High-spin states in 139 Pm are investigated via the 116 Cd( 27 Al, 4n) 139 Pm fusion-evaporation reaction at a beam energy of 120 MeV. The previously reported level scheme has been modified because of identifications of some linking and doublet transitions. The revised yrast πh 11/2 band obviously undergoes πh 11/2 → π (h 11/2 ) 3 → π (h 11/2 ) 3 ⊗ν(h 11/2 ) −2 band crossings athω = 0.45 and 0.39 MeV. Two negative-parity dipole bands have been assigned as πh 11/2 ⊗ν(h 11/2 ) −2 and πh 11/2 ⊗ν(h 11/2 ) −4 configurations, respectively, and can be considered as examples of magnetic rotational bands.

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Ground-state energy functions of even-even and odd-A nuclei are derived from simple parameter-dependent Interacting Boson Model (IBM) and Interacting Boson-Fermion Model (IBFM) Hamiltonians. Exact nuclear shape-phase diagrams in the two-parameter (η, χ) plane are explicitly described using the energy functions on the basis of the condition of phase equilibrium.