Scalar interaction limits from the β-ν 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. Dubé, J. Fingler, U. Giesen, F. Glück, S. Gu, O. Häusser, K. P. Jackson, B. K. Jennings, M. R. PearsonT. J. Stocki, T. B. Swanson, M. Trinczek

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We have set limits on contributions of scalar interactions to nuclear β decay. A magneto-optical trap 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 β. This allows reconstruction of the neutrino momentum, and the measurement of the β-ν correlation, in a more direct fashion than previously possible. The β-ν correlation parameter of the 0+ → 0+ pure Fermi decay of 38Km is ã= 0.9981 ± 0.0030 -0.0037+0.0032, consistent with the standard model prediction ã = 1.

Original languageEnglish
Article number142501
JournalPhysical Review Letters
Issue number14
StatePublished - 15 Apr 2005


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