Neutron-deuteron analyzing power data at 19.0 MeV

G. J. Weisel, W. Tornow, B. J. Crowe, A. S. Crowell, J. H. Esterline, C. R. Howell, J. H. Kelley, R. A. Macri, R. S. Pedroni, R. L. Walter, H. Witała

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Measurements of neutron-deuteron (n-d) analyzing power Ay(θ) at En=19.0 MeV are reported at 16 angles from θc.m.=46.7 to 152.0°. The objective of the experiment is to better characterize the discrepancies between n-d data and the predictions of three-nucleon calculations for neutron energies above 16.0 MeV. The experiment used a shielded neutron source, which produced polarized neutrons via the H2(d-,n-)He3 reaction, a deuterated liquid scintillator center detector (CD) and liquid-scintillator neutron side detectors. A coincidence between the CD and the side detectors isolated the elastic-scattering events. The CD pulse height spectrum associated with each side detector was sorted by using pulse-shape discrimination, time-of-flight techniques, and by removing accidental coincidences. A Monte Carlo computer simulation of the experiment accounted for effects due to finite geometry, multiple scattering, and CD edge effects. The resulting high-precision data (with absolute uncertainties ranging from 0.0022 to 0.0132) have a somewhat lower discrepancy with the predictions of three-body calculations, as compared to those found at lower energies.

Original languageEnglish (US)
Article number024003
JournalPhysical Review C - Nuclear Physics
Issue number2
StatePublished - Feb 23 2010

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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