Document Type


Publication Date


Publication Title

Journal of Physics G: Nuclear and Particle Physics






We have performed isotope shift measurements in the 2s1/2 → 2p3/2 transition of Be+ ions using advanced collinear laser spectroscopy with two counter-propagating laser beams. Measurements involving a frequency comb for laser stabilization and absolute frequency determination allowed us to determine the isotope shifts with an accuracy of 2 MHz. From the isotope shifts between 9Be and 7, 10, 11Be, high-accuracy mass shift calculations and the charge radius of the reference isotope 9Be we determined nuclear charge radii for the isotopes 7, 10Be and the one-neutron halo nucleus 11Be. The results are compared to nuclear-structure calculations using the fermionic molecular dynamics model which reproduce well the general trend of the radii. Decreasing charge radii from 7Be to 10Be are explained by the cluster structure of the nuclei. The increase from 10Be to 11Be is mainly caused by the halo neutron by which the 10Be core moves relative to the center of mass. Polarization of the 10Be core has only a small influence on the charge radius. © 2010 IOP Publishing Ltd.


This article is copyright Institute of Physics (the "Institute") and IOP Publishing 2010. References to "IOP" mean the Institute and/or IOP Publishing, as appropriate. References to "this website" are to the IOP website from which the user is linking to this Copyright Notice - Please read the following Copyright Notice carefully as your access to and use of this website will be deemed as acceptance of its terms. This Copyright Notice was last updated on 30 December 2009. The material featured on this website is subject to IOP copyright protection, unless otherwise indicated. Subject to subscriber status, reasonable amounts of IOP copyright-protected material (other than logos) may be reproduced, distributed or communicated to others free of charge in any format or media for the purposes of research for a non commercial purpose, or for private study, or for internal circulation within an organization. This is subject to the material being reproduced accurately and not being used in a misleading context. Where any IOP copyright items on this website are being reproduced, distributed or communicated to others, the source of the material must be identified and the copyright status acknowledged. In particular, where a third party wishes to include IOP copyright items on another website, they must only use non-locked-down content, link to the home-page of this website rather than reproducing the items, and fully credit this website and the copyright status of the item. Any other proposed use of IOP material will be subject to a copyright licence, available from IOP. Systematic downloading of files is prohibited. The permission to reproduce, distribute or communicate IOP-protected material does not extend to anything that is identified as being the copyright of a third party. Authorization to reproduce, distribute or communicate such material must be obtained from the copyright owner concerned. In addition, the names, images and logos identifying IOP are proprietary marks of IOP or its licensors. Other names, images and logos identifying third parties and their information, products and services are the proprietary marks of third parties. Copying or using IOP's logos and/or any third party logos accessed via this website is not permitted without the prior written approval of the relevant trade mark and/or copyright owner.

Included in

Physics Commons