Isotope Shifts of K X Rays and Variations of Nuclear Charge Radii
1968; American Institute of Physics; Volume: 166; Issue: 4 Linguagem: Inglês
10.1103/physrev.166.1206
ISSN1536-6065
Autores Tópico(s)Crystallography and Radiation Phenomena
ResumoThe electronic $K{\ensuremath{\alpha}}_{1}$ isotope shifts have been studied for the following sets of isotopes: ${\mathrm{Sn}}^{116\ensuremath{-}124}$, ${\mathrm{Nd}}^{144\ensuremath{-}150}$, ${\mathrm{Sm}}^{148\ensuremath{-}154}$, ${\mathrm{Gd}}^{155\ensuremath{-}156\ensuremath{-}160}$, ${\mathrm{W}}^{182\ensuremath{-}184\ensuremath{-}186}$, ${\mathrm{Hg}}^{200\ensuremath{-}204}$, and ${\mathrm{Pb}}^{206\ensuremath{-}208}$. With the help of a curved-crystal spectrometer in the Cauchois geometry the relative wavelengths of fluorescently excited x rays for two enriched isotope samples were measured to a precision of ${10}^{\ensuremath{-}7}$. The observed shifts, corrected for the normal and specific mass shifts, were compared with calculated shifts, taking into account the volume effect (adjusted for the dynamic quadrupole interaction), screening by the transition electron, and a term arising from the anomalous magnetic moment. The anomalies previously observed in the optical and muonic shifts are established with good accuracy by the present experiments.
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