, and Zhang J

Abstract

New results are reported from the operation of the PICO-60 dark matter detector, a bubble chamber filled with 52 kg of C_{3}F_{8} located in the SNOLAB underground laboratory. As in previous PICO bubble chambers, PICO-60 C_{3}F_{8} exhibits excellent electron recoil and alpha decay rejection, and the observed multiple-scattering neutron rate indicates a single-scatter neutron background of less than one event per month. A blind analysis of an efficiency-corrected 1167-kg day exposure at a 3.3-keV thermodynamic threshold reveals no single-scattering nuclear recoil candidates, consistent with the predicted background. These results set the most stringent direct-detection constraint to date on the weakly interacting massive particle (WIMP)-proton spin-dependent cross section at 3.4×10^{-41}  cm^{2} for a 30-GeV c^{-2} WIMP, more than 1 order of magnitude improvement from previous PICO results.

Published
2017
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23. A precise method to determine the activity of a weak neutron source using a germanium detector.

Author

Duke MJ, Hallin AL, Krauss CB, Mekarski P, and Sibley L

Abstract

A standard high purity germanium (HPGe) detector was used to determine the previously unknown neutron activity of a weak americium-beryllium (AmBe) neutron source. γ rays were created through (27)Al(n,n'), (27)Al(n,γ) and (1)H(n,γ) reactions induced by the neutrons on aluminum and acrylic disks, respectively. These γ rays were measured using the HPGe detector. Given the unorthodox experimental arrangement, a Monte Carlo simulation was developed to model the efficiency of the detector system to determine the neutron activity from the measured γ rays. The activity of our neutron source was determined to be 307.4±5.0n/s and is consistent for the different neutron-induced γ rays., (Copyright © 2016 Elsevier Ltd. All rights reserved.)

Published
2016
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24. Dark Matter Search Results from the PICO-2L C3F8 Bubble Chamber.

Author

Amole C, Ardid M, Asner DM, Baxter D, Behnke E, Bhattacharjee P, Borsodi H, Bou-Cabo M, Brice SJ, Broemmelsiek D, Clark K, Collar JI, Cooper PS, Crisler M, Dahl CE, Daley S, Das M, Debris F, Dhungana N, Farine J, Felis I, Filgas R, Fines-Neuschild M, Girard F, Giroux G, Hai M, Hall J, Harris O, Jackson CM, Jin M, Krauss CB, Lafrenière M, Laurin M, Lawson I, Levine I, Lippincott WH, Mann E, Martin JP, Maurya D, Mitra P, Neilson R, Noble AJ, Plante A, Podviianiuk RB, Priya S, Robinson AE, Ruschman M, Scallon O, Seth S, Sonnenschein A, Starinski N, Štekl I, Vázquez-Jáuregui E, Wells J, Wichoski U, Zacek V, and Zhang J

Subjects
Acoustics instrumentation, Algorithms, Neutrons, Fluorocarbons chemistry, Models, Theoretical
Abstract

New data are reported from the operation of a 2 liter C3F8 bubble chamber in the SNOLAB underground laboratory, with a total exposure of 211.5 kg days at four different energy thresholds below 10 keV. These data show that C3F8 provides excellent electron-recoil and alpha rejection capabilities at very low thresholds. The chamber exhibits an electron-recoil sensitivity of <3.5×10(-10) and an alpha rejection factor of >98.2%. These data also include the first observation of a dependence of acoustic signal on alpha energy. Twelve single nuclear recoil event candidates were observed during the run. The candidate events exhibit timing characteristics that are not consistent with the hypothesis of a uniform time distribution, and no evidence for a dark matter signal is claimed. These data provide the most sensitive direct detection constraints on WIMP-proton spin-dependent scattering to date, with significant sensitivity at low WIMP masses for spin-independent WIMP-nucleon scattering.

Published
2015
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25. Independent measurement of the total active 8B solar neutrino flux using an array of 3He proportional counters at the Sudbury Neutrino Observatory.

Author

Aharmim B, Ahmed SN, Amsbaugh JF, Anthony AE, Banar J, Barros N, Beier EW, Bellerive A, Beltran B, Bergevin M, Biller SD, Boudjemline K, Boulay MG, Bowles TJ, Browne MC, Bullard TV, Burritt TH, Cai B, Chan YD, Chauhan D, Chen M, Cleveland BT, Cox-Mobrand GA, Currat CA, Dai X, Deng H, Detwiler J, DiMarco M, Doe PJ, Doucas G, Drouin PL, Duba CA, Duncan FA, Dunford M, Earle ED, Elliott SR, Evans HC, Ewan GT, Farine J, Fergani H, Fleurot F, Ford RJ, Formaggio JA, Fowler MM, Gagnon N, Germani JV, Goldschmidt A, Goon JT, Graham K, Guillian E, Habib S, Hahn RL, Hallin AL, Hallman ED, Hamian AA, Harper GC, Harvey PJ, Hazama R, Heeger KM, Heintzelman WJ, Heise J, Helmer RL, Henning R, Hime A, Howard C, Howe MA, Huang M, Jagam P, Jamieson B, Jelley NA, Keeter KJ, Klein JR, Kormos LL, Kos M, Krüger A, Kraus C, Krauss CB, Kutter T, Kyba CC, Lange R, Law J, Lawson IT, Lesko KT, Leslie JR, Loach JC, MacLellan R, Majerus S, Mak HB, Maneira J, Martin R, McBryde K, McCauley N, McDonald AB, McGee S, Mifflin C, Miller GG, Miller ML, Monreal B, Monroe J, Morissette B, Myers A, Nickel BG, Noble AJ, Oblath NS, O'Keeffe HM, Ollerhead RW, Gann GD, Oser SM, Ott RA, Peeters SJ, Poon AW, Prior G, Reitzner SD, Rielage K, Robertson BC, Robertson RG, Rollin E, Schwendener MH, Secrest JA, Seibert SR, Simard O, Simpson JJ, Sinclair L, Skensved P, Smith MW, Steiger TD, Stonehill LC, Tesić G, Thornewell PM, Tolich N, Tsui T, Tunnell CD, Van Wechel T, Van Berg R, VanDevender BA, Virtue CJ, Walker TJ, Wall BL, Waller D, Tseung HW, Wendland J, West N, Wilhelmy JB, Wilkerson JF, Wilson JR, Wouters JM, Wright A, Yeh M, Zhang F, and Zuber K

Abstract

The Sudbury Neutrino Observatory (SNO) used an array of 3He proportional counters to measure the rate of neutral-current interactions in heavy water and precisely determined the total active (nu&#95;x) 8B solar neutrino flux. This technique is independent of previous methods employed by SNO. The total flux is found to be 5.54&#95;-0.31;+0.33(stat)-0.34+0.36(syst)x10(6) cm(-2) s(-1), in agreement with previous measurements and standard solar models. A global analysis of solar and reactor neutrino results yields Deltam2=7.59&#95;-0.21;+0.19x10(-5) eV2 and theta=34.4&#95;-1.2;+1.3 degrees. The uncertainty on the mixing angle has been reduced from SNO's previous results.

Published
2008
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