First Measurement of the Neutron $β$-Asymmetry with Ultracold Neutrons

Details First Measurement of the Neutron $β$-Asymmetry with Ultracold Neutrons First Measurement of the Neutron $β$-Asymmetry with Ultracold Neutrons

2008-09-17

arxiv.org/abs/0809.2941v1

Phys.Rev.Lett.102:012301,2009

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 2 figures, 1 table, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.102.012301

We report the first measurement of angular correlation parameters in neutron $\beta$-decay using polarized ultracold neutrons (UCN). We utilize UCN with energies below about 200 neV, which we guide and store for $\sim 30$ s in a Cu decay volume. The $\vec{\mu}_n \cdot \vec{B}$ potential of a static 7 T field external to the decay volume provides a 420 neV potential energy barrier to the spin state parallel to the field, polarizing the UCN before they pass through an adiabatic fast passage (AFP) spin-flipper and enter a decay volume, situated within a 1 T, $2 \times 2\pi$ superconducting solenoidal spectrometer. We determine a value for the $\beta$-asymmetry parameter $A_0$, proportional to the angular correlation between the neutron polarization and the electron momentum, of $A_0 = -0.1138 \pm 0.0051$.

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