Determination of the Weak Axial Vector Coupling λ=g_{A}/g_{V} from a Measurement of the β-Asymmetry Parameter A in Neutron Beta Decay

Mund, D.; Märkisch, B.; Deissenroth, M.; Krempel, J.; Schumann, Marc; Abele, H.; Petoukhov, A.; Soldner, T. (2013). Determination of the Weak Axial Vector Coupling λ=g_{A}/g_{V} from a Measurement of the β-Asymmetry Parameter A in Neutron Beta Decay. Physical review letters, 110(17) American Physical Society 10.1103/PhysRevLett.110.172502

[img] Text
determinatio weak.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (351kB) | Request a copy

We report on a new measurement of the neutron beta-asymmetry parameter A with the instrument \perkeo. Main advancements are the high neutron polarization of P=99.7(1) from a novel arrangement of super mirror polarizers and reduced background from improvements in beam line and shielding. Leading corrections were thus reduced by a factor of 4, pushing them below the level of statistical error and resulting in a significant reduction of systematic uncertainty compared to our previous experiments. From the result A0=−0.11996(58), we derive the ratio of the axial-vector to the vector coupling constant λ=gA/gV=−1.2767(16)

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)
10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)

UniBE Contributor:

Schumann, Marc

Subjects:

500 Science > 530 Physics

ISSN:

0031-9007

Publisher:

American Physical Society

Language:

English

Submitter:

Elena Kirillova

Date Deposited:

03 Sep 2014 09:24

Last Modified:

20 Jan 2016 11:44

Publisher DOI:

10.1103/PhysRevLett.110.172502

ArXiv ID:

1204.0013v1

BORIS DOI:

10.7892/boris.49314

URI:

https://boris.unibe.ch/id/eprint/49314

Actions (login required)

Edit item Edit item
Provide Feedback