Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 25: Poster: Electron scattering and recombination

A 25.1: Poster

Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais

Hyperfine-induced modifications to the Kα₁ angular distribution following the radiative electron capture into hydrogen-like ions — •Zhongwen Wu¹, Andrey Surzhykov¹, and Stephan Fritzsche^1,2 — ¹Helmholtz-Institut Jena, D-07743 Jena, Germany — ²Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, D-07743 Jena, Germany

The angular distribution of the Kα₁ (1s2p_3/2 ^1,3P_1,2 → 1s^2 1S₀) radiation following the radiative electron capture into initially hydrogen-like ions with nonzero nuclear spin has been studied within the density matrix theory and the multiconfiguration Dirac-Fock method. Emphasis is placed especially upon the hyperfine interaction and how this interaction of the magnetic moment of the nucleus with those of the electrons affects the angular properties of the Kα₁ emission for isotopes with non-zero nuclear spin I≠0. As an example, calculations were performed for selected isotopes of helium-like Sn⁴⁸⁺, Xe⁵²⁺ and Tl⁷⁹⁺ ions. A quite sizeable contribution of the hyperfine interaction upon the Kα₁ angular emission is found for isotopes with nuclear spin I=1/2, while its effect is suppressed for (most) isotopes with larger nuclear spin I>1/2. We therefore expect that accurate measurements of the Kα₁ angular distributions at ion storage rings can be utilized as a tool for determining the nuclear parameters of rare stable and radioactive isotopes with I ≥ 1/2.