Scalar interaction limits from the beta-neutrino correlation of trapped radioactive atoms

Details Scalar interaction limits from the beta-neutrino correlation of trapped radioactive atoms Scalar interaction limits from the beta-neutrino correlation of trapped radioactive atoms

2004-12-14

arxiv.org/abs/nucl-ex/0412032v2

Phys.Rev.Lett. 94 (2005) 142501

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 3 figures, accepted by Phys. Rev. Lett., centroid changed

Scientific paper

10.1103/PhysRevLett.94.142501

We have set limits on contributions of scalar interactions to nuclear beta decay. A magneto-optical trap (MOT) provides a localized source of atoms suspended in space, so the low-energy recoiling nuclei can freely escape and be detected in coincidence with the beta. This allows reconstruction of the neutrino momentum, and the measurement of the beta-neutrino correlation, in a more direct fashion than previously possible. The beta-neutrino correlation parameter of the 0+ to 0+ pure Fermi decay of 38mK is $\tilde{a}$=0.9981+-0.0030+-0.0037, consistent with the standard model prediction a=1.

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