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Precision measurement of the $\beta$-asymmetry in spin-polarized $^{37}\mathrm{K}$ decay
- Source :
- Phys. Rev. Lett. 120, 062502 (2018)
- Publication Year :
- 2017
-
Abstract
- Using TRIUMF's neutral atom trap, TRINAT, for nuclear $\beta$ decay, we have measured the $\beta$ asymmetry with respect to the initial nuclear spin in $^{37}\mathrm{K}$ to be $A_\beta=-0.5707(13)_\mathrm{syst}(13)_\mathrm{stat}(5)_\mathrm{pol}$, a 0.3% measurement. This is the best relative accuracy of any $\beta$-asymmetry measurement in a nucleus or the neutron, and is in agreement with the standard model prediction $-0.5706(7)$. We compare constraints on physics beyond the standard model with other $\beta$-decay measurements, and improve the value of $V_\mathrm{ud}$ measured in this mirror nucleus by a factor of 4.
- Subjects :
- Nuclear Experiment
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 120, 062502 (2018)
- Publication Type :
- Report
- Accession number :
- edsarx.1706.00414
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.120.062502