Publications by Steve Biller


Probing Majorana neutrinos in the regime of the normal mass hierarchy

PHYSICAL REVIEW D 87 (2013) ARTN 071301

SD Biller


LOW-MULTIPLICITY BURST SEARCH AT THE SUDBURY NEUTRINO OBSERVATORY

ASTROPHYSICAL JOURNAL 728 (2011) ARTN 83

B Aharmim, SN Ahmed, AE Anthony, N Barros, EW Beier, A Bellerive, B Beltran, M Bergevin, SD Biller, K Boudjemline, MG Boulay, B Cai, YD Chan, D Chauhan, M Chen, BT Cleveland, X Dai, H Deng, J Detwiler, G Doucas, P-L Drouin, FA Duncan, M Dunford, ED Earle, SR Elliott, HC Evans, GT Ewan, J Farine, H Fergani, F Fleurot, RJ Ford, JA Formaggio, N Gagnon, JTM Goon, K Graham, E Guillian, S Habib, RL Hahn, AL Hallin, ED Hallman, PJ Harvey, R Hazama, WJ Heintzelman, J Heise, RL Helmer, A Hime, C Howard, M Huang, B Jamieson, NA Jelley, M Jerkins, JR Klein, M Kos, C Kraus, CB Krauss, T Kutter, CCM Kyba, J Law, KT Lesko, JR Leslie, JC Loach, R MacLellan, S Majerus, HB Mak, J Maneira, R Martin, N McCauley, AB McDonald, ML Miller, B Monreal, J Monroe, BG Nickel, AJ Noble, HM O'Keeffe, NS Oblath, GDO Gann, SM Oser, RA Ott, SJM Peeters, AWP Poon, G Prior, SD Reitzner, K Rielage, BC Robertson, RGH Robertson, MH Schwendener, JA Secrest, SR Seibert, O Simard, JJ Simpson, D Sinclair, P Skensved, TJ Sonley, LC Stonehill, G Tesic, N Tolich, T Tsui, R Van Berg, BA VanDevender, CJ Virtue, HWC Tseung, PJS Watson, N West, JF Wilkerson, JR Wilson, A Wright, M Yeh, F Zhang, K Zuber, SNO Collaboration


Low-multiplicity burst search at the Sudbury neutrino Observatory

Astrophysical Journal Letters 728 (2011)

B Aharmim, D Chauhan, J Farine, F Fleurot, ED Hallman, M Huang, C Kraus, MH Schwendener, CJ Virtue, SN Ahmed, K Boudjemline, MG Boulay, B Cai, M Chen, X Dai, FA Duncan, ED Earle, HC Evans, GT Ewan, RJ Ford, K Graham, E Guillian, PJ Harvey, J Heise, M Kos, JR Leslie, R MacLellan, HB Mak, R Martin, AB McDonald, AJ Noble, BC Robertson, P Skensved, A Wright, AE Anthony, M Jerkins, JR Klein, SR Seibert, N Barros, J Maneira, EW Beier, H Deng, M Dunford, WJ Heintzelman, CCM Kyba, N McCauley, GD Orebi Gann, JA Secrest, R Van Berg, A Bellerive, P-L Drouin, O Simard, D Sinclair, G Tešić, PJS Watson, F Zhang, B Beltran, S Habib, AL Hallin, C Howard, CB Krauss, M Bergevin, J Law, BG Nickel, SD Reitzner, JJ Simpson, YD Chan, J Detwiler, N Gagnon, KT Lesko, JC Loach, AWP Poon, G Prior, SD Biller, BT Cleveland, G Doucas, H Fergani, NA Jelley, S Majerus, HM O'keeffe, SJM Peeters, H Wan Chan Tseung, N West, JR Wilson, K Zuber, SR Elliott, A Hime, K Rielage, LC Stonehill, JA Formaggio, R Hazama, ML Miller, NS Oblath, RGH Robertson, N Tolich, BA Van Devender, JF Wilkerson, B Monreal, J Monroe, RA Ott, TJ Sonley, JTM Goon, T Kutter, RL Hahn, M Yeh, B Jamieson, SM Oser, T Tsui, RL Helmer

Results are reported from a search for low-multiplicity neutrino bursts in the Sudbury Neutrino Observatory. Such bursts could indicate the detection of a nearby core-collapse supernova explosion. The data were taken from Phase I (1999 November-2001 May), when the detector was filled with heavy water, and Phase II (2001 July-2003 August), when NaCl was added to the target. The search was a blind analysis in which the potential backgrounds were estimated and analysis cuts were developed to eliminate such backgrounds with 90% confidence before the data were examined. The search maintained a greater than 50% detection probability for standard supernovae occurring at a distance of up to 60 kpc for Phase I and up to 70 kpc for Phase II. No low-multiplicity bursts were observed during the data-taking period. © 2011. The American Astronomical Society. All rights reserved. Printedin the U.S.A.


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

Physical Review C - Nuclear Physics 81 (2010)

B Aharmim, SN Ahmed, AE Anthony, N Barros, EW Beier, A Bellerive, B Beltran, M Bergevin, SD Biller, K Boudjemline, MG Boulay, TH Burritt, B Cai, YD Chan, D Chauhan, M Chen, BT Cleveland, GA Cox, X Dai, H Deng, J Detwiler, M Dimarco, PJ Doe, G Doucas, PL Drouin, CA Duba, FA Duncan, M Dunford, ED Earle, SR Elliott, HC Evans, GT Ewan, J Farine, H Fergani, F Fleurot, RJ Ford, JA Formaggio, N Gagnon, JT Goon, K Graham, E Guillian, S Habib, RL Hahn, AL Hallin, ED Hallman, PJ Harvey, R Hazama, WJ Heintzelman, J Heise, RL Helmer, A Hime, C Howard, MA Howe, M Huang, B Jamieson, NA Jelley, KJ Keeter, JR Klein, LL Kormos, M Kos, C Kraus, CB Krauss, T Kutter, CCM Kyba, J Law, IT Lawson, KT Lesko, JR Leslie, I Levine, JC Loach, R MacLellan, S Majerus, HB Mak, J Maneira, R Martin, N McCauley

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 B8 decay in the Sun measured using the neutral current (NC) reaction of neutrinos on deuterons, with no constraint on the B8 neutrino energy spectrum, is found to be ΦNC=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 B8 neutrino flux and the energy-dependent νe survival probability provides a measure of the total B8 neutrino flux Φ8B=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 θ12=34.06-0.84+1.16 degrees and Δm212=7.59-0. 21+0.20×10 - 5 eV2. The global value of Φ8B is extracted to a precision of -2.95+2.38%. In a three-flavor analysis the best fit value of sin2θ13 is 2.00-1.63+2.09×10 - 2. This implies an upper bound of sin2θ13 < 0.057 (95% C.L.). © 2010 The American Physical Society.


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

PHYSICAL REVIEW C 81 (2010) ARTN 055504

B Aharmim, SN Ahmed, AE Anthony, N Barros, EW Beier, A Bellerive, B Beltran, M Bergevin, SD Biller, K Boudjemline, MG Boulay, TH Burritt, B Cai, YD Chan, D Chauhan, M Chen, BT Cleveland, GA Cox, X Dai, H Deng, J Detwiler, M DiMarco, PJ Doe, G Doucas, P-L Drouin, CA Duba, FA Duncan, M Dunford, ED Earle, SR Elliott, HC Evans, GT Ewan, J Farine, H Fergani, F Fleurot, RJ Ford, JA Formaggio, N Gagnon, JT Goon, K Graham, E Guillian, S Habib, RL Hahn, AL Hallin, ED Hallman, PJ Harvey, R Hazama, WJ Heintzelman, J Heise, RL Helmer, A Hime, C Howard, MA Howe, M Huang, B Jamieson, NA Jelley, KJ Keeter, JR Klein, LL Kormos, M Kos, C Kraus, CB Krauss, T Kutter, CCM Kyba, J Law, IT Lawson, KT Lesko, JR Leslie, I Levine, JC Loach, R MacLellan, S Majerus, HB Mak, J Maneira, R Martin, N McCauley, AB McDonald, S McGee, ML Miller, B Monreal, J Monroe, B Morissette, BG Nickel, AJ Noble, HM O'Keeffe, NS Oblath, GDO Gann, SM Oser, RA Ott, SJM Peeters, AWP Poon, G Prior, SD Reitzner, K Rielage, BC Robertson, RGH Robertson, MH Schwendener, JA Secrest, SR Seibert, O Simard, D Sinclair, P Skensved, TJ Sonley, LC Stonehill, G Tesic, N Tolich, T Tsui, CD Tunnell, R Van Berg, BA VanDevender, CJ Virtue, BL Wall, D Waller, HWC Tseung, DL Wark, N West, JF Wilkerson, JR Wilson, JM Wouters, A Wright, M Yeh, F Zhang, K Zuber, SNO Collaboration


SEARCHES FOR HIGH-FREQUENCY VARIATIONS IN THE B-8 SOLAR NEUTRINO FLUX AT THE SUDBURY NEUTRINO OBSERVATORY

ASTROPHYSICAL JOURNAL 710 (2010) 540-548

B Aharmim, SN Ahmed, AE Anthony, N Barros, EW Beier, A Bellerive, B Beltran, M Bergevin, SD Biller, K Boudjemline, MG Boulay, TH Burritt, B Cai, YD Chan, D Chauhan, M Chen, BT Cleveland, GA Cox, X Dai, H Deng, J Detwiler, M DiMarco, PJ Doe, G Doucas, P-L Drouin, CA Duba, FA Duncan, M Dunford, ED Earle, SR Elliott, HC Evans, GT Ewan, J Farine, H Fergani, F Fleurot, RJ Ford, JA Formaggio, N Gagnon, JTM Goon, K Graham, E Guillian, S Habib, RL Hahn, AL Hallin, ED Hallman, PJ Harvey, R Hazama, WJ Heintzelman, J Heise, RL Helmer, A Hime, C Howard, MA Howe, M Huang, B Jamieson, NA Jelley, KJ Keeter, JR Klein, LL Kormos, M Kos, C Kraus, CB Krauss, T Kutter, CCM Kyba, J Law, IT Lawson, KT Lesko, JR Leslie, I Levine, JC Loach, R MacLellan, S Majerus, HB Mak, J Maneira, R Martin, N McCauley, AB McDonald, S McGee, ML Miller, B Monreal, J Monroe, B Morissette, BG Nickel, AJ Noble, HM O'Keeffe, NS Oblath, GDO Gann, SM Oser, RA Ott, SJM Peeters, AWP Poon, G Prior, SD Reitzner, K Rielage, BC Robertson, RGH Robertson, MH Schwendener, JA Secrest, SR Seibert, O Simard, D Sinclair, P Skensved, TJ Sonley, LC Stonehill, G Tesic, N Tolich, T Tsui, CD Tunnell, R Van Berg, BA VanDevender, CJ Virtue, BL Wall, D Waller, HWC Tseung, DL Wark, PJS Watson, N West, JF Wilkerson, JR Wilson, JM Wouters, A Wright, M Yeh, F Zhang, K Zuber


Searches for high-frequency variations in the<sup>8</sup>B solar neutrino flux at the sudbury neutrino observatory

Astrophysical Journal 710 (2010) 540-548

B Aharmim, SN Ahmed, AE Anthony, N Barros, EW Beier, A Bellerive, B Beltran, M Bergevin, SD Biller, K Boudjemline, MG Boulay, TH Burritt, B Cai, YD Chan, D Chauhan, M Chen, BT Cleveland, GA Cox, X Dai, H Deng, J Detwiler, M Dimarco, PJ Doe, G Doucas, PL Drouin, CA Duba, FA Duncan, M Dunford, ED Earle, SR Elliott, HC Evans, GT Ewan, J Farine, H Fergani, F Fleurot, RJ Ford, JA Formaggio, N Gagnon, JT Goon, K Graham, E Guillian, S Habib, RL Hahn, AL Hallin, ED Hallman, PJ Harvey, R Hazama, WJ Heintzelman, J Heise, RL Helmer, A Hime, C Howard, MA Howe, M Huang, B Jamieson, NA Jelley, KJ Keeter, JR Klein, LL Kormos, M Kos, C Kraus, CB Krauss, T Kutter, CCM Kyba, J Law, IT Lawson, KT Lesko, JR Leslie, I Levine, JC Loach, R MacLellan, S Majerus, HB Mak, J Maneira, R Martin, N McCauley

We have performed three searches for high-frequency signals in the solar neutrino flux measured by the Sudbury Neutrino Observatory, motivated by the possibility that solar g-mode oscillations could affect the production or propagation of solar 8 B neutrinos. The first search looked for any significant peak in the frequency range 1-144day -1 , with a sensitivity to sinusoidal signals with amplitudes of 12% or greater. The second search focused on regions in which g-mode signals have been claimed by experiments aboard the Solar and Heliospheric Observatory satellite, and was sensitive to signals with amplitudes of 10% or greater. The third search looked for extra power across the entire frequency band. No statistically significant signal was detected in any of the three searches. © 2010. The American Astronomical Society.


Measurement of the cosmic ray and neutrino-induced muon flux at the Sudbury neutrino observatory

Physical Review D - Particles, Fields, Gravitation and Cosmology 80 (2009)

B Aharmim, SN Ahmed, TC Andersen, AE Anthony, N Barros, EW Beier, A Bellerive, B Beltran, M Bergevin, SD Biller, K Boudjemline, MG Boulay, TH Burritt, B Cai, YD Chan, M Chen, MC Chon, BT Cleveland, GA Cox-Mobrand, CA Currat, X Dai, F Dalnoki-Veress, H Deng, J Detwiler, PJ Doe, RS Dosanjh, G Doucas, PL Drouin, FA Duncan, M Dunford, SR Elliott, HC Evans, GT Ewan, J Farine, H Fergani, F Fleurot, RJ Ford, JA Formaggio, N Gagnon, JTM Goon, K Graham, DR Grant, E Guillian, S Habib, RL Hahn, AL Hallin, ED Hallman, CK Hargrove, PJ Harvey, R Hazama, KM Heeger, WJ Heintzelman, J Heise, RL Helmer, RJ Hemingway, R Henning, A Hime, C Howard, MA Howe, M Huang, B Jamieson, NA Jelley, JR Klein, M Kos, A Krüger, C Kraus, CB Krauss, T Kutter, CCM Kyba, R Lange, J Law, IT Lawson

Results are reported on the measurement of the atmospheric neutrino-induced muon flux at a depth of 2 kilometers below the Earth's surface from 1229 days of operation of the Sudbury Neutrino Observatory (SNO). By measuring the flux of through-going muons as a function of zenith angle, the SNO experiment can distinguish between the oscillated and unoscillated portion of the neutrino flux. A total of 514 muonlike events are measured between -1≤cos θzenith≤0.4 in a total exposure of 2.30×1014cm2s. The measured flux normalization is 1.22±0.09 times the Bartol three-dimensional flux prediction. This is the first measurement of the neutrino-induced flux where neutrino oscillations are minimized. The zenith distribution is consistent with previously measured atmospheric neutrino oscillation parameters. The cosmic ray muon flux at SNO with zenith angle cos θzenith > 0.4 is measured to be (3.31±0.01(stat)±0.09(sys))×10-10μ/s/cm2. © 2009 The American Physical Society.


Measurement of the cosmic ray and neutrino-induced muon flux at the Sudbury neutrino observatory

PHYSICAL REVIEW D 80 (2009) ARTN 012001

B Aharmim, SN Ahmed, TC Andersen, AE Anthony, N Barros, EW Beier, A Bellerive, B Beltran, M Bergevin, SD Biller, K Boudjemline, MG Boulay, TH Burritt, B Cai, YD Chan, M Chen, MC Chon, BT Cleveland, GA Cox-Mobrand, CA Currat, X Dai, F Dalnoki-Veress, H Deng, J Detwiler, PJ Doe, RS Dosanjh, G Doucas, P-L Drouin, FA Duncan, M Dunford, SR Elliott, HC Evans, GT Ewan, J Farine, H Fergani, F Fleurot, RJ Ford, JA Formaggio, N Gagnon, JTM Goon, K Graham, DR Grant, E Guillian, S Habib, RL Hahn, AL Hallin, ED Hallman, CK Hargrove, PJ Harvey, R Hazama, KM Heeger, WJ Heintzelman, J Heise, RL Helmer, RJ Hemingway, R Henning, A Hime, C Howard, MA Howe, M Huang, B Jamieson, NA Jelley, JR Klein, M Kos, A Krueger, C Kraus, CB Krauss, T Kutter, CCM Kyba, R Lange, J Law, IT Lawson, KT Lesko, JR Leslie, I Levine, JC Loach, S Luoma, R MacLellan, S Majerus, HB Mak, J Maneira, AD Marino, R Martin, N McCauley, AB McDonald, S McGee, C Mifflin, ML Miller, B Monreal, J Monroe, AJ Noble, NS Oblath, CE Okada, HM O'Keeffe, Y Opachich, GDO Gann, SM Oser, RA Ott, SJM Peeters, AWP Poon, G Prior, K Rielage, BC Robertson, RGH Robertson, E Rollin, MH Schwendener, JA Secrest, SR Seibert, O Simard, JJ Simpson, D Sinclair, P Skensved, MWE Smith, TJ Sonley, TD Steiger, LC Stonehill, N Tagg, G Tesic, N Tolich, T Tsui, RG Van de Water, BA VanDevender, CJ Virtue, D Waller, CE Waltham, HWC Tseung, DL Wark, P Watson, J Wendland, N West, JF Wilkerson, JR Wilson, JM Wouters, A Wright, M Yeh, F Zhang, K Zuber


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

Phys Rev Lett 101 (2008) 111301-

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

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


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

Physical Review C - Nuclear Physics 75 (2007)

B Aharmim, QR Ahmad, SN Ahmed, RC Allen, TC Andersen, JD Anglin, G Bühler, JC Barton, EW Beier, M Bercovitch, M Bergevin, J Bigu, SD Biller, RA Black, I Blevis, RJ Boardman, J Boger, E Bonvin, MG Boulay, MG Bowler, TJ Bowles, SJ Brice, MC Browne, TV Bullard, TH Burritt, J Cameron, YD Chan, HH Chen, M Chen, X Chen, BT Cleveland, JHM Cowan, DF Cowen, GA Cox, CA Currat, X Dai, F Dalnoki-Veress, WF Davidson, H Deng, M Dimarco, PJ Doe, G Doucas, MR Dragowsky, CA Duba, FA Duncan, M Dunford, JA Dunmore, ED Earle, SR Elliott, HC Evans, GT Ewan, J Farine, H Fergani, AP Ferraris, F Fleurot, RJ Ford, JA Formaggio, MM Fowler, K Frame, ED Frank, W Frati, N Gagnon, JV Germani, S Gil, A Goldschmidt, JTM Goon, K Graham, DR Grant, E Guillian, RL Hahn, AL Hallin, ED Hallman, AS Hamer, AA Hamian, WB Handler, RU Haq, CK Hargrove, PJ Harvey, R Hazama, KM Heeger, WJ Heintzelman, J Heise, RL Helmer, R Henning

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.


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

PHYSICAL REVIEW C 75 (2007) ARTN 045502

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


Extending the Sensitivity of Air Cerenkov Telescopes

Astroparticle Physics 26 (2006) 69-90

SD Biller, I. de la Calle Perez


A search for neutrinos from the solar hep reaction and the diffuse supernova neutrino background with the Sudbury Neutrino Observatory

ASTROPHYSICAL JOURNAL 653 (2006) 1545-1551

B Aharmim, SN Ahmed, AE Anthony, EW Beier, A Bellerive, M Bergevin, SD Biller, MG Boulay, YD Chan, M Chen, X Chen, BT Cleveland, GA Cox, CA Currat, X Dai, F Dalnoki-Veress, H Deng, J Detwiler, M DiMarco, PJ Doe, G Doucas, P-L Drouin, FA Duncan, M Dunford, JA Dunmore, ED Earle, HC Evans, GT Ewan, J Farine, H Fergani, F Fleurot, RJ Ford, JA Formaggio, N Gagnon, JT Goon, K Graham, E Guillian, RL Hahn, AL Hallin, ED Hallman, PJ Harvey, R Hazama, KM Heeger, WJ Heintzelman, J Heise, RL Helmer, RJ Hemingway, R Henning, A Hime, C Howard, MA Howe, M Huang, P Jagam, NA Jelley, JR Klein, LL Kormos, M Kos, A Kruger, C Kraus, CB Krauss, T Kutter, CCM Kyba, H Labranche, R Lange, J Law, IT Lawson, KT Lesko, JR Leslie, JC Loach, S Luoma, R MacLellan, S Majerus, HB Mak, J Maneira, AD Marino, R Martin, N McCauley, AB McDonald, S McGee, C Mifflin, KKS Miknaitis, ML Miller, B Monreal, BG Nickel, AJ Noble, EB Norman, NS Oblath, CE Okada, HM O'Keeffe, GDO Gann, SM Oser, R Ott, SJM Peeters, AWP Poon, G Prior, K Rielage, BC Robertson, RGH Robertson, E Rollin, MH Schwendener, JA Secrest, SR Seibert, O Simard, CJ Sims, D Sinclair, P Skensved, RG Stokstad, LC Stonehill, G Tesic, N Tolich, T Tsui, R Van Berg, RG Van de Water, BA VanDevender, CJ Virtue, TJ Walker, BL Wall, D Waller, HWC Tseung, DL Wark, J Wendland, N West, JF Wilkerson, JR Wilson, JM Wouters, A Wright, M Yeh, F Zhang, K Zuber


A search for neutrinos from the solar hep reaction and the diffuse supernova neutrino background with the Sudbury Neutrino Observatory

Astrophysical Journal 653 (2006) 1545-1551

B Aharmim, SN Ahmed, AE Anthony, EW Beier, A Bellerive, M Bergevin, SD Biller, MG Boulay, YD Chan, M Chen, X Chen, BT Cleveland, GA Cox, CA Currat, X Dai, F Dalnoki-Veress, H Deng, J Detwiler, M DiMarco, PJ Doe, G Doucas, PL Drouin, FA Duncan, M Dunford, JA Dunmore, ED Earle, HC Evans, GT Ewan, J Farine, H Fergani, F Fleurot, RJ Ford, JA Formaggio, N Gagnon, JT Goon, K Graham, E Guillian, RL Hahn, AL Hallin, ED Hallman, PJ Harvey, R Hazama, KM Heeger, WJ Heintzelman, J Heise, RL Helmer, RJ Hemingway, R Henning, A Hlme, C Howard, MA Howe, M Huang, P Jagam, NA Jelley, JR Klein, LL Kormos, M Kos, A Krüger, C Kraus, CB Krauss, T Kutter, CCM Kyba, H Labranche, R Lange, J Law, IT Lawson, KT Lesko, JR Leslie, JC Loach, S Luoma, R MacLellan, S Majerus, HB Mak, J Maneira, AD Marino, R Martin, N McCauley, AB McDonald, S McGee, C Mifflin, KKS Miknaitis

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 ktons yr. For the hep neutrino search, two events are observed in the effective electron energy range of 14.3 MeV < T eff < 20 MeV, where 3.1 background events are expected. After accounting for neutrino oscillations, an upper limit of 2.3 × 10 4 cm -2 s -1 at the 90% 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 < T eff < 35 MeV, and, consequently, an upper limit on the ν e component of the DSNB flux in the neutrino energy range of 22.9 MeV < E ν < 36.9 MeVof 70 cm -2 s -1 is inferred at the 90% 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 2 orders of magnitude on the previous upper limit on the ν e component of the DSNB flux. © 2006. The American Astronomical Society. All rights reserved.


Performance study of a wide-angle camera for atmospheric Cerenkov telescopes

AIP CONF PROC 745 (2005) 742-747

I de la Calle, SD Biller

With the next generation of Atmospheric Cerenkov Telescopes (ACT) well on their way, effort has being shifted now towards a further improvement of the capabilities of these instruments. These next generation experiments have improved up to an order of magnitude their sensitivity over their first generation Counterparts. and have extended the energy coverage down to about 50 GeV. However, it is not clear whether the same approach is optimal for energies above 1 TcV. and with clear evidence of high energy emission above this energy from several astrophysical sources, we believe that this energy range could be further exploited. Many of our physics goals, such as, limits on quantum gravity or spectral variability and features of the high energy emission from AGNs. would benefit from an increase of sensitivity in this direction. Here, we investigate a possible way of increasing the collection area of ACTs above 1 TeV by using a wide-field-of-view (similar to 10 degrees) camera. Both, the scientific motivation and preliminary Monte Carlo Studies of the performance of such a detector, are discussed and presented here.


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

PHYSICAL REVIEW D 72 (2005) ARTN 052010

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


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

Physical Review D - Particles, Fields, Gravitation and Cosmology 72 (2005)

B Aharmim, SN Ahmed, AE Anthony, EW Beier, A Bellerive, M Bergevin, SD Biller, MG Boulay, MG Bowler, YD Chan, M Chen, X Chen, BT Cleveland, T Costin, GA Cox, CA Currat, X Dai, H Deng, J Detwiler, PJ Doe, RS Dosanjh, G Doucas, CA Duba, FA Duncan, M Dunford, JA Dunmore, ED Earle, SR Elliott, HC Evans, GT Ewan, J Farine, H Fergani, F Fleurot, JA Formaggio, W Frati, BG Fulsom, N Gagnon, JTM Goon, K Graham, RL Hahn, AL Hallin, ED Hallman, WB Handler, CK Hargrove, PJ Harvey, R Hazama, KM Heeger, L Heelan, WJ Heintzelman, J Heise, RL Helmer, RJ Hemingway, A Hime, MA Howe, M Huang, E Inrig, P Jagam, NA Jelley, JR Klein, LL Kormos, MS Kos, A Krüger, C Kraus, CB Krauss, AV Krumins, T Kutter, CCM Kyba, H Labranche, R Lange, J Law, IT Lawson, KT Lesko, JR Leslie, I Levine, JC Loach, S Luoma, R MacLellan, S Majerus, J Maneira, AD Marino, N McCauley, AB McDonald, S McGee, C Mifflin, KKS Miknaitis, BG Nickel, AJ Noble, EB Norman, NS Oblath, CE Okada, HM O'Keeffe, RW Ollerhead, GDO Gann

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.


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

Physical Review C - Nuclear Physics 72 (2005)

B Aharmim, SN Ahmed, AE Anthony, EW Beier, A Bellerive, M Bergevin, SD Biller, J Boger, MG Boulay, MG Bowler, TV Bullard, YD Chan, M Chen, X Chen, BT Cleveland, GA Cox, CA Currat, X Dai, F Dalnoki-Veress, H Deng, PJ Doe, RS Dosanjh, G Doucas, CA Duba, FA Duncan, M Dunford, JA Dunmore, ED Earle, SR Elliott, HC Evans, GT Ewan, J Farine, H Fergani, F Fleurot, JA Formaggio, K Frame, W Frati, BG Fulsom, N Gagnon, K Graham, DR Grant, RL Hahn, JC Hall, AL Hallin, ED Hallman, WB Handler, CK Hargrove, PJ Harvey, R Hazama, KM Heeger, L Heelan, WJ Heintzelman, J Heise, RL Helmer, RJ Hemingway, A Hime, C Howard, MA Howe, M Huang, P Jagam, NA Jelley, JR Klein, LL Kormos, MS Kos, A Krüger, C Kraus, CB Krauss, AV Krumins, T Kutter, CCM Kyba, H Labranche, R Lange, J Law, IT Lawson, KT Lesko, JR Leslie, I Levine, JC Loach, S Luoma, R MacLellan, S Majerus, HB Mak, J Maneira, AD Marino, N McCauley, AB McDonald, S McGee, G McGregor, C Mifflin, KKS Miknaitis

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.


Measurement of the total active 8B solar neutrino flux at the Sudbury Neutrino Observatory with enhanced neutral current sensitivity

Physical Review Letters 92 (2004) article 181301 6 pages-

NA Jelley, S.N.Ahmed, A.E.Anthony, E.W.Beier

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