Positron-neutrino correlation in the 0^+ \to 0^+ decay of ^{32}Ar

Details Positron-neutrino correlation in the 0^+ \to 0^+ decay of ^{32}Ar Positron-neutrino correlation in the 0^+ \to 0^+ decay of ^{32}Ar

1999-03-05

arxiv.org/abs/nucl-ex/9903002v1

Phys.Rev.Lett. 83 (1999) 1299-1302; Erratum-ibid. 83 (1999) 3101

Physics

Nuclear Physics

Nuclear Experiment

Scientific paper

10.1103/PhysRevLett.83.1299

The positron-neutrino correlation in the $0^+ \to 0^+ \beta$ decay of $^{32}$Ar 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 $a=0.9989 \pm 0.0052 \pm 0.0036$, which yields improved constraints on scalar weak interactions.

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