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A: Atomphysik

A 17: Posters Friday (Spectroscopy)

A 17.2: Poster

Freitag, 6. April 2001, 12:30–15:00, AT3

Accurate Isotope Shift Measurements of Short-Lived Neon Isotopes — •W. Geithner¹, R. Neugart¹, S. Kappertz¹, S. Wilbert¹, M. Keim¹, P. Lievens², L. Vermeeren², H. Simon³, K. Marinova⁴, K.M. Hilligsoe⁵, and The ISOLDE Collaboration⁶ — ¹Inst. f. Physik, Univ. Mainz — ²KU Leuven — ³GSI Darmstadt — ⁴Univ. Sofia — ⁵Univ. Aarhus — ⁶CERN Geneva

We report collinear laser spectroscopy measurements on short-lived neon isotopes performed at the on-line mass separator ISOLDE at CERN. To cope with the low count rates of very short-lived isotopes produced by nuclear reactions, we implemented a highly sensitive detection technique, which is based on state selective collisional ionization and detection of radioactivity. To meet the requirements for the accuracy, we developed a new method of calibrating the beam energy at resonance by simultaneous excitation of two atomic levels in a collinear / anticollinear geometry. The aim of the experiment is the determination of nuclear charge radii and moments. We report preliminary results for the isotope shifts of ¹⁷⁻²⁸Ne and hyperfine structure parameters of the odd isotopes.
(Supported by BMBF and EU.)