Gas-like state of α clusters around a O16 core in Mg24

We have studied gas-like states of α clusters around an O16 core in Mg24 based on a microscopic α-cluster model. The 0⁺ states below the ¹⁶O+α+α threshold, which are candidates for the resonance solution judging from the energy convergence behavior, are strongly excited by an isoscalar monopole (E0) operator from the ground state, which could be observed as an experimental signature of well-developed α gas-like states in the excited states. These states have significant overlaps with the THSR (Tohsaki-Horiuchi-Schuck-Röpke) wave functions with large spatial extension.