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New test of time-reversal invariance in Ne 19 beta decay

New test of time-reversal invariance in Ne 19 beta decay A new experimental upper limit on the "time-reversal" coefficient D is reported for the allowed beta decay Ne 19 → F 19 + e + + ν e . The result, expressed in terms of the relative phase angle between axial-vector ( A ) and vector ( V ) couplings, is φ A , V ( Ne 19 ) = 180.2 ± 0.4 ∘ , consistent with T invariance. A nuclear-spin-polarized atomic beam of Ne 19 in which either of the magnetic substates m I = ± 1 2 can be selected, is allowed to terminate its flight in a cell, where the Ne 19 atoms remain for approximately four seconds without substantial spin depolarization. Delayed coincidences between positrons and F 19 -recoil ions from decays in the cell are observed and correlated with nuclear spin to determine D . The Ne 19 nuclear polarization is monitored continuously by observation of the beta-decay asymmetry. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

New test of time-reversal invariance in Ne 19 beta decay

Physical Review D , Volume 9 (3) – Feb 1, 1974
11 pages

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Publisher
American Physical Society (APS)
Copyright
Copyright © 1974 The American Physical Society
ISSN
1089-4918
DOI
10.1103/PhysRevD.9.519
Publisher site
See Article on Publisher Site

Abstract

A new experimental upper limit on the "time-reversal" coefficient D is reported for the allowed beta decay Ne 19 → F 19 + e + + ν e . The result, expressed in terms of the relative phase angle between axial-vector ( A ) and vector ( V ) couplings, is φ A , V ( Ne 19 ) = 180.2 ± 0.4 ∘ , consistent with T invariance. A nuclear-spin-polarized atomic beam of Ne 19 in which either of the magnetic substates m I = ± 1 2 can be selected, is allowed to terminate its flight in a cell, where the Ne 19 atoms remain for approximately four seconds without substantial spin depolarization. Delayed coincidences between positrons and F 19 -recoil ions from decays in the cell are observed and correlated with nuclear spin to determine D . The Ne 19 nuclear polarization is monitored continuously by observation of the beta-decay asymmetry.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Feb 1, 1974

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