Journal article

Publication year: 1998

Pages: 1703-1718

Journal: Physical Review C

Volume number: 57

Issue number: 4

ISSN: 0556-2813

eISSN: 1089-490X

DOI Link: https://doi.org/10.1103/PhysRevC.57.1703

Publisher: American Physical Society

Abstract: 
The pseudo SU(3) model, in an extended version in which proton and neutron degrees of freedom are incorporated explicitly, is used to study the nature of low-lying magnetic dipole excitations in even-even rare-earth nuclei. Through a linear mapping between invariants of the rotor group and SU(3), a microscopic interpretation of the "scissors" mode of the two-rotor model is realized. The model allows for, first; a classification of SU(3) shell-model configurations in terms of collective degrees of freedom and, second, an adjustment of the relative energy of distinct 1(+) states. Triaxiality of the parent proton and neutron distributions is shown to add a "twist" degree of freedom to the usual "scissors" mode picture. This new mode should be observed as: (1) a low-lying K=0 excitation, and (2) a second, doubly degenerate, K=1 transition only slightly higher in energy than the usual scissors mode. Fragmentation of the M1 strength distribution can be reproduced within framework of the model by including representation mixing terms in the Hamiltonian. [S0556-2813(98)01304-1].

Harvard Citation style: Rompf, D., Beuschel, T., Draayer, J., Scheid, W. and Hirsch, J. (1998) Towards understanding magnetic dipole excitations in deformed nuclei: Phenomenology, PHYSICAL REVIEW C, 57(4), pp. 1703-1718. https://doi.org/10.1103/PhysRevC.57.1703

APA Citation style: Rompf, D., Beuschel, T., Draayer, J., Scheid, W., & Hirsch, J. (1998). Towards understanding magnetic dipole excitations in deformed nuclei: Phenomenology. PHYSICAL REVIEW C. 57(4), 1703-1718. https://doi.org/10.1103/PhysRevC.57.1703