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1. The MAJORANA DEMONSTRATOR Neutrinoless Double-Beta Decay Experiment

Author

N. Abgrall, E. Aguayo, F. T. Avignone, A. S. Barabash, F. E. Bertrand, M. Boswell, V. Brudanin, M. Busch, A. S. Caldwell, Y.-D. Chan, C. D. Christofferson, D. C. Combs, J. A. Detwiler, P. J. Doe, Yu. Efremenko, V. Egorov, H. Ejiri, S. R. Elliott, J. Esterline, J. E. Fast, P. Finnerty, F. M. Fraenkle, A. Galindo-Uribarri, G. K. Giovanetti, J. Goett, M. P. Green, J. Gruszko, V. E. Guiseppe, K. Gusev, A. L. Hallin, R. Hazama, A. Hegai, R. Henning, E. W. Hoppe, S. Howard, M. A. Howe, K. J. Keeter, M. F. Kidd, A. Knecht, O. Kochetov, S. I. Konovalov, R. T. Kouzes, B. D. LaFerriere, J. Leon, L. E. Leviner, J. C. Loach, P. N. Luke, S. MacMullin, R. D. Martin, S. Mertens, L. Mizouni, M. Nomachi, J. L. Orrell, C. O'Shaughnessy, N. R. Overman, David Phillips, A. W. P. Poon, K. Pushkin, D. C. Radford, K. Rielage, R. G. H. Robertson, M. C. Ronquest, A. G. Schubert, B. Shanks, T. Shima, M. Shirchenko, K. J. Snavely, N. Snyder, D. Steele, J. Strain, A. M. Suriano, J. Thompson, V. Timkin, W. Tornow, R. L. Varner, S. Vasilyev, K. Vetter, K. Vorren, B. R. White, J. F. Wilkerson, T. Williams, W. Xu, E. Yakushev, A. R. Young, C.-H. Yu, and V. Yumatov

Subjects
Physics, QC1-999
Abstract

The Majorana Demonstrator will search for the neutrinoless double-beta (ββ0ν) decay of the isotope Ge with a mixed array of enriched and natural germanium detectors. The observation of this rare decay would indicate that the neutrino is its own antiparticle, demonstrate that lepton number is not conserved, and provide information on the absolute mass scale of the neutrino. The Demonstrator is being assembled at the 4850-foot level of the Sanford Underground Research Facility in Lead, South Dakota. The array will be situated in a low-background environment and surrounded by passive and active shielding. Here we describe the science goals of the Demonstrator and the details of its design.

Published
2014
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2. Isotope separation by DC18C6 crown-ether for neutrinoless double beta decay of 48Ca

Author

A Rittirong, T Yoshimoto, R Hazama, T Kishimoto, T Fujii, Y Sakuma, S Fukutani, Y Shibahara, and A Sunaga

Subjects
History, Computer Science Applications, Education
Abstract

The isotope separation via liquid-liquid extraction (LLE) using crown-ether (DC18C6) was carried out in order to demonstrate the feasibility of calcium isotope enrichment, which aimed to find a cost-effective way to enrich calcium-48 (48Ca) for the study of neutrinoless double beta decay (0vββ) in the CANDLES project. The LLE results revealed that the extraction was solvent dependent in the presence of HCl and the distribution coefficient (D) increased approximately threefold (0.0546±0.0012) with 12 M HCl solvent under a 3.9 M CaCl2 (aq) (30% w/w) system. Furthermore, the HCl solvent maintained the calcium content attached to the crown-ether at lower feed concentrations. The reaction cell ICP-MS (Agilent 7900) with an additional H2 gas was used to analyze the isotopic composition. The single-stage separation factor of organic phase was found to be 0.992±0.003, 0.994±0.003, 0.996±0.004 for 48Ca/42Ca, 48Ca/43Ca, and 48Ca/44Ca, respectively in the extracted organic phase of 3.3 M CaCl2 (aq) (30% w/w) system. The obtained results were comparable with the HCl solvent system. As a result, without the addition of an acidity reagent, the production of the enriched 48Ca isotope via LLE was highly feasible. To improve the mass production of enriched 48Ca, filter separation was applied in order to shorten the time required and to study various volumes of the extraction system. The results indicated that the extraction efficiency of filter LLE was comparable to conventional LLE. Filter LLE resulted in more than threefold reduction in time required (approximately 10 minutes for a complete single-stage separation) in comparison with a conventional LLE, consequently implying great potential in the enrichment and mass production via filter LLE.

Published
2022
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3. Search for neutrino-less double beta decay of 48Ca-CANDLES

Author

S. Umehara, M. Nomachi, T. Kishimoto, S. Ajimura, Y. Takemoto, K. Tetsuno, K. Takihira, K. Matsuoka, V. T. T. Trang, S. Yoshida, M. Shokati, X. Li, T. Batpurev, B. T. Khai, K. Lee, K. Akutagawa, F. Soberi, K. Mizukoshi, K. Yamamoto, Y. Tamagawa, I. Ogawa, K. Nakajima, M. Tozawa, K. Shimizu, Y. Mori, Y. Ikeyama, K. Ozawa, T. Iida, K. Fushimi, R. Hazama, P. Noithong, K. Suzuki, and H. Ohsumi

Subjects
Physics, History, Particle physics, Double beta decay, Neutrino, Computer Science Applications, Education
Abstract

We have studied the neutrino-less double beta decay(0νββ) of 48Ca with the CANDLES III system, which consists of CaF2(pure) scintillators. Rejection analyses for background events from radioactive contaminations in the CaF2(pure) scintillators were effective to reduce backgrounds in Qββ -value region. As the results, no events were observed in the region for the data of 131 days × 86 kg. It gave a lower limit 6.2 × 1022 year (90 % C.L.) for the half-life of 0νββ of 48Ca. For higher sensitive measurement of 48Ca 0νββ, we have developed new techniques for 48Ca enrichment and CaF2 scintillating bolometer. In this paper, we will also show current status of these techniques.

Published
2020
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4. Status of 48Ca double beta decay search and its future prospect in CANDLES

Author

K. Tetsuno, S. Ajimura, K. Akutagawa, T. Batpurev, W. M. Chan, K. Fushimi, R. Hazama, T. Iida, Y. Ikeyama, B. T. Khai, T. Kishimoto, K. K. Lee, X. Li, K. Matsuoka, K. Mizukoshi, Y. Mori, K. Nakajima, P. Noithong, M. Nomachi, I. Ogawa, H. Ohsumi, K. Ozawa, K. Shimizu, M. Shokati, F. Soberi, K. Suzuki, Y. Takemoto, Y. Takihira, Y. Tamagawa, M. Tozawa, V. T. T. Trang, S. Umehara, K. Yamamoto, S. Yoshida, I Kim, D H Kwon, H L Kim, H J Lee, M K Lee, and Y H Kim

Subjects
Physics, History, Particle physics, Double beta decay, Computer Science Applications, Education
Abstract

CANDLES(CAlcium fluoride for the study of Neutrinos and Dark matters by Low Energy Spectrometer) is the experiment to search for the neutrino-less double beta decay(0vββ) of 48Ca with CaF2 scintillator. 48Ca has the highest Q ββ -value (4.3 MeV) among all isotope candidates for 0vββ. It enables us to measure signals with very low background condition. After rejection analysis with 131 days × 86 kg data for background events from radioactive contaminations in the CaF2 scintillators, no events are observed in the Q ββ -value region. As a result, the half-life of 48Ca is greater than 6.2 × 1022 yr (90% confidence level). For further high sensitive measurement of 48Ca 0vββ search, we have been developing the 48Ca enrichment and CaF2 scintillating bolometer techniques. In this paper, the latest result for CANDLES and the status of scintillating bolometer development are described.

Published
2020

5. The CANDLES Trigger System for the Study of Double Beta Decay of <formula formulatype='inline'><tex Notation='TeX'>$^{48}{\rm Ca}$</tex></formula>

Author

T. Maeda, S. Ajimura, W. M. Chan, K. Fushimi, R. Hazama, K. Ichimura, T. Iida, Y. Inukai, T. Ishikawa, H. Kakubata, T. Kishimoto, K. Matsuoka, K. Nakajima, N. Nakatani, M. Nomachi, I. Ogawa, T. Ohata, H. Ohsumi, M. Saka, K. Sakamoto, K. Seki, Y. Sugaya, K. Suzuki, Y. Tamagawa, D. Tanaka, K. Tetsuno, V. T. T. Trang, S. Umehara, W. Wang, S. Yoshida, and M. Yoshizawa

Subjects
Nuclear and High Energy Physics, Nuclear Energy and Engineering, Electrical and Electronic Engineering
Published
2015
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6. 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
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7. 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
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8. SEARCHES FOR HIGH-FREQUENCY VARIATIONS IN THE B-8 SOLAR NEUTRINO FLUX AT THE SUDBURY NEUTRINO OBSERVATORY

Author

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

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, FOS: Physical sciences, Astrophysics, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Observatory, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, Nuclear Experiment (nucl-ex), 010303 astronomy & astrophysics, Nuclear Experiment, Solar and Stellar Astrophysics (astro-ph.SR), Physics, Sudbury Neutrino Observatory, Solar observatory, 010308 nuclear & particles physics, Astronomy, Astronomy and Astrophysics, Solar neutrino problem, Neutrino detector, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Physics::Space Physics, Measurements of neutrino speed, Neutrino
Abstract

We have performed three searches for high-frequency signals in the solar neutrino flux measured by the Sudbury Neutrino Observatory (SNO), 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/day to 144/day, 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 SoHO 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., 37 pages, 17 figures, submitted to ApJ

Published
2016
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9. Mechanisms Controlling Feed Intake in Large-type Goats Fed on Dry Forage

Author

Katsunori Sunagawa, Itsuki Nagamine, Y. Murase, Takeshi Ooshiro, and R. Hazama

Subjects
medicine.medical_specialty, Chemistry, digestive, oral, and skin physiology, Antagonist, Saliva secretion, Forage, Thirst, Plasma osmolality, Somatostatin, Endocrinology, Internal medicine, medicine, Animal Science and Zoology, Parotid saliva, medicine.symptom, Artificial cerebrospinal fluid, Food Science
Abstract

An intracerebroventricular (ICV) infusion of somatostatin 1-28 (SRIF) was used as a thirst-controlling peptide antagonist to investigate whether or not thirst-controlling peptides are involved in the significant decrease in feed intake during the initial stages of feeding large-type goats on dry forage. A continuous ICV infusion of SRIF was conducted at a small dose of 4 μg/0.2 ml/h for 27 h from day 1 to day 2. Goats (n 5) were fed roughly crushed alfalfa hay cubes for 2 h twice daily and water was given ad libitum. Feed intake was measured during ICV infusion of artificial cerebrospinal fluid (ACSF) and SRIF. The feed intake during SRIF infusion increased significantly compared to that during ACSF infusion. In comparison to the ACSF treatment, plasma osmolality during the SRIF treatment significantly decreased during the first half of the 2 h feeding period. The factor causing the decrease in plasma osmolality during the ICV infusion of SRIF was a decrease in plasma Na, K, Cl, and Mg concentrations. In comparison to the ACSF infusion treatment, parotid saliva secretion volumes during the 2 h feeding period in the SRIF infusion treatment were significantly larger. While there was no significant difference in cumulative water intake (thirst levels) between the SRIF and the ACSF treatments upon conclusion of the 2 h feeding period, based on the plasma osmolality results it is thought that thirst level increases brought about by alfalfa hay cube feeding in the first half of the feeding period were reduced. It is thought that the somatostatin-induced increases in feed intake during the 2 h feeding period in the present experiment were caused by decreases in plasma osmolality brought about by the somatostatin infusion. As a result, it is suggested that the significant decrease in feed intake during the initial stages of feeding in large-type goats given roughly crushed alfalfa hay cubes, was due to the actions of thirst-controlling peptides.

Published
2007
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10. Spectroscopy of Double-Beta and Inverse-Beta Decays from100Mofor Neutrinos

Author

Hiroyasu Ejiri, R. G. H. Robertson, Jonathan Engel, Plamen I. Krastev, Nobuyuki Kudomi, and R. Hazama

Subjects
Physics, Nuclear physics, Particle physics, MAJORANA, Q value, Inverse beta decay, Double beta decay, Beta particle, General Physics and Astronomy, High Energy Physics::Experiment, Beta (velocity), Neutrino, Beta decay
Abstract

Spectroscopic studies of two beta rays from 100Mo are shown to be of potential interest for investigating both the Majorana nu mass by neutrinoless double beta decay (0nubetabeta) and low energy solar nu's by inverse beta decay. With a multiton 100Mo detector, coincidence studies of correlated betabeta from 0nubetabeta, together with the large Q value ( Q(betabeta)), permit identification of the nu-mass term with a sensitivity of approximately 0.03 eV. Correlation studies of the inverse beta decay and the successive beta decay of 100Tc, together with the large capture rates for low energy solar nu's, make it possible to detect, in real time, individual low energy solar nu in the same detector.

Published
2000
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11. CANDLES for double beta decay of48Ca

Author

K Matsuoka, K. Ichihara, Yoshiyuki Hirano, T Kishimoto, Izumi Ogawa, S. Yoshida, S. Umehara, D. Yokoyama, A. Yanagisawa, R Hazama, and K. Mukaida

Subjects
Physics, History, Particle physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Detector, Astrophysics::Cosmology and Extragalactic Astrophysics, Scintillator, Computer Science Applications, Education, Nuclear physics, MAJORANA, Double beta decay, High Energy Physics::Experiment, Beta (velocity), Neutrino
Abstract

CANDLES is the project to search for neutrinoless double beta(0νββ) decay of 48Ca by using CaF2 scintillators. The observation of 0νββ decay will prove existence of a massive Majorana neutrino. The expected performances of the CANDLES system for lightsignal detection and background rejection are presented here. The current status of development for the detector system is also described.

Published
2006
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12. MOON for spectroscopic studies of double beta decays and the present status of the MOON-1 prototype detector

Author

H Nakamura, H Ejiri, K Fushimi, K Ichihara, K Matsuoka, M Nomachi, R Hazama, S Umehara, S Yoshida, T Ogama, T Sakiuchi, V H Hai, Y Sugaya, and the Moon collaboration

Subjects
Physics, History, Detector, Astrophysics, Physics::Geophysics, Computer Science Applications, Education, MAJORANA, Observatory, Beta (plasma physics), Physics::Space Physics, Underground laboratory, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Neutrino
Abstract

The MOON (Molybdenum Observatory Of Neutrinos) project, as an extension of ELEGANT V, aims at spectroscopic studies of double beta decays from 100Mo with a sensitivity of the Majorana neutrino mass around 30 meV. Measurements with good energy and position resolutions enable one to select true signals and to reject background ones. A prototype MOON detector (MOON Phase-1A) with 142 g 100Mo was built and is running at the Oto underground laboratory. The present report describes briefly the outline of the MOON project and the present status of MOON-1.

Published
2006
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13. Search for neutrino-less double beta decay by CANDLES

Author

S. Umehara, T. Kishimoto, M. Nomachi, S. Yoshida, S. Ajimura, K. Suzuki, K. Ichimura, K. Matsuoka, N. Nakatani, G. Ito, H. Kakubata, M. Saka, W. Wang, J. Takemoto, W. Chan, M. Doihara, Y. Tamagawa, I. Ogawa, S. Ueno, S. Maeda, A. Yamamoto, S. Tomita, G. Fujita, A. Kawamura, T. Harada, K. Fushimi, R. Hazama, H. Ohsumi, and K. Okada

Published
2013
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14. A Search for Astrophysical Burst Signals at the Sudbury Neutrino Observatory

Author

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

Subjects
Physics, Sudbury Neutrino Observatory, Physics::Instrumentation and Detectors, Solar neutrino, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Astronomy, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Solar neutrino problem, Neutrino detector, Astrophysics - Solar and Stellar Astrophysics, Measurements of neutrino speed, Astrophysics::Solar and Stellar Astrophysics, High Energy Physics::Experiment, Neutrino astronomy, Neutrino, Nuclear Experiment (nucl-ex), Neutrino oscillation, Nuclear Experiment, QC, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract

The Sudbury Neutrino Observatory (SNO) has confirmed the standard solar model and neutrino oscillations through the observation of neutrinos from the solar core. In this paper we present a search for neutrinos associated with sources other than the solar core, such as gamma-ray bursts and solar flares. We present a new method for looking for temporal coincidences between neutrino events and astrophysical bursts of widely varying intensity. No correlations were found between neutrinos detected in SNO and such astrophysical sources., United States. Dept. of Energy, National Energy Research Scientific Computing Center (U.S.), Alfred P. Sloan Foundation

Published
2013
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15. The Majorana Demonstrator: A search for neutrinoless double-beta decay of germanium-76

Author

S. R. Elliott, N. Abgrall, E. Aguayo, F. T. Avignone III, A. S. Barabash, F. E. Bertrand, M. Boswell, V. Brudanin, M. Busch, A. S. Caldwell, Y-D. Chan, C. D. Christofferson, D. C. Combs, J. A. Detwiler, P. J. Doe, Yu. Efremenko, V. Egorov, H. Ejiri, J. Esterline, J. E. Fast, P. Finnerty, F. M. Fraenkle, A. Galindo-Uribarri, G. K. Giovanetti, J. Goett, M. P. Green, J. Gruszko, V. E. Guiseppe, K. Gusev, A. L. Hallin, R. Hazama, A. Hegai, R. Henning, E. W. Hoppe, S. Howard, M. A. Howe, K. J. Keeter, M. F. Kidd, O. Kochetov, S. I. Konovalov, R. T. Kouzes, B. D. LaFerriere, J. Leon, L. E. Leviner, J. C. Loach, S. MacMullin, R. D. Martin, S. Mertens, L. Mizouni, M. Nomachi, J. L. Orrell, C. O'Shaughnessy, N. R. Overman, D. G. Phillips II, A. W. P. Poon, K. Pushkin, D. C. Radford, K. Rielage, R. G. H. Robertson, M. C. Ronquest, A. G. Schubert, B. Shanks, T. Shima, M. Shirchenko, K. J. Snavely, N. Snyder, A. Soin, J. Strain, A. M. Suriano, V. Timkin, W. Tornow, R. L. Varner, S. Vasilyev, K. Vetter, K. Vorren, B. R. White, J. F. Wilkerson, W. Xu, E. Yakushev, A. R. Young, C.-H. Yu, and V. Yumatov

Published
2013
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16. The Majorana Demonstrator: A search for neutrinoless double-beta decay of germanium-76

Author

A.G. Schuberta, E. Aguayo, F.T. Avignone III, C. Zhang, H.O. Back, A.S. Barabash, M. Bergevin, F.E. Bertrand, M. Boswell, V. Brudanin, M. Busch, Y.D. Chan, C.D. Christofferson, J.I. Collar, D.C. Combs, R.J. Cooper, J.A. Detwiler, J. Leon, P.J. Doe, Yu. Efremenko, V. Egorov, H. Ejiri, S.R. Elliott, J. Esterline, J.E. Fast, N. Fields, P. Finnerty, F.M. Fraenkle, V.M. Gehman, G.K. Giovanetti, M.P. Green, V.E. Guiseppe, K. Gusey, A.L. Hallin, R. Hazama, R. Henning, A. Hime, E.W. Hoppe, M. Horton, S. Howard, M.A. A. Howe, R.A. Johnson, K.J. Keeter, M.E. Keillor, C. Keller, J.D. Kephart, M.F. Kidd, A. Knecht, O. Kochetov, S.I. Konovalov, R.T. Kouzes, B. LaFerriere, B.H. LaRoque, L.E. Leviner, J.C. Loach, S. MacMullin, M.G. Marino, R.D. Martin, D.-M. Mei, J. Merriman, M.L. Miller, L. Mizouni, M. Nomachi, J.L. Orrell, N. Overman, D.G. Phillips II, A.W.P. Poon, G. Perumpilly, G. Prior, D.C. Radford, K. Rielage, R.G.H. Robertson, M.C. Ronquest, T. Shima, M. Shirchenko, K.J. Snavely, V. Sobolev, D. Steele, J. Strain, K. Thomas, V. Timkin, W. Tornow, I. Vanyushin, R.L. Varner, K. Vetter, K. Vorren, J.F. Wilkerson, B.A. Wolfe, E. Yakushev, A.R. Young, C.-H. Yu, and V. Yumatov

Subjects
Physics, Particle physics, Bolometer, chemistry.chemical_element, Germanium, Lepton number, law.invention, Nuclear physics, MAJORANA, CUORE, chemistry, law, Double beta decay, Neutrino, Absolute scale
Abstract

The observation of neutrinoless double-beta decay would determine whether the neutrino is a Majorana particle and provide information on the absolute scale of neutrino mass. The Majorana Collaboration is constructing the Demonstrator, an array of germanium detectors, to search for neutrinoless double-beta decay of 76Ge. The Demonstrator will contain 40kg of germanium; up to 30kg will be enriched to 86% in 76Ge. The Demonstrator will be deployed deep underground in an ultra-low-background shielded environment. Operation of the Demonstrator aims to determine whether a future tonne-scale germanium experiment can achieve a background goal of one count per tonne-year in a 4-keV region of interest around the 76Ge neutrinoless double-beta decay Q-value of 2039 keV.

Published
2012
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17. Double beta decays of 100Mo and molybdenum observatory of neutrinos

Author

K. Matsuoka, R. Hazama, Ken-Ichi Fushimi, Plamen I. Krastev, K. Takahisa, Nobuyuki Kudomi, Kyo Kume, Hiroyasu Ejiri, Jonathan Engel, S. Yoshida, H. Kuramoto, T. Kishimoto, K. Hayashi, and R. G. H. Robertson

Subjects
Nuclear physics, Physics, Massless particle, Nuclear and High Energy Physics, Particle physics, Neutrino detector, Observatory, Double beta decay, Neutrino, Beta decay, Atomic and Molecular Physics, and Optics, Radioactive decay, Lepton
Abstract

Exclusive measurements of neutrino-less double beta decays(0νββ) of 100Mo were made by means of ELEGANT V. The present status of the double beta decay experiment with ELEGANT V is presented. The data at Oto lab., being combined with the data at Kamioka, gives stringent limits on half-lives for 0νββB and 0νββ. The multiton 100Mo detector, coincidence studies of correlated ββ from 0νββ, is now under development to study the neutrino mass with a sensitivity of ∼ 0.03eV.

Published
2002
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18. LOW-MULTIPLICITY BURST SEARCH AT THE SUDBURY NEUTRINO OBSERVATORY

Author

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

Subjects
Physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Detector, FOS: Physical sciences, Astronomy, Astronomy and Astrophysics, Elementary particle, Astrophysics, 01 natural sciences, High Energy Physics - Experiment, Massless particle, High Energy Physics - Experiment (hep-ex), Supernova, Space and Planetary Science, 0103 physical sciences, Neutrino, Multiplicity (chemistry), 010306 general physics
Abstract

Results are reported from a search for low-multiplicity neutrino bursts in the Sudbury Neutrino Observatory (SNO). Such bursts could indicate detection of a nearby core-collapse supernova explosion. The data were taken from Phase I (November 1999 - May 2001), when the detector was filled with heavy water, and Phase II (July 2001 - August 2003), 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., 11 pages, 4 figures, submitted to ApJ

Published
2011

19. Low radioactivity CaF[sub 2] scintillator crystals for CANDLES

Author

Yoichi Tamagawa, Izumi Ogawa, Tadafumi Kishimoto, K. Fushimi, H. Kakubata, K. Yasuda, G. Ito, M. Nomachi, M. Miyashita, K. Matsuoka, Saori Umehara, R. Hazama, S. Yoshida, H. Ohsumi, and K. Okada

Subjects
Physics, Particle physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Dark matter, Astrophysics::Cosmology and Extragalactic Astrophysics, Scintillator, Nuclear physics, Massless particle, MAJORANA, Double beta decay, High Energy Physics::Experiment, Neutrino, Radioactive decay, Lepton
Abstract

CANDLES is the project to search for neutrinoless double beta (0νββ) decay of 48Ca by using CaF2 scintillators. The observation of 0νββ decay will prove the existence of massive Majorana neutrinos. Expected performances and current status of the CANDLES system are described.

Published
2011
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20. The Majorana Experiment

Author

C.E. Aalseth, E. Aguayo, M. Amman, F.T. Avignone, H.O. Back, X. Bai, A.S. Barabash, P.S. Barbeau, M. Bergevin, F.E. Bertrand, M. Boswell, V. Brudanin, W. Bugg, T.H. Burritt, M. Busch, G. Capps, Y.-D. Chan, J.I. Collar, R.J. Cooper, R. Creswick, J.A. Detwiler, J. Diaz, P.J. Doe, Yu. Efremenko, V. Egorov, H. Ejiri, S.R. Elliott, J. Ely, J. Esterline, H. Farach, J.E. Fast, N. Fields, P. Finnerty, F.M. Fraenkle, V.M. Gehman, G.K. Giovanetti, M. Green, V.E. Guiseppe, K. Gusey, A.L. Hallin, G.C. Harper, R. Hazama, R. Henning, A. Hime, H. Hong, E.W. Hoppe, T.W. Hossbach, S. Howard, M.A. Howe, R.A. Johnson, K.J. Keeter, M. Keillor, C. Keller, J.D. Kephart, M.F. Kidd, A. Knecht, O. Kochetov, S.I. Konovalov, R.T. Kouzes, B.H. LaRoque, L. Leviner, J.C. Loach, P.N. Luke, S. MacMullin, M.G. Marino, R.D. Martin, D. Medlin, D.-M. Mei, H.S. Miley, M.L. Miller, L. Mizouni, A.W. Myers, M. Nomachi, J.L. Orrell, D. Peterson, D.G. Phillips, A.W.P. Poon, O. Perevozchikov, G. Perumpilly, G. Prior, D.C. Radford, D. Reid, K. Rielage, R.G.H. Robertson, L. Rodriguez, M.C. Ronquest, H. Salazar, A.G. Schubert, T. Shima, M. Shirchenko, V. Sobolev, D. Steele, J. Strain, G. Swift, K. Thomas, V. Timkin, W. Tornow, T.D. Van Wechel, I. Vanyushin, R.L. Varner, K. Vetter, K. Vorren, J.F. Wilkerson, B.A. Wolfe, W. Xiang, E. Yakushev, H. Yaver, A.R. Young, C.-H. Yu, V. Yumatov, and C. Zhang

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, FOS: Physical sciences, Construct (python library), 01 natural sciences, Atomic and Molecular Physics, and Optics, MAJORANA, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Hpge detector, Nuclear Experiment
Abstract

The Majorana Collaboration is assembling an array of HPGe detectors to search for neutrinoless double-beta decay in Ge-76. Initially, Majorana aims to construct a prototype module to demonstrate the potential of a future 1-tonne experiment. The design and potential reach of this prototype Demonstrator module are presented., Comment: Proceedings of NOW2010, Conca Specchiulla, Italy, September 4-11, 2010

Published
2011
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21. Neutrino-less Double Beta Decay of [sup 48]Ca -CANDLES

Author

T. Kishimoto, S. Yoshida, K. Matsuoka, K. Ichimura, G. Ito, K. Yasuda, H. Kakubata, M. Miyashita, K. Takubo, M. Nomachi, M. Saka, K. Seki, S. Ajimura, S. Umehara, N. Nakatani, Y. Tamagawa, I. Ogawa, K. Fushimi, R. Hazama, H. Ohsumi, K. Okada, Y. Fujii, Atsushi Hosaka, Kanchan Khemchandani, Hideko Nagahiro, and Kanabu Nawa

Subjects
Physics, Particle physics, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Lepton number, Massless particle, Nuclear physics, MAJORANA, Double beta decay, CP violation, High Energy Physics::Experiment, Neutrino, Radioactive decay, Lepton
Abstract

Neutrino‐less double beta decay (0νββ) is currently known to be an only experiment to verify whether lepton number is conserved or not. The lepton number non‐conservation is the key to create matter dominated universe with CP violation. The so‐called leptogenesys scenario presents a way to create the matter dominated universe by these violations. If neutrinos have Majorana mass, transition from a particle to an anti‐particle is possible and the left‐handed and right‐handed neutrinos could have different masses. It is highly likely that the neutrinos are Majorana particles. We have been studying double beta decay of 48Ca. Our first stage experiment using the ELEGANT VI detector system gave the best lower limit of the half life of 0νββ of 48Ca. We have been working on CANDLES detector system to sense much longer lifetime region. We have developed techniques to reduce backgrounds. The CADLES detector system was installed at Kamioka underground laboratory. Here I describe a schematic view of the system.

Published
2011
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22. 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
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23. Study of Double Beta Decay of [sup 48]Ca by CANDLES

Author

S. Umehara, T. Kishimoto, I. Ogawa, K. Matsuoka, G. Ito, K. Yasuda, H. Kakubata, M. Miyashita, M. Nomachi, S. Ajimura, Y. Tamagawa, K. Fushimi, R. Hazama, H. Ohsumi, K. Okada, S. Yoshida, Y. Fujii, Akira Ozawa, and Weiping Lu

Subjects
Physics, Particle physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Detector, Astrophysics::Cosmology and Extragalactic Astrophysics, Beta decay, Nuclear physics, MAJORANA, Double beta decay, High Energy Physics::Experiment, Neutrino, Neutrino oscillation, Radioactive decay, Lepton
Abstract

CANDLES is the project to search for neutrino‐less double beta decay (0νββ) of 48Ca. The observation of 0νββ will prove existence of a massive Majorana neutrino. We have developed the new detector system CANDLES which features CaF2 (pure) scintillators. Here expected performances of the system for background rejection are presented. It is also described current status of development for the detector system.

Published
2010
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24. PICO-LON project to search for cosmic dark matter

Author

K. Fushimi, H. Ejiri, K. Harada, R. Hazama, K. Imagawa, Y. Kameda, E. Matsumoto, S. Nakayama, T. Shima, Isao Tanihara, Hooi Jin Ong, Atsushi Tamii, Tadafumi Kishimoto, Toshitaka Kajino, Shigeru Kubono, and Tatsushi Shima

Subjects
Physics, Large Underground Xenon experiment, COSMIC cancer database, Physics::Instrumentation and Detectors, Scintillation counter, Dark matter, Astrophysics::Instrumentation and Methods for Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Scintillator, Particle identification, Particle detector, Cosmology
Abstract

The dark matter search project PICO‐LON has been started. Thin and wide area NaI(Tl) scintillator is the promising detector system to study the properties of dark matter particle.

Published
2010
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25. The MAJORANA DEMONSTRATOR: An R&D project towards a tonne-scale germanium neutrinoless double-beta decay search

Author

C. E. Aalseth, M. Amman, J. F. Amsbaugh, F. T. Avignone, H. O. Back, A. S. Barabash, P. S. Barbeau, J. R. Beene, M. Bergevin, F. E. Bertrand, M. Boswell, V. Brudanin, W. Bugg, T. H. Burritt, Y.-D. Chan, J. I. Collar, R. J. Cooper, R. Creswick, J. A. Detwiler, P. J. Doe, Yu. Efremenko, V. Egorov, H. Ejiri, S. R. Elliott, J. Ely, J. Esterline, H. Farach, J. E. Fast, N. Fields, P. Finnerty, B. Fujikawa, E. Fuller, V. M. Gehman, G. K. Giovanetti, V. E. Guiseppe, K. Gusey, A. L. Hallin, R. Hazama, R. Henning, A. Hime, E. W. Hoppe, T. W. Hossbach, M. A. Howe, R. A. Johnson, K. J. Keeter, M. Keillor, C. Keller, J. D. Kephart, M. F. Kidd, O. Kochetov, S. I. Konovalov, R. T. Kouzes, K. T. Lesko, L. Leviner, J. C. Loach, P. N. Luke, S. MacMullin, M. G. Marino, D.-M. Mei, H. S. Miley, M. Miller, L. Mizouni, A. Montoya, A. W. Myers, M. Nomachi, B. Odom, J. L. Orrell, D. Phillips, A. W. P Poon, G. Prior, J. Qian, D. C. Radford, K. Rielage, R. G. H. Robertson, L. Rodriguez, K. P. Rykaczewski, A. G. Schubert, T. Shima, M. Shirchenko, J. Strain, K. Thomas, R. Thompson, V. Timkin, W. Tornow, T. D. Van Wechel, I. Vanyushin, K. Vetter, R. Warner, J. F. Wilkerson, J. M. Wouters, E. Yakushev, A. R. Young, C.-H. Yu, V. Yumatov, C. Zhang, S. Zimmerman, and Marvin L. Marshak

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Dark matter, chemistry.chemical_element, Germanium, 7. Clean energy, 01 natural sciences, MAJORANA, chemistry, Double beta decay, 0103 physical sciences, Underground laboratory, 010306 general physics, Tonne, Nuclear Experiment
Abstract

The MAJORANA collaboration is pursuing the development of the so-called MAJORANA DEMONSTRATOR. The DEMONSTRATOR is intended to perform research and development towards a tonne-scale germanium-based experiment to search for the neutrinoless double-beta decay of Ge-76. The DEMONSTRATOR can also perform a competitive direct dark matter search for light WIMPs in the 1-10 GeV/c^2 mass range. It will consist of approximately 60-kg of germanium detectors in an ultra-low background shield located deep underground at the Sanford Underground Laboratory in Lead, SD. The DEMONSTRATOR will also perform background and technology studies, and half of the detector mass will be enriched germanium. This talk will review the motivation, design, technology and status of the DEMONSTRATOR., Comment: CIPANP 2009 Conference Proceedings

Published
2009

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

Author

I. Levine, H. M. O'Keeffe, M. L. Miller, R. D. Martin, R. G. H. Robertson, X. Dai, J. A. Detwiler, Keith Rielage, T.H. Burritt, J. R. Leslie, T. J. Sonley, R. Lange, Christopher C. M. Kyba, S. N. Ahmed, Bei Cai, Yuen-Dat Chan, K. Graham, S. M. Oser, Jocelyn Monroe, N. Barros, S. R. Seibert, Reyco Henning, M.G. Boulay, C. A. Currat, N. Gagnon, G. T. Ewan, R. Hazama, M. A. Howe, M. Huang, G. D. Orebi Gann, B. Aharmim, M. W.E. Smith, H. Deng, P. Skensved, C. K. Hargrove, T. Tsui, H. B. Mak, M. Bergevin, H. Wan Chan Tseung, K. Boudjemline, J. R. Wilson, C. E. Okada, J. J. Simpson, Chris Waltham, S. Habib, D. L. Wark, G. Tešić, C. Kraus, A. Wright, David A. Sinclair, O. Simard, J. Wendland, Steven Elliott, A. D. Marino, N. McCauley, S. McGee, G. Prior, S. D. Biller, Y. Opachich, P. J. Harvey, J. M. Wouters, C. B. Krauss, N. S. Oblath, Alain Bellerive, J. F. Wilkerson, S. J. M. Peeters, J. T.M. Goon, Darren Grant, B. Jamieson, Hal Evans, L. C. Stonehill, B. T. Cleveland, R. L. Helmer, A. B. McDonald, E. Guillian, C. J. Virtue, E. D. Hallman, T. C. Andersen, Monica Dunford, J. Maneira, R. L. Hahn, A. W. P. Poon, B. C. Robertson, G. Doucas, P. J. Doe, R. A. Ott, K. M. Heeger, T. D. Steiger, T. Kutter, M. L. Chen, R. J. Ford, B.A. VanDevender, R. MacLellan, Joseph A. Formaggio, C. Howard, J. Farine, Minfang Yeh, A. J. Noble, J. C. Loach, N. A. Jelley, S. Majerus, Joshua R. Klein, R. S. Dosanjh, Andrew Hime, E. Rollin, M. C. Chon, J. A. Secrest, I. T. Lawson, R. J. Hemingway, M. Kos, B. Beltran, E. W. Beier, D. Waller, A. L. Hallin, C. Mifflin, Kai Zuber, N. West, W. J. Heintzelman, H. Fergani, K. T. Lesko, Benjamin Monreal, N. Tagg, M. H. Schwendener, F. A. Duncan, F. Zhang, J. Law, P.-L. Drouin, Peter Watson, N. Tolich, G.A. Cox-Mobrand, F. Dalnoki-Veress, A. Krüger, R. G. Van de Water, J. Heise, F. Fleurot, A. E. Anthony, and S. Luoma

Subjects
Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Flux, FOS: Physical sciences, Cosmic ray, Astrophysics, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Neutrino oscillation, Zenith, Physics, Sudbury Neutrino Observatory, Research Groups and Centres\Physics\Low Temperature Physics, Muon, 010308 nuclear & particles physics, Faculty of Science\Physics, High Energy Physics::Phenomenology, Astrophysics::Instrumentation and Methods for Astrophysics, High Energy Physics::Experiment, Neutrino, Lepton
Abstract

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 un-oscillated portion of the neutrino flux. A total of 514 muon-like events are measured between $-1 \le \cos{\theta}_{\rm zenith} \le 0.4$ in a total exposure of 2.30\times 10^{14}$ cm$^{2}$ s. The measured flux normalization is $1.22 \pm 0.09$ 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 $\cos{\theta}_{\rm zenith} > 0.4$ is measured to be $(3.31 \pm 0.01 {\rm (stat.)} \pm 0.09 {\rm (sys.)}) \times 10^{-10}~\mu$/s/cm$^{2}$., Comment: 17 pages, 11 figures

Published
2009

27. The MAJORANA Neutrinoless Double-Beta Decay Experiment

Author

V.E. Guiseppe, C.E. Aalseth, M. Akashi-Ronquest, M. Amman, J.F. Amsbaugh, F.T. Avignone, H.O. Back, A.S. Barabash, P. Barbeau, J.R. Beene, M. Bergevin, F.E. Bertrand, M. Boswell, V. Brudanin, W. Bugg, T.H. Burritt, Y-D. Chan, T.V. Cianciolo, J. Collar, R. Creswick, M. Cromaz, J.A. Detwiler, P.J. Doe, J.A. Dunmore, Yu. Efremenko, V. Egorov, H. Ejiri, S.R. Elliott, J. Ely, J. Esterline, H. Farach, T. Farmer, J. Fast, P. Finnerty, B. Fujikawa, V.M. Gehman, C. Greenberg, K. Gusey, A.L. Hallin, R. Hazama, R. Henning, A. Hime, E. Hoppe, T. Hossbach, M.A. Howe, D. Hurley, B. Hyronimus, R.A. Johnson, K.J. Keeter, M. Keillor, C. Keller, J. Kephart, M. Kidd, O. Kochetov, S.I. Konovalov, R.T. Kouzes, K.T. Lesko, L. Leviner, P. Luke, A.B. McDonald, S. MacMullin, M.G. Marino, D.-M. Mei, H.S. Miley, A.W. Myers, M. Nomachi, B. Odom, J. Orrell, A.W.P. Poon, G. Prior, D.C. Radford, J.H. Reeves, K. Rielage, N. Riley, R.G.H. Robertson, L. Rodriguez, K.P. Rykaczewski, A.G. Schubert, T. Shima, M. Shirchenko, J. Strain, R. Thompson, V. Timkin, W. Tornow, C. Tull, T. D. Van Weche, I. Vanyushin, R.L. Varner, K. Vetter, R. Warner, J.F. Wilkerson, J.M. Wouters, E. Yakushev, A.R. Young, C.-H. Yu, V. Yumatov, and C. Zhang

Subjects
Physics, Signal processing, Particle physics, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Detector, FOS: Physical sciences, Particle detector, MAJORANA, Double beta decay, High Energy Physics::Experiment, Sensitivity (control systems), Nuclear Experiment (nucl-ex), Neutrino, Nuclear Experiment, Lepton
Abstract

Neutrinoless double-beta decay searches play a major role in determining the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino mass. The Majorana Collaboration proposes to assemble an array of HPGe detectors to search for neutrinoless double-beta decay in Ge-76. Our proposed method uses the well-established technique of searching for neutrinoless double-beta decay in high purity Ge-diode radiation detectors that play both roles of source and detector. The technique is augmented with recent improvements in signal processing and detector design, and advances in controlling intrinsic and external backgrounds. Initially, Majorana aims to construct a prototype module containing 60 kg of Ge detectors to demonstrate the potential of a future 1-tonne experiment. The design and potential reach of this prototype Demonstrator module will be presented. This paper will also discuss detector optimization and low-background requirements, such as material purity, background rejection, and identification of rare backgrounds required to reach the sensitivity goals of the Majorana experiment., Comment: paper submitted to the 2008 IEEE Nuclear Science Symposium Conference Record

Published
2008
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28. Independent measurement of the total active 8B solar neutrino flux using an array of 3He proportional counters at the sudbury neutrino observatory

Author

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

Subjects
High Energy Physics::Experiment, Nuclear Experiment, Astrophysics::Galaxy Astrophysics
Abstract

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.

Published
2008
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29. An array of low-background $^3$He proportional counters for the Sudbury Neutrino Observatory

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, Solar neutrino, Detector, FOS: Physical sciences, Proportional counter, 01 natural sciences, Particle detector, Nuclear physics, Surface coating, Optics, 0103 physical sciences, Neutron detection, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Neutrino, Nuclear Experiment, 010306 general physics, business, Instrumentation
Abstract

An array of Neutral-Current Detectors (NCDs) has been built in order to make a unique measurement of the total active flux 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 filled with a mixture of $^3$He and CF$_4$ gas capable of detecting the neutrons liberated by the neutrino-deuteron neutral current reaction in the D$_2$O, and four strings filled with a mixture of $^4$He and CF$_4$ 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., 32 pages, 18 figures, 6 tables

Published
2007

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

Author

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

Subjects
Physics::Instrumentation and Detectors, Solar neutrino, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 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, Astrophysics (astro-ph), Astronomy and Astrophysics, Solar neutrino problem, Neutrino detector, 13. Climate action, Space and Planetary Science, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Lepton
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, Comment: 12 pages, 5 figures, accepted for publication by ApJ. Minor updates to address referees comments

Published
2006
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31. 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
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32. Search for periodicities in theB8solar neutrino flux measured by the Sudbury Neutrino Observatory

Author

B. Aharmim, S. N. Ahmed, A. E. Anthony, E. W. Beier, A. Bellerive, M. Bergevin, S. D. Biller, M. G. Boulay, M. G. Bowler, Y. D. Chan, M. Chen, X. Chen, B. T. Cleveland, T. Costin, G. A. Cox, C. A. Currat, X. Dai, H. Deng, J. Detwiler, 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, W. Frati, B. G. Fulsom, N. Gagnon, J. TM. Goon, K. Graham, R. L. Hahn, 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, M. A. Howe, M. Huang, E. Inrig, 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, J. Maneira, A. D. Marino, N. McCauley, A. B. McDonald, S. McGee, C. Mifflin, K. K. S. Miknaitis, B. G. Nickel, A. J. Noble, E. B. Norman, N. S. Oblath, C. E. Okada, H. M. O’Keeffe, R. W. Ollerhead, G. D. Orebi Gann, J. L. Orrell, S. M. Oser, T. Ouvarova, S. J. M. Peeters, A. W. P. Poon, C. S. J. Pun, K. Rielage, B. C. Robertson, R. G. H. Robertson, E. Rollin, S. S. E. Rosendahl, M. H. Schwendener, S. R. Seibert, O. Simard, J. J. Simpson, C. J. Sims, D. Sinclair, L. Sinclair, P. Skensved, M. W. E. Smith, R. G. Stokstad, L. C. Stonehill, R. Tafirout, Y. Takeuchi, G. Tešić, M. Thomson, K. V. Tsang, T. Tsui, R. Van Berg, 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, J. M. Wouters, M. Yeh, and K. Zuber

Subjects
Physics, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, Flux, Astrophysics, Solar neutrino problem, 01 natural sciences, Radiation flux, Neutrino detector, 0103 physical sciences, High Energy Physics::Experiment, Neutrino, 010306 general physics, Lepton
Abstract

A search has been made for sinusoidal periodic variations in the 8B 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 8B 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 8B neutrino flux.

Published
2005
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33. An analyses of return loss in water immersion tests for PC connectors

Author

S. Ikuno, Seiko Mitachi, Hiroaki Kurokawa, Y. Kimura, and R. Hazama

Subjects
All-silica fiber, Optics, Materials science, Double-clad fiber, business.industry, Return loss, Ferrule, Penetration (firestop), Composite material, business, Cladding (fiber optics), Step-index profile, Refractive index
Abstract

Return loss characteristics are observed in the water immersion test of physical contact (PC) connector with glass-ceramic ferrule (GCF). It is considered that the return loss characteristics strongly depend on variation of refractive indices of core and cladding. In the water immersion test, the penetration of water seems to cause variation of refractive indices. Unique characteristics of return loss in the water immersion tests are explained by means of numerical analyses.

Published
2004
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34. 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

35. 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
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37. Measurement of the total active 8B solar neutrino flux at the Sudbury Neutrino Observatory with enhanced neutral current sensitivity

Author

S N, Ahmed, A E, Anthony, E W, Beier, A, Bellerive, S D, Biller, J, Boger, M G, Boulay, M G, Bowler, T J, Bowles, S J, Brice, T V, Bullard, Y D, Chan, M, Chen, X, Chen, B T, Cleveland, G A, Cox, X, Dai, F, Dalnoki-Veress, P J, Doe, R S, Dosanjh, G, Doucas, M R, Dragowsky, 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, M M, Fowler, K, Frame, B G, Fulsom, N, Gagnon, K, Graham, D R, Grant, R L, Hahn, J C, Hall, A L, Hallin, E D, Hallman, A S, Hamer, W B, Handler, C K, Hargrove, P J, Harvey, R, Hazama, K M, Heeger, W J, Heintzelman, J, Heise, R L, Helmer, R J, Hemingway, A, Hime, M A, Howe, P, Jagam, N A, Jelley, J R, Klein, M S, Kos, 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, 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, G G, Miller, B A, Moffat, C W, Nally, 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, B C, Robertson, R G H, Robertson, E, Rollin, S S E, Rosendahl, V L, Rusu, M H, Schwendener, 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, Tesić, M, Thomson, M, Thorman, 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, N, West, J B, Wilhelmy, J F, Wilkerson, J R, Wilson, J M, Wouters, M, Yeh, and K, Zuber

Abstract

The Sudbury Neutrino Observatory has precisely determined the total active (nu(x)) 8B 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) x 10(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(+1.2)(-0.6) x 10(-5) eV(2) and theta=32.5(+2.4)(-2.3) degrees. Maximal mixing is rejected at the equivalent of 5.4 standard deviations.

Published
2004

38. MOON(MO OBSERVATORY OF NEUTRINOS) FOR NEUTRINO STUDIES BY DOUBLE BETA DECAYS AND LOW ENERGY SOLAR NEUTRINOS

Author

R. Hazama, Michael Finger Jr, Vladimir Kekelidze, A. Para, A. Titov, S. R. Elliott, J. F. Wilkerson, A. Rjazantsev, M. Nomachi, Y. Shichijo, K Fushimi, Y. Sugaya, A. Sisakian, D.I. Will, Hironobu Nakamura, T. Shima, K. Ichihara, M. B. Greenfield, K. Kuroda, R. G. H. Robertson, Y. Ikegami, P. J. Doe, Y. Shimada, S. Yoshida, V. Vatulin, Hiroyasu Ejiri, T. Itahashi, V. Kutsalo, Jonathan Engel, O.E. Vilches, K. Matsuoka, L. Manouilov, A. Gorin, V. Voronon, and Grigori Shirkov

Subjects
Nuclear physics, Physics, Low energy, Observatory, Solar neutrino, Beta (plasma physics), Astronomy, Solar neutrino problem, Neutrino
Published
2004
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39. 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

40. 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
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41. Spectroscopy of double-beta and inverse-beta decays from 100Mo for neutrinos

Author

H, Ejiri, J, Engel, R, Hazama, P, Krastev, N, Kudomi, and R G, Robertson

Abstract

Spectroscopic studies of two beta rays from 100Mo are shown to be of potential interest for investigating both the Majorana nu mass by neutrinoless double beta decay (0nubetabeta) and low energy solar nu's by inverse beta decay. With a multiton 100Mo detector, coincidence studies of correlated betabeta from 0nubetabeta, together with the large Q value ( Q(betabeta)), permit identification of the nu-mass term with a sensitivity of approximately 0.03 eV. Correlation studies of the inverse beta decay and the successive beta decay of 100Tc, together with the large capture rates for low energy solar nu's, make it possible to detect, in real time, individual low energy solar nu in the same detector.

Published
1999

42. PP094. A comparison of gestational changes in urinary excretion of magnesium with those of calcium

Author

Hideto Yamada, Hiroki Morita, M. Yamasaki, N. Makihara, and R. Hazama

Subjects
Creatinine, medicine.medical_specialty, Pregnancy, business.industry, Magnesium, Urinary system, Obstetrics and Gynecology, chemistry.chemical_element, Urine, Calcium, medicine.disease, Preeclampsia, Excretion, chemistry.chemical_compound, Endocrinology, chemistry, Internal medicine, Internal Medicine, Medicine, business
Abstract

Introduction Magnesium is one of the essential minerals required in various cellular functions. Some investigators have postulated that some aspects of pathophysiology in preeclampsia could be associated with alteration in regulatory mechanisms of the mineral. However, gestational changes in absorption, excretion and blood concentration of magnesium have remained less elucidated compared with those of calcium, which is another important mineral forming a divalent cation. Objectives The purpose of this study was to clarify if urinary excretion of magnesium during pregnancy might be altered compared with those of calcium. Methods Sixty specimens of 24 h urine and 586 samples of spot urine were collected from healthy pregnant women who gave consent. Determination of the minerals were according to Orthocresol-phthalein complexone method for calcium, and xylidyl blue method for magnesium. Urinary creatinine was determined by Jaffe Method. Results Daily excretions of magnesium determined with 24 h samples were 60, 70, 81, 65, and 102 mg in 1st, 2nd, and early 3rd trimesters, term, and postpartum 4weeks, respectively. There were no statistical differences among the values. Those of calcium were 174, 186, 139, 52, and 40 mg, respectively. The values in term and in postpartum were significantly lower than those in 1st through early 3rd trimesters. The Mg/Cr ratios (mg/mg Cr) determined with spot urine samples were 0.064, 0.071, 0.066, 0.067, and 0.086, in 1st, 2nd, and early 3rd trimesters, term, and postpartum 4weeks, respectively. The value of Mg/Cr in postpartum was significantly higher than the values in pregnant period. The Ca/Cr ratios (mg/mg Cr) were 0.164, 0.163, 0.135, 0.118, and 0.090, respectively. There was a trend of decreasing pattern in changes of Ca/Cr from 2nd trimester to postpartum. Conclusion It is suggested that there is a mechanism of preservation of calcium in the late phase of pregnancy or puerperal period by reducing urinary excretion of the mineral. However, human pregnancy does not seem to show such a function controlling magnesium metabolism.

Published
2012
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43. Study of48Ca double beta decay with CANDLES

Author

I Ogawa, T Kishimoto, S Umehara, G Ito, K Yasuda, M Wada, K Matsuoka, M Nomachi, K Fushimi, R Hazama, H Ohsumi, K Okada, Y Tamagawa, and S Yoshida

Subjects
Physics, History, Particle physics, Q value, Detector, Scintillator, Lepton number, Computer Science Applications, Education, Nuclear physics, MAJORANA, Double beta decay, High Energy Physics::Experiment, Neutrino
Abstract

CANDLES is the project to search for double beta decay of 48Ca by using CaF2 scintillators. If neutrinos have Majorana mass they violate lepton number conservation and neutrino-less double beta decay (OvDBD) can then take place. Therefore the study of the 0 vDBD is one of the most fundamental researches to be carried out in a coming decade. We have been studying the DBD of 48Ca using CaF2 scintillators. The Q value of 48Ca is the highest (4.27 MeV) among potential DBD nuclei. It is far above energies of γ-rays from natural radio-activities (maximum 2.615 MeV from 208TI decay), therefore we can naturally expect small backgrounds in the energy region we are interested in. Required performances for the detector are radio-purity, good background rejection efficiency and good energy resolution. We have constructed CANDLES III detector in our laboratory at sea level, which consists of 60 CaF2 crystals with the total mass of 191 kg. We are studying the basic performances of the system, including the light collection, position reconstruction and background rejection. On the bases of experiences in CANDLES III, the CANDLES project will be scaled up to several tons of calcium to have the sensitivity to the mass region of interest.

Published
2010
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44. Study of double beta decay of48Ca with CANDLES

Author

Y Hirano, T Kishimoto, I Ogawa, R Hazama, S Umehara, K Matsuoka, G Ito, Y Tsubota, and the CANDLES Collaboration

Subjects
Physics, History, Particle physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Scintillator, Computer Science Applications, Education, Nuclear physics, Double beta decay, Scintillation counter, High Energy Physics::Experiment
Abstract

CANDLES system had proposed for the study of double beta decay of 48Ca by using of undoped CaF2 scintillator. We have constructed CANDLES III detector at sea level. The result of first performance check is described.

Published
2008
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45. Study of the design for the CANDLES trigger system

Author

G Ito, T Kishimoto, I Ogawa, S Umehara, Y Hirano, Y Tsubota, K Matsuoka, R Hazama, and the CANDLES Collaboration

Subjects
Physics, History, business.industry, Double beta decay, Detector, Plan (drawing), Construct (python library), Field-programmable gate array, business, Simulation, Computer hardware, Computer Science Applications, Education
Abstract

We are searching for 0ν double beta decay of 48Ca with CANDLES detector. We have a plan to construct a more larger detector underground from next year and considering the deadtime, we have to reduce background events at online trigger. Because FPGA is useful high integrated module, we are experimenting for the performance evaluation with prototype detector now.

Published
2008
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46. The MOON-1 detector construction and the study of backgrounds from radioactive isotopes

Author

T Ogama, H Nakamura, H Ejiri, K Fushimi, K Ichihara, K Matsuoka, M Nomachi, R Hazama, S Umehara, S Yoshida, T Sakiuchi, V H Hai, Y Sugaya, and Moon collaboration

Subjects
Physics, History, Radionuclide, Physics::Instrumentation and Detectors, Position resolution, Detector, Scintillator, Physics::Geophysics, Computer Science Applications, Education, Nuclear physics, Physics::Space Physics, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics
Abstract

MOON is a multilayer system of plastic scintillators and 100Mo films for 100Mo 0νββ decays. A prototype detector MOON-1 was built with 6 layers of plastic scintillators and 142g of 100Mo films for background (BG), energy and position resolution studies of the MOON detector. No serious BG from natural radioactive isotopes (RI) for 0νββ detection was found.

Published
2006
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48. [A family of von Recklinghausen's neurofibromatosis complicated by mononeuritis multiplex, bilateral acoustic neurinomas, and falx and spinal meningiomas]

Author

M, Mori, S, Morisaki, R, Hazama, M, Tsujihata, S, Nagataki, M, Yonekura, T, Moriyama, and K, Mori

Subjects
Adult, Male, Neurofibromatosis 1, Brain Neoplasms, Neuroma, Acoustic, Syndrome, Middle Aged, Pedigree, Neoplasms, Multiple Primary, Polyneuropathies, Meningeal Neoplasms, Humans, Female, Spinal Cord Neoplasms, Child, Meningioma
Abstract

A family of von Recklinghausen's disease complicated by multiple diverse primary brain tumors was reported. Case 1. The proband, born in 1923, was admitted to the Nagasaki University Hospital on March 11, 1974, for evaluation of headache and hearing loss. Neurological examination disclosed: decreased visual acuity on the right: bilateral choked discs; anisocoria, right pupil wider than left; right blepharoptosis; artificially fixed right eye; right facial palsy; markedly impaired hearing with negative vestibular responses to caloric test; paralysis of the right soft palate and vocal cord; atrophy of the right side of the tongue; right claw hand with positive Froment's sign; left drop foot; loss of deep reflexes on the left arm and legs; positive Babinski on the right. Nerve conduction studies revealed failure to evoke muscle action potential in response to electric nerve stimulation on the left ulnar and right superficial peroneal nerves. Needle electromyography showed no motor unit potentials in the left first dorsal interosseus and right anterior tibial muscles. Sensory nerve action potentials could not be evoked on any nerves tested. X-ray films showed enlargement of the internal auditory passages, falx tumor on brain scan and carotid angiography, and spinal tumor on myelography. At craniotomy, a 7 X 5.5 X 4 cm falx meningioma was removed. At suboccipital craniotomy performed five weeks later, right acoustic neurinoma measuring 1.5 cm in diameter was removed. Case 2. This relative, born in 1945, was the son of the proband. A spinal meningioma at C 7-T 1 was removed in 1957. However, he could not walk after operation and died of pneumonia two years later.(ABSTRACT TRUNCATED AT 250 WORDS)

Published
1985

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