Measurement of the neutron decay electron-antineutrino angular correlation by the aCORN experiment

被引：23

作者：

Hassan, M. T. ^{[1
,6
]}

Byron, W. A. ^{[1
,7
]}

Darius, G. ^{[1
]}

DeAngelis, C. ^{[1
]}

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

Collett, B. ^{[2
]}

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

Komives, A. ^{[3
]}

Noid, G. ^{[4
]}

Stephenson, E. J. ^{[4
]}

Bateman, F. ^{[5
]}

Dewey, M. S. ^{[5
]}

Gentile, T. R. ^{[5
]}

Mendenhall, M. P. ^{[5
,8
]}

Nico, J. S. ^{[5
]}

机构：

[1] Tulane Univ, Dept Phys & Engn Phys, New Orleans, LA 70118 USA

[2] Hamilton Coll, Phys Dept, Clinton, NY 13323 USA

[3] DePauw Univ, Dept Phys & Astron, Greencastle, IN 46135 USA

[4] Indiana Univ, CEEM, Bloomington, IN 47408 USA

[5] NIST, Gaithersburg, MD 20899 USA

[6] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[7] Univ Washington, Dept Phys, Seattle, WA 98195 USA

[8] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

来源：

PHYSICAL REVIEW C | 2021年 / 103卷 / 04期

基金：

美国国家科学基金会;

关键词：

BETA-DECAY; CORRELATION-COEFFICIENTS; ASYMMETRY; SPECTRUM; ENERGY;

D O I：

10.1103/PhysRevC.103.045502

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：

The aCORN experiment measures the neutron-decay electron-antineutrino correlation (a coefficient) using a novel method based on an asymmetry in proton time-of-flight for events where the beta electron and recoil proton are detected in delayed coincidence. We report the data analysis and result from the second run at the NIST Center for Neutron Research, using the high-flux cold neutron beam on the new NG-C neutron guide end position: a = -0.10758 +/- 0.00136(stat) +/- 0.00148(sys). This is consistent within uncertainties with the result from the first aCORN run on the NG-6 cold neutron beam. Combining the two aCORN runs, we obtain a = -0.10782 +/- 0.00124(stat) +/- 0.00133(sys), which has an overall relative standard uncertainty of 1.7%. The corresponding result for the ratio of weak coupling constants lambda = G(A)/G(V) is lambda = -1.2796 +/- 0.0062.

引用

页数：20

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