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$J^{\pi}$= 0$^+$ states have been investigated in the actinide nucleus${}^{240}$Pu up to an excitation energy of 3 MeV with a high-resolution (p,t)experiment at $E_{p}$= 24 MeV. To test the recently proposed $J^{\pi}$= 0$^+_2$double-octupole structure, the phenomenological approach of thespdf-interacting boson model has been chosen. In addition, the total 0$^+$strength distribution and the $0^+$ strength fragmentation have been comparedto the model predictions as well as to the previously studied (p,t) reactionsin the actinides. The results suggest that the structure of the 0$^+_2$ statesin the actinides might be more complex than the usually discussed pairingisomers. Instead, the octupole degree of freedom might contributesignificantly. The signature of two close-lying 0$^+$ states below the2-quasiparticle energy is presented as a possible manifestation of strongoctupole correlations in the structure of the 0$^+_2$ states in the actinides.

Possible experimental signature of octupole correlations in the 0$^+_2$ states of the actinides