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Isotope shift in the dielectronic recombination of three-electron ANd57+

C Brandau¹, C Kozhuharov, Z Harman

¹Gesellschaft für Schwerionenforschung (GSI), 64291 Darmstadt, Germany. c.brandau@gsi.de

Physical Review Letters

|March 21, 2008

Abstract:

Isotope shifts in dielectronic recombination spectra were studied for Li-like (A)Nd(57+) ions with A=142 and A=150. From the displacement of resonance positions energy shifts deltaE(142 150)(2s-2p(1/2))=40.2(3)(6) meV [(stat)(sys)] and deltaE(142 150)(2s-2p(3/2))=42.3(12)(20) meV of 2s-2p(j) transitions were deduced. An evaluation of these values within a full QED treatment yields a change in the mean-square charge radius of (142 150)deltar(2)=-1.36(1)(3) fm(2). The approach is conceptually new and combines the advantage of a simple atomic structure with high sensitivity to nuclear size.

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