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Katich, J.,Qian, X.,Zhao, Y. X.,Allada, K.,Aniol, K.,Annand, J. R. M.,Averett, T.,Benmokhtar, F.,Bertozzi, W.,Bradshaw, P. C.,Bosted, P.,Camsonne, A.,Canan, M.,Cates, G. D.,Chen, C.,Chen, J.-P.,Chen, American Physical Society 2014 Physical Review Letters Vol.113 No.2
<P>We report the first measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the inclusive reaction 3)He()(e,e')X on a polarized (3)He gas target. Assuming time-reversal invariance, this asymmetry is strictly zero in the Born approximation but can be nonzero if two-photon-exchange contributions are included. The experiment, conducted at Jefferson Lab using a 5.89 GeV electron beam, covers a range of 1.7<W<2.9??GeV, 1.0<Q(2)<4.0??GeV(2) and 0.16<x<0.65. Neutron asymmetries were extracted using the effective nucleon polarization and measured proton-to-(3)He cross-section ratios. The measured neutron asymmetries are negative with an average value of (-1.090.38)10(-2) for invariant mass W>2??GeV, which is nonzero at the 2.89σ level. Our measured asymmetry agrees both in sign and magnitude with a two-photon-exchange model prediction that uses input from the Sivers transverse momentum distribution obtained from semi-inclusive deep-inelastic scattering.</P>
Applications of Photonuclear Physics for International Safeguards and Security
M. S. Johnson,J. M. Hall,D. P. McNabb,J. L. McFarland,E. B. Norman,W. Bertozzi,S. E. Korbly,R. J. Ledoux,W. H. Park 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
Studies of nuclear resonance fluorescence based applications are presented. Important for these applications are data for isotopes such as ^(239)Pu. Nuclear resonance fluorescence measurements of ^(239)Pu were performed at the free electron laser facility at UC Santa Barbara using photons from a bremsstrahlung beam with an endpoint energies between 4.0 MeV and 5.5 MeV. Though no discrete states with significant confidence level were measured, we have excluded the region above 27(3) eV-barns, or 4-sigma, where we would expect only a small chance of false positives. Details of the measurements and the results are presented here.