Low-energy-threshold analysis of the Phase I and Phase II data sets of the Sudbury Neutrino Observatory
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 Teff=3.5 MeV, the lowest analysis threshold yet achieved with water Cherenkov detector data. In units of 106 cm-2 s-1, the total flux...
| Үндсэн зохиолчид: | , , , , , |
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| Бусад зохиолчид: | |
| Формат: | Өгүүллэг |
| Хэл сонгох: | en_US |
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American Physical Society
2010
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| Онлайн хандалт: | http://hdl.handle.net/1721.1/57490 https://orcid.org/0000-0002-3757-9883 |
| _version_ | 1826196752358703104 |
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| author | Monroe, Jocelyn Formaggio, Joseph A. Miller, M. L. Monreal, Benjamin Ott, Richard A. Sonley, T. J. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Monroe, Jocelyn Formaggio, Joseph A. Miller, M. L. Monreal, Benjamin Ott, Richard A. Sonley, T. J. |
| author_sort | Monroe, Jocelyn |
| collection | MIT |
| description | 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 Teff=3.5 MeV, 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 8B decay in the Sun measured using the neutral current (NC) reaction of neutrinos on deuterons, with no constraint on the 8B neutrino energy spectrum, is found to be PhiNC=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 8B neutrino flux and the energy-dependent νe survival probability provides a measure of the total 8B neutrino flux Phi8B=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 Theta12=34.06-0.84+1.16 degrees and Δm212=7.59-0.21+0.20×10-5 eV2. The global value of Phi8B is extracted to a precision of -2.95+2.38%. In a three-flavor analysis the best fit value of sin2Theta13 is 2.00-1.63+2.09×10-2. This implies an upper bound of sin2Theta13<0.057 (95% C.L.). |
| first_indexed | 2024-09-23T10:37:11Z |
| format | Article |
| id | mit-1721.1/57490 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:37:11Z |
| publishDate | 2010 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/574902022-09-30T21:48:30Z Low-energy-threshold analysis of the Phase I and Phase II data sets of the Sudbury Neutrino Observatory Monroe, Jocelyn Formaggio, Joseph A. Miller, M. L. Monreal, Benjamin Ott, Richard A. Sonley, T. J. Massachusetts Institute of Technology. Department of Physics Monroe, Jocelyn Monroe, Jocelyn Formaggio, Joseph A. Miller, M. L. Monreal, Benjamin Ott, Richard A. Sonley, T. J. 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 Teff=3.5 MeV, 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 8B decay in the Sun measured using the neutral current (NC) reaction of neutrinos on deuterons, with no constraint on the 8B neutrino energy spectrum, is found to be PhiNC=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 8B neutrino flux and the energy-dependent νe survival probability provides a measure of the total 8B neutrino flux Phi8B=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 Theta12=34.06-0.84+1.16 degrees and Δm212=7.59-0.21+0.20×10-5 eV2. The global value of Phi8B is extracted to a precision of -2.95+2.38%. In a three-flavor analysis the best fit value of sin2Theta13 is 2.00-1.63+2.09×10-2. This implies an upper bound of sin2Theta13<0.057 (95% C.L.). Natural Sciences and Engineering Research Council of Canada Industry Canada National Research Council Canada Atomic Energy of Canada Limited Ontario Power Generation High Performance Computing Virtual Laboratory Canadian Foundation for Innovation Canada Research Chairs United States Department of Energy National Energy Research Scientific Computing Center Fundação para a Ciencia e a Technologia Alfred P. Sloan Foundation Science and Technology Facilities Council, United Kingdom 2010-08-10T21:02:24Z 2010-08-10T21:02:24Z 2010-05 2009-10 Article http://purl.org/eprint/type/JournalArticle 0556-2813 http://hdl.handle.net/1721.1/57490 SNO Collaboration et al. “Low-energy-threshold analysis of the Phase I and Phase II data sets of the Sudbury Neutrino Observatory.” Physical Review C 81.5 (2010): 055504. © 2010 The American Physical Society. https://orcid.org/0000-0002-3757-9883 en_US http://dx.doi.org/10.1103/PhysRevC.81.055504 Physical Review C Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Monroe, Jocelyn Formaggio, Joseph A. Miller, M. L. Monreal, Benjamin Ott, Richard A. Sonley, T. J. Low-energy-threshold analysis of the Phase I and Phase II data sets of the Sudbury Neutrino Observatory |
| title | Low-energy-threshold analysis of the Phase I and Phase II data sets of the Sudbury Neutrino Observatory |
| title_full | Low-energy-threshold analysis of the Phase I and Phase II data sets of the Sudbury Neutrino Observatory |
| title_fullStr | Low-energy-threshold analysis of the Phase I and Phase II data sets of the Sudbury Neutrino Observatory |
| title_full_unstemmed | Low-energy-threshold analysis of the Phase I and Phase II data sets of the Sudbury Neutrino Observatory |
| title_short | Low-energy-threshold analysis of the Phase I and Phase II data sets of the Sudbury Neutrino Observatory |
| title_sort | low energy threshold analysis of the phase i and phase ii data sets of the sudbury neutrino observatory |
| url | http://hdl.handle.net/1721.1/57490 https://orcid.org/0000-0002-3757-9883 |
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