Effective field theory for triaxially deformed nuclei

Abstract

Effective field theory (EFT) is generalized to investigate the rotational motion of triaxially deformed even-even nuclei. A Hamiltonian, called the triaxial rotor model (TRM), is obtained up to next-to-leading order (NLO) within the EFT formalism. Its applicability is examined by comparing with a five-dimensional collective Hamiltonian (5DCH) for the description of the energy spectra of the ground state and $\gamma$ band in Ru isotopes. It is found that by taking into account the NLO corrections, the ground state band in the whole spin region and the $\gamma$ band in the low spin region are well described. The results presented here indicate that it should be possible to further generalize the EFT to triaxial nuclei with odd mass number.

arXiv comment21 pages, 9 figures

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• Microscopic description of triaxiality in Ru isotopes with covariant energy density functional theory
• Effective field theory for deformed odd-mass nuclei
• Effective field theory of pairing rotations
• Effective field theory for collective rotations and vibrations of triaxially deformed nuclei
• Effective field theories for collective excitations of atomic nuclei