Photoexcitation of the isomers of 19 nuclides was examined in this work. Four accelerators were used as sources of bremsstrahlung to expose the samples and end-point energies covered the range from 0.5 to 11 MeV. No evidence was found for nonresonant processes of excitation. However, more than half the cases showed enhanced channels for the resonant photoexcitation of isomers with integrated cross sections approaching 10 ' cm keV. These results are three to four orders of magnitude larger than values usually characterizing {y, y') reactions.

No abstract

No abstract

A method of multichannel analysis of ions blown off laser-produced plasma is described. The ions are analyzed in a time-of-flight tube followed by a dynamic, capacitorlike, analyzer. This combination enables one to determine simultaneously the relative yield and energy distribution of all the ions created in one laser shot. Design considerations are presented together with some typical experimental results. The spectrometer is currently being used for the diagnostics of laser-produced plasmas.

No abstract