Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2004-01-08
Nucl.Instrum.Meth.A521:468-479,2004
Physics
Nuclear Physics
Nuclear Experiment
19 pages, 4 figures, submitted to Nucl. Instr. and Meth. A
Scientific paper
10.1016/j.nima.2003.11.192
An apparatus for measuring parity-violating asymmetries in gamma-ray emission following polarized cold neutron capture was constructed as a 1/10th scale test of the design for the forthcoming n+p->d+gamma experiment at LANSCE. The elements of the polarized neutron beam, including a polarized 3He neutron spin filter and a radio frequency neutron spin rotator, are described. Using CsI(Tl) detectors and photodiode current mode readout, measurements were made of asymmetries in gamma-ray emission following neutron capture on 35Cl, 113Cd, and 139La targets. Upper limits on the parity-allowed asymmetry $s_n \cdot (k_{\gamma} \times k_n)$ were set at the level of 7 x 10^-6 for all three targets. Parity-violating asymmetries $s_n \cdot k_{\gamma}$ were observed in 35Cl, A_gamma = (-29.1 +- 6.7) x 10^-6, and 139La, A_gamma = (-15.5 +- 7.1) x 10^-6, values consistent with previous measurements.
Blessinger C. S.
Bowman David J.
Chupp Timothy E.
Coulter K. P.
Gericke M. T. W.
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