Beta asymmetry parameter in the decay of 114In

Details Beta asymmetry parameter in the decay of 114In Beta asymmetry parameter in the decay of 114In

2008-12-31

arxiv.org/abs/0901.0081v2

Phys.Rev.C80:062501,2009

Physics

Nuclear Physics

Nuclear Experiment

11 pages, 2 figures; additional information was added on systematic effects, the magnetic field map and the calculation of the

Scientific paper

10.1103/PhysRevC.80.062501

The beta asymmetry parameter A for the pure Gamow-Teller decay of 114In is reported. The low temperature nuclear orientation method was combined with a GEANT4 based simulation code allowing for the first time to address in detail the effects of scattering and of the magnetic field. The result, A = -0.994 +/- 0.010stat +/- 0.010syst, constitutes the most accurate value for the asymmetry parameter of a nuclear beta transition to date. The value is in agreement with the Standard Model prediction of A = -1 and provides new limits on tensor type charged weak currents.

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