[en] High-spin states in ¹⁶⁶Yb have been studied via the ¹⁵⁴Sm (¹⁶O,4n)¹⁶⁶Yb reaction with 80 Mev ¹⁶O ions from the NBI tandem accelerator. γ-γ coincidence data were accumulated with an array of four Ge(Li) and four NaI(Tl) detectors to favour high multiplicity events. Totally about 3 x 10⁸ events were accumulated in the coincidence experiment. Measurements of the angular distribution of the γ-radiation and the conversion coefficients were furthermore performed. Four weakly populated side bands are observed besides the yrast cascade which is followed up to its 24⁺ member. The ground state band has thus been identified to its 18⁺ state, while the crossing Stockholm band becomes the yrast band from its 16⁺ member. The S-band is established from its 12⁺ state. The observed level energies and transition rates are well reproduced in calculations within the particle rotor model. (author)

[en] Information about rotational bands of deformed Yb nuclei as obtained through in-beam spectroscopic studies is discussed. Routhians and alignments have been extracted from the experimental data. Experimental single-quasineutron routhians have been used to construct two- and three-quasineutron routhians. Residual interaction between excited quasiparticles is obtained from a comparison of the excitation energies of multiple-quasiparticle states constructed from single-quasiparticle states. An odd-even neutron-number dependence of the alignment frequency of the first pair of isub(13/2) quasineutron in rare-earth nuclei is presented. This effect is explained by a reduction of the neutron pairing-correlation parameter for odd-N systems as compared to seniority-zero configurations in even-N nuclei. The signature dependence of the interband-intraband branching ratios as well as of the interband M1/E2 mixing ratios is discussed and compared to the signature dependence of B(M1) transition rates recently suggested by Hamamoto. (author)

[en] The magnitudes and signs of the hyperfine fields in the ordered ferromagnetic Heusler Alloys X₂MnZ and XMnZ (where X is Cu, Ni, Pd while Z is In, Sn and Sb) have been investigated at liquid nitrogen and room temperatures using TDPAC method. Their signs have been found to be negative. The results have been compared with the predictions of Caroll-Blandin and Cambell-Blandin models and RKKY theory. (Auth)

No abstract available

[en] The magnitudes and signs of the hyperfine magnetic field on ¹¹¹Cd nuclei at Z sites in the ordered ferromagnetic Heusler alloys X₂MnZ and XMnZ (where X is Cu, Ni, Pd while Z is In, Sn and Sb) have been investigated at liquid nitrogen and room temperatures using TDPAC method. Their signs have been found to be negative. The results have been compared with the predictions of Caroli-Blandin and Campbell-Blandin models and RKKY theory. (author)

No abstract available

[en] Published in summary form only

No abstract available

[en] The reaction (α, 2n) on the ⁸⁹Y target was used to populate excited states in ⁹¹Nb. The gamma-ray transitions belonging to this nucleus were identified by studying excitation functins and gamma-gamma coincidences. Angular distributions, life-time measurements and coincidences with charged particles were also performed. The shell model analysis is used to interpret the observed levels. Nearly all levels belonging to the (gsub(9/2))³ and Psub(1/2)(gsub(9/2)² proton configurations were found. Matrix elements of the effective proton-proton interactions were determined from the positions of the negative-parity states. These were used to calculate the energy differences of the positive parity states. Satisfactory agreement between the theoretical and experimental values was obtained. (author)

No abstract available