19-22 October 2011
Hotel Roanoke, Roanoke VA
US/Eastern timezone
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Neutron Photoproduction from 139La Using 12-15 MeV Linearly Polarized gamma-Rays

21 Oct 2011, 18:00
2h
Roanoke Foyer (Hotel Roanoke, Roanoke VA)

Roanoke Foyer

Hotel Roanoke, Roanoke VA

Speaker

R. K. Thrasher (James Madison University)

Description

Data have been collected at the High Intensity gamma-ray Source (HIgS) to investigate neutron emission from a 139La target with linearly polarized gamma rays at E_gamma = 12, 13, 14, and 15 MeV. Liquid scintillator detectors were placed at scattering angles of 55 degrees, 90 degrees and 125 degrees above, below and to the left and right of the target. Six additional detectors were placed at angles of 72 degrees, 107 degrees, and 142 degrees above and to the right of the target. The ratio of neutron yields parallel to neutron yields perpendicular to the plane of polarization observed as a function of E_n, E_gamma, and theta characterizes the response of the nucleus and may prove to be a useful observable in nuclear forensics. The results of the experiment will be discussed.

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