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35 results on '"B C Robertson"'

1. Neutral current and day night measurements from the pure D2O phase of SNO

Author

B. C. Robertson, J. R. Leslie, M. Dunford, Eric B. Norman, J. B. Wilhelmy, T. Kutter, J. Manor, J. Farine, S. D. Biller, C. W. Nally, T. V. Bullard, A. S. Hamer, D. R. Grant, Guthrie Miller, S. J. Brice, James R. Wilson, E. W. Beier, P. J. Harvey, J. Cameron, C. E. Okada, J. F. Wilkerson, E. D. Hallman, X. Chen, W. J. Heintzelman, S. R. Elliott, R. G. Stokstad, David A. Sinclair, J. A. Formaggio, P. Jagam, Reda Tafirout, Christopher C. M. Kyba, M. W. Smith, C. J. Virtue, Ilan Levine, H. B. Mak, R. G. Van de Water, N. Starinsky, G. Doucas, P. Skensved, G. T. Ewan, K. K. Schaffer, G. A. Cox, K. Kazkaz, M. M. Fowler, F. Dalnoki-Veress, M. G. Bowler, C. K. Hargrove, K. Graham, S. M. Oser, P. T. Keener, S. S.E. Rosendahl, S. Majerus, John L. Orrell, Hal Evans, W. Frati, S. Luoma, B. T. Cleveland, W. B. Handler, D. L. Wark, K. T. Lesko, N. Tagg, E. D. Earle, N. Gagnon, Y.D. Chan, K. M. Heeger, A. Hime, Mark Guy Boulay, X. Dai, J. J. Simpson, R. L. Hahn, R. Hazama, Minfang Yeh, J. A. Dunmore, N. A. Jelley, K. Frame, A. L. Hallin, M. Howe, J. M. Wouters, Peter Wittich, A. B. McDonald, N. McCauley, A. D. Marino, R. Van Berg, H. Fergani, M. L. Chen, I. Lawson, A. J. Noble, Jochen Klein, V. L. Rusu, J. Maneira, A. W. P. Poon, F. A. Duncan, R. G. H. Robertson, M. R. Dragowsky, T. Spreitzer, T.J. Bowles, G. McGregor, Chris Waltham, L. C. Stonehill, R. L. Helmer, M. H. Schwendener, J. Law, C. J. Sims, J. Heise, C. A. Duba, N. West, and P. J. Doe

Subjects
Physics, Elastic scattering, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, Solar neutrino, Atomic and Molecular Physics, and Optics, Massless particle, Nuclear physics, Neutrino detector, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Neutrino, Nuclear Experiment, Charged current, Lepton
Abstract

The Sudbury Neutrino Observatory is a 1000 T D 2 O Cerenkov detector that is sensitive to 8 B solar neutrinos. The energy, radius, and direction with respect to the sun is measured for each neutrino event; these distributions are used to separately determine the rates of the charged current, neutral current and electron scattering reactions of neutrinos on deuterium. Assuming an undistorted 8 B spectrum, the ν e component of the 8 B solar flux is φ e = 1.76 +0.05 −0.05 (stat.) +0.09 −0.09 (syst.) × 10 6 cm −2 s −1 based on events with a measured kinetic enegy above 5 MeV. The non- ν e component is φ μτ = 3.41 +0.45 −0.45 (stat.) +0.48 −0.45 (syst.) × 10 6 cm −2 s −1 , 5.3 σ greater than zero, providing strong evidence for solar ν e flavor transformation. The total flux measured with the NC reaction is φ NC = 5.09 +0.044 −0.43 (stat.) +0.46 −0.43 (syst.) × 10 6 cm −2 s −1 , consistent with solar models. The night minus day rate is 14.0% ± 6.3% +1.5 −1.4 % of the average rate. If the total flux of active neutrinos is additionally constrained to have no asymmetry, the ν e asymmetry is found to be 7.0% ± 4.9% +1.3 −1.2 %. A global solar neutrino analysis is terms of matter-enhanced oscillations of two active flavors strongly favors the Large Mixing Angle (LMA) solution.

Published
2016

2. Constraints on nucleon decay via invisible modes from the Sudbury Neutrino Observatory

Author

X. Chen, H. Wan Chan Tseung, H. Labranche, D. L. Wark, F. Dalnoki-Veress, A. D. Marino, B. C. Robertson, N. McCauley, R. L. Helmer, G. Doucas, R. Van Berg, R. G. H. Robertson, J. B. Wilhelmy, T. Kutter, M. G. Bowler, I. Levine, M. L. Chen, Monica Dunford, S. S.E. Rosendahl, Chris Waltham, C. J. Virtue, S. J. Brice, A. W. P. Poon, J. A. Dunmore, R. L. Hahn, R. W. Ollerhead, C. W. Nally, G. McGregor, P. Jagam, K.K.S. Miknaitis, J. M. Wouters, S. Majerus, P. Skensved, X. Dai, J. F. Wilkerson, R. G. Van de Water, Joshua R. Klein, N. Gagnon, Reda Tafirout, N. Starinsky, Darren Grant, Alain Bellerive, R. S. Dosanjh, R. Lange, Mark Neubauer, W. Frati, S. N. Ahmed, R. Hazama, E. D. Earle, E. Rollin, W. B. Handler, H. B. Mak, T. J. Bowles, Andrew Hime, J. R. Wilson, Guthrie Miller, M. W.E. Smith, F. A. Duncan, M. A. Howe, A. B. McDonald, Christopher C. M. Kyba, R. MacLellan, M. A. Thomson, J. Heise, S. D. Biller, J. R. Leslie, B. A. Moffat, Bernie G. Nickel, J. Boger, F. Fleurot, M. H. Schwendener, B. T. Cleveland, Malcolm M. Fowler, N. S. Oblath, A. E. Anthony, N. West, A. V. Krumins, C. A. Duba, S. Luoma, Joseph A. Formaggio, C. Ouellet, Minfang Yeh, C. E. Okada, P. J. Harvey, W. J. Heintzelman, S. R. Elliott, O. Simard, David A. Sinclair, G. T. Ewan, I. T. Lawson, G. Tešić, A. L. Hallin, C. Mifflin, S. J. M. Peeters, N. A. Jelley, M. Thorman, D. Waller, V. L. Rusu, J. C. Hall, J. Law, M. R. Dragowsky, G. A. Cox, K. T. Lesko, L. C. Stonehill, J. Farine, C. J. Sims, C. K. Hargrove, A. J. Noble, T. V. Bullard, R. J. Hemingway, Kai Zuber, H. Fergani, J. Maneira, M. Kos, A. S. Hamer, Hal Evans, E. W. Beier, S. McGee, R. G. Stokstad, B. L. Wall, Peter Wittich, Eric B. Norman, E. D. Hallman, P. J. Doe, Y. Takeuchi, J. J. Simpson, Yuen-Dat Chan, K. Graham, S. M. Oser, M.G. Boulay, B. G. Fulsom, K. Frame, K. M. Heeger, and John L. Orrell

Subjects
Physics, Sudbury Neutrino Observatory, Particle physics, Proton, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Gamma ray, FOS: Physical sciences, General Physics and Astronomy, Elementary particle, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, Baryon, High Energy Physics - Experiment (hep-ex), Particle decay, 0103 physical sciences, Neutron, High Energy Physics::Experiment, 010306 general physics, Nucleon, Nuclear Experiment
Abstract

Data from the Sudbury Neutrino Observatory have been used to constrain the lifetime for nucleon decay to ``invisible'' modes, such as n -> 3 nu. The analysis was based on a search for gamma-rays from the de-excitation of the residual nucleus that would result from the disappearance of either a proton or neutron from O16. A limit of tau_inv > 2 x 10^{29} years is obtained at 90% confidence for either neutron or proton decay modes. This is about an order of magnitude more stringent than previous constraints on invisible proton decay modes and 400 times more stringent than similar neutron modes., Update includes missing efficiency factor (limits change by factor of 2) Submitted to Physical Review Letters

Published
2016

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

Author

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

Subjects
Nuclear and High Energy Physics, Particle physics, Solar neutrino, FOS: Physical sciences, Cosmic ray, 7. Clean energy, 01 natural sciences, Particle identification, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Neutrino oscillation, Nuclear Experiment, Charged current, Solar and Stellar Astrophysics (astro-ph.SR), Physics, Sudbury Neutrino Observatory, Neutral current, 010308 nuclear & particles physics, QC0793, High Energy Physics - Phenomenology, Astrophysics - Solar and Stellar Astrophysics, Neutrino
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
2013

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

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, Solar energetic particles, 010308 nuclear & particles physics, Solar neutrino, Cosmic ray, 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, Neutrino, 010306 general physics, Neutrino oscillation, Charged current, Lepton
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

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

Author

Monica Dunford, J. Maneira, A. W. P. Poon, Christopher C. M. Kyba, J. R. Leslie, J. Tm. Goon, J. F. Wilkerson, Joseph A. Formaggio, M. Kos, Minfang Yeh, C. J. Virtue, C. B. Krauss, N. S. Oblath, M. L. Miller, E. W. Beier, J. C. Loach, B. Beltran, R. A. Ott, R. D. Martin, H. B. Mak, N. A. Jelley, Jocelyn Monroe, N. Gagnon, Andrew Hime, I. Levine, R. G. H. Robertson, E. D. Hallman, M. Huang, G. Tešić, F. A. Duncan, Howe, F. Fleurot, R. Hazama, Yuen-Dat Chan, K. Graham, A. L. Hallin, J. R. Wilson, Kai Zuber, C. D. Tunnell, S. McGee, B. C. Robertson, A. E. Anthony, S. M. Oser, G. D. Orebi Gann, S. D. Biller, N. Barros, Bernie G. Nickel, B. Aharmim, G. Doucas, A. B. McDonald, C. Kraus, S. J. M. Peeters, P. J. Harvey, J.M. Wouters, R. L. Hahn, H. Deng, T. Tsui, S. Habib, N. Tolich, T. Kutter, P. Skensved, M. DiMarco, Steven Elliott, B.A. VanDevender, P. J. Doe, R. J. Ford, M. H. Schwendener, F. Zhang, J. Law, B. L. Wall, Hal Evans, David A. Sinclair, H. M. O'Keeffe, K. Boudjemline, N. West, W. J. Heintzelman, K. T. Lesko, C. Howard, J. Farine, A. J. Noble, B. Morissette, Keith Rielage, K. J. Keeter, T. J. Sonley, Bei Cai, E. Guillian, R. MacLellan, D. Chauhan, Mark Guy Boulay, L. L. Kormos, P.-L. Drouin, B. Jamieson, R. L. Helmer, G. T. Ewan, S. D. Reitzner, S. N. Ahmed, S. R. Seibert, J. Heise, X. Dai, J. A. Detwiler, C. A. Duba, H. Fergani, J. A. Secrest, I. T. Lawson, D. Waller, G. A. Cox, Benjamin Monreal, E. D. Earle, H. Wan Chan Tseung, D. L. Wark, G. Prior, T.H. Burritt, B. T. Cleveland, A. Wright, O. Simard, Alain Bellerive, L. C. Stonehill, M. Bergevin, N. McCauley, R. Van Berg, M. L. Chen, S. Majerus, and Joshua R. Klein

Subjects
Nuclear and High Energy Physics, Particle physics, Solar neutrino, FOS: Physical sciences, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Neutrino oscillation, Nuclear Experiment, Charged current, Physics, Research Groups and Centres\Physics\Low Temperature Physics, Sudbury Neutrino Observatory, Faculty of Science\Physics, 010308 nuclear & particles physics, Solar neutrino problem, High Energy Physics - Phenomenology, 13. Climate action, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Lepton
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=3.5 MeV, the lowest analysis threshold yet achieved with water Cherenkov detector data. In units of 10^6 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 Phi_NC = 5.140 ^{+0.160}_{-0.158} (stat) ^{+0.132}_{-0.117} (syst). These uncertainties are more than a factor of two 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 SNO data in which the free parameters directly describe the total 8B neutrino flux and the energy-dependent nu_e survival probability provides a measure of the total 8B neutrino flux Phi_8B = 5.046 ^{+0.159}_{-0.152} (stat) ^{+0.107}_{-0.123} (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 ^{+1.16}_{-0.84} degrees and Delta m^2_{21}=7.59 ^{+0.20}_{-0.21} 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 ^{+2.09}_{-1.63} x 10^{-2}. Interpreting this as a limit implies an upper bound of sin^2\theta_{13} < 0.057 (95% C. L.)., Comment: 53 pages, 40 figures, submitted to Phys. Rev. C

Published
2010

6. Measurement of the slope of the π0 electromagnetic form factor

Author

B. C. Robertson, J. M. Poutissou, C.J. Virtue, S.H. Chew, A. Shor, T. Mulera, Chris Waltham, F. Farzanpay, M. D. Hasinoff, A.W. Stetz, J. Lowe, P. Gumplinger, and I. Blevis

Subjects
Nuclear physics, Quark, Physics, Loop (topology), Nuclear and High Energy Physics, Branching fraction, Quantum electrodynamics, Form factor (quantum field theory), Value (computer science), High Energy Physics::Experiment
Abstract

We have measured the slope parameter of the π 0 electromagnetic form factor by measuring the partial branching ratio of the Dalitz decay π 0 → γe + e − into high-invariant-mass electron-positron pairs. We obtain a value a =0.026 with a total (statistical and systematic) error of ±0.054, in agreement with vector dominance and quark loop calculations.

Published
1992

7. Radiative muon capture on hydrogen

Author

D. G. Sample, S. C. McDonald, R. Henderson, B. C. Robertson, Georges Azuelos, N. S. Zhang, T. von Egidy, P. Depommier, Shama Ahmad, W. Bertl, W. Schott, G. N. Taylor, D. H. Wright, J. M. Poutissou, M. Blecher, G. Jonkmans, C. Q. Chen, D. S. Armstrong, R. Poutissou, J. A. Macdonald, M. D. Hasinoff, A. J. Larabee, P. Gumplinger, and T. P. Gorringe

Subjects
Physics, Particle physics, Schedule, Muon, Physics and Astronomy (miscellaneous), Hydrogen, Form factor (quantum field theory), chemistry.chemical_element, Measure (mathematics), Particle detector, Muon capture, Massless particle, Nuclear physics, Pseudoscalar, Particle decay, chemistry, Radiative transfer, Engineering (miscellaneous), Lepton
Abstract

The radiative capture of negative muons by protons can be used to measure the weak induced pseu-doscalar form factor. Brief arguments why this method is preferable to ordinary muon capture are given followed by a discussion of the experimental difficulties. The solution to these problems as attempted by experiment #452 at TRIUMF is presented together with preliminary results from the first run in August 1990. An outlook on the expected final precision and the experimental schedule is also given.

Published
1992

8. Photon asymmetry in radiative muon capture on calcium

Author

D. Horvath, C.J. Virtue, H.W. Roser, M. D. Hasinoff, B. C. Robertson, K.A. Aniol, and F. Entezami

Subjects
Physics, Nuclear reaction, Coupling constant, Nuclear and High Energy Physics, Photon, Branching fraction, media_common.quotation_subject, Electron, Asymmetry, Muon capture, Nuclear physics, Radiative transfer, High Energy Physics::Experiment, Atomic physics, media_common
Abstract

The photon asymmetry (α γ ) and partial branching ratio above 57 MeV ( R k > 57) have been measured for radiative muon capture on 40 Ca in order to determine the magnitude of the induced-pseudoscalar coupling constant, g p . Based on 2500 events a value of α γ = 1.32 +0.57 −0.47 is obtained from a fit to the photon time spectrum; this implies a value for g p g A . For the first time the asymmetry signal is clearly visible and unconstrained multi-parameter fits reproduce the parameters obtained from the decay electron spectrum. The present results are discussed and compared in detail with previous results.

Published
1990

9. A cylindrical drift chamber for radiative muon capture experiments at TRIUMF

Author

B. C. Robertson, A. Serna-Angel, Shama Ahmad, D. H. Wright, Georges Azuelos, T. P. Gorringe, R.S. Henderson, R.J. Dawson, M. D. Hasinoff, and M. Blecher

Subjects
Physics, Nuclear and High Energy Physics, Muon, Branching fraction, Cyclotron, Photon energy, Muon capture, law.invention, Nuclear physics, Particle decay, Nuclear Energy and Engineering, law, Radiative transfer, Electrical and Electronic Engineering, Nuclear Experiment, Lepton
Abstract

Radiative muon capture (RMC), mu Z to nu (Z-1) gamma , is a process which is particularly sensitive to the induced pseudoscalar coupling constant, g/sub p/, which is still very poorly determined experimentally. Due to the extremely small branching ratio ( approximately 6*10/sup -8/), the elementary reaction mu p to nu n gamma has never been measured. To date, efforts have been concentrated on nuclear RMC where the branching ratio is much larger, but the interpretation of these results is hindered by nuclear structure uncertainties. A measurement is being carried out at TRIUMF to determine the rate of RMC on hydrogen to a precision of 8%, leading to a determination of g/sub p/ with an error of 10%. The detection system is based on a large-volume cylindrical drift chamber, in an axial magnetic field, acting as an e/sup +/e/sup -/ pair spectrometer with a solid angle of approximately=2 pi . At a magnetic field of 2.7 kG, the acceptance of 70-MeV photons is about 0.8% for a 1.0-mm-thick Pb photon converter. Monte Carlo calculations indicate a photon energy resolution of >

Published
1990

10. Determination of theνeand totalB8solar neutrino fluxes using the Sudbury Neutrino Observatory Phase I data set

Author

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

Subjects
Physics, Elastic scattering, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, Particle physics, Neutral current, 010308 nuclear & particles physics, Solar neutrino, media_common.quotation_subject, Cosmic ray, 01 natural sciences, 7. Clean energy, Asymmetry, Nuclear physics, 13. Climate action, 0103 physical sciences, Neutrino, 010306 general physics, Charged current, media_common
Abstract

This article provides the complete description of resultsfrom the Phase I data set of the Sudbury Neutrino Observatory (SNO). ThePhase I data set is based on a 0.65 kt-year exposure of heavy water tothe solar 8B neutrino flux. Included here are details of the SNO physicsand detector model, evaluations of systematic uncertainties, andestimates of backgrounds. Also discussed are SNO's approach tostatistical extraction of the signals from the three neutrino reactions(charged current, neutral current, and elastic scattering) and theresults of a search for a day-night asymmetry in the ?e flux. Under theassumption that the 8B spectrum is undistorted, the measurements fromthis 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-?ecomponent ?(? mu) = 3.41+0.45?0.45(stat.)+0.48?0.45 (syst.) x 106 cm?2s?1. The sum of these components provides a total flux in excellentagreement with the predictions of Standard Solar Models. The day-nightasymmetry in the ?e flux is found to be Ae = 7.0 +- 4.9 (stat.)+1.3?1.2percent (sys.), when the asymmetry in the total flux is constrained to bezero.

Published
2007

11. Electron energy spectra, fluxes, and day-night asymmetries of8B solar neutrinos from measurements with NaCl dissolved in the heavy-water detector at the Sudbury Neutrino Observatory

Author

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

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, Solar neutrino, Isotopes of boron, 01 natural sciences, 7. Clean energy, Spectral line, Nuclear physics, 13. Climate action, 0103 physical sciences, High Energy Physics::Experiment, Atomic physics, Neutrino, 010306 general physics, Neutrino oscillation, Lepton
Abstract

Results are reported from the complete salt phase of the Sudbury Neutrino Observatory experiment in which NaCl was dissolved in the {sup 2}H{sub 2}O (''D{sub 2}O'') target. The addition of salt enhanced the signal from neutron capture as compared to the pure D{sub 2}O 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 10{sup 6}cm{sup -2}s{sup -1}, the total flux of active-flavor neutrinos from {sup 8}B decay in the Sun is found to be 4.94{sub -0.21}{sup +0.21}(stat){sub -0.34}{sup +0.38}(syst) and the integral flux of electron neutrinos for an undistorted {sup 8}B spectrum is 1.68{sub -0.06}{sup +0.06}(stat){sub -0.09}{sup +0.08}(syst); the signal from ({nu}{sub x},e) elastic scattering is equivalent to an electron-neutrino flux of 2.35{sub -0.22}{sup +0.22}(stat){sub -0.15}{sup +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}m{sup 2}=(8.0{sub -0.4}{sup +0.6})x10{sup -5}more » eV{sup 2} and {theta}=33.9{sub -2.2}{sup +2.4} degrees.« less

Published
2005

12. Electron antineutrino search at the Sudbury Neutrino Observatory

Author

S. M. Oser, S. J. M. Peeters, R. W. Ollerhead, V. L. Rusu, B. A. Moffat, Xiaobo Chen, M.G. Boulay, R. L. Helmer, J. A. Dunmore, K.K.S. Miknaitis, Monica Dunford, A. W. P. Poon, S. D. Biller, J. Boger, C. E. Okada, G. Doucas, David A. Sinclair, T. V. Bullard, P. Skensved, J. F. Wilkerson, L. C. Stonehill, N. McCauley, A. L. Hallin, C. Mifflin, Reda Tafirout, R. Van Berg, Darren Grant, P. J. Harvey, S. J. Brice, B. G. Fulsom, C. B. Krauss, N. S. Oblath, M. L. Chen, M. A. Howe, E. D. Hallman, H. Fergani, S. N. Ahmed, G. McGregor, S. S.E. Rosendahl, M. A. Thomson, J. Heise, M. R. Dragowsky, T. J. Bowles, P. J. Doe, R. G. Stokstad, C. K. Hargrove, F. Fleurot, S. Luoma, Malcolm M. Fowler, X. Dai, G. Tešić, I. Levine, S. Majerus, Keith Rielage, A. B. McDonald, Christopher C. M. Kyba, P. Jagam, C. J. Virtue, Joshua R. Klein, R. Lange, Mark Neubauer, B. G. Nickel, A. Krüger, R. G. Van de Water, N. Starinsky, Hal Evans, W. Frati, D. Waller, H. B. Mak, M. S. Kos, A. S. Hamer, W. B. Handler, R. MacLellan, R. L. Hahn, Guthrie Miller, Y. Takeuchi, O. Simard, E. D. Earle, Peter Wittich, B. Aharmim, M. W.E. Smith, F. A. Duncan, S. McGee, B. L. Wall, T. Tsui, J. M. Wouters, J. J. Simpson, C. Ouellet, Eric B. Norman, J. R. Leslie, C. A. Duba, B. C. Robertson, B. T. Cleveland, I. T. Lawson, L. L. Kormos, S. R. Elliott, J. B. Wilhelmy, T. Kutter, G. T. Ewan, G. A. Cox, R. J. Hemingway, N. Gagnon, R. Hazama, C. W. Nally, E. W. Beier, R. S. Dosanjh, E. Rollin, N. West, A. V. Krumins, W. J. Heintzelman, K. T. Lesko, H. Wan Chan Tseung, J. Maneira, H. Labranche, Alain Bellerive, D. L. Wark, Chris Waltham, F. Dalnoki-Veress, A. D. Marino, R. G. H. Robertson, Joseph A. Formaggio, J. Farine, Minfang Yeh, A. J. Noble, J. R. Wilson, N. A. Jelley, Andrew Hime, M. H. Schwendener, J. Law, C. J. Sims, John L. Orrell, Kai Zuber, K. Frame, K. M. Heeger, Yuen-Dat Chan, and K. Graham

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, Flux, FOS: Physical sciences, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Neutron, High Energy Physics::Experiment, Neutrino, 010306 general physics, Neutrino oscillation, Nuclear Experiment, Lepton, Bar (unit)
Abstract

Upper limits on the \nuebar flux at the Sudbury Neutrino Observatory have been set based on the \nuebar charged-current reaction on deuterium. The reaction produces a positron and two neutrons in coincidence. This distinctive signature allows a search with very low background for \nuebar's from the Sun and other potential sources. Both differential and integral limits on the \nuebar flux have been placed in the energy range from 4 -- 14.8 MeV. For an energy-independent ��_e --> \nuebar conversion mechanism, the integral limit on the flux of solar \nuebar's in the energy range from 4 -- 14.8 MeV is found to be ��_\nuebar, submitted to Phys. Rev. D

Published
2004

13. Measurement of the Total ActiveB8Solar Neutrino Flux at the Sudbury Neutrino Observatory with Enhanced Neutral Current Sensitivity

Author

R. L. Helmer, P. J. Doe, R. L. Hahn, Monica Dunford, A. W. P. Poon, R. MacLellan, S. R. Elliott, R. W. Ollerhead, E. D. Hallman, G. T. Ewan, J. Maneira, I. T. Lawson, W. B. Handler, Y. Takeuchi, J. F. Wilkerson, J. Boger, J. J. Simpson, D. Waller, Reda Tafirout, Darren Grant, Christopher C. M. Kyba, Yuen-Dat Chan, B. L. Wall, C. K. Hargrove, P. Skensved, C. E. Okada, David A. Sinclair, G. A. Cox, Eric B. Norman, F. A. Duncan, R. S. Dosanjh, B. A. Moffat, K. Graham, E. Rollin, J. R. Leslie, M. W.E. Smith, B. T. Cleveland, J. M. Wouters, R. G. Stokstad, Chris Waltham, M. A. Howe, Malcolm M. Fowler, C. Ouellet, S. M. Oser, H. Fergani, Guthrie Miller, J. A. Dunmore, J. Farine, A. J. Noble, X. Chen, X. Dai, G. Tešić, N. West, A. V. Krumins, R. Lange, S. J. M. Peeters, V. L. Rusu, K.K.S. Miknaitis, W. J. Heintzelman, M.G. Boulay, S. J. Brice, A. S. Hamer, K. T. Lesko, G. McGregor, A. L. Hallin, J. R. Wilson, C. Mifflin, T. V. Bullard, R. J. Hemingway, S. McGee, M. Kos, E. D. Earle, S. D. Biller, Bernie G. Nickel, H. Wan Chan Tseung, I. Levine, N. S. Oblath, E. W. Beier, C. A. Duba, H. Labranche, A. B. McDonald, D. L. Wark, M. R. Dragowsky, F. Dalnoki-Veress, M. H. Schwendener, M. G. Bowler, A. D. Marino, B. G. Fulsom, J. C. Hall, J. Law, R. G. H. Robertson, C. J. Sims, Kai Zuber, C. W. Nally, Andrew Hime, B. C. Robertson, G. Doucas, J. B. Wilhelmy, T. Kutter, C. J. Virtue, N. Gagnon, John L. Orrell, L. C. Stonehill, S. N. Ahmed, R. Hazama, T. J. Bowles, Joseph A. Formaggio, N. McCauley, Minfang Yeh, N. A. Jelley, M. Thorman, R. Van Berg, O. Simard, Hal Evans, K. Frame, Alain Bellerive, K. M. Heeger, M. L. Chen, M. A. Thomson, J. Heise, F. Fleurot, A. E. Anthony, S. Luoma, P. Jagam, Joshua R. Klein, R. G. Van de Water, N. Starinsky, H. B. Mak, S. S.E. Rosendahl, P. J. Harvey, and S. Majerus

Subjects
Physics, Particle physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, General Physics and Astronomy, Flux, Cosmic ray, 7. Clean energy, 01 natural sciences, Nuclear physics, Neutrino detector, 13. Climate action, 0103 physical sciences, High Energy Physics::Experiment, Neutrino, 010306 general physics, Neutrino oscillation, Astrophysics::Galaxy Astrophysics, Lepton
Abstract

The Sudbury Neutrino Observatory has precisely determined the total active (nu(x)) B-8 solar neutrino flux without assumptions about the energy dependence of the nu(e) survival probability. The measurements were made with dissolved NaCl in heavy water to enhance the sensitivity and signature for neutral-current interactions. The flux is found to be 5.21+/-0.27(stat)+/-0.38(syst)x10(6) cm(-2) s(-1), in agreement with previous measurements and standard solar models. A global analysis of these and other solar and reactor neutrino results yields Deltam(2)=7.1(-0.6)(+1.2)x10(-5) eV(2) and theta= 32.5(-2.3)(+2.4) degrees. Maximal mixing is rejected at the equivalent of 5.4 standard deviations.

Published
2004

14. Direct evidence for neutrino flavor transformation from neutral-current interactions in the Sudbury Neutrino Observatory

Author

D. S. McDonald, E. D. Earle, J. A. Dunmore, R. U. Haq, Christopher C. M. Kyba, M. C.P. Isaac, V. M. Novikov, T. J. Bowles, G. Jonkmans, E. Saettler, H. Fergani, J. R. Wilson, G. Doucas, E. D. Hallman, M. H. Schwendener, E. Bonvin, R. Hazama, Herbert H. Chen, A. B. Knox, N. McCauley, P. J. Doe, J. Law, P. Jagam, N. W. Tanner, C. J. Sims, J. V. Germani, A. Roberge, H. Heron, A. L. Hallin, R. Van Berg, C. Mifflin, J. B. Wilhelmy, P. T. Trent, H. W. Lee, Joseph A. Formaggio, M. R. Dragowsky, M. M. Fowler, S. D. Biller, J. Hewett, T. V. Bullard, Andrew Hime, T. D. Steiger, R. K. Taplin, M. C. Browne, Minfang Yeh, M. L. Chen, R. L. Hahn, Salvador Gil, K. Kazkaz, A. A. Hamian, J. Farine, G. T. Ewan, K. K. Schaffer, N. A. Jelley, N. West, E. W. Beier, Hal Evans, S. S.E. Rosendahl, E. T.H. Clifford, F.M. Newcomer, M. Lay, R. A. Black, F. A. Duncan, J. D. Anglin, P. J. Harvey, Yuen-Dat Chan, S. J. Brice, K. Graham, D. F. Cowen, C. E. Okada, J. D. Hepburn, R. G. H. Robertson, T. C. Andersen, Steven Elliott, J. J. Simpson, Peter Wittich, David A. Sinclair, E.D. Frank, A. S. Hamer, S. M. Oser, R. G. Stokstad, L. C. Stonehill, J. Maneira, R. G. Van de Water, I. Levine, N. Starinsky, P. M. Thornewell, T. J. Radcliffe, K. Frame, S. Majerus, J. H.M. Cowan, T. Spreitzer, D. L. Wark, J. Cameron, W. J. Heintzelman, Chris Waltham, C. J. Virtue, M. O'Neill, M. Moorhead, R. J. Komar, R. C. Allen, K. T. Lesko, M.G. Boulay, Joshua R. Klein, K. McFarlane, N. Gagnon, K. M. Heeger, I. T. Lawson, W. Frati, John L. Orrell, J. M. Wouters, Bhaskar Sur, B. C. Robertson, F. Dalnoki-Veress, H. B. Mak, Richard T. Kouzes, Q. R. Ahmad, A. P. Ferraris, R. J. Boardman, A. D. Marino, Anett Schulke, J. Bigu, M. Bercovitch, J. X. Wang, P. T. Keener, T. Kutter, R. Meijer Drees, G. A. Cox, V. L. Rusu, A. B. McDonald, R. S. Storey, G. McGregor, M. A. Howe, R. W. Ollerhead, A. J. Noble, H. Seifert, J. Manor, Y. I. Tserkovnyak, J. Lyon, Eric B. Norman, J. Heise, C. K. Hargrove, S. Luoma, M. Thorman, N. Tagg, J. F. Wilkerson, Reda Tafirout, Darren Grant, B. A. Moffat, J. G. Hykawy, W. F. Davidson, J. C. Barton, R. L. Helmer, I. Blevis, M. Omori, Monica Dunford, A. W. P. Poon, R. J. Ford, Xin Chen, P. Skensved, G. Milton, X. Dai, H. S. Ng, Mark Neubauer, M. G. Bowler, W. Locke, J. R. Leslie, J. Boger, B. T. Cleveland, W. B. Handler, M. Shatkay, M. W.E. Smith, Alan R. Smith, C. W. Nally, G. Bühler, C. Jillings, J. K. Rowley, C. A. Duba, G. G. Miller, Développement et Communication Chimique chez les Insectes ( DCCI ), Centre National de la Recherche Scientifique ( CNRS ) -Université de Bourgogne ( UB ) -AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, and Delon, Viviane

Subjects
Particle physics, Physics::Instrumentation and Detectors, Solar neutrino, Astrophysics::High Energy Astrophysical Phenomena, General Physics and Astronomy, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Tau neutrino, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Neutrino oscillation, Nuclear Experiment, Physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Solar neutrino problem, Neutrino detector, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Neutrino, Lepton
Abstract

Observations of neutral current neutrino interactions on deuterium in the Sudbury Neutrino Observatory are reported. Using the neutral current, elastic scattering, and charged current reactions and assuming the standard 8B shape, the electron-neutrino component of the 8B solar flux is 1.76 +/-0.05(stat.)+/-0.09(syst.) x10^6/(cm^2 s), for a kinetic energy threshold of 5 MeV. The non-electron neutrino component is 3.41+/-0.45(stat.)+0.48,-0.45(syst.) x10^6/(cm^2 s), 5.3 standard deviations greater than zero, providing strong evidence for solar electron neutrino flavor transformation. The total flux measured with the NC reaction is 5.09 +0.44,-0.43(stat.)+0.46,-0.43(syst.)x10^6/(cm^2 s), consistent with solar models., Comment: 6 pages, 3 figures, correction to author list and minor typographical corrections to references

Published
2002

15. Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in SNO

Author

T. V. Bullard, M. H. Schwendener, B. C. Robertson, E. W. Beier, H. Fergani, G. Doucas, J. M. Wouters, H. W. Lee, J. Law, H. S. Ng, D. L. Wark, P. J. Doe, A. R. Smith, K. McFarlane, J. B. Wilhelmy, T. Kutter, Guthrie Miller, J.D. Anglin, A. S. Hamer, Q. R. Ahmad, C. J. Sims, J. V. Germani, M. Moorhead, R. Meijer Drees, J. Cameron, A. B. McDonald, H. Heron, F. Dalnoki-Veress, Min Chen, A. D. Marino, Christopher C. M. Kyba, John Heise, R. U. Haq, N. McCauley, K. Kazkaz, T. J. Radcliffe, R. G. H. Robertson, M. R. Dragowsky, E. Saettler, R. J. Boardman, T. Spreitzer, G. A. Cox, Andrew Hime, W. B. Handler, J.L. Hewett, Herbert H. Chen, Jochen Klein, Ilan Levine, C. J. Virtue, M. W.E. Smith, I. Lawson, N. Tagg, Anett Schulke, S. J. Brice, J. Bigu, Chris Waltham, A. J. Noble, Y. I. Tserkovnyak, R. L. Hahn, Salvador Gil, G. McGregor, J. G. Hykawy, Yuen-Dat Chan, A. P. Ferraris, J. X. Wang, E. D. Earle, A. L. Hallin, C. Mifflin, B. T. Cleveland, X. Chen, N.W. Tanner, K. Graham, L. C. Stonehill, S. M. Oser, J. Farine, Minfang Yeh, G. Jonkmans, N. West, V. L. Rusu, P. Skensved, M. Lay, R. K. Taplin, F. A. Duncan, J. H.M. Cowan, M. G. Boulay, W. J. Heintzelman, J. C. Barton, N. A. Jelley, M. Thorman, R. A. Black, M. O'Neill, J. J. Simpson, P. T. Keener, R. J. Ford, D. F. Cowen, Monica Dunford, J. Maneira, F. M. Newcomer, A. W. P. Poon, G. Bühler, J. A. Dunmore, A. Knox, P. T. Trent, R. W. Ollerhead, Peter Wittich, J. Lyon, M. C.P. Isaac, R. G. Stokstad, N. Gagnon, K. Frame, J. K. Rowley, B. A. Moffat, K. M. Heeger, I. Blevis, R. S. Storey, John L. Orrell, M. Omori, Joseph A. Formaggio, E. Bonvin, E. D. Hallman, R. Van Berg, W. Locke, A. Roberge, E. T.H. Clifford, J. Boger, T. J. Bowles, C. E. Okada, J. D. Hepburn, S. R. Elliott, David A. Sinclair, G. T. Ewan, T. D. Steiger, K. K. Schaffer, James R. Wilson, T. C. Andersen, A. A. Hamian, E.D. Frank, C. K. Hargrove, D. S. McDonald, X. Dai, V. M. Novikov, R. J. Komar, R. C. Allen, W. Frati, Bhaskar Sur, Mark Neubauer, Richard T. Kouzes, S. S.E. Rosendahl, Hal Evans, M. G. Bowler, M. C. Browne, Ryuta Hazama, R. L. Helmer, M. Bercovitch, S. Majerus, M. Shatkay, C. W. Nally, C. Jillings, C. A. Duba, H. B. Mak, W.F. Davidson, S. D. Biller, J. F. Wilkerson, Reda Tafirout, P. J. Harvey, Darren Grant, P. M. Thornewell, G. Milton, M. A. Howe, J. Manor, Malcolm M. Fowler, Eric B. Norman, H. Seifert, J. R. Leslie, P. Jagam, R. G. Van de Water, N. Starinsky, S. Luoma, and K. T. Lesko

Subjects
Physics, Particle physics, Sudbury Neutrino Observatory, Neutral current, Physics::Instrumentation and Detectors, Solar neutrino, Astrophysics::Cosmology and Extragalactic Astrophysics, Solar neutrino problem, Nuclear physics, Neutrino detector, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Neutrino, Nuclear Experiment, Neutrino oscillation, Charged current
Abstract

The Sudbury Neutrino Observatory (SNO) is a 1,000 tonne heavy water Cerenkov‐based neutrino detector situated 2,000 meters underground in INCO’s Creighton Mine near Sudbury, Ontario, Canada. For the neutrinos from 8B decay in the Sun SNO observes the Charged Current neutrino reaction sensitive only to electron neutrinos and others (Neutral Current and Elastic Scattering) sensitive to all active neutrino types and thereby can search for direct evidence of neutrino flavor change. Using these reactions and assuming the standard 8B shape, the ve component of the 8B solar flux is φe = 1.76−0.05+0.05(stat.)−0.09+0.09 (syst.) × 106 cm−2s−1 for a kinetic energy threshold of 5 MeV. The non‐ve component is φμτ = 3.41−0.45+0.45(stat.)−0.45+0.48 (syst.) × 106 cm−2s−1, 5.3σ greater than zero, providing strong evidence for solar ve flavor transformation. The total flux measured with the NC reaction is φNC = 5.09−0.43+0.44(stat.)−0.43+0.46 (syst.) × 106 cm−2s−1, consistent with solar models. For charged current events, ...

Published
2002

16. Measurement of day and night neutrino energy spectra at SNO and constraints on neutrino mixing parameters

Author

J. C. Barton, R. L. Helmer, Monica Dunford, A. W. P. Poon, M. Bercovitch, M. Lay, H. Fergani, J. J. Simpson, P. J. Doe, C. J. Virtue, J. A. Dunmore, R. W. Ollerhead, H. Heron, R. U. Haq, J. Lyon, E. D. Earle, B. A. Moffat, I. Levine, T. J. Radcliffe, G. T. Ewan, W. Locke, J. R. Leslie, B. C. Robertson, A. P. Ferraris, J. X. Wang, V. L. Rusu, K. K. Schaffer, S. D. Biller, A. S. Hamer, B. T. Cleveland, T. Kutter, R. Meijer Drees, N. Tagg, F. A. Duncan, R. J. Ford, P. J. Harvey, N. McCauley, M. C.P. Isaac, M. H. Schwendener, N. Gagnon, Xin Chen, E. Bonvin, R. Hazama, E. D. Hallman, A. J. Noble, R. Van Berg, H. S. Ng, P. M. Thornewell, T. D. Steiger, W. J. Heintzelman, M. L. Chen, A. Roberge, K. McFarlane, P. T. Trent, A. A. Hamian, D. F. Cowen, J. Law, C. J. Sims, Joshua R. Klein, J. V. Germani, D. L. Wark, R. G. Van de Water, N. Starinsky, K. T. Lesko, W. Frati, Q. R. Ahmad, Bhaskar Sur, F. Dalnoki-Veress, T. V. Bullard, P. T. Keener, H. B. Mak, A. D. Marino, I. T. Lawson, Richard T. Kouzes, Anett Schulke, J. Bigu, R. J. Boardman, G. A. Cox, E. W. Beier, M. G. Bowler, J. Heise, C. K. Hargrove, G. McGregor, S. Luoma, J. Boger, Y. I. Tserkovnyak, R. G. Stokstad, N.W. Tanner, D. S. McDonald, A. B. McDonald, M. Shatkay, L. C. Stonehill, J. K. Rowley, M. O'Neill, S. S.E. Rosendahl, G. G. Miller, H. W. Lee, V. M. Novikov, C. W. Nally, Christopher C. M. Kyba, Alan R. Smith, M. Moorhead, G. Jonkmans, E. Saettler, S. Majerus, J. Cameron, H. Seifert, Herbert H. Chen, G. Bühler, J. M. Wouters, E. T.H. Clifford, P. Jagam, C. E. Okada, J. D. Hepburn, M. A. Howe, David A. Sinclair, Yuen-Dat Chan, K. Graham, J. Hewett, S. M. Oser, A. L. Hallin, Andrew Hime, J. Manor, C. Mifflin, J. H.M. Cowan, J. Maneira, I. Blevis, R. L. Hahn, Salvador Gil, G. Doucas, M. Omori, M.G. Boulay, C. Jillings, J. F. Wilkerson, Eric B. Norman, J. R. Wilson, K. Frame, Reda Tafirout, Darren Grant, A. B. Knox, C. A. Duba, K. M. Heeger, Hal Evans, John L. Orrell, W. F. Davidson, J. Farine, R. A. Black, W. B. Handler, Joseph A. Formaggio, Minfang Yeh, N. A. Jelley, N. West, M. Thorman, M. W.E. Smith, M. M. Fowler, M. C. Browne, Steven Elliott, T. C. Andersen, E.D. Frank, R. S. Storey, J. G. Hykawy, R. J. Komar, R. C. Allen, P. Skensved, R. K. Taplin, T. J. Bowles, X. Dai, Mark Neubauer, Chris Waltham, G. Milton, R. G. H. Robertson, T. Spreitzer, F.M. Newcomer, J. D. Anglin, S. J. Brice, Peter Wittich, J. B. Wilhelmy, M. R. Dragowsky, K. Kazkaz, Delon, Viviane, Développement et Communication Chimique chez les Insectes ( DCCI ), and Centre National de la Recherche Scientifique ( CNRS ) -Université de Bourgogne ( UB ) -AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, FOS: Physical sciences, General Physics and Astronomy, Flux, Cosmic ray, Astrophysics, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Nuclear astrophysics, Nuclear Experiment (nucl-ex), 010306 general physics, Neutrino oscillation, Nuclear Experiment, Astrophysics::Galaxy Astrophysics, Charged current, Physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, Astrophysics (astro-ph), High Energy Physics::Phenomenology, 13. Climate action, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Neutrino
Abstract

The Sudbury Neutrino Observatory (SNO) has measured day and night solar neutrino energy spectra and rates. For charged current events, assuming an undistorted $^8$B spectrum, the night minus day rate is $14.0% \pm 6.3% ^{+1.5}_{-1.4}%$ of the average rate. If the total flux of active neutrinos is additionally constrained to have no asymmetry, the $\nu_e$ asymmetry is found to be $7.0% \pm 4.9% ^{+1.3}_{-1.2}%$. A global solar neutrino analysis in terms of matter-enhanced oscillations of two active flavors strongly favors the Large Mixing Angle (LMA) solution., Comment: 5 pages, 4 figures; very minor revisions, accepted by Physical Review Letters

Published
2002

17. Measurement of CC interactions produced by ${}^8$B solar neutrinos at SNO

Author

H. W. Lee, H. Mes, D. S. McDonald, John Heise, Ilan Levine, J. A. Dunmore, V. M. Novikov, R. U. Haq, Yuen-Dat Chan, J. F. Wilkerson, M. Moorhead, H. S. Ng, J. Cameron, Y. I. Tserkovnyak, Reda Tafirout, A. L. Hallin, E. T.H. Clifford, J. Boger, C. Mifflin, B. T. Cleveland, E. Bonvin, K. McFarlane, Darren Grant, N. Tagg, Christopher C. M. Kyba, C. E. Okada, J. D. Hepburn, S. M. Oser, David A. Sinclair, Hans C. Evans, T. V. Bullard, E. D. Earle, M. C.P. Isaac, R. W. Ollerhead, X. Chen, G. Milton, A. Roberge, N.W. Tanner, J. Lyon, Guthrie Miller, P. Skensved, H. B. Mak, I. Blevis, J. D. Anglin, E. D. Hallman, T. C. Andersen, E. W. Beier, J. H.M. Cowan, R. G. Stokstad, John L. Orrell, Q. R. Ahmad, F. M. Newcomer, C. J. Virtue, E. Saettler, E.D. Frank, Art Mc Donald, W.F. Davidson, Peter Wittich, P. J. Doe, P. Jagam, S. R. Elliott, M. Omori, Herbert H. Chen, G. T. Ewan, K. K. Schaffer, H. Heron, H. Fergani, J. Karn, Y. Dai, R. J. Ford, Klaus Kirch, D. L. Wark, B. A. Moffat, N. Starinsky, R. Heaton, F. A. Duncan, N. McCauley, C. K. Hargrove, J. C. Barton, B. C. Robertson, M. R. Dragowsky, R. K. Taplin, D. F. Cowen, M. G. Boulay, R. L. Hahn, Salvador Gil, F. Dalnoki-Veress, P. T. Trent, A. Goldschmidt, R. S. Storey, G. Doucas, A. S. Hamer, A. D. Marino, A. Knox, N. West, J. R. Leslie, S. D. Biller, R. J. Komar, R. C. Allen, M. W.E. Smith, M. Bercovitch, M. C. Chon, M. O'Neill, M. A. Howe, J. B. Wilhelmy, T. Kutter, R. Meijer Drees, Min Chen, P. J. Harvey, M. Lay, J. Bigu, S. J. Brice, G. McGregor, P. M. Thornewell, W. J. Heintzelman, R. J. Boardman, Richard George Van de Water, G. A. Cox, I. Lawson, T. J. Radcliffe, K. Frame, A. J. Noble, A. W. P. Poon, Malcolm M. Fowler, P. T. Keener, K. T. Lesko, J. J. Simpson, T. J. Bowles, K. M. Heeger, Eric B. Norman, G. Jonkmans, J. M. Wouters, H. Seifert, S. Luoma, A. Schuelke, Minfang Yeh, A. B. McDonald, N. A. Jelley, M. Thorman, A. P. Ferraris, J. X. Wang, V. L. Rusu, K. Cameron, J. G. Hykawy, J. Hewett, Andrew Hime, M. H. Schwendener, W. McLatchie, M. M. Lowry, J. Law, Jochen Klein, J. V. Germani, J. Farine, M. G. Bowler, M. C. Browne, T.H. Burritt, R. A. Black, G. Bühler, A. R. Smith, R. L. Helmer, W. Locke, J. K. Rowley, M. Shatkay, R. Van Berg, C. W. Nally, T. D. Steiger, A. A. Hamian, C. Jillings, Ryuta Hazama, Chris Waltham, S. Majerus, C. A. Duba, R. G. H. Robertson, W. Frati, Bhaskar Sur, Richard T. Kouzes, James R. Wilson, X. Dai, and Mark Neubauer

Subjects
Nuclear physics, Physics, Angular distribution, Solar neutrino, Neutrino oscillation, Charged current
Published
2001

18. Measurement of the Rate ofνe+d→p+p+e−Interactions Produced byB8Solar Neutrinos at the Sudbury Neutrino Observatory

Author

G. Jonkmans, Y. Dai, J. M. Wouters, A. Goldschmidt, M. G. Bowler, J. Boger, M. Shatkay, John L. Orrell, R. G. Stokstad, C. W. Nally, P. Skensved, M. M. Fowler, J. C. Barton, X. Dai, M. C. Browne, Mark Neubauer, C. Jillings, C. A. Duba, B. C. Robertson, R. L. Helmer, Yuen-Dat Chan, P. Jagam, N. W. Tanner, A. L. Hallin, Chris Waltham, C. Mifflin, Steven Elliott, T. Kutter, J. B. Wilhelmy, H. W. Lee, R. Meijer Drees, R. K. Taplin, M. R. Dragowsky, S. M. Oser, K. Frame, R. U. Haq, N. McCauley, C. K. Hargrove, F.M. Newcomer, R. G. H. Robertson, J. D. Anglin, S. J. Brice, J. H.M. Cowan, C. J. Virtue, M. Moorhead, Peter Wittich, I. Blevis, T. C. Andersen, R. Heaton, S. Luoma, K. M. Heeger, F. A. Duncan, A. Schuelke, R. J. Ford, J. Cameron, M. Omori, R. S. Storey, M. A. Howe, Xin Chen, E.D. Frank, K. McFarlane, Minfang Yeh, N. A. Jelley, N. West, M. W.E. Smith, Q. R. Ahmad, Klaus Kirch, R. Van Berg, M. H. Schwendener, P. T. Trent, J. F. Wilkerson, Reda Tafirout, Mark Guy Boulay, Darren Grant, W. McLatchie, G. Milton, W. F. Davidson, J. Heise, J. G. Hykawy, H. Mes, E. T.H. Clifford, N. Tagg, H. S. Ng, J. Law, J. V. Germani, M. O'Neill, R. G. Van de Water, T. D. Steiger, N. Starinsky, R. J. Bardman, R. J. Komar, R. C. Allen, M. L. Chen, M. C. Chon, H. Seifert, J. Hewett, A. A. Hamian, Andrew Hime, J. Karn, I. T. Lawson, C. E. Okada, J. D. Hepburn, T. J. Bowles, W. Locke, J. R. Leslie, Eric B. Norman, David A. Sinclair, B. T. Cleveland, J. Bigu, G. McGregor, G. A. Cox, R. L. Hahn, Salvador Gil, K. Cameron, Alan R. Smith, J. R. Wilson, M. M. Lowry, H. Fergani, T.H. Burritt, J. A. Dunmore, G. Bühler, S. Majerus, S. D. Biller, Hal Evans, Joshua R. Klein, M. Lay, A. B. Knox, P. J. Harvey, D. S. McDonald, W. Frati, Bhaskar Sur, J. K. Rowley, A. S. Hamer, H. B. Mak, P. M. Thornewell, Richard T. Kouzes, J. J. Simpson, G. Doucas, V. M. Novikov, Y. I. Tserkovnyak, G. G. Miller, W. J. Heintzelman, E. D. Earle, P. T. Keener, K. T. Lesko, M. Thorman, J. Farine, M. C.P. Isaac, G. T. Ewan, K. K. Schaffer, R. A. Black, E. D. Hallman, E. Bonvin, A. B. McDonald, Christopher C. M. Kyba, R. Hazama, P. J. Doe, D. L. Wark, T. V. Bullard, A. Roberge, H. Heron, E. Saettler, E. W. Beier, F. Dalnoki-Veress, A. D. Marino, Herbert H. Chen, M. Bercovitch, D. F. Cowen, A. J. Noble, I. Levine, T. J. Radcliffe, A. W. P. Poon, A. P. Ferraris, J. X. Wang, V. L. Rusu, R. W. Ollerhead, J. Lyon, and B. A. Moffat

Subjects
Nuclear reaction, Physics, Particle physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, Solar neutrino, General Physics and Astronomy, Flux, 01 natural sciences, 7. Clean energy, Nuclear physics, Massless particle, 13. Climate action, 0103 physical sciences, Neutrino, 010306 general physics, Charged current, Lepton
Abstract

Solar neutrinos from the decay of 8B have been detected at the Sudbury Neutrino Observatory (SNO) via the charged current (CC) reaction on deuterium and by the elastic scattering (ES) of electrons. The CC reaction is sensitive exclusively to νe, while the ES reaction also has a small sensitivity to νμ and ντ. The flux of νe from 8B decay measured by the CC reaction rate is φCC(ν e )=[1.75±0.07(stat.) −0.11 +0.12 (syst.)×0.05(theor.)]×106cm−2s−1. Assuming no flavor transformation, the flux inferred from the ES reaction rate is φES(ν x )=[2.39±0.34(stat.) −0.14 +0.16 (syst.)]×106cm−2s−1. Comparison of φCC(νe) to the Super-Kamiokande collaboration’s precision value of φES(νx) yields a 3.3σ difference, assuming the systematic uncertainties are normally distributed, providing evidence that there is a nonelectron flavor active neutrino component in the solar flux. The total flux of active 8B neutrinos is thus determined to be (5.44±0.99)×106 cm−2 s−1, in close agreement with the predictions of solar models.

Published
2001

19. Radiative Muon Capture on Hydrogen and the Induced Pseudoscalar Coupling

Author

D. S. Armstrong, G. Jonkmans, B. C. Robertson, M. Munro, T. P. Gorringe, S. C. McDonald, D. G. Sample, P. Gumplinger, A. J. Larabee, M. D. Hasinoff, R. Poutissou, T. von Egidy, J. M. Poutissou, C. Q. Chen, W. Bertl, J. A. Macdonald, D. Healey, G. N. Taylor, E. Saettler, B. Doyle, N. S. Zhang, C. Sigler, P. Depommier, Georges Azuelos, Shama Ahmad, M. Blecher, and D.H. Wright

Subjects
Particle physics, Nuclear Theory, General Physics and Astronomy, FOS: Physical sciences, Elementary particle, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Radiative transfer, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, Coupling constant, Muon, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, 3. Good health, Muon capture, Pseudoscalar, High Energy Physics::Experiment, Lepton
Abstract

The first measurement of the elementary process $\mu^- p \rightarrow \nu_{\mu} n \gamma$ is reported. A photon pair spectrometer was used to measure the partial branching ratio ($2.10 \pm 0.22) \times 10^{-8}$ for photons of k > 60 MeV. The value of the weak pseudoscalar coupling constant determined from the partial branching ratio is $g_p(q^{2}=-0.88m_{\mu}^2) = (9.8 \pm 0.7 \pm 0.3) \cdot g_a(0)$, where the first error is the quadrature sum of statistical and systematic uncertainties and the second error is due to the uncertainty in $\lambda_{op}$, the decay rate of the ortho to para $p \mu p$ molecule. This value of g_p is $\sim$1.5 times the prediction of PCAC and pion-pole dominance., Comment: 13 pages, RevTeX type, 3 figures (encapsulated postscript), submitted to Phys. Rev. Lett

Published
1996
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20. A cylindrical pair spectrometer for the detection of medium energy photons

Author

D. H. Wright, Georges Azuelos, M. D. Hasinoff, Shama Ahmad, J. A. Macdonald, D. G. Sample, T. P. Gorringe, A. Serna-Angel, J. M. Poutissou, C. Q. Chen, B. C. Robertson, N. S. Zhang, D. S. Armstrong, Robert Henderson, M. Blecher, and R. Poutissou

Subjects
Physics, Nuclear physics, Range (particle radiation), Muon, Photon, Spectrometer, Physics::Instrumentation and Detectors, Radiative transfer, Photon energy, Nuclear Experiment, Particle detector, Muon capture
Abstract

A large acceptance, medium energy resolution, cylindrical drift chamber has been constructed for use as a pair spectrometer for the detection of 50 to 100 MeV photons from radiative muon capture. Energy resolution for the detection of 129 MeV photons was found to be 12% (FWHM) at a magnetic field of 2.4 kG and 5.5% at 7.1 kG with the resolution improving as the photon energy decreases. The worst case position resolution for particle tracks is 150 microns (σ). The acceptance for the detection of photons over the range 55–83 MeV was found to be 0.66% at 2.4 kG. All of these properties are reproduced by a Monte Carlo simulation of the spectrometer. Triggering schemes and further chamber characteristics will also be discussed.

Published
1992

21. Radiative muon capture on carbon, oxygen, and calcium

Author

J. A. Macdonald, Shama Ahmad, R. Poutissou, A. J. Larabee, Georges Azuelos, M. Blecher, T. P. Gorringe, J. M. Poutissou, J. Summhammer, T. Numao, B. C. Robertson, M. D. Hasinoff, P. Depommier, E. T. H. Clifford, R. A. Burnham, D. H. Wright, H. Mes, D. S. Armstrong, and Chris Waltham

Subjects
Coupling constant, Nuclear reaction, Physics, Nuclear and High Energy Physics, Branching fraction, chemistry.chemical_element, Weak interaction, Photon energy, Calcium, Oxygen, Spectral line, Atomic and Molecular Physics, and Optics, Muon capture, Nuclear physics, Crystallography, chemistry, Radiative transfer, Atomic physics, Carbon
Abstract

The photon energy spectra from radiative muon capture on {sup 12}C, {sup 16}O, and {sup 40}Ca have been measured using a time projection chamber as a pair spectrometer. The branching ratio for radiative muon capture is sensitive to {ital g}{sub {ital p}}, the induced pseudoscalar coupling constant of the weak interaction. Expressed in terms of the axial-vector weak coupling constant {ital g}{sub {ital a}}, values of {ital g}{sub {ital p}}/{ital g}{sub {ital a}}=5.7{plus minus}0.8 and {ital g}{sub {ital p}}/{ital g}{sub {ital a}}=7.3{plus minus}0.9 are obtained for {sup 40}Ca and {sup 16}O, respectively, from comparison with phenomenological calculations of the nuclear response. From comparison with microscopic calculations, values of {ital g}{sub {ital p}}/{ital g}{sub {ital a}}=4.6{plus minus}1.8, 13.6{sub {minus}1.9}{sup +1.6}, and 16.2{sub {minus}0.7}{sup +1.3} for {sup 40}Ca, {sup 16}O, and {sup 12}C, respectively, are obtained. The microscopic results are suggestive of a renormalization of the nucleonic form factors within the nucleus.

Published
1991

22. Neutron production from thick-target (α, n) reactions

Author

P. Skensved, B. C. Robertson, R. Heaton, and H.W. Lee

Subjects
Nuclear reaction, Baryon, Nuclear physics, Physics, Nuclear and High Energy Physics, Branching fraction, Hadron, Analytical chemistry, Elementary particle, Neutron, Fermion, Nucleon, Instrumentation
Abstract

A set of thick-target neutron yields from the (α, n) reaction has been constructed using available data. Values for the elements with natural isotopic abundances from Z = 3 to 14 and Z = 26 excluding Z = 10 for α-particle energies from 1.0 to 9.8 MeV are presented.

Published
1989

23. The 1377 keV level in 57Co

Author

B. C. Robertson and E.D. Brookes

Subjects
Nuclear physics, Nuclear reaction, Physics, Nuclear and High Energy Physics, symbols.namesake, symbols, Limit (mathematics), Doppler effect
Abstract

The lifetime of the 1377 keV level has been measured using Doppler shift and direct timing techniques. The Doppler shift measurement provided a limit τ > 3 ps and the direct timing measurment gave τ = 27 ± 14ps. The lifetime is compared with the predictions of various models for the structure of 57Co.

Published
1987

24. Characteristics of neutrons from Be targets bombarded with protons, deuterons and alpha particles

Author

B. C. Robertson, A.J. Ferguson, and M.A. Lone

Subjects
Physics, Projectile, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, General Engineering, Cancer therapy, Alpha particle, Nuclear physics, Deuterium, Physics::Accelerator Physics, Neutron source, Neutron, Atomic physics, Nuclear Experiment
Abstract

Thick-target yields and average energies of neutrons emitted at 0° from bombardment of Be with protons and deuterons at energies below 50 MeV and alphas at energies below 30 MeV are given. The minimum projectile energy and current needed to satisfy the requirements of neutron sources for cancer therapy are discussed.

Published
1981

25. Reactionπ−p→γn below theΔresonance

Author

K.A. Aniol, F. Entezami, M. Salomon, A. Bagheri, M. D. Hasinoff, J. M. Poutissou, B. C. Robertson, and David F. Measday

Subjects
Baryon, Physics, Nuclear physics, Nuclear and High Energy Physics, Isospin, Partial wave analysis, Hadron, Resonance, Scattering length, Elementary particle, Atomic physics, Nucleon
Abstract

The reaction ${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$p\ensuremath{\rightarrow}\ensuremath{\gamma}n has been studied at ${T}_{\ensuremath{\pi}}$=45.6, 62.2, 76.4, 91.7, 106.8, and 121.9 MeV for nine laboratory angles between 30\ifmmode^\circ\else\textdegree\fi{} and 140\ifmmode^\circ\else\textdegree\fi{}. The differential cross section measurements have angle to angle errors of about 4% with an additional 3% normalization error. The results are typically a factor of 2 more accurate than previous radiative capture data and are more reliable than cross sections obtained from the reverse reaction \ensuremath{\gamma}d\ensuremath{\rightarrow}${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$${\mathrm{pp}}_{s}$. The data are compared with recent multipole analyses, various calculations, as well as previous data, and the best agreement is with the Tokyo multipole analysis.

Published
1988

26. Background events in the energy region below 4 MeV detected with a 208 cm3 intrinsic germanium detector

Author

P. Jagam, John Campbell, B. C. Robertson, H.L. Malm, and J. J. Simpson

Subjects
Physics, Nuclear and High Energy Physics, Detector, chemistry.chemical_element, Germanium, Radiation, Contamination, Semiconductor detector, Nuclear physics, chemistry, Electromagnetic shielding, Instrumentation, Event (particle physics), Energy (signal processing)
Abstract

A detailed study of the events recorded with a 208 cm 3 intrinsic germanium γ-ray detector produced by interactions of natural environmental radiation was undertaken. In the first part of this work, the data on events from characteristic radioactivity are analysed to optimise the shielding requirements for reducing the γ-ray background as seen by the detector. A thickness of 15 cm of Pb all around the detector in the laboratory location, or only 5 cm in the underground location at the mine, is found to be sufficient to attenuate the event rates from environmental characteristic γ-rays to less than the event rates from intrinsic contamination of the detector components in the detector assembly. The salt mine is found to be a natural environment low in γ-ray background.

Published
1985

27. New Measurement of theπ→eνBranching Ratio

Author

D. Berghofer, T. Numao, A. Olin, Douglas Bryman, R. Dubois, J. A. Macdonald, M. S. Dixit, B. Olaniyi, J. M. Poutissou, and B. C. Robertson

Subjects
Physics, Nuclear physics, Particle decay, Antiparticle, Pion, Positron, Meson, Branching fraction, Hadron, Pi, Analytical chemistry, General Physics and Astronomy
Abstract

A new measurement of the ..pi -->..e..nu.. branching ratio yields GAMMA(..pi -->..e..nu..+..pi -->..e..nu gamma..)/GAMMA(..pi --> mu nu..+..pi --> mu nu.. ..gamma..) = (1.218 +- 0.014) x 10/sup -4./ The measured value is in good agreement with the standard-model prediction incorporating electron-muon universality.

Published
1983

28. Mesic molecular effects in the capture of negative pions stopped in gaseous hydrogen isotopes

Author

H. W. Roser, M. D. Hasinoff, M. Salomon, David F. Measday, A. Bagheri, F. Entezami, B. C. Robertson, K.A. Aniol, Dezso Horvath, C.J. Virtue, and J. M. Stadlbauer

Subjects
Physics, Meson, Proton, Isotope, Hadron, Gaseous hydrogen, Elementary particle, chemistry.chemical_compound, Crystallography, Pion, chemistry, Hydrogen deuteride, Atomic physics, Nuclear Physics
Abstract

The influence of molecular structure on the nuclear capture probability of stopped negative pions has been observed by comparing the ${\ensuremath{\pi}}^{0}$ gamma-ray spectrum from ${\ensuremath{\pi}}^{\ensuremath{-}}$ mesons stopped in HD gas to that from a mixture of equal amounts of ${\mathrm{H}}_{2}$ plus ${\mathrm{D}}_{2}$. The fraction of stopped pions that are captured by a proton in the ${\mathrm{H}}_{2}$+${\mathrm{D}}_{2}$ mixture is ${f}_{{\mathrm{H}}_{2}{\mathrm{D}}_{2}}=0.417\ifmmode\pm\else\textpm\fi{}0.004$, while for HD it is ${f}_{\mathrm{HD}}=0.338\ifmmode\pm\else\textpm\fi{}0.008$, independent of the gas pressure between 6 and 90 atm. The ratio, $\frac{{f}_{{\mathrm{H}}_{2}{\mathrm{D}}_{2}}}{{f}_{\mathrm{HD}}}$, of the fractions is 1.23\ifmmode\pm\else\textpm\fi{}0.03.

Published
1983

29. Bulk Elemental Analysis by the Inelastic Scattering of Neutrons Produced with a Van de Graaff Accelerator

Author

K. M. Barfoot, K. M. Wilson, J. D. MacArthur, B. C. Robertson, S. K. Saha, and Chee-Wai Cheng

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Scattering, Astrophysics::High Energy Astrophysical Phenomena, Particle accelerator, Inelastic scattering, Inelastic neutron scattering, Charged particle, law.invention, Nuclear physics, Nuclear Energy and Engineering, law, Van de Graaff generator, Neutron, Electrical and Electronic Engineering, Atomic physics, Nuclear Experiment
Abstract

Bulk multi-elemental analysis by inelastic neutron scattering with the detection of prompt gamma rays may become an invaluable tool for the non-destructive analysis of rare objects. Various neutron-producing reactions initiated by Van de Graff charged particle beams have been compared for their suitability in multi-elemental analysis. It is concluded that, of the reactions investigated, the 13C(?, n)16O reaction at E? = 3.5 MeV is the most useful for the present applications. Preliminary minimum detection limits are given for fifteen elements.

Published
1981

30. Radiative muon capture on oxygen and the induced pseudoscalar coupling

Author

H. Mes, Georges Azuelos, Chris Waltham, M. Blecher, Shama Ahmad, B. C. Robertson, J. Summhammer, M. D. Hasinoff, D. S. Armstrong, D. H. Wright, T. P. Gorringe, J. A. Macdonald, J. M. Poutissou, P. Depommier, R. Poutissou, A. J. Larabee, E. T. H. Clifford, and R. A. Burnham

Subjects
Nuclear reaction, Pseudoscalar, Physics, Nuclear and High Energy Physics, Branching fraction, Elementary particle, Atomic physics, Coupling (probability), Lepton, Muon capture, Boson, Nuclear Physics
Abstract

The photon spectrum from radiative muon capture in {sup 16}O has been measured using a time projection chamber as a large acceptance pair spectrometer. The integrated partial branching ratio for photons of {ital E}{sub {gamma}}{gt}57 MeV, relative to the ordinary muon capture rate, is (2.2{plus minus}0.2){times}10{sup {minus}5}. When compared to a calculation using a phenomenological nuclear response function the data indicate a value for the induced pseudoscalar coupling in {sup 16}O of {ital g}{sub {ital p}}/g{sub a}=7.3{plus minus}0.9; however, when compared to a microscopic nuclear-model calculation the value {ital g}{sub {ital p}}/g{sub a}=13.6{sub {minus}1.9}{sup +1.6} is obtained.

Published
1989

31. Progress report on muon catalyzed fusion studies in H2+D2 and HD gaseous targets

Author

C.J. Virtue, M. Salomon, D. J. Margaziotis, Steven E. Jones, A. J. Noble, S. Stanislaus, B. C. Robertson, D. Horvath, K. A. Aniol, and David F. Measday

Subjects
Nuclear reaction, Physics, Muon-catalyzed fusion, Muon, Physics::Instrumentation and Detectors, Nuclear physics, chemistry.chemical_compound, chemistry, Nucleosynthesis, Helium-3, High Energy Physics::Experiment, Hydrogen deuteride, Physics::Atomic Physics, Isotopes of helium, Lepton
Abstract

Gamma yields from the decay of the muonic molecule pdμ produced in muon‐catalyzed fusion studies in H2+D2 and HD gaseous targets have been measured. The experiments have been performed at TRIUMF and the data is presented in this report. (AIP)

Published
1988

32. The Sudbury D2O Neutrino Detector

Author

E. D. Earle, A. B. McDonald, B. C. Robertson, W.F. Davidson, R. C. Allen, G. T. Ewan, Herbert H. Chen, E. D. Hallman, H.W. Lee, P. J. Doe, G. Aardsma, P. Jagam, R. S. Storey, A.L. Carter, D. Sinclair, H. B. Mak, D. Kessler, J. J. Simpson, and C. K. Hargrove

Subjects
Physics, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, High Energy Physics::Phenomenology, Solar neutrino problem, Nuclear physics, Cosmic neutrino background, Neutrino detector, Astrophysics::Solar and Stellar Astrophysics, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Neutrino astronomy, Neutrino oscillation
Abstract

The construction of a solar neutrino observatory in a nickel mine near Sudbury, Canada, has been proposed[1]. This proposal is both attractive and timely because of the temporary surplus of over 1000 Mg of D2O stockpiled for the Canadian-designed nuclear power reactors, of the large rock overburden at the INCO mine and of the scientific interest in the solar neutrino flux and neutrino oscillations. The primary objective of the experiment is to measure the incident electron neutrino (νe) spectrum above 5 MeV in real time with energy and directional resolution. It is also expected that the total neutrino (νx) flux above 2.2 MeV can be measured thereby providing important information concerning neutrino oscillations. The observatory will also be a sensitive instrument for measuring neutrinos produced by cosmic rays, solar flares and collapsing stars.

Published
1986

33. A D2O Cerenkov detector for solar neutrinos

Author

E. D. Earle, G. Aardsma, P. J. Doe, D. Kessler, A. B. McDonald, H.H. Chen, R. C. Allen, A.L. Carter, R. S. Storey, H. B. Mak, G. T. Ewan, D. Sinclair, J. J. Simpson, P. Jagam, W.F. Davidson, B. C. Robertson, H.W. Lee, E. D. Hallman, and C. K. Hargrove

Subjects
Physics, Nuclear physics, Neutrino detector, Observatory, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, Detector, Astrophysics::Solar and Stellar Astrophysics, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino astronomy, Neutrino, Solar neutrino problem
Abstract

The construction of a solar neutrino observatory utilizing 1000 Mg of D2O in a nickel mine near Sudbury is proposed. The rationale for such an observatory, the characteristics of the detector and its sensitivity are discussed. Technical details that have been solved and several that remain are outlined. Technical measurements and designs are in progress with a view to preparing detailed costing estimates.

Published
1986

34. The Guelph 76Ge double β-decay experiment

Author

B. C. Robertson, John Campbell, P. Jagam, I. Bostock, H.L. Malm, J. J. Simpson, and J. Law

Subjects
Physics, Nuclear physics, Double beta decay, Background radiation
Abstract

The status of the development of the Guelph 76−Ge double beta decay experiment is given. (AIP)

Published
1984

35. 39K 2.82 MeV Level

Author

B. C. Robertson

Subjects
Nuclear physics, Physics, General Physics and Astronomy, Radiation, Atomic physics
Abstract

Experimental M2 and E3 radiation widths for the 2.82 MeV level in 39K are obtained from available data and compared with theoretical predictions. It is shown that a large collective octupole admixture is not necessary to reproduce the E3 width and an inhibited M2 width is indicated, which is most likely due to the presence of 2 particle–3 hole components in the ground-state wave function.

Published
1971

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