Precision measurement of neutrino oscillation parameters with KamLAND

被引：682

作者：

Abe, S. ^{[1
]}

Ebihara, T. ^{[1
]}

Enomoto, S. ^{[1
]}

Furuno, K. ^{[1
]}

Gando, Y. ^{[1
]}

Ichimura, K. ^{[1
]}

Ikeda, H. ^{[1
]}

Inoue, K. ^{[1
]}

Kibe, Y. ^{[1
]}

Kishimoto, Y. ^{[1
]}

Koga, M. ^{[1
]}

Kozlov, A. ^{[1
]}

Minekawa, Y. ^{[1
]}

Mitsui, T. ^{[1
]}

Nakajima, K. ^{[1
]}

Nakamura, K. ^{[1
]}

Nakamura, M. ^{[1
]}

Owada, K. ^{[1
]}

Shimizu, I. ^{[1
]}

Shimizu, Y. ^{[1
]}

Shirai, J. ^{[1
]}

Suekane, F. ^{[1
]}

Suzuki, A. ^{[1
]}

Takemoto, Y. ^{[1
]}

Tamae, K. ^{[1
]}

Terashima, A. ^{[1
]}

Watanabe, H. ^{[1
]}

Yonezawa, E. ^{[1
]}

Yoshida, S. ^{[1
]}

Busenitz, J. ^{[2
]}

Classen, T. ^{[2
]}

Grant, C. ^{[2
]}

Keefer, G. ^{[2
]}

Leonard, D. S. ^{[2
]}

McKee, D. ^{[2
]}

Piepke, A. ^{[2
]}

Decowski, M. P. ^{[3
,4
]}

Detwiler, J. A. ^{[3
,4
]}

Freedman, S. J. ^{[3
,4
]}

Fujikawa, B. K. ^{[3
,4
]}

Gray, F. ^{[3
,4
]}

Guardincerri, E. ^{[3
,4
]}

Hsu, L. ^{[3
,4
]}

Kadel, R. ^{[3
,4
]}

Lendvai, C. ^{[3
,4
]}

Luk, K. -B. ^{[3
,4
]}

Murayama, H. ^{[3
,4
]}

O'Donnell, T. ^{[3
,4
]}

Steiner, H. M. ^{[3
,4
]}

机构：

[1] Tohoku Univ, Res Ctr Neutrino Sci, Sendai, Miyagi 9808578, Japan

[2] Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 USA

[3] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[4] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[5] CALTECH, WK Kellogg Radiat Lab, Pasadena, CA 91125 USA

[6] Colorado State Univ, Dept Phys, Ft Collins, CO 80523 USA

[7] Drexel Univ, Dept Phys, Philadelphia, PA 19104 USA

[8] Univ Hawaii Manoa, Dept Phys & Astron, Honolulu, HI 96822 USA

[9] Kansas State Univ, Dept Phys, Manhattan, KS 66506 USA

[10] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

[11] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

[12] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[13] Triangle Univ Nucl Lab, Durham, NC 27708 USA

[14] Duke Univ, Dept Phys, Durham, NC 27706 USA

[15] N Carolina Cent Univ, Dept Phys, Durham, NC 27707 USA

[16] Univ N Carolina, Chapel Hill, NC USA

[17] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

[18] CEN Bordeaux Gradignan, IN2P3, CNRS, F-33175 Gradignan, France

[19] Univ Bordeaux 1, F-33175 Gradignan, France

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.100.221803

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The KamLAND experiment has determined a precise value for the neutrino oscillation parameter Delta m(21)(2) and stringent constraints on theta(12). The exposure to nuclear reactor antineutrinos is increased almost fourfold over previous results to 2.44x10(32) proton yr due to longer livetime and an enlarged fiducial volume. An undistorted reactor (nu) over bar (e) energy spectrum is now rejected at > 5 sigma. Analysis of the reactor spectrum above the inverse beta decay energy threshold, and including geoneutrinos, gives a best fit at Delta m(21)(2)=7.58(-0.13)(+0.14)(stat)(-0.15)(+0.15)(syst) x 10(-5) eV(2) and tan(2)theta(12)=0.56(-0.07)(+0.10)(stat)(-0.06)(+0.10)(syst). Local Delta chi(2) minima at higher and lower Delta m(21)(2) are disfavored at > 4 sigma. Combining with solar neutrino data, we obtain Delta m(21)(2)=7.59(-0.21)(+0.21) x 10(-5) eV(2) and tan(2)theta(12)=0.47(-0.05)(+0.06).

引用

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