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Positron-neutrino correlation in the O+ -> O+ decay of Ar-32

AuthorsAdelberger, E. G.; Ortiz, C.; García, A.; Swanson, H. E.; Beck, M.; Tengblad, Olof ; García Borge, María José ; Martel, Ismael; Bichsel, H.
Keywords[PACS] Angular distribution and correlation measurements
[PACS] Leptonic, semileptonic, and radiative decays
[PACS] Weak-interaction and lepton (including neutrino) aspects
[PACS] Nuclear tests of fundamental interactions and symmetries
Issue Date16-Aug-1999
PublisherAmerican Physical Society
CitationPhysical Review Letters 83(7): 1299-1302 (1999)
AbstractThe positron-neutrino correlation in the O+ -> O+ decay of Ar-32 was measured at ISOLDE by analyzing the effect of lepton recoil on the shape of the narrow proton group following the superallowed decay. Our result is consistent with the standard model prediction. For vanishing Fierz interference we find a = 0.9989 ± 0.0052 ± 0.0039, which yields improved constraints on scalar weak interactions.
Description4 pages, 1 table, 4 figures.-- PACS nrs.: 23.20.En, 13.30.Ce, 23.40.Bw, 24.80.+y.-- Erratum to this paper in: Phys. Rev. Lett. 83(15): 3101-3101 (1999).
Erratum available at: http://digital.csic.es/handle/10261/12896
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.83.1299
Appears in Collections:(CFMAC-IEM) Artículos
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