Hyperfine anomaly in Be isotopes in the cluster model and the neutron spatial distribution

Abstract

The study of the hyperfine (hfs) anomaly in neutron rich nuclei can give a very specific and unique way to study the neutron distribution and the clustering structure. We study the sensitivity of the hfs anomaly to the clustering effects in the 9 Be isotope using two different nuclear wave functions obtained in the three-cluster (α + α + n) model. The results are compared to those obtained for 9,11 Be in a two-body core + neutron model to examine whether the hfs anomaly is sensitive to a halo structure in 11 Be.

‘‘Tomography’’ of the Cluster Structure of Light Nuclei via Relativistic Dissociation

“…The shares of the events Θ n and Θ w constitute 0.56±0.04 and 0.44±0.04, respectively. These values demonstrate the compliance with the weights of the 8 Be 0 + and 2 + states adopted in [48,49] and point to the presence of these states as components of the 9 Be ground state.…”

“…In the two-body model used for the calculation of the magnetic moment [48,49] of the 9 Be nucleus, the latter is represented as a bound state of the neutron and 8 Be core in the 0 + For events Θ vw an important factor is the accuracy of the determination of energy and of identification of He isotopes. Thus, the formation of Θ n pairs is matched to decays of the 8 Be 0 + ground state and Θ w pairs − of the first excited 2 + state.…”

Coherent dissociation of relativistic 9C nuclei

“…In our investigation of the 2α + n structure of the 9 Be nucleus [7], it was found that the 9 Be → 2α fragmentation process proceeds with close probabilities through the 0 + and 2 + states of the 8 Be nucleus. These probabilities show correspondence with the weights assigned to the 0 + and 2 + states of the 8 Be nucleus in calculating the magnetic moment of the 9 Be nucleus on the basis of cluster wave functions [14,15]. Data on the relativistic fragmentation of 9 Be nuclei [7] can be considered as the proof that, with a high probability,…”

Developments at the SLOWRI facility at RIKEN: precision optical spectroscopy of 7,9,10,11Be+ ions

“…The goal of these hyperfine structure measurements is to determine the magnetization radius through the Bohr-Weisskopf effect [17][18][19][20]. For this purpose, we need to know the nuclear magnetic moments (or g-factors) with high accuracies which should independently be determined from the hyperfine constants.…”