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

Author

Aharmim, B., Ahmed, S. N., Anthony, A. E., Barros, N., Beier, E. W., Bellerive, A., Beltran, B., Bergevin, M., Biller, S. D., Blucher, E., 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., Kraus, C., Krauss, C. B., Krüger, A., Kutter, T., Kyba, C. C. M., Labe, K., Land, B. J., Lange, R., LaTorre, A., 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., Skensved, P., Sonley, T. J., Stonehill, L. C., Tešić, 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., and Zuber, K.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

A search has been performed for neutrinos from two sources, the $hep$ reaction in the solar $pp$ fusion chain and the $\nu_e$ component of the diffuse supernova neutrino background (DSNB), using the full dataset of the Sudbury Neutrino Observatory with a total exposure of 2.47 kton-years after fiducialization. The $hep$ search is performed using both a single-bin counting analysis and a likelihood fit. We find a best-fit flux that is compatible with solar model predictions while remaining consistent with zero flux, and set a one-sided upper limit of $\Phi_{hep} < 30\times10^{3}~\mathrm{cm}^{-2}~\mathrm{s}^{-1}$ [90% credible interval (CI)]. No events are observed in the DSNB search region, and we set an improved upper bound on the $\nu_e$ component of the DSNB flux of $\Phi^\mathrm{DSNB}_{\nu_e} < 19~\textrm{cm}^{-2}~\textrm{s}^{-1}$ (90% CI) in the energy range $22.9 < E_\nu < 36.9$~MeV., Comment: 11 pages, 6 figures

Published
2020
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2. Cosmogenic Neutron Production at the Sudbury Neutrino Observatory

Author

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., Curley, R., 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., Kéfélian, C., Keeter, K. J., Klein, J. R., Kormos, L. L., Kos, M., Kr\u, 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., Skensved, P., Sonley, T. J., Stonehill, L. C., Teš, 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., and Zuber, K.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
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 $10^{-4}\;\text{cm}^{2}/\left(\text{g}\cdot\mu\right)$, is measured to be $7.28 \pm 0.09\;\text{stat.} ^{+1.59}_{-1.12}\;\text{syst.}$ in pure heavy water and $7.30 \pm 0.07\;\text{stat.} ^{+1.40}_{-1.02}\;\text{syst.}$ in NaCl-loaded heavy water. These results provide unique insights into this potential background source for experiments at SNOLAB.

Published
2019
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3. Measurement of neutron production in atmospheric neutrino interactions at the Sudbury Neutrino Observatory

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., and Zuber, K.

Subjects
High Energy Physics - Experiment
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
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4. 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

5. Constraints on Neutrino Lifetime from the Sudbury Neutrino Observatory

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., Kéfélian, C., Keeter, K. J., Klein, J. R., Kormos, L. L., Kos, M., Krüger, 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., Skensved, P., Sonley, T. J., Stonehill, L. C., Tešić, 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., and Zuber, K.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

The long baseline between the 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 $^8$B solar neutrino data taken by the Sudbury Neutrino Observatory. This fit constrains the lifetime of neutrino mass state $\nu_2$ to be ${>8.08\times10^{-5}}$ 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 $\nu_2$ of ${>1.04\times10^{-3}}$ s/eV at $99\%$ confidence.

Published
2018
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6. 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

7. Tests of Lorentz invariance at the Sudbury Neutrino Observatory

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., Blucher, E., 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., Kefelian, C., Keeter, K. J., Klein, J. R., Kormos, L. L., Kos, M., Kruger, A., Kraus, C., Krauss, C. B., Kutter, T., Kyba, C. C. M., Labe, K., Land, B. J., Lange, R., LaTorre, A., 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., Skensved, P., 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., Winchester, T., Wilson, J. R., Wright, A., Yeh, M., Zhang, F., and Zuber, K.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
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 40 limits on perviously unconstrained operators and improved limits on 15 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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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. 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

11. The search for neutron-antineutron oscillations at the Sudbury Neutrino Observatory

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., Boudjemline, K., Boulay, M. G., Cai, B., Chan, Y. D., Chauhan, D., Chen, M., Cleveland, B. T., Cox, G. A., Dai, X., Deng, H., Detwiler, J. A., Doe, P. J., Doucas, G., Drouin, P. -L., Duncan, F. A., Dunford, M., Earle, E. D., Elliott, S. R., Evans, H. C., Ewan, G. T., Farine, J., Fergani, H., Fleurot, F., Ford, R. J., Formaggio, J. A., Gagnon, N., 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., 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., 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., OrebiGann, G. D., 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., Simpson, J. J., Sinclair, D., Skensved, P., 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., Wright, A., Yeh, M., Zhang, F., and Zuber, K.

Subjects
High Energy Physics - Experiment, Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

Tests on $B-L$ symmetry breaking models are important probes to search for new physics. One proposed model with $\Delta(B-L)=2$ 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 was concentrated in oscillations occurring within the deuteron, and 23 events are observed against a background expectation of 30.5 events. These translate to a lower limit on the nuclear lifetime of $1.48\times 10^{31}$ years at 90% confidence level (CL) when no restriction is placed on the signal likelihood space (unbounded). Alternatively, a lower limit on the nuclear lifetime was found to be $1.18\times 10^{31}$ years at 90% CL 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., Comment: 14 pages, 8 figures

Published
2017
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12. 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

13. A Search for Astrophysical Burst Signals at the Sudbury Neutrino Observatory

Author

Aharmim, B., Ahmed, S. N., Anthony, A. E., Barros, N., Beier, E. W., Bellerive, A., Beltran, B., Bergevin, M., Biller, S. D., Boudjemline, K., Boulay, M. G., Cai, B., Chan, Y. D., Chauhan, D., Chen, M., Cleveland, B. T., Cox, G. A., Dai, X., Deng, H., Detwiler, J. A., DiMarco, M., Diamond, M. D., Doe, P. J., Doucas, G., Drouin, P. -L., Duncan, F. A., Dunford, M., Earle, E. D., Elliott, S. R., Evans, H. C., Ewan, G. T., Farine, J., Fergani, H., Fleurot, F., Ford, R. J., Formaggio, J. A., Gagnon, N., 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., Kraus, C., Krauss, C. B., Krueger, A., Kutter, T., Kyba, C. C. M., 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., 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., 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., Simpson, J. J., Sinclair, D., Skensved, P., 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., Watson, P. J. S., Wendland, J., West, N., Wilkerson, J. F., Wilson, J. R., Wouters, J. M., Wright, A., Yeh, M., Zhang, F., and Zuber, K.

Subjects
Astrophysics - Solar and Stellar Astrophysics, Nuclear Experiment
Abstract

The Sudbury Neutrino Observatory (SNO) has confirmed the standard solar model and neutrino oscillations through the observation of neutrinos from the solar core. In this paper we present a search for neutrinos associated with sources other than the solar core, such as gamma-ray bursters and solar flares. We present a new method for looking for temporal coincidences between neutrino events and astrophysical bursts of widely varying intensity. No correlations were found between neutrinos detected in SNO and such astrophysical sources.

Published
2013
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14. Combined Analysis of all Three Phases of Solar Neutrino Data from the Sudbury Neutrino Observatory

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., Boudjemline, K., Boulay, M. G., Cai, B., Chan, Y. D., Chauhan, D., Chen, M., Cleveland, B. T., Cox, G. A., Dai, X., Deng, H., Detwiler, J. A., DiMarco, M., Doe, P. J., Doucas, G., Drouin, P. -L., Duncan, F. A., Dunford, M., Earle, E. D., Elliott, S. R., Evans, H. C., Ewan, G. T., Farine, J., Fergani, H., Fleurot, F., Ford, R. J., Formaggio, J. A., Gagnon, N., 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., Kraus, C., Krauss, C. B., Kruger, A, Kutter, T., Kyba, C. C. M., Lange, R., Law, J., Lawson, I. T., Lesko, K. T., Leslie, J. R., Loach, J. C., MacLellan, R., Majerus, S., Mak, H. B., Maneira, J., Martin, R., 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., 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., Rosten, R. C., Schwendener, M. H., Secrest, J. A., Seibert, S. R., Simard, O., Simpson, J. J., Skensved, P., Sonley, T. J., Stonehill, L. C., Tešić, G., Tolich, N., Tsui, T., Van Berg, R., VanDevender, B. A., Virtue, C. J., Tseung, H. Wan Chan, Wark, D. L., Watson, P. J. S., Wendland, J., West, N., Wilkerson, J. F., Wilson, J. R., Wouters, J. M., Wright, A., Yeh, M., Zhang, F., and Zuber, K.

Subjects
Nuclear Experiment, Astrophysics - Solar and Stellar Astrophysics, High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

We report results from a combined analysis of solar neutrino data from all phases of the Sudbury Neutrino Observatory. By exploiting particle identification information obtained from the proportional counters installed during the third phase, this analysis improved background rejection in that phase of the experiment. The combined analysis resulted in a total flux of active neutrino flavors from 8B decays in the Sun of (5.25 \pm 0.16(stat.)+0.11-0.13(syst.))\times10^6 cm^{-2}s^{-1}. A two-flavor neutrino oscillation analysis yielded \Deltam^2_{21} = (5.6^{+1.9}_{-1.4})\times10^{-5} eV^2 and tan^2{\theta}_{12}= 0.427^{+0.033}_{-0.029}. A three-flavor neutrino oscillation analysis combining this result with results of all other solar neutrino experiments and the KamLAND experiment yielded \Deltam^2_{21} = (7.41^{+0.21}_{-0.19})\times10^{-5} eV^2, tan^2{\theta}_{12} = 0.446^{+0.030}_{-0.029}, and sin^2{\theta}_{13} = (2.5^{+1.8}_{-1.5})\times10^{-2}. This implied an upper bound of sin^2{\theta}_{13} < 0.053 at the 95% confidence level (C.L.).

Published
2011
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15. Measurement of the $\nu_e$ and Total $^{8}$B Solar Neutrino Fluxes with the Sudbury Neutrino Observatory Phase-III Data Set

Author

Aharmim, B., Ahmed, S. N., Amsbaugh, J. F., Anaya, J. M., Anthony, A. E., Banar, J., Barros, N., Beier, E. W., Bellerive, A., Beltran, B., Bergevin, M., Biller, S. D., Boudjemline, K., Boulay, M. G., Bowles, T. J., Browne, M. C., Bullard, T. V., Burritt, T. H., Cai, B., Chan, Y. D., Chauhan, D., Chen, M., Cleveland, B. T., Cox, G. A., Currat, C. A., Dai, X., Deng, H., Detwiler, J. A., DiMarco, M., Doe, P. J., Doucas, G., Dragowsky, M. R., Drouin, P. -L., Duba, C. A., Duncan, F. A., Dunford, M., Earle, E. D., Elliott, S. R., Evans, H. C., Ewan, G. T., Farine, J., Fergani, H., Fleurot, F., Ford, R. J., Formaggio, J. A., Fowler, M. M., Gagnon, N., Germani, J. V., Goldschmidt, A., Goon, J. TM., Graham, K., Guillian, E., Habib, S., Hahn, R. L., Hallin, A. L., Hallman, E. D., Hamian, A. A., Harper, G. C., Harvey, P. J., Hazama, R., Heeger, K. M., Heintzelman, W. J., Heise, J., Helmer, R. L., Henning, R., Hime, A., Howard, C., Howe, M. A., Huang, M., Jagam, P., Jamieson, B., Jelley, N. A., Keeter, K. J., Klein, J. R., Kormos, L. L., Kos, M., Krueger, A., Kraus, C., Krauss, C. B., Kutter, T., Kyba, C. C. M., Lange, R., Law, J., Lawson, I. T., Lesko, K. T., Leslie, J. R., Loach, J. C., MacLellan, R., Majerus, S., Mak, H. B., Maneira, J., Martin, R., McCauley, N., McDonald, A. B., McGee, S. R., Mifflin, C., Miller, G. G., Miller, M. L., Monreal, B., Monroe, J., Morissette, B., Myers, A. W., Nickel, B. G., Noble, A. J., O'Keeffe, H. M., Oblath, N. S., 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., Rollin, E., Schwendener, M. H., Secrest, J. A., Seibert, S. R., Simard, O., Simpson, J. J., Skensved, P., Smith, M. W. E., Sonley, T. J., Steiger, T. D., Stonehill, L. C., Tesic, G., Thornewell, P. M., Tolich, N., Tsui, T., Tunnell, C. D., Van Wechel, T., Van Berg, R., VanDevender, B. A., Virtue, C. J., Wall, B. L., Waller, D., Tseung, H. Wan Chan, Wendland, J., West, N., Wilhelmy, J. B., Wilkerson, J. F., Wilson, J. R., Wouters, J. M., Wright, A., Yeh, M., Zhang, F., and Zuber, K.

Subjects
Nuclear Experiment, Astrophysics - Solar and Stellar Astrophysics, High Energy Physics - Experiment
Abstract

This paper details the solar neutrino analysis of the 385.17-day Phase-III data set acquired by the Sudbury Neutrino Observatory (SNO). An array of $^3$He proportional counters was installed in the heavy-water target to measure precisely the rate of neutrino-deuteron neutral-current interactions. This technique to determine the total active $^8$B solar neutrino flux was largely independent of the methods employed in previous phases. The total flux of active neutrinos was measured to be $5.54^{+0.33}_{-0.31}(stat.)^{+0.36}_{-0.34}(syst.)\times 10^{6}$ cm$^{-2}$ s$^{-1}$, consistent with previous measurements and standard solar models. A global analysis of solar and reactor neutrino mixing parameters yielded the best-fit values of $\Delta m^2 = 7.59^{+0.19}_{-0.21}\times 10^{-5}{eV}^2$ and $\theta = 34.4^{+1.3}_{-1.2}$ degrees., Comment: 104 pages, 26 figures, 20 tables, submitted to Phys. Rev. C

Published
2011
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16. The astrophysical rate of 15O(alpha,gamma)19Ne via the (p,t) reaction in inverse kinematics

Author

Davids, B., Berg, A. M. van den, Dendooven, P., Fleurot, F., Hernanz, M., Hunyadi, M., de Huu, M. A., Jose, J., Rehm, K. E., Segel, R. E., Siemssen, R. H., Wilschut, H. W., Wortche, H. J., and Wuosmaa, A. H.

Subjects
Nuclear Experiment, Astrophysics, Nuclear Theory
Abstract

A recoil coincidence technique has been applied to measure the alpha-decay branching ratios of near-threshold states in 19Ne. Populating these states using the (p,t) reaction in inverse kinematics, we detected the recoils and their decay products with 100% geometric efficiency using a magnetic spectrometer. Combining our branching ratio measurements with independent determinations of the radiative widths of these states, we calculate the astrophysical rate of 15O(alpha,gamma)19Ne. Using this reaction rate, we perform hydrodynamic calculations of nova outbursts and conclude that no significant breakout from the hot CNO cycles into the rp process occurs in novae via 15O(alpha,gamma)19Ne., Comment: submitted to PRC

Published
2003
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17. Alpha-decay branching ratios of near-threshold states in 19Ne and the astrophysical rate of 15O(alpha,gamma)19Ne

Author

Davids, B., Berg, A. M. van den, Dendooven, P., Fleurot, F., Hunyadi, M., de Huu, M. A., Rehm, K. E., Segel, R. E., Siemssen, R. H., Wilschut, H. W., Woertche, H. J., and Wuosmaa, A. H.

Subjects
Nuclear Experiment, Astrophysics, Nuclear Theory
Abstract

The 15O(alpha,gamma)19Ne reaction is one of two routes for breakout from the hot CNO cycles into the rp process in accreting neutron stars. Its astrophysical rate depends critically on the decay properties of excited states in 19Ne lying just above the 15O + alpha threshold. We have measured the alpha-decay branching ratios for these states using the p(21Ne,t)19Ne reaction at 43 MeV/u. Combining our measurements with previous determinations of the radiative widths of these states, we conclude that no significant breakout from the hot CNO cycle into the rp process in novae is possible via 15O(alpha,gamma)19Ne, assuming current models accurately represent their temperature and density conditions.

Published
2002
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18. Measurement of the nue and Total 8B Solar Neutrino Fluxes with the Sudbury Neutrino Observatory Phase I Data Set

Author

Aharmim, B., Ahmad, Q.R., Ahmed, S.N., Allen, R.C., Andersen, T.C., Anglin, J.D., Buehler, G., Barton, J.C., Beier, E.W., Bercovitch, M., Bergevin, M., Bigu, J., Biller, S.D., Black, R.A., Blevis, I., Boardman, R.J., Boger, J., Bonvin, E., Boulay, M.G., Bowler, M.G., Bowles, T.J., Brice, S.J., Browne, M.C., Bullard, T.V., Burritt, T.H., Cameron, J., Chan, Y.D., Chen, H.H., Chen, M., Chen, X., Cleveland, B.T., Cowan, J.H.M., Cowen, D.F., Cox, G.A., Currat, C.A., Dai, X., Dalnoki-Veress, F., Davidson, W.F., Deng, H., DiMarco, M., Doe, P.J., Doucas, G., Dragowsky, M.R., Duba, C.A., Duncan, F.A., Dunford, M., Dunmore, J.A., Earle, E.D., Elliott, S.R., Evans, H.C., Ewan, G.T., Farine, J., Fergani, H., Ferraris, A.P., Fleurot, F., Ford, R.J., Formaggio, J.A., Fowler, M.M., Frame, K., Frank, E.D., Frati, W., Gagnon, N., Germani, J.V., Gil, S., Goldschmidt, A., Goon, J.T.M., Graham, K., Grant, D.R., Guillian, E., Hahn, R.L., Hallin, A.L., Hallman, E.D., Hamer, A.S., Hamian, A.A., Handler, W.B., Haq, R.U., Hargrove, C.K., Harvey, P.J., Hazama, R., Heeger, K.M., Heintzelman, W.J., Heise, J., Helmer, R.L., Henning, R., Hepburn, J.D., Heron, H., Hewett, J., Hime, A., Howard, C., Howe, M.A., Huang, M., Hykawy, J.G., Isaac, M.C.P., Jagam, P., Jamieson, B., Jelley, N.A., Jillings, C., Jonkmans, G., Kazkaz, K., and Keener, P.T.

Abstract

This article provides the complete description of results from the Phase I data set of the Sudbury Neutrino Observatory (SNO). The Phase I data set is based on a 0.65 kt-year exposure of heavy water to the solar 8B neutrino flux. Included here are details of the SNO physics and detector model, evaluations of systematic uncertainties, and estimates of backgrounds. Also discussed are SNO's approach to statistical extraction of the signals from the three neutrino reactions (charged current, neutral current, and elastic scattering) and the results of a search for a day-night asymmetry in the ?e flux. Under the assumption that the 8B spectrum is undistorted, the measurements from this phase yield a solar ?e flux of ?(?e) = 1.76+0.05?0.05(stat.)+0.09?0.09 (syst.) x 106 cm?2 s?1, and a non-?e component ?(? mu) = 3.41+0.45?0.45(stat.)+0.48?0.45 (syst.) x 106 cm?2 s?1. The sum of these components provides a total flux in excellent agreement with the predictions of Standard Solar Models. The day-night asymmetry in the ?e flux is found to be Ae = 7.0 +- 4.9 (stat.)+1.3?1.2 percent (sys.), when the asymmetry in the total flux is constrained to be zero.

Published
2007

19. A Search for Neutrinos from the Solar hep Reaction and the Diffuse Supernova Neutrino Background with the Sudbury Neutrino Observatory

Author

Aharmim, B., Ahmed, S.N., Anthony, A.E., Beier, E.W., Bellerive, A., Bergevin, M., Biller, S.D., Boulay, M.G., Chan, Y.D., Chen, M., Chen, X., Cleveland, B.T., Cox, G.A., Currat, C.A., Dai, X., Dalnoki-Veress, F., Deng, H., Detwiler, J., DiMarco, M., Doe, P.J., Doucas, G., Drouin, P.-L., Duncan, F.A., Dunford, M., Dunmore, J.A., Earle, E.D., Evans, H.C., Ewan, G.T., Farine, J., Fergani, H., Fleurot, F., Ford, R.J., Formaggio, J.A., Gagnon, N., Goon, J.T.M., Graham, K., Guillian, E., Hahn, R.L., Hallin, A.L., Hallman, E.D., Harvey, P.J., Hazama, R., Heeger, K.M., Heintzelman, W.J., Heise, J., Helmer, R.L., Hemingway, R.J., Henning, R., Hime, A., Howard, C., Howe, M.A., Huang, M., Jagam, P., Jelley, N.A., Klein, J.R., Kormos, L.L., Kos, M., Krueger, A., Kraus, C., Krauss, C.B., Kutter, T., Kyba, C.C.M., Labranche, H., Lange, R., Law, J.Lawson.I.T., Lesko, K.T., Leslie, J.R., Loach, J.C., Luoma, S., MacLellan, R., Majerus, S., Mak, H.B., Maneira, J., Marino, A.D., Martin, R., McCauley, N., McDonald, A.B., McGee, S., Mifflin, C., Miknaitis, K.K.S., Miller, M.L., Monreal, B., Nickel, B.G., Noble, A.J., Norman, E.B., Oblath, N.S., Okada, C.E., O'Keeffe, H.M., Orebi Gann, G.D., Oser, S.M., Ott, R., Peeters, S.J.M., Poon, A.W.P., Prior, G., Rielage, K., Robertson, B.C., Robertson, R.G.H., Rollin, E., Schwendener, M.H., and Secrest, J.A.

Abstract

A search has been made for neutrinos from the hep reaction in the Sun and from the diffuse supernova neutrino background (DSNB) using data collected during the first operational phase of the Sudbury Neutrino Observatory, with an exposure of 0.65 kilotonne-years. For the hep neutrino search, two events are observed in the effective electron energy range of 14.3 MeV < Teff < 20 MeV where 3.1 background events are expected. After accounting for neutrino oscillations, an upper limit of 2.3 x 104 cm-2s-1 at the 90 percent confidence level is inferred on the integral total flux of hep neutrinos. For DSNB neutrinos, no events are observed in the effective electron energy range of 21 MeV < Teff < 35 MeV and, consequently, an upper limit on the nu e component of the DSNB fluxin the neutrino energy range of 22.9 MeV < E nu < 36.9 MeV of 70 cm-2-1 is inferred at the 90 percent confidence level. This is an improvement by a factor of 6.5 on the previous best upper limit on the hep neutrino flux and by two orders of magnitude on the previous upper limit on the nu e component of the DSNB flux.

Published
2006

20. Electron energy spectra, fluxes, and day-night asymmetries of boron-8 solar neutrinos from the 391-day salt phase sno data set

Author

Aharmim, B., Ahmed, S.N., Anthony, A.E., Beier, E.W., Bellerive, A., Bergevin, M., Biller, S.D., Boger, J., Boulay, M.G., Bowler, M.G., Bullard, T.V., Chan, Y.D., Chen, M., Chen, X., Cleveland, B.T., Cox, G.A., Currat, C.A., Dai, X., Dalnoki-Veress, F., Deng, H., Doe, P.J., Dosanjh, R.S., Doucas, G., Duba, C.A., Duncan, F.A., Dunford, M., Dunmore, J.A., Earle, E.D., Elliott, S.R., Evans, H.C., Ewan, G.T., Farine, J., Fergani, H., Fleurot, F., Formaggio, J.A., Frame, K., Frati, W., Fulsom, B.G., Gagnon, N., Graham, K., Grant, D.R., Hahn, R.L., Hall, J.C., Hallin, A.L., Hallman, E.D., Handler, W.B., Hargrove, C.K., Harvey, P.J., Hazama, R., Heeger, K.M., Heelan, L., Heintzelman, W.J., Heise, J., Helmer, R.L., Hemingway, R.J., Hime, A., Howard, C., Howe, M.A., Huang, M., Jagam, P., Jelley, N.A., Klein, J.R., Kormos, L.L., Kos, M.S., Kruger, A., Kraus, C., Krauss, C.B., Krumins, A.V., Kutter, T., Kyba, C.C.M., Labranche, H., Lange, R., Law, J., Lawson, I.T., Lesko, K.T., Leslie, J.R., Levine, I., Loach, J.C., Luoma, S., MacLellan, R., Majerus, S., Mak, H.B., Maneira, J., Marino, A.D., McCauley, N., McDonald, A.B., McGee, S., McGregor, G., Mifflin, C., Miknaitis, K.K.S., Moffat, B.A., Nally, C.W., Neubauer, M.S., Nickel, B.G., Noble, A.J., Norman, E.B., Oblath, N.S., Okada, C.E., Ollerhead, R.W., and Orrell, J.L.

Subjects
neutrinos, solar neutrinos
Abstract

Results are reported from the complete salt phase of the Sudbury Neutrino Observatory experiment in which NaCl was dissolved in the D_2O target. The addition of salt enhanced the signal from neutron capture, as compared to the pure D_2O 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 106 cm-2 s-1, the total flux of active-flavor neutrinos from 8B decay in the Sun is found to be 4.94+0.21_-0.21(stat)+0.38_-0.34(syst) and the integral flux of electron neutrinos for an undistorted 8B spectrum is 1.68+0.06_-0.06(stat)+0.08_-0.09(syst); the signal from (nu_x,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 Delta m2 = (8.0+0.6_-0.4) x 10-5 eV2 and theta = 33.9 +2.4_-2.2 degrees.

Published
2005

21. A search for astrophysical burst signals at the Sudbury Neutrino Observatory

Author

Aharmim, B., Ahmed, S.N., Anthony, A.E., Barros, N., Beier, E.W., Bellerive, A., Beltran, B., Bergevin, M., Biller, S.D., Boudjemline, K., Boulay, M.G., Cai, B., Chan, Y.D., Chauhan, D., Chen, M., Cleveland, B.T., Cox, G.A., Dai, X., Deng, H., Detwiler, J.A., DiMarco, M., Diamond, M.D., Doe, P.J., Doucas, G., Drouin, P.-L., Duncan, F.A., Dunford, M., Earle, E.D., Elliott, S.R., Evans, H.C., Ewan, G.T., Farine, J., Fergani, H., Fleurot, F., Ford, R.J., Formaggio, J.A., Gagnon, N., 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., Kraus, C., Krauss, C.B., Krueger, A., Kutter, T., Kyba, C.C.M., 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., 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., Ollerhead, R.W., Orebi Gann, G.D., 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., Simpson, J.J., Sinclair, D., Skensved, P., Sonley, T.J., Stonehill, L.C., Tešić, G., Tolich, N., Tsui, T., Van Berg, R., VanDevender, B.A., Virtue, C.J., Wall, B.L., Waller, D., Wan Chan Tseung, H., Wark, D.L., Watson, P.J.S., Wendland, J., West, N., Wilkerson, J.F., Wilson, J.R., Wouters, J.M., Wright, A., Yeh, M., Zhang, F., and Zuber, K.

Published
2014
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22. Measurement of neutron production in atmospheric neutrino interactions at the Sudbury Neutrino Observatory

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., and Zuber, K.

Subjects
Heavy water, Physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, FOS: Physical sciences, 01 natural sciences, Visible energy, High Energy Physics - Experiment, Nuclear physics, chemistry.chemical_compound, High Energy Physics - Experiment (hep-ex), chemistry, 0103 physical sciences, High Energy Physics::Experiment, ddc:530, Neutron, Production (computer science), Atmospheric neutrino, Neutrino, 010306 general physics, Nuclear Experiment, QC
Abstract

Author(s): Aharmim, B; Ahmed, SN; Anthony, AE; Barros, N; Beier, EW; Bellerive, A; Beltran, B; Bergevin, M; Biller, SD; Bonventre, R; Boudjemline, K; Boulay, MG; Cai, B; Callaghan, EJ; Caravaca, J; Chan, YD; Chauhan, D; Chen, M; Cleveland, BT; Cox, GA; Dai, X; Deng, H; Descamps, FB; Detwiler, JA; Doe, PJ; Doucas, G; Drouin, P-L; Dunford, M; Elliott, SR; Evans, HC; Ewan, GT; Farine, J; Fergani, H; Fleurot, F; Ford, RJ; Formaggio, JA; Gagnon, N; Gilje, K; Goon, JTM; Graham, K; Guillian, E; Habib, S; Hahn, RL; Hallin, AL; Hallman, ED; Harvey, PJ; Hazama, R; Heintzelman, WJ; Heise, J; Helmer, RL; Hime, A; Howard, C; Huang, M; Jagam, P; Jamieson, B; Jelley, NA; Jerkins, M; Keeter, KJ; Klein, JR; Kormos, LL; Kos, M; Kruger, A; Kraus, C; Krauss, CB; Kutter, T; Kyba, CCM; Land, BJ; Lange, R; Law, J; Lawson, IT; Lesko, KT; Leslie, JR; Levine, I; Loach, JC; MacLellan, R; Majerus, S; Mak, HB; Maneira, J; Martin, RD; Mastbaum, A; McCauley, N; McDonald, AB; McGee, SR; Miller, ML; Monreal, B | 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
2020

23. Cosmogenic neutron production at the Sudbury Neutrino Observatory

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., Curley, R., 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. T. M., 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., Kéfélian, C., Keeter, K. J., Klein, J. R., Kormos, L. L., Kos, M., Krüger, 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., Orebi Gann, G. D., 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., Skensved, P., Sonley, T. J., Stonehill, L. C., Tešić, G., Tolich, N., Tsui, T., Van Berg, R., VanDevender, B. A., Virtue, C. J., Wall, B. L., Waller, D., Wan Chan Tseung, H., Wark, D. L., Wendland, J., West, N., Wilkerson, J. F., Wilson, J. R., Winchester, T., Wright, A., Yeh, M., Zhang, F., and Zuber, K.

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Extrapolation, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), chemistry.chemical_compound, Neutron yield, Observatory, 0103 physical sciences, ddc:530, Neutron, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, QC, Heavy water, Physics, Sudbury Neutrino Observatory, Muon, 010308 nuclear & particles physics, Observable, chemistry, High Energy Physics::Experiment
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

25. E1 and E2 capture cross section and astrophysical reaction rate of the key reaction 12C( α, γ) 16O

Author

Hammer, J.W., Fey, M., Kunz, R., Kiener, J., Tatischeff, V., Haas, F., Weil, J.L., Assunção, M., Beck, C., Boukari-Pelissie, C., Coc, A., Correia, J.J., Courtin, S., Fleurot, F., Galanopoulos, E., Grama, C., Hammache, F., Harissopulos, S., Korichi, A., Krmpotić, E., Le Du, D., Lopez-Martens, A., Malcherek, D., Meunier, R., Papka, P., Paradellis, T., Rousseau, M., Rowley, N., Staudt, G., and Szilner, S.

Published
2005
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26. New determination of the 12C( α, γ) 16O reaction rate from γ-ray angular distribution measurements

Author

Hammer, J.W., Fey, M., Kunz, R., Kiener, J., Tatischeff, V., Haas, F., Weil, J.L., Assunção, M., Beck, C., Boukari-Pelissie, C., Coc, A., Correia, J.J., Courtin, S., Fleurot, F., Galanopoulos, E., Grama, C., Hammache, F., Harissopulos, S., Korichi, A., Krmpotić, E., Le Du, D., Lopez-Martens, A., Malcherek, D., Meunier, R., Papka, P., Paradellis, T., Rousseau, M., Rowley, N., Staudt, G., and Szilner, S.

Published
2005
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27. Tests of Lorentz invariance at the Sudbury Neutrino Observatory

Author

Aharmim, B. (B.), Ahmed, S.N. (S. N.), Anthony, A.E. (A. E.), Barros, N. (N.), Beier, E.W. (E. W.), Bellerive, A. (Alain), Beltran, B. (B.), Bergevin, M. (M.), Biller, S.D. (S. D.), Blucher, E. (E.), Bonventre, R. (R.), Boudjemline, K. (K.), Boulay, M.G. (Mark Guy), Cai, B. (B.), Callaghan, E.J. (E. J.), Caravaca, J. (J.), Chan, Y.D. (Y. D.), Chauhan, D. (D.), Chen, M. (M.), Cleveland, B.T. (B. T.), Cox, G.A. (G. A.), Dai, X. (X.), Deng, H. (H.), Descamps, F.B. (F. B.), Detwiler, J.A. (J. A.), Doe, P.J. (P. J.), Doucas, G. (G.), Drouin, P.-L. (P. L.), Dunford, M. (M.), Elliott, S.R. (S. R.), Evans, H.C. (H. C.), Ewan, G.T. (G. T.), Farine, J. (J.), Fergani, H. (H.), Fleurot, F. (F.), Ford, R.J. (R. J.), Formaggio, J.A. (J. A.), Gagnon, N. (N.), Gilje, K. (K.), Goon, J.T. (J. Tm.), Graham, K. (K.), Guillian, E. (E.), Habib, S. (S.), Hahn, R.L. (R. L.), Hallin, A.L. (A. L.), Hallman, E.D. (E. D.), Harvey, P.J. (P. J.), Hazama, R. (R.), Heintzelman, W.J. (W. J.), Heise, J. (J.), Helmer, R.L. (R. L.), Hime, A. (A.), Howard, C. (C.), Huang, M. (M.), Jagam, P. (P.), Jamieson, B. (B.), Jelley, N.A. (N. A.), Jerkins, M. (M.), Kéfélian, C. (C.), Keeter, K.J. (K. J.), Klein, J.R. (J. R.), Kormos, L.L. (L. L.), Kos, M. (M.), Krüger, A. (A.), Kraus, C. (C.), Krauss, C.B. (C. B.), Kutter, T. (T.), Kyba, C.C.M. (C. C.M.), Labe, K. (K.), Land, B.J. (B. J.), Lange, R. (R.), Latorre, A. (A.), Law, J. (J.), Lawson, I.T. (I. T.), Lesko, K.T. (K. T.), Leslie, J.R. (J. R.), Levine, I. (I.), Loach, J.C. (J. C.), Maclellan, R. (R.), Majerus, S. (S.), Mak, H.B. (H. B.), Maneira, J. (J.), Martin, R.D. (R. D.), Mastbaum, A. (A.), McCauley, N. (N.), McDonald, A.B. (A. B.), McGee, S.R. (S. R.), Miller, M.L. (M. L.), Monreal, B. (B.), Monroe, J. (J.), Nickel, B.G. (B. G.), Noble, A.J. (A. J.), O'Keeffe, H.M. (H. M.), Oblath, N.S. (N. S.), Okada, C.E. (C. E.), Ollerhead, R.W. (R. W.), Orebi Gann, G.D. (G. D.), Oser, S.M. (S. M.), Ott, R.A. (R. A.), Peeters, S.J.M. (S. J.M.), Poon, A.W.P. (A. W.P.), Prior, G. (G.), Reitzner, S.D. (S. D.), Rielage, K. (K.), Robertson, B.C. (B. C.), Robertson, R.G.H. (R. G.H.), Schwendener, M.H. (M. H.), Secrest, J.A. (J. A.), Seibert, S.R. (S. R.), Simard, O. (O.), Sinclair, D. (D.), Skensved, P. (P.), Sonley, T.J. (T. J.), Stonehill, L.C. (L. C.), Tešić, G. (G.), Tolich, N. (N.), Tsui, T. (T.), Van Berg, R. (R.), Vandevender, B.A. (B. A.), Virtue, C.J. (C. J.), Wall, B.L. (B. L.), Waller, D. (D.), Wan Chan Tseung, H. (H.), Wark, D.L. (D. L.), Wendland, J. (J.), West, N. (N.), Wilkerson, J.F. (J. F.), Winchester, T. (T.), Wilson, J.R. (J. R.), Wright, A. (A.), Yeh, M. (M.), Zhang, F. (F.), Zuber, K. (K.), Aharmim, B. (B.), Ahmed, S.N. (S. N.), Anthony, A.E. (A. E.), Barros, N. (N.), Beier, E.W. (E. W.), Bellerive, A. (Alain), Beltran, B. (B.), Bergevin, M. (M.), Biller, S.D. (S. D.), Blucher, E. (E.), Bonventre, R. (R.), Boudjemline, K. (K.), Boulay, M.G. (Mark Guy), Cai, B. (B.), Callaghan, E.J. (E. J.), Caravaca, J. (J.), Chan, Y.D. (Y. D.), Chauhan, D. (D.), Chen, M. (M.), Cleveland, B.T. (B. T.), Cox, G.A. (G. A.), Dai, X. (X.), Deng, H. (H.), Descamps, F.B. (F. B.), Detwiler, J.A. (J. A.), Doe, P.J. (P. J.), Doucas, G. (G.), Drouin, P.-L. (P. L.), Dunford, M. (M.), Elliott, S.R. (S. R.), Evans, H.C. (H. C.), Ewan, G.T. (G. T.), Farine, J. (J.), Fergani, H. (H.), Fleurot, F. (F.), Ford, R.J. (R. J.), Formaggio, J.A. (J. A.), Gagnon, N. (N.), Gilje, K. (K.), Goon, J.T. (J. Tm.), Graham, K. (K.), Guillian, E. (E.), Habib, S. (S.), Hahn, R.L. (R. L.), Hallin, A.L. (A. L.), Hallman, E.D. (E. D.), Harvey, P.J. (P. J.), Hazama, R. (R.), Heintzelman, W.J. (W. J.), Heise, J. (J.), Helmer, R.L. (R. L.), Hime, A. (A.), Howard, C. (C.), Huang, M. (M.), Jagam, P. (P.), Jamieson, B. (B.), Jelley, N.A. (N. A.), Jerkins, M. (M.), Kéfélian, C. (C.), Keeter, K.J. (K. J.), Klein, J.R. (J. R.), Kormos, L.L. (L. L.), Kos, M. (M.), Krüger, A. (A.), Kraus, C. (C.), Krauss, C.B. (C. B.), Kutter, T. (T.), Kyba, C.C.M. (C. C.M.), Labe, K. (K.), Land, B.J. (B. J.), Lange, R. (R.), Latorre, A. (A.), Law, J. (J.), Lawson, I.T. (I. T.), Lesko, K.T. (K. T.), Leslie, J.R. (J. R.), Levine, I. (I.), Loach, J.C. (J. C.), Maclellan, R. (R.), Majerus, S. (S.), Mak, H.B. (H. B.), Maneira, J. (J.), Martin, R.D. (R. D.), Mastbaum, A. (A.), McCauley, N. (N.), McDonald, A.B. (A. B.), McGee, S.R. (S. R.), Miller, M.L. (M. L.), Monreal, B. (B.), Monroe, J. (J.), Nickel, B.G. (B. G.), Noble, A.J. (A. J.), O'Keeffe, H.M. (H. M.), Oblath, N.S. (N. S.), Okada, C.E. (C. E.), Ollerhead, R.W. (R. W.), Orebi Gann, G.D. (G. D.), Oser, S.M. (S. M.), Ott, R.A. (R. A.), Peeters, S.J.M. (S. J.M.), Poon, A.W.P. (A. W.P.), Prior, G. (G.), Reitzner, S.D. (S. D.), Rielage, K. (K.), Robertson, B.C. (B. C.), Robertson, R.G.H. (R. G.H.), Schwendener, M.H. (M. H.), Secrest, J.A. (J. A.), Seibert, S.R. (S. R.), Simard, O. (O.), Sinclair, D. (D.), Skensved, P. (P.), Sonley, T.J. (T. J.), Stonehill, L.C. (L. C.), Tešić, G. (G.), Tolich, N. (N.), Tsui, T. (T.), Van Berg, R. (R.), Vandevender, B.A. (B. A.), Virtue, C.J. (C. J.), Wall, B.L. (B. L.), Waller, D. (D.), Wan Chan Tseung, H. (H.), Wark, D.L. (D. L.), Wendland, J. (J.), West, N. (N.), Wilkerson, J.F. (J. F.), Winchester, T. (T.), Wilson, J.R. (J. R.), Wright, A. (A.), Yeh, M. (M.), Zhang, F. (F.), and Zuber, K. (K.)

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
Full Text
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28. Recent Results from SNO

Author

Sinclair, D, Kutter, T, Nally, CW, Oser, SM, Waltham, CE, Boger, J, Hahn, RL, Lange, R, Yeh, M, Bellerive, A, Dai, X, Dalnoki-Veress, F, Dosanjh, RS, Grant, DR, Hargrove, CK, Hemingway, RJ, Levine, I, Mifflin, C, Rollin, E, Simard, O, Starinsky, N, Tesic, G, Waller, D, Jagam, P, Labranche, H, Law, J, Lawson, IT, Nickel, BG, Ollerhead, RW, Simpson, JJ, Farine, J, Fleurot, F, Hallman, ED, Luoma, S, Schwendener, MH, Tafirout, R, Virtue, CJ, Chan, YD, Chen, X, Heeger, KM, Lesko, KT, Marino, AD, Norman, EB, Okada, CE, Poon, AWP, Rosendahl, SSE, Stokstad, RG, Boulay, MG, Bowles, TJ, Brice, SJ, Dragowsky, MR, Elliott, SR, Fowler, MM, Hamer, AS, Heise, J, Hime, A, Miller, GG, Van de Water, RG, Wilhelmy, JB, Wouters, JM, Biller, SD, Bowler, MG, Cleveland, BT, Doucas, G, Dunmore, JA, Fergani, H, Frame, K, Jelley, NA, Majerus, S, McGregor, G, Peeters, SJM, Sims, CJ, Thorman, M, Tseung, HWC, West, N, Wilson, JR, Zuber, K, Beier, EW, Dunford, M, Heintzelman, WJ, Kyba, CCM, McCauley, N, Rusu, VL, Van Berg, R, Ahmed, SN, Chen, M, Duncan, FA, Earle, ED, Fulsom, BG, Evans, HC, Ewan, GT, Graham, K, Hallin, AL, Handler, WB, Harvey, PJ, Kos, MS, Krumins, AV, Leslie, JR, and MacLellan, R

Subjects
Heavy water, chemistry.chemical_classification, Nuclear and High Energy Physics, chemistry.chemical_compound, Materials science, chemistry, Seesaw molecular geometry, Chemical engineering, Phase (matter), Salt (chemistry), Nanotechnology, Atomic and Molecular Physics, and Optics
Abstract

The SNO project has now completed two of its three major phases of operation. The no-oscillation hypothesis has been ruled out at 5σ in the pure heavy water phase and 8σ in the salt phase. Discussion in terms of the SeeSaw model is presented. © 2004 Published by Elsevier B.V.

Published
2004

30. Measurement of the nu(e) and total B-8 solar neutrino fluxes with the Sudbury Neutrino Observatory phase-III data set

Author

Aharmim, B., Ahmed, S. N., Amsbaugh, J. F., Anaya, J. M., Anthony, A. E., Banar, J., Barros, N., Beier, E. W., Bellerive, A., Beltran, B., Bergevin, M., Biller, S. D., Boudjemline, K., Boulay, M. G., Bowles, T. J., Browne, M. C., Bullard, T. V., Burritt, T. H., Cai, B., Chan, Y. D., Chauhan, D., Chen, M., Cleveland, B. T., Cox, G. A., Currat, C. A., Dai, X., Deng, H., Detwiler, J. A., DiMarco, M., Doe, P. J., Doucas, G., Dragowsky, M. R., Drouin, P. -L., Duba, C. A., Duncan, F. A., Dunford, M., Earle, E. D., Elliott, S. R., Evans, H. C., Ewan, G. T., Farine, J., Fergani, H., Fleurot, F., Ford, R. J., Formaggio, J. A., Fowler, M. M., Gagnon, N., Germani, J. V., Kormos, L. L., O'Keeffe, H. M., and SNO Collaboration

Abstract

This paper details the solar neutrino analysis of the 385.17-day phase-III data set acquired by the Sudbury Neutrino Observatory (SNO). An array of He-3 proportional counters was installed in the heavy-water target to measure precisely the rate of neutrino-deuteron neutral-current interactions. This technique to determine the total active B-8 solar neutrino flux was largely independent of the methods employed in previous phases. The total flux of active neutrinos was measured to be 5.54(-0.31)(+0.33)(stat.)(-0.34)(+0.36)(syst.) x 10(6) cm(-2) s(-1), consistent with previous measurements and standard solar models. A global analysis of solar and reactor neutrino mixing parameters yielded the best-fit values of Delta m(2) = 7.59(-0.21)(+0.19) x 10(-5) eV(2) and theta = 34.4(-1.2)(+1.3) degrees. DOI: 10.1103/PhysRevC.87.015502

Published
2013

31. 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

32. Determination of the νe and total B8 solar neutrino fluxes using the Sudbury Neutrino Observatory Phase I data set

Author

Aharmim, B., Ahmad, Q. R., Ahmed, S. N., Allen, R. C., Andersen, T. C., Anglin, John, Bühler, G., Barton, J. C., Beier, E. W., Bercovitch, M., Bergevin, M., Bigu, J., Biller, S. D., Black, R. A., Blevis, I., Boardman, R. J., Boger, J., Bonvin, E., Boulay, M. G., Bowler, M. G., Bowles, T. J., Brice, S. J., Browne, M. C., Bullard, T. V., Burritt, T. H., Cameron, J., Chan, Y. D., Chen, H. H., Chen, M., Chen, X., Cleveland, B. T., Cowan, J. H., Cowen, D. F., Cox, G. A., Currat, C. A., Dai, X., Dalnoki-Veress, F., Davidson, W. F., Deng, H., Dimarco, M., Doe, P. J., Doucas, G., Dragowsky, M. R., Duba, C. A., Duncan, F. A., Dunford, M., Dunmore, J. A., Earle, E. D., Elliott, S. R., Evans, H. C., Ewan, G. T., Farine, J., Fergani, H., Ferraris, A. P., Fleurot, F., Ford, R. J., Formaggio, J. A., Fowler, M. M., Frame, K., Frank, E. D., Frati, W., Gagnon, N., Germani, J. V., Gil, S., Goldschmidt, A., Goon, J. T., Graham, K., Grant, D. R., Guillian, E., Hahn, R. L., Hallin, A. L., Hallman, E. D., Hamer, A. S., Hamian, A. A., Handler, W. B., Haq, R. U., Hargrove, C. K., Harvey, P. J., Hazama, R., Heeger, K. M., Heintzelman, W. J., Heise, J., Helmer, R. L., Henning, R., Hepburn, J. D., Heron, H., Hewett, J., Hime, A., Howard, C., Howe, M. A., Huang, M., Hykaway, J. G., Isaac, M. C., Jagam, P., Jamieson, B., Jelley, N. A., Jillings, C., Jonkmans, G., Kazkaz, K., Keener, P. T., Kirch, K., Klein, J. R., Knox, A. B., Komar, R. J., Kormos, L. L., Kos, M., Kouzes, R., Krüger, A., Kraus, C., Krauss, C. B., Kutter, T., Kyba, C. C., Labranche, H., Lange, R., Law, J., Lawson, I. T., Lay, M., Lee, H. W., Lesko, K. T., Leslie, J. R., Levine, I., Loach, J. C., Locke, W., Luoma, S., Lyon, J., MacLellan, R., Majerus, S., Mak, H. B., Maneira, J., Marino, A. D., Martin, R., McCauley, N., McDonald, A. B., McDonald, D. S., McFarlane, K., McGee, S., McGregor, G., Drees, R. Meijer, Mes, H., Mifflin, C., Miknaitis, K. K., Miller, M. L., Milton, G., Moffat, B. A., Monreal, B., Moorhead, M., Morrissette, B., Nally, C. W., Neubauer, M. S., Newcomer, F. M., Ng, H. S., Nickel, B. G., Noble, A. J., Norman, E. B., Novikov, V. M., Oblath, N. S., Okada, C. E., O'Keeffe, H. M., Ollerhead, R. W., Omori, M., Orrell, J. L., Oser, S. M., Ott, R., Peeters, S. J., Poon, A. W., Prior, G., Reitzner, S. D., Rielage, K., Roberge, A., Robertson, B. C., Robertson, R. G., Rosendahl, S. S., Rowley, J. K., Rusu, V. L., Saettler, E., Schülke, A., Schwendener, M. H., Secrest, J. A., Seifert, H., Shatkay, M., Simpson, J. J., Sims, C. J., Sinclair, D., Skensved, P., Smith, A. R., Smith, M. W., Starinsky, N., Steiger, T. D., Stokstad, R. G., Stonehill, L. C., Storey, R. S., Sur, B., Tafirout, R., Tagg, N., Takeuchi, Y., Tanner, N. W., Taplin, R. K., Thorman, M., Thornewell, P. M., Tolich, N., Trent, P. T., Tserkovnyak, Y. I., Tsui, T., Tunnell, C. D., Van Berg, R., Water, R. G., Virtue, C. J., Walker, T. J., Wall, B. L., Waltham, C. E., Tseung, H. Wan Chan, Wang, J. -X., Wark, D. L., Wendland, J., West, N., Wilhelmy, J. B., Wilkerson, J. F., Wilson, J. R., Wittich, P., Wouters, J. M., Wright, A., Yeh, M., and Zuber, K.

Subjects
High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Nuclear Experiment
Abstract

This article provides the complete description of results from the Phase I data set of the Sudbury Neutrino Observatory (SNO). The Phase I data set is based on a 0.65 kiloton-year exposure of 2H2O (in the following denoted as D2O) to the solar B8 neutrino flux. Included here are details of the SNO physics and detector model, evaluations of systematic uncertainties, and estimates of backgrounds. Also discussed are SNO's approach to statistical extraction of the signals from the three neutrino reactions (charged current, neutral current, and elastic scattering) and the results of a search for a day-night asymmetry in the νe flux. Under the assumption that the B8 spectrum is undistorted, the measurements from this phase yield a solar νe flux of (νe)=1.76-0.05+0. 05(stat.)-0.09+0.09(syst.)×106 cm-2 s-1 and a non-νe component of (νμτ)=3.41-0.45+0.45(stat.)-0.45+0.48(syst.)×106 cm-2 s-1. The sum of these components provides a total flux in excellent agreement with the predictions of standard solar models. The day-night asymmetry in the νe flux is found to be Ae=7.0±4.9(stat.)-1.2+1.3%(syst.), when the asymmetry in the total flux is constrained to be zero. © 2007 The American Physical Society.

Published
2007
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33. E1 and E2 S factors of C-12(alpha,gamma(0))O-16 from gamma-ray angular distributions with a 4 pi-detector array

Author

Assuncao, M., Fey, M., Lefebvre-Schuhl, A., Kiener, J., Tatischeff, V., Hammer, J.W., Beck, C., Boukari-Pelissie, C., Coc, A., Correia, J.J., Courtin, S., Fleurot, F., Galanopoulos, E., Grama, C., Haas, F., Hammache, F., Hannachi, F., Harissopulos, S., Korichi, A., Kunz, R., LeDu, D., Lopez-Martens, A., Malcherek, D., Meunier, R., Paradellis, Th., Rousseau, M., Rowley, N., Staudt, G., Szilner, S., Thibaud, J.P., Weil, J.L., and KVI - Center for Advanced Radiation Technology

Subjects
STELLAR ENERGIES, NUCLEOSYNTHESIS, LIGHT-NUCLEI, DYNAMITRON ACCELERATOR, C-12, ESCAPE SUPPRESSED SPECTROMETER, KEY REACTION, ASTROPHYSICAL REACTION-RATE, CROSS-SECTION, MASSIVE STARS
Abstract

A new experiment to determine the thermonuclear cross section of the C-12(alpha,gamma)O-16 reaction has been performed in regular kinematics using an intense alpha-particle beam of up to 340 mu A from the Stuttgart DYNAMITRON. For the first time, a 4 pi-germanium-detector setup has been used to measure the angular distribution of the gamma rays at all angles simultaneously. It consisted of an array of nine EUROGAM high-purity Ge detectors in close geometry, actively shielded individually with bismuth germanate crystals. The C-12 targets were isotopically enriched by magnetic separation during implantation. The depth profiles of the implanted carbon in the C-12 targets were determined by Rutherford backscattering for purposes of cross-section normalization and absolute determination of the E1 and E2 S factors. Angular distributions of the gamma decay to the O-16 ground state were measured in the energy range E-c.m.=1.30-2.78 MeV and in the angular range (lab.) 30 degrees-130 degrees. From these distributions, astrophysical E1 and E2 S-factor functions vs energy were calculated, both of which are indispensable to the modeling of this reaction and the extrapolation toward lower energies. The separation of the E1 and E2 capture channels was done both by taking the phase value phi(12) as a free parameter and by fixing it using the results of elastic alpha-particle scattering on C-12 in the same energy range.

Published
2006

34. E1- and E2-S of 12 alpha,gamma 0 16 O from gamma-ray angular distributions with a 4pi detector array

Author

Assuncao, M., Fey, M., Lefebvre-Schuhl, A., Kiener, J., Tatischeff, V., Hammer, J.W., Beck, C., Boukari-Pelissie, C., Coc, A., Correia, J.J., Courtin, S., Fleurot, F., Galanopoulos, E., Grama, C., Haas, F., Hammache, F., Hannachi, F., Harissopulos, S., Korichi, A., Kunz, R., Ledu, D., Lopez-Martens, A., Malcherek, D., Meunier, R., Paradellis, Th., Rousseau, Marc, Rowley, N., Staudt, G., Szilner, S., Thibaud, J.P., Weil, J.L., Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Instituto de Física (IDF), Universidade de São Paulo (USP), Institut für Strahlenphysik (IFS), Universität Stuttgart, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Kernfysisch Versneller Instituut (KVI), University of Groningen [Groningen], SNO (SNO), Laurentian University, Institute of Nuclear Physics (INP), N.C.S.R., Gesellschaft für Schwerionenforschung (GSI), Institut de Physique Nucléaire d'Orsay (IPNO), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Physikalisches Institut [Tübingen], Eberhard Karls Universität Tübingen = Eberhard Karls University of Tuebingen, Rudjer Boskovic Institute [Zagreb], Institute of Isotopes (II), Hungarian Academy of Sciences (MTA), Department of Physics (DP), University of Kentucky, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Eberhard Karls Universität Tübingen, Ruder Boskovi'c Institute (RBI), and Ruder Boskovi'c Institute

Subjects
gamma)16O, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], thermonuclear stellar burning, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], E1 S factor, gamma angular distributions, 4pi gamma Germainum array, nuclear astrophysics, 25.55.-e, 24.30.-v, 26.20.+f, 27.20.+n, 12C(alpha, E2 S factor, cross-section measurements
Abstract

postscript file : 43 pages to appear in PRC : 19 pages in PRC - 1st preprint CSNSM 2004-02; 2nd preprint IPHC 06-001; A new experiment to determine the thermonuclear cross section of the 12C(alpha,gamma_0)16O reaction has been performed in regular kinematics using an intense alpha-particle beam of up to 340 muA from the Stuttgart DYNAMITRON. For the first time a 4pi-Germanium-detector setup has been used to measure the angular distribution of the gamma rays at all angles simultaneously. It consisted of an array of 9 EUROGAM HPGe detectors in close geometry, actively shielded individually with BGO crystals. The 12C targets were isotopically enriched by magnetic separation during implantation. The depth profiles of the implanted carbon in the 12C targets have been determined by Rutherford backscattering for purposes of cross section normalization and absolute determination of the E1 and E2 S factors. Angular distributions of the gamma decay to the 16O ground state have been measured in the energy range E_c.m.= 1.30-2.78 MeV and in the angular range (lab.) 30-130 degre. From these distributions, astrophysical E1 and E2 S-factor functions vs. energy have been calculated, both of which are indispensable for the modeling of this reaction and the extrapolation towards lower energies. The separation of the E1 and E2 capture channels has been done both by taking the phase value phi_12 as a free parameter and by fixing it using the results of elastic alpha-particle scattering on 12C in the same energy range.

Published
2006

35. E1- and E2-S-factors of 12C(alpha,gamma_0)16O from gamma-ray angular distributions with a 4pi-detector array

Author

Assunção, M, Fey, M, Lefebvre-Schuhl, A, Kiener, J, Tatischeff, V, Hammer, J W, Beck, C, Boukari-Pelissie, C, Coc, A, Correia, J J, Courtin, S, Fleurot, F, Galanopoulos, E, Grama, C, Hammache, F, Hannachi, F, Harissopoulos, S V, Korichi, A, Kuntz, R, LeDu, D, López-Martens, A, Malcherek, D, Meinier, R, Paradelis, T, Rousseau, M, Rowley, N, Staudt, G, Szilner, S, Thibaud, J P, and Weil, J L

Subjects
Nuclear Physics
Published
2006

36. 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

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

Author

Aharmim, B, Ahmed, S, Anthony, A, Beier, E, Bellerive, A, Bergevin, M, Biller, S, Boger, J, Boulay, M, Bowler, M, Bullard, T, Chan, Y, Chen, M, Chen, X, Cleveland, B, Cox, G, Currat, C, Dai, X, Dalnoki-Veress, F, Deng, H, Doe, P, Dosanjh, R, Doucas, G, Duba, C, Duncan, F, Dunford, M, Dunmore, J, Earle, E, Elliott, S, Evans, H, Ewan, G, Farine, J, Fergani, H, Fleurot, F, Formaggio, J, Frame, K, Frati, W, Fulsom, B, Gagnon, N, Graham, K, Grant, D, Hahn, R, Hall, J, Hallin, A, Hallman, E, Handler, W, Hargrove, C, Harvey, P, Hazama, R, Heeger, K, Heelan, L, Heintzelman, W, Heise, J, Helmer, R, Hemingway, R, Hime, A, Howard, C, Howe, M, Huang, M, Jagam, P, Jelley, N, Klein, J, Kormos, L, Kos, M, Krüger, A, Kraus, C, Krauss, C, Krumins, A, Kutter, T, Kyba, C, Labranche, H, Lange, R, Law, J, Lawson, I, Lesko, K, Leslie, J, Levine, I, Loach, J, Luoma, S, MacLellan, R, Majerus, S, Mak, H, Maneira, J, Marino, A, McCauley, N, McDonald, A, McGee, S, McGregor, G, Mifflin, C, Miknaitis, K, Moffat, B, Nally, C, Neubauer, M, Nickel, B, Noble, A, Norman, E, Oblath, N, Okada, C, Ollerhead, R, Orrell, J, Oser, S, Ouellet, C, Peeters, S, Poon, A, Rielage, K, Robertson, B, Robertson, R, Rollin, E, Rosendahl, S, Rusu, V, Schwendener, M, Seibert, S, Simard, O, Simpson, J, Sims, C, Sinclair, D, Skensved, P, Smith, M, Starinsky, N, Stokstad, R, Stonehill, L, Tafirout, R, Takeuchi, Y, Tešić, G, Thomson, M, Thorman, M, Tsui, T, Berg, R, Water, R, Virtue, C, Wall, B, Waller, D, Waltham, C, Tseung, H, Wark, D, Wendland, J, West, N, Wilkerson, J, Wilson, J, Wittich, P, Wouters, J, Wright, A, Yeh, M, and Zuber, K

Published
2005

38. 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

39. 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

40. E1 and E2 capture cross section and astrophysical reaction rate of the key reaction C-12(alpha,gamma)O-16

Author

Hammer, JW, Fey, M, Kunz, R, Kiener, J, Tatischeff, [No Value], Haas, F, Weil, JL, Assuncao, M, Beck, C, Boukari-Pelissie, C, Coc, A, Correia, JJ, Courtin, S, Fleurot, F, Galanopoulos, E, Grama, C, Hammache, F, Harissopulos, S, Korichi, A, Krmpotic, E, Le Du, D, Lopez-Martens, A, Malcherek, D, Meunier, R, Papka, P, Paradellis, T, Rousseau, M, Rowley, N, Staudt, G, Szilner, S, and KVI - Center for Advanced Radiation Technology

Subjects
NUCLEOSYNTHESIS, NUCLEAR, MASSIVE STARS
Published
2005

41. O-16 Coulomb dissociation: towards a new means to determine the C-12+alpha fusion rate in stars

Author

Fleurot, F, van den Berg, AM, Davids, B, Harakeh, MN, Kravchuk, VL, Wilschut, HW, Guillot, J, Laurent, H, Willis, A, Assuncao, M, Kiener, J, Lefebvre, A, de Sereville, N, Assuncao, L., Lefebvre, L., Tafischeff, V., Research unit Astroparticle Physics, Research unit Nuclear & Hadron Physics, and KVI - Center for Advanced Radiation Technology

Subjects
ages, Coulomb excitation, hydrostatic stellar nucleosynthesis, nucleosynthesis, Stellar structure, breakup and momentum distributions, NUCLEAR, nuclei with 6 < A < 19, interiors, STELLAR ENERGIES, E1, distorted-wave models, DELAYED ALPHA-SPECTRUM, BREAKUP, evolution, C-12(ALPHA,GAMMA)O-16, SCATTERING, coupled-channel and, N-16, CROSS-SECTION
Abstract

A feasibility study was made of an important aspect of the Coulomb-dissociation method, which has been proposed for the determination of the rate of the astrophysically important C-12(alpha, gamma)160 reaction. A crucial aspect is the disentanglement of nuclear and Coulomb interactions on one hand and the separation of dipole and quadrupole contributions on the other. As a first step the resonant breakup via two well-known 2(+) states of 160 was measured. The differential cross section of Pb-208(O-16, O-16*)Pb-208 and the angular correlations of the fragments C-12 and alpha in the center of mass were measured and compared to theoretical predictions calculated in DWBA and the coupled-channel method. The best agreement was found for the state at 11.52 MeV associated to a one-step excitation from the ground state, while the 9.84 MeV requires coupling to the first-excited 2(+) state and is not well described. (c) 2005 Elsevier B.V. All rights reserved.

Published
2005

42. New determination of the C-12(alpha, gamma)O-16 reaction rate from gamma-ray angular distribution measurements

Author

Hammer, J.W., Fey, M., Kunz, R., Kiener, J., Tatischeff, V., Haas, F., Weil, J.L., Assuncao, M., Beck, C., Boukari-Pelissie, C., Coc, A., Correia, J.J., Courtin, S., Fleurot, F., Galanopoulos, E., Grama, C., Hammache, F., Harissopulos, S., Korichi, A., Krmpotic, E., Le Du, D., Lopez-Martens, A., Malcherek, D., Meunier, R., Papka, P., Paradellis, T., Rousseau, M., Rowley, N., Staudt, G., Szilner, Suzana, and KVI - Center for Advanced Radiation Technology

Subjects
C-12(alpha, gamma)O-16 cross-section, thermonuclear reaction-rates, delayed alpha-spectrum, massive stars, low energies, nucleosynthesis, N-16, NUCLEOSYNTHESIS, C-12(ALPHA,GAMMA)O-16 CROSS-SECTION, DELAYED ALPHA-SPECTRUM, THERMONUCLEAR REACTION-RATES, CONSTRAINTS, NUCLEAR, LOW ENERGIES, MASSIVE STARS
Abstract

no abstract

Published
2005

43. E1 and E2 capture cross section and astrophysical reaction rate of the key reaction C-12(alpha, gamma)O-16

Author

Hammer, J.W, Fey, M., Kunz, R., Kiener, J., Tatischeff, V., Haas, F., Weil, J.L., Assuncao, M., Beck, C., Boukari-Pelissie, C., Coc, A., Correia, J.J., Courtin, S., Fleurot, F., Galanopoulos, E., Grama, C., Hammache, F., Harissopulos, S., Korichi, A., Krmpotic, E., Le Du, D., Lopez-Martens, A., Malcherek, D., Meunier, R., Papka, P., Paradellis, T., Rousseau, M., Rowley, N., Staudt, G., and Szilner, Suzana

Subjects
massive stars, nucleosynthesis, nuclear
Abstract

no abstract

Published
2005

44. New determination of the $^{12}C (\alpha, \gamma)^{16}O$ reaction rate from the gamma-ray angular distribution measurements

Author

Hammer, J.W., Fey, M., Kunz, R., Kiener, J., Tatischeff, V., Haas, F., Weil, J.L., Assuncao, M., Beck, C., Boukari-Pelissie, C., Coc, A., Correia, J.J., Courtin, S., Fleurot, F., Galanopoulos, E., Grama, C., Hammache, F., Harissopulos, S., Korichi, A., Krmpotic, E., Le Du, D., Lopez-Martens, A., Malcherek, D., Meunier, R., Papka, P., Paradellis, Th., Rousseau, Marc, Rowley, N., Staudt, G., Szilner, S., Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

The astrophysical reaction rate of the key reaction 12C(alpha,gamma)16O has been determined with the +/- 25% accuracy by two direct experiments at the Stuttgart DYNAMITRON in the framework of a large internatiuonal collaboration. The E1 and E2 capture amplitudes were deduced from 37 new gamma angular distributions in the energy range Ecm = 0.89-2.8 MeV. Highest sensitivity at a picobarn level was reached by using either a close 4pi array of 9 EUROGAM Phase II detectors or the GANDI array of 4 large movable Ge detectors. The S-factor values of the S_E1 and S_E2 excitation functions were calculated by a R-matrix analysis considering also elastic alpha-scattering data and the beta-delayed alpha-decay on 16N.

Published
2005

45. Astrophysical rate of O-15(alpha,gamma)Ne-19 via the (p, t) reaction in inverse kinematics

Author

Davids, B, van den Berg, A M, Dendooven, P, Fleurot, F, Hunyadi, M, de Huu, M A, Siemssen, R H, Wilschut, H W, Wortche, H J, Hernanz, M, Jose, J, Rehm, K E, Wuosmaa, A H, Segel, R E, Research unit Nuclear & Hadron Physics, and Research unit Astroparticle Physics

Subjects
ALPHA, NUCLEOSYNTHESIS, RP PROCESS, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Solar and Stellar Astrophysics, STRENGTHS, F-19, NE-19, DECAY, CLASSICAL NOVAE
Abstract

A recoil coincidence technique has been applied to measure the alpha-decay branching ratios of near-threshold states in Ne-19. Populating these states using the (p,t) reaction in inverse kinematics, we detected the recoils and their decay products with 100% geometric efficiency using a magnetic spectrometer. Combining our branching ratio measurements with independent determinations of the radiative widths of these states, we calculate the astrophysical rate of O-15(alpha,gamma)Ne-19. Using this reaction rate, we perform hydrodynamic calculations of nova outbursts and conclude that no significant breakout from the hot CNO cycles into the rp process occurs in novae via O-15(alpha,gamma)Ne-19.

Published
2003

46. Combined analysis of all three phases of solar neutrino data from the Sudbury Neutrino Observatory

Author

Aharmim, B., Ahmed, S. N., Anthony, A. E., Barros, N., Beier, E. W., Bellerive, A., Beltran, B., Bergevin, M., Biller, S. D., Boudjemline, K., Boulay, M. G., Cai, B., Chan, Y. D., Chauhan, D., Chen, M., Cleveland, B. T., Cox, G. A., Dai, X., Deng, H., Detwiler, J. A., DiMarco, M., Doe, P. J., Doucas, G., Drouin, P. -L., Duncan, F. A., Dunford, M., Earle, E. D., Elliott, S. R., Evans, H. C., Ewan, G. T., Farine, J., Fergani, H., Fleurot, F., Ford, R. J., Formaggio, J. A., Gagnon, N., Goon, J. T. M., 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., Kormos, L. L., O'Keeffe, Helen, SNO Collaboration, Aharmim, B., Ahmed, S. N., Anthony, A. E., Barros, N., Beier, E. W., Bellerive, A., Beltran, B., Bergevin, M., Biller, S. D., Boudjemline, K., Boulay, M. G., Cai, B., Chan, Y. D., Chauhan, D., Chen, M., Cleveland, B. T., Cox, G. A., Dai, X., Deng, H., Detwiler, J. A., DiMarco, M., Doe, P. J., Doucas, G., Drouin, P. -L., Duncan, F. A., Dunford, M., Earle, E. D., Elliott, S. R., Evans, H. C., Ewan, G. T., Farine, J., Fergani, H., Fleurot, F., Ford, R. J., Formaggio, J. A., Gagnon, N., Goon, J. T. M., 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., Kormos, L. L., O'Keeffe, Helen, and SNO Collaboration

Abstract

We report results from a combined analysis of solar neutrino data from all phases of the Sudbury Neutrino Observatory (SNO). By exploiting particle identification information obtained from the proportional counters installed during the third phase, this analysis improved background rejection in that phase of the experiment. The combined analysis of the SNO data resulted in a total flux of active neutrino flavors from B-8 decays in the Sun of (5.25 +/- 0.16(stat.)(-0.13)(+0.11)(syst.)) x 10(6) cm(-2)s(-1), while a two-flavor neutrino oscillation analysis yielded Delta m(21)(2) = (5.6(-1.4)(+1.9)) x 10(-5) eV(2) and tan(2) theta(12) = 0.427(-0.029)(+0.033). A three-flavor neutrino oscillation analysis combining the SNO result with results of all other solar neutrino experiments and reactor neutrino experiments yielded Delta m(21)(2) = (7.46(-0.19)(+0.20)) x 10(-5) eV(2), tan(2) theta(12) = 0.443(-0.025)(+0.030), and sin(2) theta(13) = (2.49(-0.32)(+0.20)) x 10(-2).

Published
2013

47. Low-energy-threshold analysis of the Phase I and Phase II data sets of the Sudbury Neutrino Observatory

Author

Aharmim, B., Ahmed, S. N., Anthony, A. E., Barros, N., Beier, E. W., Bellerive, A., Beltran, B., Bergevin, M., Biller, S. D., Boudjemline, K., Boulay, M. G., Burritt, T. H., Cai, B., Chan, Y. D., Chauhan, D., Chen, M., Cleveland, B. T., Cox, G. A., Dai, X., Deng, H., Detwiler, J., DiMarco, M., Doe, P. J., Doucas, G., Drouin, P-L., Duba, C. A., Duncan, F. A., Dunford, M., Earle, E. D., Elliott, S. R., Evans, H. C., Ewan, G. T., Farine, J., Fergani, H., Fleurot, F., Ford, R. J., Formaggio, J. A., Gagnon, N., 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., O'Keeffe, Helen, SNO Collaboration, Kormos, Laura, Aharmim, B., Ahmed, S. N., Anthony, A. E., Barros, N., Beier, E. W., Bellerive, A., Beltran, B., Bergevin, M., Biller, S. D., Boudjemline, K., Boulay, M. G., Burritt, T. H., Cai, B., Chan, Y. D., Chauhan, D., Chen, M., Cleveland, B. T., Cox, G. A., Dai, X., Deng, H., Detwiler, J., DiMarco, M., Doe, P. J., Doucas, G., Drouin, P-L., Duba, C. A., Duncan, F. A., Dunford, M., Earle, E. D., Elliott, S. R., Evans, H. C., Ewan, G. T., Farine, J., Fergani, H., Fleurot, F., Ford, R. J., Formaggio, J. A., Gagnon, N., 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., O'Keeffe, Helen, SNO Collaboration, and Kormos, Laura

Abstract

Results are reported from a joint analysis of Phase I and Phase II data from the Sudbury Neutrino Observatory. The effective electron kinetic energy threshold used is T-eff = 3.5MeV, the lowest analysis threshold yet achieved with water Cherenkov detector data. In units of 106 cm(-2) s(-1), the total flux of active-flavor neutrinos from B-8 decay in the Sun measured using the neutral current (NC) reaction of neutrinos on deuterons, with no constraint on the B-8 neutrino energy spectrum, is found to be Phi(NC) = 5.140(-0.158)(+0.160)(stat)(-0.117)(+0.132)(syst). These uncertainties are more than a factor of 2 smaller than previously published results. Also presented are the spectra of recoil electrons from the charged current reaction of neutrinos on deuterons and the elastic scattering of electrons. A fit to the Sudbury Neutrino Observatory data in which the free parameters directly describe the total B-8 neutrino flux and the energy-dependent nu(e) survival probability provides a measure of the total B-8 neutrino flux Phi(8B) = 5.046(-0.152)(+0.159)(stat)(-0.123)(+0.107)(syst). Combining these new results with results of all other solar experiments and the KamLAND reactor experiment yields best- fit values of the mixing parameters of theta(12) = 34.06(-0.84)(+1.16) degrees and Delta m(21)(2) = 7.59(-0.21)(+0.20) x 10(-5) eV(2). The global value of Phi(8B) is extracted to a precision of (+2.38)(-2.95)%. In a three-flavor analysis the best fit value of sin(2) theta(13) is 2.00(-1.63)(+2.09) x 10(-2). This implies an upper bound of sin(2) theta(13) < 0.057 (95% C.L.).

Published
2010

48. Combined analysis of all three phases of solar neutrino data from the Sudbury Neutrino Observatory

Author

Aharmim, B., primary, Ahmed, S. N., additional, Anthony, A. E., additional, Barros, N., additional, Beier, E. W., additional, Bellerive, A., additional, Beltran, B., additional, Bergevin, M., additional, Biller, S. D., additional, Boudjemline, K., additional, Boulay, M. G., additional, Cai, B., additional, Chan, Y. D., additional, Chauhan, D., additional, Chen, M., additional, Cleveland, B. T., additional, Cox, G. A., additional, Dai, X., additional, Deng, H., additional, Detwiler, J. A., additional, DiMarco, M., additional, Doe, P. J., additional, Doucas, G., additional, Drouin, P.-L., additional, Duncan, F. A., additional, Dunford, M., additional, Earle, E. D., additional, Elliott, S. R., additional, Evans, H. C., additional, Ewan, G. T., additional, Farine, J., additional, Fergani, H., additional, Fleurot, F., additional, Ford, R. J., additional, Formaggio, J. A., additional, Gagnon, N., additional, Goon, J. TM., additional, Graham, K., additional, Guillian, E., additional, Habib, S., additional, Hahn, R. L., additional, Hallin, A. L., additional, Hallman, E. D., additional, Harvey, P. J., additional, Hazama, R., additional, Heintzelman, W. J., additional, Heise, J., additional, Helmer, R. L., additional, Hime, A., additional, Howard, C., additional, Huang, M., additional, Jagam, P., additional, Jamieson, B., additional, Jelley, N. A., additional, Jerkins, M., additional, Keeter, K. J., additional, Klein, J. R., additional, Kormos, L. L., additional, Kos, M., additional, Kraus, C., additional, Krauss, C. B., additional, Kruger, A, additional, Kutter, T., additional, Kyba, C. C. M., additional, Lange, R., additional, Law, J., additional, Lawson, I. T., additional, Lesko, K. T., additional, Leslie, J. R., additional, Loach, J. C., additional, MacLellan, R., additional, Majerus, S., additional, Mak, H. B., additional, Maneira, J., additional, Martin, R., additional, McCauley, N., additional, McDonald, A. B., additional, McGee, S. R., additional, Miller, M. L., additional, Monreal, B., additional, Monroe, J., additional, Nickel, B. G., additional, Noble, A. J., additional, O’Keeffe, H. M., additional, Oblath, N. S., additional, Ollerhead, R. W., additional, Orebi Gann, G. D., additional, Oser, S. M., additional, Ott, R. A., additional, Peeters, S. J. M., additional, Poon, A. W. P., additional, Prior, G., additional, Reitzner, S. D., additional, Rielage, K., additional, Robertson, B. C., additional, Robertson, R. G. H., additional, Rosten, R. C., additional, Schwendener, M. H., additional, Secrest, J. A., additional, Seibert, S. R., additional, Simard, O., additional, Simpson, J. J., additional, Skensved, P., additional, Sonley, T. J., additional, Stonehill, L. C., additional, Tešić, G., additional, Tolich, N., additional, Tsui, T., additional, Van Berg, R., additional, VanDevender, B. A., additional, Virtue, C. J., additional, Wan Chan Tseung, H., additional, Wark, D. L., additional, Watson, P. J. S., additional, Wendland, J., additional, West, N., additional, Wilkerson, J. F., additional, Wilson, J. R., additional, Wouters, J. M., additional, Wright, A., additional, Yeh, M., additional, Zhang, F., additional, and Zuber, K., additional

Published
2013
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49. Measurement of theνeand total8B solar neutrino fluxes with the Sudbury Neutrino Observatory phase-III data set

Author

Aharmim, B., primary, Ahmed, S. N., additional, Amsbaugh, J. F., additional, Anaya, J. M., additional, Anthony, A. E., additional, Banar, J., additional, Barros, N., additional, Beier, E. W., additional, Bellerive, A., additional, Beltran, B., additional, Bergevin, M., additional, Biller, S. D., additional, Boudjemline, K., additional, Boulay, M. G., additional, Bowles, T. J., additional, Browne, M. C., additional, Bullard, T. V., additional, Burritt, T. H., additional, Cai, B., additional, Chan, Y. D., additional, Chauhan, D., additional, Chen, M., additional, Cleveland, B. T., additional, Cox, G. A., additional, Currat, C. A., additional, Dai, X., additional, Deng, H., additional, Detwiler, J. A., additional, DiMarco, M., additional, Doe, P. J., additional, Doucas, G., additional, Dragowsky, M. R., additional, Drouin, P.-L., additional, Duba, C. A., additional, Duncan, F. A., additional, Dunford, M., additional, Earle, E. D., additional, Elliott, S. R., additional, Evans, H. C., additional, Ewan, G. T., additional, Farine, J., additional, Fergani, H., additional, Fleurot, F., additional, Ford, R. J., additional, Formaggio, J. A., additional, Fowler, M. M., additional, Gagnon, N., additional, Germani, J. V., additional, Goldschmidt, A., additional, Goon, J. TM., additional, Graham, K., additional, Guillian, E., additional, Habib, S., additional, Hahn, R. L., additional, Hallin, A. L., additional, Hallman, E. D., additional, Hamian, A. A., additional, Harper, G. C., additional, Harvey, P. J., additional, Hazama, R., additional, Heeger, K. M., additional, Heintzelman, W. J., additional, Heise, J., additional, Helmer, R. L., additional, Henning, R., additional, Hime, A., additional, Howard, C., additional, Howe, M. A., additional, Huang, M., additional, Jagam, P., additional, Jamieson, B., additional, Jelley, N. A., additional, Keeter, K. J., additional, Klein, J. R., additional, Kormos, L. L., additional, Kos, M., additional, Krüger, A., additional, Kraus, C., additional, Krauss, C. B., additional, Kutter, T., additional, Kyba, C. C. M., additional, Lange, R., additional, Law, J., additional, Lawson, I. T., additional, Lesko, K. T., additional, Leslie, J. R., additional, Loach, J. C., additional, MacLellan, R., additional, Majerus, S., additional, Mak, H. B., additional, Maneira, J., additional, Martin, R., additional, McCauley, N., additional, McDonald, A. B., additional, McGee, S. R., additional, Mifflin, C., additional, Miller, G. G., additional, Miller, M. L., additional, Monreal, B., additional, Monroe, J., additional, Morissette, B., additional, Myers, A. W., additional, Nickel, B. G., additional, Noble, A. J., additional, O'Keeffe, H. M., additional, Oblath, N. S., additional, Ollerhead, R. W., additional, Orebi Gann, G. D., additional, Oser, S. M., additional, Ott, R. A., additional, Peeters, S. J. M., additional, Poon, A. W. P., additional, Prior, G., additional, Reitzner, S. D., additional, Rielage, K., additional, Robertson, B. C., additional, Robertson, R. G. H., additional, Rollin, E., additional, Schwendener, M. H., additional, Secrest, J. A., additional, Seibert, S. R., additional, Simard, O., additional, Simpson, J. J., additional, Skensved, P., additional, Smith, M. W. E., additional, Sonley, T. J., additional, Steiger, T. D., additional, Stonehill, L. C., additional, Tešić, G., additional, Thornewell, P. M., additional, Tolich, N., additional, Tsui, T., additional, Tunnell, C. D., additional, Van Wechel, T., additional, Van Berg, R., additional, VanDevender, B. A., additional, Virtue, C. J., additional, Wall, B. L., additional, Waller, D., additional, Wan Chan Tseung, H., additional, Wendland, J., additional, West, N., additional, Wilhelmy, J. B., additional, Wilkerson, J. F., additional, Wilson, J. R., additional, Wouters, J. M., additional, Wright, A., additional, Yeh, M., additional, Zhang, F., additional, and Zuber, K., additional

Published
2013
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50. Determination of the νe and total 8B solar neutrino fluxes using the Sudbury Neutrino Observatory Phase I data set

Author

Aharmim, B., Ahmad, Q.R., Ahmed, S.N., Allen, R.C., Andersen, T.C., Anglin, J.D., Bühler, G., Barton, J.C., Beier, E.W., Bercovitch, M., Bergevin, M., Kirch, K., Klein, J.R., Knox, A.B., Komar, R.J., Kormos, L.L., Kos, M., Kouzes, R., Krüger, A., Kraus, C., Krauss, C.B., Bigu, J., Kutter, T., Kyba, C.C.M., Labranche, H., Lange, R., Law, J., Lawson, I.T., Lay, M., Lee, H.W., Lesko, K.T., Leslie, J.R., Biller, S.D., Levine, I., Loach, J.C., Locke, W., Luoma, S., Lyon, J., MacLellan, R., Majerus, S., Mak, H.B., Maneira, J., Marino, A.D., Black, R.A., Martin, R., McCauley, N., McDonald, A.B., McDonald, D.S., McFarlane, K., McGee, S., McGregor, G., Drees, R.M., Mes, H., Mifflin, C., Blevis, I., Miknaitis, K.K.S., Miller, M.L., Milton, G., Moffat, B.A., Monreal, B., Moorhead, M., Morrissette, B., Nally, C.W., Neubauer, M.S., Newcomer, F.M., Boardman, R.J., Ng, H.S., Nickel, B.G., Noble, A.J., Norman, E.B., Novikov, V.M., Oblath, N.S., Okada, C.E., O'Keeffe, H.M., Ollerhead, R.W., Omori, M., Boger, J., Orrell, J.L., Oser, S.M., Ott, R., Peeters, S.J.M., Poon, A.W.P., Prior, G., Reitzner, S.D., Rielage, K., Roberge, A., Robertson, B.C., Bonvin, E., Robertson, R.G.H., Rosendahl, S.S.E., Rowley, J.K., Rusu, V.L., Saettler, E., Schülke, A., Schwendener, M.H., Secrest, J.A., Seifert, H., Shatkay, M., Boulay, M.G., Simpson, J.J., Sims, C.J., Sinclair, D., Skensved, P., Smith, A.R., Smith, M.W.E., Starinsky, N., Steiger, T.D., Stokstad, R.G., Stonehill, L.C., Bowler, M.G., Storey, R.S., Sur, B., Tafirout, R., Tagg, N., Takeuchi, Y., Tanner, N.W., Taplin, R.K., Thorman, M., Thornewell, P.M., Tolich, N., Bowles, T.J., Trent, P.T., Tserkovnyak, Y.I., Tsui, T., Tunnell, C.D., Van Berg, R., Van De Water, R.G., Virtue, C.J., Walker, T.J., Wall, B.L., Waltham, C.E., Brice, S.J., Tseung, H.W.C., Wang, J.X., Wark, D.L., Wendland, J., West, N., Wilhelmy, J.B., Wilkerson, J.F., Wilson, J.R., Wittich, P., Wouters, J.M., Browne, M.C., Wright, A., Yeh, M., Zuber, K., Bullard, T.V., Burritt, T.H., Cameron, J., Chan, Y.D., Chen, H.H., Chen, M., Chen, X., Cleveland, B.T., Cowan, J.H.M., Cowen, D.F., Cox, G.A., Currat, C.A., Dai, X., Dalnoki-Veress, F., Davidson, W.F., Deng, H., Dimarco, M., Doe, P.J., Doucas, G., Dragowsky, M.R., Duba, C.A., Duncan, F.A., Dunford, M., Dunmore, J.A., Earle, E.D., Elliott, S.R., Evans, H.C., Ewan, G.T., Farine, J., Fergani, H., Ferraris, A.P., Fleurot, F., Ford, R.J., Formaggio, J.A., Fowler, M.M., Frame, K., Frank, E.D., Frati, W., Gagnon, N., Germani, J.V., Gil, S., Goldschmidt, A., Goon, J.T.M., Graham, K., Grant, D.R., Guillian, E., Hahn, R.L., Hallin, A.L., Hallman, E.D., Hamer, A.S., Hamian, A.A., Handler, W.B., Haq, R.U., Hargrove, C.K., Harvey, P.J., Hazama, R., Heeger, K.M., Heintzelman, W.J., Heise, J., Helmer, R.L., Henning, R., Hepburn, J.D., Heron, H., Hewett, J., Hime, A., Howard, C., Howe, M.A., Huang, M., Hykaway, J.G., Isaac, M.C.P., Jagam, P., Jamieson, B., Jelley, N.A., Jillings, C., Jonkmans, G., Kazkaz, K., Keener, P.T., Aharmim, B., Ahmad, Q.R., Ahmed, S.N., Allen, R.C., Andersen, T.C., Anglin, J.D., Bühler, G., Barton, J.C., Beier, E.W., Bercovitch, M., Bergevin, M., Kirch, K., Klein, J.R., Knox, A.B., Komar, R.J., Kormos, L.L., Kos, M., Kouzes, R., Krüger, A., Kraus, C., Krauss, C.B., Bigu, J., Kutter, T., Kyba, C.C.M., Labranche, H., Lange, R., Law, J., Lawson, I.T., Lay, M., Lee, H.W., Lesko, K.T., Leslie, J.R., Biller, S.D., Levine, I., Loach, J.C., Locke, W., Luoma, S., Lyon, J., MacLellan, R., Majerus, S., Mak, H.B., Maneira, J., Marino, A.D., Black, R.A., Martin, R., McCauley, N., McDonald, A.B., McDonald, D.S., McFarlane, K., McGee, S., McGregor, G., Drees, R.M., Mes, H., Mifflin, C., Blevis, I., Miknaitis, K.K.S., Miller, M.L., Milton, G., Moffat, B.A., Monreal, B., Moorhead, M., Morrissette, B., Nally, C.W., Neubauer, M.S., Newcomer, F.M., Boardman, R.J., Ng, H.S., Nickel, B.G., Noble, A.J., Norman, E.B., Novikov, V.M., Oblath, N.S., Okada, C.E., O'Keeffe, H.M., Ollerhead, R.W., Omori, M., Boger, J., Orrell, J.L., Oser, S.M., Ott, R., Peeters, S.J.M., Poon, A.W.P., Prior, G., Reitzner, S.D., Rielage, K., Roberge, A., Robertson, B.C., Bonvin, E., Robertson, R.G.H., Rosendahl, S.S.E., Rowley, J.K., Rusu, V.L., Saettler, E., Schülke, A., Schwendener, M.H., Secrest, J.A., Seifert, H., Shatkay, M., Boulay, M.G., Simpson, J.J., Sims, C.J., Sinclair, D., Skensved, P., Smith, A.R., Smith, M.W.E., Starinsky, N., Steiger, T.D., Stokstad, R.G., Stonehill, L.C., Bowler, M.G., Storey, R.S., Sur, B., Tafirout, R., Tagg, N., Takeuchi, Y., Tanner, N.W., Taplin, R.K., Thorman, M., Thornewell, P.M., Tolich, N., Bowles, T.J., Trent, P.T., Tserkovnyak, Y.I., Tsui, T., Tunnell, C.D., Van Berg, R., Van De Water, R.G., Virtue, C.J., Walker, T.J., Wall, B.L., Waltham, C.E., Brice, S.J., Tseung, H.W.C., Wang, J.X., Wark, D.L., Wendland, J., West, N., Wilhelmy, J.B., Wilkerson, J.F., Wilson, J.R., Wittich, P., Wouters, J.M., Browne, M.C., Wright, A., Yeh, M., Zuber, K., Bullard, T.V., Burritt, T.H., Cameron, J., Chan, Y.D., Chen, H.H., Chen, M., Chen, X., Cleveland, B.T., Cowan, J.H.M., Cowen, D.F., Cox, G.A., Currat, C.A., Dai, X., Dalnoki-Veress, F., Davidson, W.F., Deng, H., Dimarco, M., Doe, P.J., Doucas, G., Dragowsky, M.R., Duba, C.A., Duncan, F.A., Dunford, M., Dunmore, J.A., Earle, E.D., Elliott, S.R., Evans, H.C., Ewan, G.T., Farine, J., Fergani, H., Ferraris, A.P., Fleurot, F., Ford, R.J., Formaggio, J.A., Fowler, M.M., Frame, K., Frank, E.D., Frati, W., Gagnon, N., Germani, J.V., Gil, S., Goldschmidt, A., Goon, J.T.M., Graham, K., Grant, D.R., Guillian, E., Hahn, R.L., Hallin, A.L., Hallman, E.D., Hamer, A.S., Hamian, A.A., Handler, W.B., Haq, R.U., Hargrove, C.K., Harvey, P.J., Hazama, R., Heeger, K.M., Heintzelman, W.J., Heise, J., Helmer, R.L., Henning, R., Hepburn, J.D., Heron, H., Hewett, J., Hime, A., Howard, C., Howe, M.A., Huang, M., Hykaway, J.G., Isaac, M.C.P., Jagam, P., Jamieson, B., Jelley, N.A., Jillings, C., Jonkmans, G., Kazkaz, K., and Keener, P.T.

Abstract

This article provides the complete description of results from the Phase I data set of the Sudbury Neutrino Observatory (SNO). The Phase I data set is based on a 0.65 kiloton-year exposure of 2H2O (in the following denoted as D2O) to the solar 8B neutrino flux. Included here are details of the SNO physics and detector model, evaluations of systematic uncertainties, and estimates of backgrounds. Also discussed are SNO's approach to statistical extraction of the signals from the three neutrino reactions (charged current, neutral current, and elastic scattering) and the results of a search for a day-night asymmetry in the νe flux. Under the assumption that the 8B spectrum is undistorted, the measurements from this phase yield a solar νe flux of (νe)=1.76+0.05-0. 05(stat.)+0.09-0.09(syst.)×106 cm-2 s-1 and a non-νe component of (νμτ)=3.41+0.45-0.45(stat.)+0.45-0.48(syst.)×106 cm-2 s-1. The sum of these components provides a total flux in excellent agreement with the predictions of standard solar models. The day-night asymmetry in the νe flux is found to be Ae=7.0±4.9(stat.)+1.3-1.2%(syst.), when the asymmetry in the total flux is constrained to be zero.

Published
2007

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