Influence of lead and zinc oxides on the radiation shielding properties of tellurite glass systems

The radiation shielding properties of xPbO-(100-x)TeO2, x = 10, 20, and 30 mol% binary glasses and y[ZnO]-(100-y)[70(TeO2)-30(PbO)] y = 15, 20, and 25 mol% ternary glasses were investigated using Geant4 simulations and the newly developed Phy-X/PSD program. The glasses’ gamma shielding abilities were assessed using their mass attenuation coefficient (μ/ρ), mean free path (MFP), effective atomic number (Zeff), and half value layer (HVL) values. The neutron shielding ability was evaluated by determining the removal cross-section (RCS) values, which were 0.097, 0.101, and 0.103 cm-1 for binary PbO-TeO2 (PT) glasses and 0.118, 0.116, and 0.114 cm-1 for ternary ZnO-PbO-TeO2 (PTZ) glasses. The gamma and neutron shielding features of the glasses were compared with those of various ordinary concretes and Pb-free, Pb-based, and commercial glasses. The addition of PbO changed the gamma and neutron properties of the PT glasses, while the addition of ZnO demonstrated a different trend in the gamma properties of the PTZ glass system

A measurement of parity-violating asymmetry with polarized electrons scattered from protons and implications for strange form factors

We have measured the parity violating asymmetry with polarized electrons scattered elastically from protons. The result is A = -15.05 ± 0.98( stat ) ± 0.56( syst ) ppm at the kinematic point [left angle bracket][straight theta] lab [right angle bracket] = 12.3° and [left angle bracket] Q 2 [right angle bracket] = 0.477( GeV/c ) 2 . The value for the linear combination of the strange form factors found using A is [Special characters omitted.] + 0.392[Special characters omitted.] = 0.025 ± 0.020 ± 0.014 where the first error is experimental and the second stems from the uncertainties in the electromagnetic form factors