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We have set limits on contributions of scalar interactions to nuclear betadecay. A magneto-optical trap (MOT) provides a localized source of atomssuspended in space, so the low-energy recoiling nuclei can freely escape and bedetected in coincidence with the beta. This allows reconstruction of theneutrino momentum, and the measurement of the beta-neutrino correlation, in amore direct fashion than previously possible. The beta-neutrino correlationparameter of the 0+ to 0+ pure Fermi decay of 38mK is$\tilde{a}$=0.9981+-0.0030+-0.0037, consistent with the standard modelprediction a=1.Comment: 4 pages, 3 figures, accepted by Phys. Rev. Lett., centroid change

physical review letters

Scalar Interaction Limits from the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi><mml:mtext mathvariant="normal">−</mml:mtext><mml:mi>ν</mml:mi></mml:math>Correlation of Trapped Radioactive Atoms

Scalar Interaction Limits from theβ−νCorrelation of Trapped Radioactive Atoms