[en] For three diatomic molecular cations-H₂⁺, HeH⁺ and NeH⁺ and their isotopic variants, we calculated the rotational g factor, g_r, as a function of internuclear separation R with attention to characteristics at distances much smaller or larger than equilibrium separation R_e and with the correct nuclear contribution in terms of nuclear masses. We derive a general limiting formula for g_r at large internuclear separations: g_r → m_pμM_b^-2, in which μ is the molecular reduced mass and M_b is the mass of the separating cation, both in terms of atomic masses, and m_p is the protonic rest mass

[en] Collisions of ultracold Ba⁺ ions on a Rb Bose-Einstein condensate have been suggested as a possible benchmark system for ultracold ion-neutral collision experiments. However, a priori knowledge of the possible processes is desirable. For this purpose, we here present high-level four-component coupled cluster and multi-reference configuration interaction calculations of potential energy curves, dipole moments and spectroscopic constants of the experimentally interesting low-lying electronic states of the (RbBa)⁺ molecule. Our results show significant avoided crossings between the ³Σ⁺_1,0^- Rb + Ba⁺ entrance channels and low-lying charge transfer ³Π_1,0^- states of the Rb⁺ and Ba_6s¹5d¹(³D) atomic channels, indicating that a fast non-radiative charge transfer is possible. Population analysis shows that a partially covalent polar bond is formed in the ground state, which thus deviates significantly from a pure Rb⁺ + Ba interaction. This finding is corroborated by the electric dipole moment which is found only to be 4.5 D at the equilibrium bond distance, compared with the 14 D for a pure Rb⁺ + Ba interaction, thereby supporting the view of a partial charge transfer between the two atoms.

[en] High-spin states in ^163,164Lu have been populated in the ¹³⁹La(²⁹Si,xn) reaction and their decay has been studied using the EUROBALL γ-ray spectrometer array. In ¹⁶⁴Lu eight new superdeformed (SD) bands have been found. In ¹⁶³Lu the previously known SD band is extended to lower and higher spins and its decay to the normal-deformed states has been established. In addition, a new SD band is identified. Calculations with the Ultimate Cranker code predict large triaxiality (γ≅±20 deg.) for all these bands

[en] Excited states of ¹²³I were populated via the ¹¹⁶Cd(¹⁴N, α3n) reaction at 65 MeV. The resultant γ-rays were detected using standard γ-ray spectroscopic techniques with the NORDBALL detector array. Two previously known positive-parity ΔI = 2 sequences have been extended up to 31/2⁺ and 41/2⁺. In addition, a number of ΔI = 1 transitions linking the two ΔI = 2 sequences have been observed. It is suggested that both ΔI = 2 sequences are based on a common configuration. This ΔI = 1 band is proposed to be built predominantly on the g_7/2[404]7/2⁺ oblate configuration, based on the energy-level spectra, B(M1)/B(E2) ratios and the theoretical predictions from the particle-rotor model. The previously identified ΔI = 1 rotational band built on the prolate g_9/2[404]9/2⁺ orbital has also been extended to higher spins. Another previously identified but weakly populated ΔI = 1 band is confirmed and is proposed to be built on the d_5/2[413]5/2⁺ configuration with the ground state of ¹²³I as the bandhead