Measurement of the Electron-Antineutrino Angular Correlation in Neutron β Decay

被引：28

作者：

Darius, G. ^{[1
]}

Byron, W. A. ^{[1
]}

DeAngelis, C. R. ^{[1
]}

Hassan, M. T. ^{[1
]}

Wietfeldt, F. E. ^{[1
]}

Collett, B. ^{[2
]}

Jones, G. L. ^{[2
]}

Dewey, M. S. ^{[3
]}

Mendenhall, M. P. ^{[3
]}

Nico, J. S. ^{[3
]}

Park, H. ^{[3
,6
]}

Komives, A. ^{[4
]}

Stephenson, E. J. ^{[5
]}

机构：

[1] Tulane Univ, New Orleans, LA 70118 USA

[2] Hamilton Coll, Clinton, NY 13323 USA

[3] NIST, Gaithersburg, MD 20899 USA

[4] Depauw Univ, Greencastle, IN 46135 USA

[5] Indiana Univ, Bloomington, IN 47408 USA

[6] Korea Res Inst Stand & Sci, Daejeon 34113, South Korea

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 119卷 / 04期

基金：

美国国家科学基金会;

关键词：

STANDARD-MODEL; TESTS; SPECTRUM; RECOIL; ENERGY;

D O I：

10.1103/PhysRevLett.119.042502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first result for the electron-antineutrino angular correlation (a coefficient) in free neutron beta decay from the aCORN experiment. aCORN uses a novel method in which the a coefficient is proportional to an asymmetry in proton time of flight for events where the beta electron and recoil proton are detected in delayed coincidence. Data are presented from a 15 month run at the NIST Center for Neutron Research. We obtained a = -0.1090 +/- 0.0030(stat) +/- 0.0028(sys), the most precise measurement of the neutron a coefficient reported to date.

引用

页数：5

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