Improved measurement of the reactor antineutrino flux and spectrum at Daya Bay

被引：115

作者：

An, F. P. ^{[1
]}

Balantekin, A. B. ^{[2
]}

Band, H. R. ^{[3
]}

Bishai, M. ^{[4
]}

Blyth, S. ^{[5
,6
]}

Cao, D. ^{[7
]}

Cao, G. F. ^{[8
]}

Cao, J. ^{[8
]}

Cen, W. R. ^{[8
]}

Chan, Y. L. ^{[9
]}

Chang, J. F. ^{[8
]}

Chang, L. C. ^{[10
]}

Chang, Y. ^{[6
]}

Chen, H. S. ^{[8
]}

Chen, Q. Y. ^{[11
]}

Chen, S. M. ^{[12
]}

Chen, Y. X. ^{[13
]}

Chen, Y. ^{[14
]}

Cheng, J. -H. ^{[10
]}

Cheng, J. ^{[11
]}

Cheng, Y. P.

Cheng, Z. K. ^{[15
]}

Cherwinka, J. J. ^{[2
]}

Chu, M. C. ^{[9
]}

Chukanov, A. ^{[16
]}

Cummings, J. P. ^{[17
]}

de Arcos, J.

Deng, Z. Y.

Ding, X. F. ^{[8
]}

Ding, Y. Y.

Diwan, M. V. ^{[4
]}

Dolgareva, M. ^{[16
]}

Dove, J. ^{[18
]}

Dwyer, D. A. ^{[19
]}

Edwards, W. R. ^{[19
]}

Gill, R. ^{[4
]}

Gonchar, M. ^{[16
]}

Gong, G. H. ^{[12
]}

Gong, H. ^{[12
]}

Grassi, M. ^{[8
]}

Gu, W. Q. ^{[20
]}

Guan, M. Y. ^{[8
]}

Guo, L. ^{[12
]}

Guo, R. P. ^{[8
]}

Guo, X. H. ^{[21
]}

Guo, Z. ^{[12
]}

Hackenburg, R. W. ^{[4
]}

Han, R. ^{[13
]}

Hans, S. ^{[4
]}

He, M. ^{[8
]}

机构：

[1] East China Univ Sci & Technol, Inst Modern Phys, Shanghai, Peoples R China

[2] Univ Wisconsin, Madison, WI 53706 USA

[3] Yale Univ, Dept Phys, New Haven, CT 06520 USA

[4] Brookhaven Natl Lab, Upton, NY 11973 USA

[5] Natl Taiwan Univ, Dept Phys, Taipei, Taiwan

[6] Natl United Univ, Miaoli, Taiwan

[7] Nanjing Univ, Nanjing, Jiangsu, Peoples R China

[8] Inst High Energy Phys, Beijing, Peoples R China

[9] Chinese Univ Hong Kong, Hong Kong, Hong Kong, Peoples R China

[10] Natl Chiao Tung Univ, Inst Phys, Hsinchu, Taiwan

[11] Shandong Univ, Jinan, Peoples R China

[12] Tsinghua Univ, Dept Engn Phys, Beijing, Peoples R China

[13] North China Elect Power Univ, Beijing, Peoples R China

[14] Shenzhen Univ, Shenzhen, Peoples R China

[15] Sun Yat Sen Zhongshan Univ, Guangzhou, Guangdong, Peoples R China

[16] Joint Inst Nucl Res, Dubna, Russia

[17] Siena Coll, New York, NY 12211 USA

[18] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

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

[20] Shanghai Jiao Tong Univ, Shanghai Lab Particle Phys & Cosmol, Dept Phys & Astron, Shanghai, Peoples R China

[21] Beijing Normal Univ, Beijing, Peoples R China

[22] Univ Houston, Dept Phys, Houston, TX 77204 USA

[23] Virginia Tech, Ctr Neutrino Phys, Blacksburg, VA 24061 USA

[24] China Inst Atom Energy, Beijing, Peoples R China

[25] Univ Sci & Technol China, Hefei, Peoples R China

[26] Nankai Univ, Sch Phys, Tianjin, Peoples R China

[27] Univ Cincinnati, Dept Phys, Cincinnati, OH 45221 USA

[28] Temple Univ, Dept Phys, Coll Sci & Technol, Philadelphia, PA 19122 USA

[29] Dongguan Univ Technol, Dongguan, Peoples R China

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

[31] Univ Hong Kong, Dept Phys, Pokfulam, Hong Kong, Peoples R China

[32] Charles Univ Prague, Fac Math & Phys, Prague, Czech Republic

[33] Princeton Univ, Joseph Henry Labs, Princeton, NJ 08544 USA

[34] Xi An Jiao Tong Univ, Sch Energy & Power Engn, Dept Nucl Sci & Technol, Xian, Peoples R China

[35] Pontificia Univ Catolica Chile, Inst Fis, Santiago, Spain

[36] CALTECH, Pasadena, CA 91125 USA

[37] Coll William & Mary, Williamsburg, VA 23187 USA

[38] Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA

[39] China Gen Nucl Power Grp, Changsha, Hunan, Peoples R China

[40] Natl Univ Def Technol, Coll Elect Sci & Engn, Changsha, Peoples R China

[41] Iowa State Univ, Ames, IA 50011 USA

[42] Chongqing Univ, Chongqing, Peoples R China

来源：

CHINESE PHYSICS C | 2017年 / 41卷 / 01期

基金：

美国国家科学基金会; 美国能源部; 中国国家自然科学基金;

关键词：

antineutrino flux; energy spectrum; reactor; Daya Bay; NEUTRON FISSION-PRODUCTS; LONG-BASE-LINE; OSCILLATIONS; CALIBRATION; THETA(13); SEARCH; SYSTEM; PU-239;

D O I：

10.1088/1674-1137/41/1/013002

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

A new measurement of the reactor antineutrino flux and energy spectrum by the Daya Bay reactor neutrino experiment is reported. The antineutrinos were generated by six 2.9 GW(th) nuclear reactors and detected by eight antineutrino detectors deployed in two near (560 m and 600 m flux-weighted baselines) and one far (1640 m flux-weighted baseline) underground experimental halls. With 621 days of data, more than 1.2 million inverse beta decay (IBD) candidates were detected. The IBD yield in the eight detectors was measured, and the ratio of measured to predicted flux was found to be 0.946 +/- 0.020 (0.992 +/- 0.021) for the Huber+Mueller (ILL+Vogel) model. A 2.9 sigma deviation was found in the measured IBD positron energy spectrum compared to the predictions. In particular, an excess of events in the region of 4-6 MeV was found in the measured spectrum, with a local significance of 4.4 sigma. A reactor antineutrino spectrum weighted by the IBD cross section is extracted for model-independent predictions.

引用

页数：36

共 66 条

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