Physics
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..dnp.gf001s&link_type=abstract
American Physical Society, 2002 Fall Meeting of the Division of Nuclear , abstract #GF.001
Physics
Scientific paper
In the allowed approximation, when an unpolarized nucleus beta decays, the beta particle and neutrino have an angular correlation given by 1+afracvcsθ_eν where v is the beta velocity, θ_eν is the angle between beta and neutrino momenta, and a is the beta-neutrino correlation coefficient. Measurements of a have restricted non-Standard Model scalar and tensor contributions to the weak interaction. Laser trapped radioactive atoms are an ideal source of activity for even more precise decay correlation experiments. The atoms in these traps are isotopically pure, confined to a volume of ˜1 mm^3, nearly at rest, and the decay products emerge without scattering. This allows unperturbed detection of low-energy recoil daughter nuclei, from which the momentum of the neutrino can be inferred. We produce ^21Na on-line at the 88" Cyclotron at LBNL and maintain traps with up to 800,000 atoms. Using a microchannel plate and a plastic scintillator beta detector telescope, we detect daughter ^21Ne ions and positrons from the decay in coincidence and determine a from the time of flight spectrum of the recoil ions in the presence of a drift electric field. We have collected over 600,000 coincident events which provides a statistical precision of 0.7%. The total systematic uncertainty is ˜1%. This work is supported by the U.S. Department of Energy under Contract No. DE-AC03-76SF00098.
Freedman Stuart
Fujikawa Brian
Scielzo Nicholas
Vetter Paul
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