Microscopic investigation of the low-lying magnetic dipole transitions in the odd-mass Ho155-169 isotopes

The low-lying magnetic dipole (M1) strength in deformed odd-mass Ho155-169 nuclei is investigated using rotational invariant (RI-) Quasiparticle Phonon Nuclear Model (QPNM). The gross features and fragmentation of the scissors mode in Ho-165 is well reproduced by RI-QPNM calculations. The systematics of the low-energy M1 excitation in Ho isotopic chain is discussed with respect to summed strength. Besides, the results for M1 excitations in odd-mass Ho isotopes are compared with the systematics of the scissors mode in the neighbouring even-even nuclei. The obtained results generally match the systematic and trends typical for the scissors motion. In addition to the low-lying M1 excitations, a M1 giant resonance in the 7-15 MeV energy region is predicted for Ho155-169 nuclei in the present study. (C) 2017 Elsevier B.V. All rights reserved.