We propose to perform prompt and delayed spectroscopy of neutron deficient 211, 213-Ac (N = 122, 124) nuclei. The aim of this study is to detect and identify the low-lying excited states and possible isomeric states. The low-lying isomeric states 1 / 2+ and 13 / 2+ observed in bismuth, astatine and francium nuclei are likely to be present also in actinium nuclei. The information obtained will extend our knowledge of the evolution of the single-particle states, deformation and shape coexistence in neutron-deficient nuclei beyond lead. We propose to use the RITU gas-filled recoil separator combined with JUROGAM III gamma ray spectrometer to study the structure of 211, 213-Ac nuclei.

2024