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HK: Physik der Hadronen und Kerne

HK 31: Nuclear Physics / Spectroscopy V

HK 31.1: Gruppenbericht

Mittwoch, 13. März 2002, 14:00–14:30, C

Nuclear radii and moments of short-lived isotopes in the range ¹⁷⁻²⁸Ne — •W. Geithner¹, S. Kappertz¹, M. Keim¹, R. Neugart¹, S. Wilbert¹, P. Lievens², K. Marinova³, K.-M. Hilligsoe⁴, H. Simon⁵, S. Franchoo⁶, L. Weissman⁶, and ISOLDE Collaboration⁶ — ¹Inst. für Physik, Univ. Mainz — ²K.U. Leuven — ³Univ. Sofia — ⁴Univ. Aarhus — ⁵TU Darmstadt — ⁶CERN, Geneva

Laser spectroscopy experiments at the ISOLDE mass separator on neon isotopes from ¹⁷Ne at the proton drip line to the neutron-rich ²⁸Ne have revealed interesting aspects of nuclear structure in the lower sd-shell region. These include the question of a proton halo structure of ¹⁷Ne and the mirror properties in comparison with ¹⁷N, the N=8 neutron shell closure as well as the development of single-particle and deformation properties with the number of neutrons in the sd shell. The changes of nuclear mean square charge radii, and the magnetic moments and quadrupole moments are obtained from the measurement of isotope shifts and hyperfine structure of optical spectral lines. For experiments on light elements the required accuracy and sensitivity of collinear laser spectroscopy was achieved by improving the determination of Doppler shifts and by employing a β-activity detection in combination with state-selective collisional ionization. Recently, these improvements were also exploited to complement earlier data on argon isotopes and to investigate ⁷³Kr for which a remarkably large inverted odd-even staggering was observed. (Supported by BMBF and EU.)