Münster 2002 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 10: Poster Session: Nuclear Physics/Spectroscopy

HK 10.22: Poster

Tuesday, March 12, 2002, 10:30–12:45, Foyer Chemie

Hyperfinestructure, Isotope- and Isomer- shift of neutron rich Sn isotopes up to the doubly magic 132-Sn — •Jens Lassen, Roland Horn, and Gerhard Huber — Inst. für Physik, EXAKT, Johannes Gutenberg-Universität

Neutron rich isotopes are produced at CERN-ISOLDE by means of proton induced fission of 238-U. These isotopes are extraced as an ion beam and are supplied to the experiments after mass separation. For neutron rich Sn-isotopes a strong isobaric contamination, e.g. Te and Cs is present. Therefore COMPLIS, an additional element- and isotope- selective secondary, pulsed laser ion-source is used for the spectroscopy of neutron-rich Sn isotopes [1]. COMPLIS is based on inplantation of the primary ISOLDE ion beam into a grafite target, subsequent laser-desorption followed by multistep resonant laser-ionization, and time-of-flight mass-spectrometry.

Optical isotope shift and hyperfine structure are determined by scanning the first, resonant excitation laser frequency. With COMPLIS the isotope shift and hyperfine structure of the Sn isotopes and spin isomers from 125-Sn to the doubly magic 132-Sn were investigated spectroscopically [2]. First results of these measurements will be presented.

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[1] J. Sauvage et al., Hyperf. Interact. 129 (2000) 303-317

[2] B. Rouissiere et. al., IPN Orsay Report DR 01 017