First Measurement of the Neutron $β$-Asymmetry with Ultracold Neutrons
| dc.creator | Pattie Jr, R. W. | |
| dc.date | 2008-09-17 | |
| dc.date.accessioned | 2026-07-07T12:28:46Z | |
| dc.date.available | 2026-07-07T12:28:46Z | |
| dc.description | We report the first measurement of angular correlation parameters in neutron $β$-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 $\vecμ_n \cdot \vec{B}$ 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, $2 \times 2π$ superconducting solenoidal spectrometer. We determine a value for the $β$-asymmetry parameter $A_0$, proportional to the angular correlation between the neutron polarization and the electron momentum, of $A_0 = -0.1138 \pm 0.0051$. | |
| dc.description | 4 pages, 2 figures, 1 table, submitted to Phys. Rev. Lett | |
| dc.identifier | https://arxiv.org/abs/0809.2941 | |
| dc.identifier | http://arxiv.org/abs/0809.2941 | |
| dc.identifier | Phys.Rev.Lett.102:012301,2009 | |
| dc.identifier | doi:10.1103/PhysRevLett.102.012301 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/215647 | |
| dc.subject | Nuclear Experiment | |
| dc.title | First Measurement of the Neutron $β$-Asymmetry with Ultracold Neutrons | |
| dc.type | text |