title: Nuclear charge radius of 12Be.
abstract: The nuclear charge radius of (12)Be was precisely determined using the technique of collinear laser spectroscopy on the 2s(1/2)→2p(1/2,3/2) transition in the Be(+) ion. The mean square charge radius increases from (10)Be to (12)Be by δ<r(c)(2)>(10,12)=0.69(5) fm(2) compared to δ<r(c)(2)>(10,11)=0.49(5) fm(2) for the one-neutron halo isotope ^{11}Be. Calculations in the fermionic molecular dynamics approach show a strong sensitivity of the charge radius to the structure of ^{12}Be. The experimental charge radius is consistent with a breakdown of the N=8 shell closure.
authors.affiliation: Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, D-55128 Mainz, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Krieger
authors.forename: K
authors.initials: K
authors.lastname: Blaum
authors.forename: M L
authors.initials: ML
authors.lastname: Bissell
authors.forename: N
authors.initials: N
authors.lastname: Frömmgen
authors.forename: Ch
authors.initials: Ch
authors.lastname: Geppert
authors.forename: M
authors.initials: M
authors.lastname: Hammen
authors.forename: K
authors.initials: K
authors.lastname: Kreim
authors.forename: M
authors.initials: M
authors.lastname: Kowalska
authors.forename: J
authors.initials: J
authors.lastname: Krämer
authors.forename: T
authors.initials: T
authors.lastname: Neff
authors.forename: R
authors.initials: R
authors.lastname: Neugart
authors.forename: G
authors.initials: G
authors.lastname: Neyens
authors.forename: W
authors.initials: W
authors.lastname: Nörtershäuser
authors.forename: Ch
authors.initials: Ch
authors.lastname: Novotny
authors.forename: R
authors.initials: R
authors.lastname: Sánchez
authors.forename: D T
authors.initials: DT
authors.lastname: Yordanov