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[en] Abstract only

[en] Transition energies, incremental alignments of angular momentum, dynamic moments of inertia of triaxial superdeformed bands in rare-earth nuclei have been examined systematically. It is found that the incremental alignments are nearly constant and their dynamic moments of inertia are quite similar. Therefore these triaxial superdeformed bands in rear-earth nuclei are identical bands

[en] We demonstrate a technique for frequency measurements of UV transitions with sub-MHz precision. The frequency is measured using a ring-cavity resonator whose length is calibrated against a reference laser locked to the D₂ line of ⁸⁷Rb. We have used this to measure the 398.8 nm ¹S₀ ↔ ¹P₁ line of atomic Yb. We report isotope shifts of all the seven stable isotopes, including the rarest isotope ¹⁶⁸Yb. We have been able to resolve the overlapping ¹⁷³Yb (F = 3/2) and ¹⁷²Yb transitions for the first time. We also obtain high-precision measurements of the excited-state hyperfine structure in the odd isotopes, ¹⁷¹Yb and ¹⁷³Yb. The measurements resolve several discrepancies among earlier measurements. (authors)

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[en] The ⁶⁴Ni(⁴He, ⁸He)⁶⁰Ni reaction was used at 58-MeV bombarding energy with the quadrupole-dipole-dipole-dipole magnet spectrograph, giving an improved value of the ⁸He mass excess of 31.611 +- 0.017 MeV

[en] The phenomenon of identical bands is studied by analyzing the distributions of fractional changes in the dynamical moments of inertia of pairs of bands in superdeformed (SD) nuclei. These distributions are found to exhibit a peak with a centroid at nearly zero. Their widths increase in going from the SD bands in the mass A ∼ 150, to the SD bands in the mass ∼190 and to the normally-deformed bands in the rare-earth region. These differences may be attributed to the weaker pairing correlations and the stabilizing role of intruder orbitals on the structures of SD bands. Precise level lifetimes have been measured for various pairs of identical SD bands in Gd and Dy isotopes. By comparing the derived quadrupole moments with calculations performed in the framework of the cranking Skyrme-Hartree-Fock model, it is shown that, independently of the intrinsic configuration and of the proton and neutron numbers, the charge moments calculated with respect to the doubly-magic SD core of ¹⁵²Dy can be expressed in terms of independent contributions from the individual hole and particle orbitals. (author)