Speakers
Andreas Krieger
(University of Mainz)
Christopher Geppert
(University of Mainz)
Description
Charge radii measurements of the lightest elements are benchmark tests for nuclear structure calculations. In this part of the nuclear chart, ab-initio models that treat the nuclei as consisting of individual nucleons which interact via nucleon-nucleon and three-nucleon forces are available. Moreover, the appearance of the so-called halo nuclei, having an extended nuclear matter distribution due to weakly bound nucleons, makes this region particularly interesting.
After the successful isotope shift measurements of Be-7,9,10,11 in 2008, we could now extend the measurements to the isotope Be-12 and cope with the low production rates using optical detection combined with the ion-photon coincidence technique. This isotope is interesting because Be-11 is the prototype of a one-neutron halo nucleus and also Be-14 is known to have halo character, whereas the information about the structure of Be-12 is still vague. First results of the charge radius measurement from the recent beam time at COLLAPS will be presented. Besides the isotope shift measurement of Be-12, several systematic effects were tested during the beamtime, e.g. ion beam deceleration or acceleration by the resonant laser light. High accuracy atomic structure calculations allow us to extract a preliminary nuclear charge radius from the measured optical isotope shift very accurately.
Authors
Andreas Krieger
(University of Mainz)
Christopher Geppert
(University of Mainz)
