Beta-neutrino correlation experiments on laser trapped 38mK, 37K

A. Gorelov, J. A. Behr*, D. Melconian, M. Trinczek, P. Dubé, O. Häusser, U. Giesen, K. P. Jackson, T. Swanson, J. M. D'Auria, M. Dombsky, G. Ball, L. Buchmann, B. Jennings, J. Dilling, J. Schmid, D. Ashery, J. Deutsch, W. P. Alford, D. AsgeirssonW. Wong, B. Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Laser trapping and cooling techniques are now being applied to the study of nuclear β-decay at several labs. 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 β. This allows reconstruction of the neutrino momentum, and the deduction of the β-ν correlation in a more direct fashion than previously possible. In addition, the nuclei can be polarized by atomic techniques, opening a new class of spin-correlation measurements to test the degree to which parity is maximally violated in the weak interaction. Our present experiment has detected several hundred thousand recoil-β+ coincidences from the 0+ → 0+ pure Fermi decay of 38mK, produced at the on-line isotope separators TISOL and ISAC at TRIUMF. Our goal is to set constraints on non-Standard Model scalar bosons competitive with high-energy colliders and more conventional β-ν correlation experiments.

Original languageEnglish
Pages (from-to)373-380
Number of pages8
JournalHyperfine Interactions
Issue number1-4
StatePublished - 2000


  • Beta decay
  • Charge state
  • Neutral atom trap
  • Shakeoff electron


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