Nuclear spin and magnetic moment of 11Li

Isotope shift measurements in the 2s1/2→ 2p3/2transition of Be+and extraction of the nuclear charge radii for7, 10, 11Be

“…There, we explained the general trend of the charge radii from 7 Be to 10 Be by the underlying cluster nature of these nuclei: The large nuclear charge radius of 7 Be (= α + t) arises from the low cluster-threshold of only 1.586 MeV, which implies an extended wave function for the relative motion of the clusters. While 8 Be (= α + α) is unbound, the additional neutron in 9 Be glues together the two α particles with a relatively small binding energy of only 1.573 MeV, which is reflected again in a correspondingly large charge radius.…”

“…While 8 Be (= α + α) is unbound, the additional neutron in 9 Be glues together the two α particles with a relatively small binding energy of only 1.573 MeV, which is reflected again in a correspondingly large charge radius. 10 Be, on the other hand, is well bound and the nucleus is stiff against a variation in the distance of the α clusters. The additional neutron in 11 Be can either occupy a 1p 1/2 orbit (in the excited 1/2 − state at 320 keV) or an orbit in the 2s 1/2 shell for the 1/2 + ground state.…”

“…By this procedure configurations with a 10 Be core in the 2 + state and the valence neutron occupying a d-orbit are included. This admixture of core polarized configurations improves the 11 Be binding energy by about 1 MeV and is necessary to get 11 Be bound with respect to 10 Be. It leads to a slight increase of R pp from 2.10 fm in 10 Be to 2.19 fm in 11 Be.…”

“…To conclude, we have measured the isotope shifts in the 2s 1/2 → 2p 3/2 transition of Be + and extracted the nuclear charge radii for 7,10,11 Be. The radii were compared to results of our previous measurement in the 2s 1/2 → 2p 1/2 transition and good agreement was found.…”

Measurements of ground-state properties for nuclear structure studies by precision mass and laser spectroscopy

“…One limitation for the efficiency of this method is the usually small solid angle that can be covered with photo detection. In order to reach higher sensitivity, the detection of charged particles instead of photons, such as detection of β-particles from laser-oriented nuclei [34], collisional ionization [35], radioactivity detection after state-selective charge exchange [36], or collinear laser ionization [37], was applied in many cases.…”