Electromagnetic properties of A hypernuclei with a beyond relativistic mean-field approach

We present a microscopic study of electromagnetic properties of the low-lying states of single-A hypernucleus 9ABe using a quantum-number projected generator coordinate method (HyperGCM) based on covariant density functional theory. All the configurations are restricted to have axial symmetry, with the A hyperon in the lowest-energy state. The results are compared to the predictions of a simple particle-rotor model (PRM), for which analytic expressions are available. We show that the electromagnetic properties of 9ABe from the HyperGCM calculation are close to those by the PRM. In particular, it is found that the magnetic moments and M 1 transition strengths are less sensitive to the coupling strengths of the AN interaction than the electric quadrupole transition strengths. The latter may provide additional constraints on the AN interaction.