Title of article :
A measurement of parity-violating gamma-ray asymmetries in polarized cold neutron capture on 35Cl, 113Cd, and 139La
Author/Authors :
Mitchell، نويسنده , , G.S and Blessinger، نويسنده , , C.S and Bowman، نويسنده , , J.D. and Chupp، نويسنده , , T.E. and Coulter، نويسنده , , K.P and Gericke، نويسنده , , M and Jones، نويسنده , , G.L and Leuschner، نويسنده , , M.B and Nann، نويسنده , , H and Page، نويسنده , , S.A and Penttilن، نويسنده , , S.I and Smith، نويسنده , , T.B and Snow، نويسنده , , W.M. and Wilburn، نويسنده , , W.S، نويسنده ,
Abstract :
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+γ 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 sn·(kγ×kn) were set at the level of 7×10−6 for all three targets. Parity-violating asymmetries sn·kγ were observed in 35Cl, Aγ=(−29.1±6.7)×10−6, and 139La, Aγ=(−15.5±7.1)×10−6, values consistent with previous measurements.
