Effective field theory for triaxially deformed odd-mass nuclei

Abstract

The effective field theory for collective rotations of triaxially deformed nuclei is generalized to odd-mass nuclei by including the angular momentum of the valence nucleon as an additional degree of freedom. The Hamiltonian is constructed up to next-to-leading order within the effective field theory formalism. The applicability of this Hamiltonian is examined by describing the wobbling bands observed in the lutetium isotopes ${}^{161,163,165,167}$Lu. It is found that by taking into account the next-to-leading order corrections, quartic in the rotor angular momentum, the wobbling energies $E_{\text{wob}}$ and spin-rotational frequency relations $\omega (I)$ are better described than with the leading order Hamiltonian.

Comments: 19 pages, 6 figures