The electric dipole strength above the one-neutron separation energy has been measured in the neutron-rich nucleus 52Ca using the Coulomb excitation at 223 MeV/nucleon in inverse kinematics. The γ-ray detector array CATANA, the neutron detector NeuLAND demonstrator, and the SAMURAI spectrometer at RIKEN Nishina Center were combined to reconstruct the excitation energy of 52Ca. A observed sharp peak at the very low neutron energy in the 52Ca → 51Ca +n channel indicates that 52Ca has a sizable amount of dipole strength just above the one neutron threshold.

The authors thank the staffs of RIKEN RIBF and CNS for their efforts in providing the primary and secondary beams. The present work was supported in part by JSPS Grant-in-Aid for Scientific Research Grants No. JP21H01114, JSPS KAKENHI Grant No. 24105005.

6 pags., 3 figs.

Peer reviewed