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

A. Gorelov; D. Melconian; W. P. Alford; D. Ashery; G. Ball; J. A. Behr; P. G. Bricault; J. M. D'Auria; J. Deutsch; J. Dilling; M. Dombsky; P. Dube'; J. Fingler; U. Giesen; F. Glück; S. Gu; O. Häusser; K. P. Jackson; B. K. Jennings; M. R. Pearson; T. J. Stocki; T. B. Swanson; M. Trinczek

doi:10.1103/physrevlett.94.142501

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

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Abstract

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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A. Gorelov, D. Melconian, W. P. Alford, D. Ashery, G. Ball, J. A. Behr, P. G. Bricault, J. M. D'Auria, J. Deutsch, J. Dilling, M. Dombsky, P. Dube', J. Fingler, U. Giesen, F. Glück, S. Gu, O. Häusser, K. P. Jackson, B. K. Jennings, M. R. Pearson, T. J. Stocki, T. B. Swanson, M. Trinczek. 2005-04-14. Scalar interaction limits from the beta-neutrino correlation of trapped radioactive atoms. https://doi.org/10.1103/physrevlett.94.142501

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