New test of time-reversal invariance in Ne19 beta decay

F. P. Calaprice, E. D. Commins, D. C. Girvin

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A new experimental upper limit on the "time-reversal" coefficient D is reported for the allowed beta decay Ne19F19+e++e. The result, expressed in terms of the relative phase angle between axial-vector (A) and vector (V) couplings, is A,V(Ne19)=180.20.4, consistent with T invariance. A nuclear-spin-polarized atomic beam of Ne19 in which either of the magnetic substates mI=12 can be selected, is allowed to terminate its flight in a cell, where the Ne19 atoms remain for approximately four seconds without substantial spin depolarization. Delayed coincidences between positrons and F19-recoil ions from decays in the cell are observed and correlated with nuclear spin to determine D. The Ne19 nuclear polarization is monitored continuously by observation of the beta-decay asymmetry.

Original languageEnglish (US)
Pages (from-to)519-529
Number of pages11
JournalPhysical Review D
Issue number3
StatePublished - 1974

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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