Precision measurement of the neutron's beta asymmetry using ultra-cold neutrons

M. Makela, H. O. Back, D. Melconian, B. Plaster

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

A measurement of Aβ, the correlation between the electron momentum and neutron (n) spin (the beta asymmetry) in n beta-decay, together with the n lifetime, provides a method for extracting fundamental parameters for the charged-current weak interaction of the nucleon. In particular when combined with decay measurements, one can extract the Vud element of the CKM matrix, a critical element in CKM unitarity tests. By using a new SD2 super-thermal source at LANSCE, large fluxes of UCN (ultra-cold neutrons) are expected for the UCNA project. These UCN will be 100% polarized using a 7 T magnetic field, and directed into the β spectrometer. This approach, together with an expected large reduction in backgrounds, will result in an order of magnitude reduction in the critical systematic corrections associated with current n β-asymmetry measurements. This paper will give an overview of the UCNA Aβ measurement as well as an update on the status of the experiment.

Original languageEnglish
Title of host publicationPARTICLES AND NUCLEI
Subtitle of host publicationSeventeenth Internatinal Conference on Particles and Nuclei
Pages808-810
Number of pages3
DOIs
StatePublished - 2006
EventPARTICLES AND NUCLEI: Seventeenth Internatinal Conference on Particles and Nuclei - Santa Fe, NM, United States
Duration: Oct 23 2005Oct 30 2005

Publication series

NameAIP Conference Proceedings
Volume842
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferencePARTICLES AND NUCLEI: Seventeenth Internatinal Conference on Particles and Nuclei
Country/TerritoryUnited States
CitySanta Fe, NM
Period10/23/0510/30/05

Keywords

  • CKM unitarity
  • Neutron beta asymmetry
  • Ultra-cold neutron source

ASJC Scopus subject areas

  • Physics and Astronomy (all)

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