The newly observed isomer and ground-state band in the odd-Z neutron-rich rare-earth nucleus 163 Eu are investigated by using the cranked shell model (CSM) with pairing treated by the particlenumber conserving (PNC) method. This is the first time detailed theoretical investigations are performed of the observed 964(1) keV isomer and ground-state rotational band in 163 Eu. The experimental data are reproduced very well by the theoretical results. The configuration of the 964(1) keV isomer is assigned as the three-particle state 13 2 − (ν 7 2 + [633]⊗ν 1 2 − [521]⊗π 5 2 + [413]). Morelow-lying multi-particle states are predicted in 163 Eu. Due to its significant effect on the nuclear mean field, the high-order ε 6 deformation plays an important role in the energy and configuration assignment of the multi-particle states. Compared to its neighboring even-even nuclei 162 Sm and 164 Gd, there is a 10% ∼ 15% increase of J (1) of the one-particle ground-state band in 163 Eu. This is explained by the pairing reduction due to the blocking of the nucleon on the proton π 5 2 + [413] orbital in 163 Eu. * hext@nuaa.edu.cn 1 arXiv:1906.06473v1 [nucl-th]
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