# The 58th Winter Nuclear & Particle Physics Conference 2021

9-12 February 2021
Virtual Meeting
America/Toronto timezone

## Precision Branching-Ratio Measurement for the Superallowed Fermi $\beta$ Emitter 18Ne

10 Feb 2021, 16:45
15m
Virtual Meeting

#### Virtual Meeting

Electroweak and Higgs Physics

### Speaker

Dr Kushal Kapoor (University of Regina)

### Description

The precise studies of nuclear $\beta$ decays between I$^{\pi}$ = 0$^{+}$ isobaric analogue states provide stringent tests of electroweak interactions. Precision measurements of the ft values for superallowed $\beta$ Fermi emitters between isospin T = 1 states has provided by far, the most precise value of V$_{ud}$, the up-down element of the Cabibbo-Kobayashi-Maskawa (CKM) quark mixing matrix. Recent survey on superallowed decay, recommended value of V$_{ud}$ is one standard deviation smaller than its previous value and is due to a new theoretical evaluation of a nucleus independent radiative correction that is universally applied to the ft values. As a result, the top row test of CKM unitarity now violates unity at the 3.3$\sigma$ level, which has motivated a renewed search for any and all possible trivial sources that may explain this apparent discrepancy.
In this work, we focus on a new measurement of the superallowed branching ratio of $^{18}$Ne decay that was deduced from an experiment performed at the GANIL facility in France. To date, the ft value for this decay has not yet been determined precisely enough to be included in the evaluation of V$_{ud}$ and it is perhaps the most interesting case for constraining model dependencies that arise in a second set of theoretical corrections accounting for isospin symmetry breaking effects. A detailed description of the experiment, analysis and preliminary results will be presented.

Please select: Experiment or Theory Experiment kapoor.phys@gmail.com

### Primary authors

Dr Kushal Kapoor (University of Regina) Prof. Gwen Grinyer (University of Regina)

### Presentation Materials

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