On the observation of a very low atomic displacement threshold energy in cooper

An annealing study has been made on pure and doped copper specimens irradiated with electrons of 0.3 MeV and 0.375 MeV. No recovery has been observed within the measuring sensitivity in the stage-I region. The damage produced in this experiment and that in a HVEM study by Yoshida and Urban is attributed to a subthreshold mechanism.     

Light-Induced Instabilities in Photo-Oriented Liquid Crystal Cells

In a planar liquid crystal sample sandwiched between a photosensitive and a reference plate instabilities occurred, when the cell was illuminated from the reference side. The instabilities were induced both by polarized white light source and monochromatic laser beams. Static and dynamic regimes were found; for laser irradiation dynamic instability was found only in a range of polarization directions. A model, developed for monochromatic excitation, predicts that at certain thicknesses dynamic instability is forbidden. Experiments on a wedge-like cell confirmed this conclusion.     

Quadrupole interaction of120Sb in metallic tin

The pulsed beam perturbed angular distribution method has been used to investigate the temperature dependence of the electric quadrupole interaction of¹²⁰Sb in metallic tin. The observed quadrupole coupling constant follows theT ^3/2-power law dependence. The temperature dependence of the alignment is related to the dynamics of radiation damage point defects.