B Longfellow, A T Gallant, G H Sargsyan, M T Burkey, T Y Hirsh, G Savard, N D Scielzo, L Varriano, M Brodeur, D P Burdette, J A Clark, D Lascar, K D Launey, P Mueller, D Ray, K S Sharma, A A Valverde, G L Wilson, X L Yan
A precision measurement of the β^{+} decay of ^{8}B was performed using the Beta-decay Paul Trap to determine the β-ν angular correlation coefficient a_{βν}. The experimental results were combined with new ab initio symmetry-adapted no-core shell-model calculations to yield the second-most precise measurement from Gamow-Teller decays, a_{βν}=-0.3345±0.0019_{stat}±0.0021_{syst}. This value agrees with the standard model value of -1/3 and improves uncertainties in ^{8}B by nearly a factor of 2...
April 5, 2024: Physical Review Letters