The ORELA experiment on the neutron charge radius has been reevaluated. The neutron transmission of liquid thorogenic 208 Pb with the neutron time-of-flight method in the neutron energy range from 0.08 to 800 eV was measured. Additional studies on condensed matter effects for liquid Bi and liquid Pb have provided more accurate corrections resulting in smaller systematic uncertainties for the neutron-electron scattering length b ne. We have also reevaluated the transmission data on liquid Bi of Melkonian and co-workers. We have obtained values of b ne ϭ(Ϫ1.33Ϯ0.027Ϯ0.03)ϫ10 Ϫ3 fm for 208 Pb and b ne ϭ(Ϫ1.44Ϯ0.033Ϯ0.06)ϫ10 Ϫ3 fm for 209 Bi where for both results the two uncertainties denote the statistical and the systematic uncertainty, respectively. The results for 208 Pb and 209 Bi were found to be in good agreement. ͓S0556-2813͑97͒02610-1͔
Resonant neutron absorption spectroscopy has been used to determine the temperature dependence of the average kinetic energy <£) of the Cu in Bi2Sr2CaCu2C>8 for the directions along and perpendicular to the c axis. (E) is directly related to the Cu phonon density of states and shows essentially normal behavior as a function of temperature for the c-axis direction. However, a sudden drop in (E) is observed at the superconducting transition for the motions in the Cu-O planes.
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