Eur. Phys. J. A 15, 49-51 (2002)
DOI: 10.1140/epja/i2001-10225-9

Charge radius change in the heavy tin isotopes until from laser spectroscopy

F. Le Blanc¹, L. Cabaret², J.E. Crawford³, S. Essabaa¹, V. Fedoseyev⁴, W. Geithner⁵, J. Genevey⁶, M. Girod⁷, R. Horn⁵, G. Huber⁵, S. Kappertz⁵, J. Lassen⁵, J.K.P. Lee³, G. Le Scornet⁸, V. Mishin⁴, R. Neugart⁵, J. Obert¹, J. Oms¹, A. Ouchrif¹, S. Peru⁷, J. Pinard², H. Ravn⁸, B. Roussière¹, J. Sauvage¹, D. Verney¹ and the Isolde Collaboration<sup>8

1</sup>  Institut de Physique Nucléaire, IN2P3-CNRS, 91406 Orsay cedex, France
²  Laboratoire Aimé Cotton, 91405 Orsay cedex, France
³  Physics Department, Mc Gill University, H3A2T8 Montréal, Canada
⁴  Institute for Spectroscopy, Troisk, Russia
⁵  Institut für Physik der Universität Mainz, 55099 Mainz, Germany
⁶  Institut des Sciences Nucléaires, Université Joseph Fourier, 38026 Grenoble cedex, France
⁷  Service de Physique et Techniques Nucléaires, CEA, BP 12, 91680 Bruyères-le-Châtel, France
⁸  CERN, 1211 Genève 23, Switzerland

leblanc@ipno.in2p3.fr

(Received: 21 March 2002 / Published online: 31 October 2002)

Abstract
Laser spectroscopy measurements have been carried out on the very neutron-rich tin isotopes with the COMPLIS experimental setup. Using the optical transition, hyperfine spectra of Sn and Sn where recorded for the first time. The variation of the mean-square charge radius ( ) between these nuclei and nuclear moments of the isomers and the odd isotopes were thus measured. An odd-even staggering which inverts at A=130 is clearly observed. This indicates a small appearance of a plateau on the which has to be confirmed by measuring the isotope shift beyond A=132.

PACS
21.10.Ft - Charge distribution.
21.10.Ky - Electromagnetic moments.
31.30.Gs - Hyperfine interactions and isotope effects, Jahn-Teller effect.

© Società Italiana di Fisica, Springer-Verlag 2002