Evaluation de l'effet specifique de masse dans le spectre d'arc du plutonium

Abstract

Isotope shifts between the 238, 239, 240, 241 and 242 isotopes of the plutonium arc spectrum were measured by means of the Fabry-Perot photoelectronic spectrometer (Hypeac). From the measurements, the mass specific shifts of the 16 analysed transitions, were evaluated and the coefficients of the "odd-even staggering" γ239 and γ241 were determined. The nuclear radii deduced from the α emission of the even isotopes enable us to give a prediction of the isotope shifts 236-238, not measured until now.