Improved determination of the β-(ν)over-bare angular correlation coefficient a in free neutron decay with the aSPECT spectrometer

被引：33

作者：

Beck, M. ^{[1
]}

Guardia, F. Ayala ^{[1
]}

Borg, M. ^{[1
]}

Kahlenberg, J. ^{[1
]}

Horta, R. Munoz ^{[1
]}

Schmidt, C. ^{[1
]}

Wunderle, A. ^{[1
]}

Heil, W. ^{[1
]}

Maisonobe, R. ^{[2
]}

Simson, M. ^{[2
]}

Soldner, T. ^{[2
]}

Virot, R. ^{[2
]}

Zimmer, O. ^{[2
]}

Klopf, M. ^{[3
]}

Konrad, G. ^{[3
]}

Baessler, S. ^{[4
,5
]}

Glueck, F. ^{[6
]}

Schmidt, U. ^{[7
]}

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Phys, D-55128 Mainz, Germany

[2] Inst Laue Langevin, CS 20156, F-38042 Grenoble 9, France

[3] Tech Univ Wien, Atominst, A-1020 Vienna, Austria

[4] Univ Virginia, Dept Phys, Charlottesville, VA 22904 USA

[5] Oak Ridge Natl Lab, Bethel Valley Rd, Oak Ridge, TN 37831 USA

[6] Karlsruhe Inst Technol KIT, Inst Kernphys IKP, D-76344 Eggenstein Leopoldshafen, Germany

[7] Heidelberg Univ, Phys Inst, D-69120 Heidelberg, Germany

来源：

PHYSICAL REVIEW C | 2020年 / 101卷 / 05期

关键词：

BETA-ASYMMETRY; WORK FUNCTION; LOW-ENERGY; EMISSION; NUCLEAR; TEMPERATURE; ELECTRONS; DIFFUSION; SPECTRUM; COPPER;

D O I：

10.1103/PhysRevC.101.055506

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：

We report on a precise measurement of the electron-antineutrino angular correlation (a coefficient) in free neutron beta decay from the aSPECT experiment. The a coefficient is inferred from the recoil energy spectrum of the protons which are detected in 4 pi by the aSPECT spectrometer using magnetic adiabatic collimation with an electrostatic filter. Data are presented from a 100-day run at the Institut Laue Langevin in 2013. The sources of systematic errors are considered and included in the final result. We obtain a = -0.104 30(84) which is the most precise measurement of the neutron a coefficient to date. From this, the ratio of axial vector to vector coupling constants is derived giving vertical bar lambda vertical bar = 1.2677(28).

引用

页数：35

共 16 条

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