Study of exotic deformed high-spin states in nuclei

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In this project, the exotic deformation and its associated collective rotational excitations have been studied up to the high-spin states. As for the exotic deformation we focused on the tetrahedral deformation, which has one of the higher point-group symmetries and is very different from the usual quadrupole deformation (elliptic shape). It was predicted that a very characteristic quantum mechanical spectrum appears for the tetrahedrally-symmetric deformed nucleus. We have, for the first time, succeeded to show that such a characteristic spectrum indeed emerges in tetrahedrally-deformed nuclei by employing fully microscopic quantum-number-projection calculation, i.e., by angular momentum, number, and parity projections at the same time. Although the tetrahedrally-deformed nuclear states have not yet confirmed experimentally, it can be expected that the present result gives an important clue for the future study of this interesting exotic deformation.