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Your search keyword '"Wilkerson, J.F."' showing total 7 results
Start Over Author "Wilkerson, J.F." Publisher escholarship, university of california
7 results on '"Wilkerson, J.F."'

1. An array of low-background 3He proportional counters for the Sudbury Neutrino Observatory

Author

Amsbaugh, J.F., Anaya, J.M., Banar, J., Bowles, T.J., Browne, M.C., Bullard, T.V., Burritt, T.H., Cox-Mobrand, G.A., Dai, X., H.Deng, X., Di Marco, M., Doe, P.J., Dragowsky, M.R., Duba, C.A., Duncan, F.A., Earle, E.D., Elliott, S.R., Esch, E.-I., Fergani, H., Formaggio, J.A., Fowler, M.M., Franklin, J.E., Geissbuehler, P., Germani, J.V., Goldschmidt, A., Guillian, E., Hallin, A.L., Harper, G., Harvey, P.J., Hazama, R., Heeger, K.M., Heise, J., Hime, A., Howe, M.A., Huang, M., Kormos, L.L., Kraus, C., Krauss, C.B., Law, J., Lawson, I.T., Lesko, K.T., Loach, J.C., Majerus, S., Manor, J., McGee, S., Miknaitis, K.K.S., Miller, G.G., Morissette, B., Myers, A., Oblath, N.S., O'Kee, H.M., Ollerhead, R.W., Peeters, S.J.M., Poon, A.W.P., Prior, G., Reitzner, S.D., Rielage, K., Robertson, R.G.H., Skensved, P., Smith, A.R., Smith, M.W.E., Steiger, T.D., Stonehill, L.C., Thornewell, P.M., Tolich, N., VanDevender, B.A., VanWechel, T.D., Wall, B.L., Tseung, H.W.C., Wendland, J., West, N., Wilhelmy, J.B., Wilkerson, J.F., and Wouters, J.M.

Abstract

An array of Neutral-Current Detectors (NCDs) has been built in order to make a unique measurement of the total active ux of solar neutrinos in the Sudbury Neutrino Observatory (SNO). Data in the third phase of the SNO experiment were collected between November 2004 and November 2006, after the NCD array was added to improve the neutral-current sensitivity of the SNO detector. This array consisted of 36 strings of proportional counters lled with a mixture of 3He and CF4 gas capable of detecting the neutrons liberated by the neutrino-deuteron neutral current reaction in the D2O, and four strings lled with a mixture of 4He and CF4 gas for background measurements. The proportional counter diameter is 5 cm. The total deployed array length was 398 m. The SNO NCD array is the lowest-radioactivity large array of proportional counters ever produced. This article describes the design, construction, deployment, and characterization of the NCD array, discusses the electronics and data acquisition system, and considers event signatures and backgrounds.

Published
2008

2. The Sudbury Neutrino Observatory and the Solar Neutrino Problem

Author

Lesko, K.T., Chan, Y.D., Garcia, A., Norman, E.B., Smith, A.R., Stokstad, R.G., Zlimen, I., Evans, H.C., Ewan, G.T., Hillin, A., Lee, H.W., Leslie, J.R., MacArthur, J.D., Mak, H.B., McDonald, A.B., McLatchie, W., Robertson, B.C., Skensved, P., Sur, B., Bonvin, E., Earle, E.D., Hepburn, D., Milton, G.M., Blevis, I., Davidson, W.F., Hargrove, C.K., Mex, H., Shatkay, M., Sinclair, D., Carter, A.L., Hollebone, B., Kessler, D., Jagam, P., Law, J., Ollerhead, R.W., Simpson, J.J., Wang, J.-X., Bigu, J., Hallman, E.D., Haq, R.U., Virtue, C., Gil, S., Waltham, C., Lowry, M.M., Beier, E.W., Frati, W., Newcomer, M., Berg, R. Ban, Bowles, T.J., Doe, P., Fowler, M.M., Hime, A., McGirt, F., Robertson, R.G.H., Spencer, T.C., Vieira, D.J., Wilhelmy, J.B., Wilkerson, J.F., Wouters, J.M., Tanner, N.W., Jelley, N.A., Barton, J.C., Doucas, G., Hooper, E.W., Knox, A.B., Morehead, M.E., Omori, M., Trent, P.T., and Wark, D.L.

Published
1993

3. Search for double- β decay of Ge 76 to excited states of Se 76 with the majorana demonstrator

Author

Varner, R.L., Elliott, S.R., Ruof, N.W., Gilliss, T., Busch, M., Chu, P.-H., Reine, A.L., Guinn, I.S., Stortini, M.J., Tedeschi, D., Saykl, B., Giovanetti, G.K., Efremenko, Y., Blalock, E., Wilkerson, J.F., Vasilyev, S., Myslik, J., Zhu, B.X., Xu, W., Christofferson, C.D., Buuck, M., Hostiuc, A., Kouzes, R.T., Lopez, A.M., Martin, R.D., Wiseman, C., Barabash, A.S., Kidd, M.F., López-Castaño, J.M., Edwards, T.R., Green, M.P., Ejiri, H., Gruszko, J., Martin, E.L., Othman, G., Paudel, L.S., Meijer, S.J., Bos, B., Yu, C.-H., Chan, Y.-D., Massarczyk, R., Guiseppe, V.E., Detwiler, J.A., Rielage, K., Bertrand, F.E., Hervas Aguilar, D., Kim, I., Hegedus, R.J., Avignone, F.T., III, Poon, A.W.P., Caldwell, T.S., Mertens, S., Oli, T.K., Cuesta, C., Drobizhev, A., Barton, C.J., Haufe, C.R., Pettus, W., Hoppe, E.W., Arnquist, I.J., Clark, M.L., Radford, D.C., and Edwins, D.W.

Abstract

The majorana demonstrator is a neutrinoless double-β decay search consisting of a low-background modular array of high-purity germanium detectors, ∼2/3 of which are enriched to 88% in Ge76. The experiment is also searching for double-beta decay of Ge76 to excited states (e.s.) in Se76. Ge76 can decay into three daughter states of Se76, with clear event signatures consisting of a ββ-decay followed by the prompt emission of one or two γ rays. This results with high probability in multi-detector coincidences. The granularity of the demonstrator detector array enables powerful discrimination of this event signature from backgrounds. Using 41.9 kg yr of isotopic exposure, the demonstrator has set world leading limits for each e.s. decay of Ge76, with 90% CL lower half-life limits in the range of (0.75-4.0)×1024 yr. In particular, for the 2ν transition to the first 0+ e.s. of Se76, a lower half-life limit of 7.5×1023 yr at 90% CL was achieved.

Published
2021

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

Author

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

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

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

Published
2007

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

Author

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

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

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

Published
2006

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

Author

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

Subjects
neutrinos, solar neutrinos, High Energy Physics::Experiment
Abstract

Results are reported from the complete salt phase of the Sudbury Neutrino Observatory experiment in which NaCl was dissolved in the D_2O target. The addition of salt enhanced the signal from neutron capture, as compared to the pure D_2O detector. By making a statistical separation of charged-current events from other types based on event-isotropy criteria, the effective electron recoil energy spectrum has been extracted. In units of 106 cm-2 s-1, the total flux of active-flavor neutrinos from 8B decay in the Sun is found to be 4.94+0.21_-0.21(stat)+0.38_-0.34(syst) and the integral flux of electron neutrinos for an undistorted 8B spectrum is 1.68+0.06_-0.06(stat)+0.08_-0.09(syst); the signal from (nu_x,e) elastic scattering is equivalent to an electron-neutrino flux of 2.35+0.22-0.22(stat)+0.15_-0.15(syst). These results are consistent with those expected for neutrino oscillations with the so-called Large Mixing Angle parameters, and also with an undistorted spectrum. A search for matter-enhancement effects in the Earth through a possible day-night asymmetry in the charged-current integral rate is consistent with no asymmetry. Including results from other experiments, the best-fit values for two-neutrino mixing parameters are Delta m2 = (8.0+0.6_-0.4) x 10-5 eV2 and theta = 33.9 +2.4_-2.2 degrees.

Published
2005

7. Neutrino observations from the Sudbury Neutrino Observatory

Author

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

Subjects
solar neutrinos Sudbury Neutrino Observatory, Physics
Published
2001

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