S Du

Publications (3)7.37 Total impact

• Article: First measurement of the neutron beta asymmetry with ultracold neutrons.

  R W Pattie, J Anaya, H O Back, J G Boissevain, T J Bowles, L J Broussard, R Carr, D J Clark, S Currie, S Du, [......], E Tatar, W Teasdale, C Terai, B Tipton, M Utsuro, R B Vogelaar, B W Wehring, Y P Xu, A R Young, J Yuan
  [show abstract] [hide abstract]
  ABSTRACT: We report the first measurement of an angular correlation parameter in neutron beta decay using polarized ultracold neutrons (UCN). We utilize UCN with energies below about 200 neV, which we guide and store for approximately 30 s in a Cu decay volume. The interaction of the neutron magnetic dipole moment with 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 spin flipper and enter a decay volume, situated within a 1 T field in a 2x2pi solenoidal spectrometer. We determine a value for the beta-asymmetry parameter A_{0}=-0.1138+/-0.0046+/-0.0021.
  Physical Review Letters 02/2009; 102(1):012301. · 7.37 Impact Factor
• Source

  Available from: Kevin Peter Hickerson

  Article: First measurement of the neutron β asymmetry with ultracold neutrons

  Pattie, R. W, J Anaya, H. O. Back, J G Boissevain, T. J. Bowles, L. J. Broussard, R Carr, D. J. Clark, S Currie, [......], E Tatar, W Teasdale, C Terai, B. Tipton, M Utsuro, R. B. Vogelaar, B. W. Wehring, Y. P. Xu, A. R. Young, J Yuan
  [show abstract] [hide abstract]
  ABSTRACT: We report the first measurement of an angular correlation parameter in neutron β decay using polarized ultracold neutrons (UCN). We utilize UCN with energies below about 200 neV, which we guide and store for ~30 s in a Cu decay volume. The interaction of the neutron magnetic dipole moment with 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 spin flipper and enter a decay volume, situated within a 1 T field in a 2×2π solenoidal spectrometer. We determine a value for the β-asymmetry parameter A_0=-0.1138±0.0046±0.0021.
• Article: First Measurement of the Neutron beta Asymmetry with Ultracold Neutrons

  RW Pattie, J Anaya, HO Back, JG Boissevain, TJ Bowles, LJ Broussard, R Carr, DJ Clark, S Currie, S Du, [......], E Tatar, W Teasdale, C Terai, B. Tipton, M Utsuro, RB Vogelaar, BW Wehring, YP Xu, AR Young, J Yuan
  [show abstract] [hide abstract]
  ABSTRACT: We report the first measurement of an angular correlation parameter in neutron beta decay using polarized ultracold neutrons (UCN). We utilize UCN with energies below about 200 neV, which we guide and store for ~30 s in a Cu decay volume. The interaction of the neutron magnetic dipole moment with 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 spin flipper and enter a decay volume, situated within a 1 T field in a 2×2pi solenoidal spectrometer. We determine a value for the beta-asymmetry parameter A0=-0.1138±0.0046±0.0021.