https://doi.org/10.1140/epja/i2017-12404-5
Regular Article - Theoretical Physics
Effective field theory for triaxially deformed nuclei
1
Physik-Department, Technische Universität Müchen, D-85747, Garching, Germany
2
State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, 100871, Beijing, China
3
Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115, Bonn, Germany
4
Institute for Advanced Simulation, Institut für Kernphysik, Jülich Center for Hadron Physics and JARA-HPC, Forschungszentrum Jülich, D-52425, Jülich, Germany
5
School of Physics and Nuclear Energy Engineering, Beihang University, 100191, Beijing, China
6
Department of Physics, University of Stellenbosch, Stellenbosch, South Africa
* e-mail: qbchen@pku.edu.cn
Received:
13
July
2017
Accepted:
5
October
2017
Published online:
24
October
2017
Effective field theory is generalized to investigate the rotational motion of triaxially deformed even-even nuclei. The Hamiltonian for the triaxial rotor is obtained up to next-to-leading order within the effective field theory formalism. Its applicability is examined by comparing with a five-dimensional rotor-vibrator Hamiltonian for the description of the energy spectra of the ground state and band in Ru isotopes. It is found that by taking into account the next-to-leading order corrections, the ground state band in the whole spin region and the
band in the low spin region are well described. The deviations for high-spin states in the
bands point towards the importance of including vibrational degrees of freedom in the effective field theory formulation.
© SIF, Springer-Verlag GmbH Germany, 2017