Abstract:
The first measurement of the [Formula Presented] analyzing power near threshold has been performed using the High-Intensity Gamma-ray Source (HIGS) at the Duke Free-Electron Laser Laboratory. A 3.58 MeV [Formula Presented]-ray beam having an energy resolution of [Formula Presented] and [Formula Presented] linear polarization was incident on an active [Formula Presented] target. Outgoing neutrons were detected parallel and perpendicular to the plane of [Formula Presented]-ray polarization at a lab angle of 150°. The experimentally determined analyzing power provides a sensitive measurement of the relative [Formula Presented] and [Formula Presented] contributions to the total cross section. © 2000 The American Physical Society.
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