Measurement of Day and Night Neutrino Energy Spectra at SNO and Constraints on Neutrino Mixing Parameters

Measurement of Day and Night Neutrino Energy Spectra at SNO and Constraints on Neutrino Mixing Parameters

Q. R. Ahmad,R. C. Allen,Thomas Andersen,J. D. Anglin,J. C. Barton,E. W. Beier,M. Bercovitch,J. Bigu,S. D. Biller,R. A. Black,I. Blevis,R. J. Boardman,J. Boger,E. Bonvin,M. G. Boulay,M. G. Bowler,T. J. Bowles,S. J. Brice,M. C. Browne,T. V. Bullard,G. Bühler,J. Cameron,Y. D. Chan,H. H. Chen,M. Chen,X. Chen,B. T. Cleveland,E. T. H. Clifford,J. H. M. Cowan,D. F. Cowen,G. A. Cox,X. Dai,Ferenc (Jacob Rolf) Dalnoki-Veress,W. F. Davidson,P. J. Doe,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,A. P. Ferraris,R. J. Ford,J. A. Formaggio,M. M. Fowler,K. Frame,E. D. Frank,W. Frati,N. Gagnon,J. V. Germani,S. Gil,K. Graham,D. R. Grant,R. L. Hahn,A. L. Hallin,E. D. Hallman,A. S. Hamer,A. A. Hamian,W. B. Handler,R. U. Haq,C. K. Hargrove,P. J. Harvey,R. Hazama,K. M. Heeger,W. J. Heintzelman,J. Heise,R. L. Helmer,J. D. Hepburn,H. Heron,J. Hewett,A. Hime,M. Howe,J. G. Hykawy,M. C. P. Isaac,Formaggio Ja,N. A. Jelley,C. Jillings,G. Jonkmans,K. Kazkaz,P. T. Keener,J. R. Klein,A. B. Knox,R. J. Komar,R. Kouzes,T. Kutter,Christopher Kyba,J. Law,I. T. Lawson,M. Lay,H. W. Lee,K. T. Lesko,J. R. Leslie,I. Levine,W. Locke,S. Luoma,J. Lyon,S. Majerus,H. B. Mak,Jose Maneira,J. Manor,A. D. Marino,N. McCauley,A. B. McDonald,D. S. McDonald,K. McFarlane,G. McGregor,R. Meijer Drees,C. Mifflin,G. G. Miller,G. Milton,B. A. Moffat,M. Moorhead,C. W. Nally,M. S. Neubauer,F. M. Newcomer,H. S. Ng,A. J. Noble,E. B. Norman,V. M. Novikov,M. O'neill,C. E. Okada,R. W. Ollerhead,M. Omori,John Orrell,S. M. Oser,A. W. P. Poon,T. J. Radcliffe,A. Roberge,B. C. Robertson,R. G. H. Robertson,S. S. E. Rosendahl,J. K. Rowley,V. L. Rusu,E. Saettler,K. K. Schaffer,M. H. Schwendener,A. Schülke,H. Seifert,M. Shatkay,J. J. Simpson,Neubauer Ms,D. Sinclair,P. Skensved,A. R. Smith,M. W. E. Smith,T. Spreitzer,N. Starinsky,T. D. Steiger,R. G. Stokstad,L. C. Stonehill,R. S. Storey,B. Sur,R. Tafirout,N. Tagg,N. W. Tanner,R. K. Taplin,M. Thorman,P. M. Thornewell,P. T. Trent,Y. I. Tserkovnyak,R. Van Berg,R. G. Van De Water,C. J. Virtue,C. E. Waltham,J.-X. Wang,D. L. Wark,N. West,J. B. Wilhelmy,J. F. Wilkerson,Jeanne Wilson,P. Wittich,J. M. Wouters,Minfang Yeh;Q. R. Ahmad;R. C. Allen;Thomas Andersen;J. D. Anglin;J. C. Barton;E. W. Beier;M. Bercovitch;J. Bigu;S. D. Biller;R. A. Black;I. Blevis;R. J. Boardman;J. Boger;E. Bonvin;M. G. Boulay;M. G. Bowler;T. J. Bowles;S. J. Brice;M. C. Browne;T. V. Bullard;G. Bühler;J. Cameron;Y. D. Chan;H. H. Chen;M. Chen;X. Chen;B. T. Cleveland;E. T. H. Clifford;J. H. M. Cowan;D. F. Cowen;G. A. Cox;X. Dai;Ferenc (Jacob Rolf) Dalnoki-Veress;W. F. Davidson;P. J. Doe;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;A. P. Ferraris;R. J. Ford;J. A. Formaggio;M. M. Fowler;K. Frame;E. D. Frank;W. Frati;N. Gagnon;J. V. Germani;S. Gil;K. Graham;D. R. Grant;R. L. Hahn;A. L. Hallin;E. D. Hallman;A. S. Hamer;A. A. Hamian;W. B. Handler;R. U. Haq;C. K. Hargrove;P. J. Harvey;R. Hazama;K. M. Heeger;W. J. Heintzelman;J. Heise;R. L. Helmer;J. D. Hepburn;H. Heron;J. Hewett;A. Hime;M. Howe;J. G. Hykawy;M. C. P. Isaac;Formaggio Ja;N. A. Jelley;C. Jillings;G. Jonkmans;K. Kazkaz;P. T. Keener;J. R. Klein;A. B. Knox;R. J. Komar;R. Kouzes;T. Kutter;Christopher Kyba;J. Law;I. T. Lawson;M. Lay;H. W. Lee;K. T. Lesko;J. R. Leslie;I. Levine;W. Locke;S. Luoma;J. Lyon;S. Majerus;H. B. Mak;Jose Maneira;J. Manor;A. D. Marino;N. McCauley;A. B. McDonald;D. S. McDonald;K. McFarlane;G. McGregor;R. Meijer Drees;C. Mifflin;G. G. Miller;G. Milton;B. A. Moffat;M. Moorhead;C. W. Nally;M. S. Neubauer;F. M. Newcomer;H. S. Ng;A. J. Noble;E. B. Norman;V. M. Novikov;M. O'neill;C. E. Okada;R. W. Ollerhead;M. Omori;John Orrell;S. M. Oser;A. W. P. Poon;T. J. Radcliffe;A. Roberge;B. C. Robertson;R. G. H. Robertson;S. S. E. Rosendahl;J. K. Rowley;V. L. Rusu;E. Saettler;K. K. Schaffer;M. H. Schwendener;A. Schülke;H. Seifert;M. Shatkay;J. J. Simpson;Neubauer Ms;D. Sinclair;P. Skensved;A. R. Smith;M. W. E. Smith;T. Spreitzer;N. Starinsky;T. D. Steiger;R. G. Stokstad;L. C. Stonehill;R. S. Storey;B. Sur;R. Tafirout;N. Tagg;N. W. Tanner;R. K. Taplin;M. Thorman;P. M. Thornewell;P. T. Trent;Y. I. Tserkovnyak;R. Van Berg;R. G. Van De Water;C. J. Virtue;C. E. Waltham;J.-X. Wang;D. L. Wark;N. West;J. B. Wilhelmy;J. F. Wilkerson;Jeanne Wilson;P. Wittich;J. M. Wouters;Minfang Yeh;
physical review letters 2002 Vol. 89 pp. 011302-
230
yeh2002physicalmeasurement

Abstract

The Sudbury Neutrino Observatory (SNO) has measured day and night solar neutrino energy spectra and rates. For charged current events, assuming an undistorted 8B spectrum, the night minus day rate is 14.0%±6.3%−1.4+1.5% of the average rate. If the total flux of active neutrinos is additionally constrained to have no asymmetry, the νe asymmetry is found to be 7.0%±4.9%−1.2+1.3%. A global solar neutrino analysis in terms of matter-enhanced oscillations of two active flavors strongly favors the large mixing angle solution.

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