Nuclear Charge Radius of Be-12

Krieger, A; Blaum, K; Bissell, Mark; Froemmgen, N; Geppert, Ch; Hammen, M; Kreim, K; Kowalska, M; Kraemer, J; Neff, T; Neugart, R; Neyens, Gerda; Noertershaeuser, W; Novotny, Ch; Sanchez, R; Yordanov, DT

doi:10.1103/PhysRevLett.108.142501

Nuclear Charge Radius of Be-12

Author:

Krieger, A

Blaum, K ; Bissell, Mark ; Froemmgen, N ; Geppert, Ch ; Hammen, M ; Kreim, K ; Kowalska, M ; Kraemer, J ; Neff, T ; Neugart, R ; Neyens, Gerda ; Noertershaeuser, W ; Novotny, Ch ; Sanchez, R ; Yordanov, DT

Keywords:

laser spectroscopy, charge radius, 12Be, N=8, Science & Technology, Physical Sciences, Physics, Multidisciplinary, Physics, SPECTROSCOPY, SCATTERING, LIFETIME, STATE, BEAMS, physics.atom-ph, nucl-th, 01 Mathematical Sciences, 02 Physical Sciences, 09 Engineering, General Physics, 40 Engineering, 49 Mathematical sciences, 51 Physical sciences

Abstract:

The nuclear charge radius of Be-12 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 Be-10 to Be-12 by delta < r(c)(2)>(10,12) = 0.69(5) fm(2) compared to delta < r(c)(2)>(10,11) = 0.49(5) fm(2) for the one-neutron halo isotope Be-11. Calculations in the fermionic molecular dynamics approach show a strong sensitivity of the charge radius to the structure of Be-12. The experimental charge radius is consistent with a breakdown of the N = 8 shell closure.