[en] Ground configuration and low-lying levels of Al-like ions contribute to a variety of laboratory and solar spectra, but the available information in databases are neither complete not necessarily correct. We have performed multireference Moeller-Plesset perturbation theory calculations that approach spectroscopic accuracy in order to check the information that databases hold on the 40 lowest levels of Al-Like ions of iron group elements (K through Ge), and to provide input for the interpretation of concurrent experiments. Our results indicate problems of the database holdings on the levels of the lowest quartet levels in the lighter elements of the range studied. The results of our calculations of the decay rates of five long-lived levels (3s²3p ²p^o_3/2, 3s3p²⁴P^o J and 3s3p3d ⁴F^o_9/2) are compared with lifetime data from beam-foil, electron beam ion trap and heavy-ion storage ring experiments.

[en] The Ti XIII 2s²2p⁵3l-3l(prime) and 2s2p⁶3l-3l(prime) transitions that have been discussed previously on the basis of beam-foil spectra and laser-produced plasmas in comparison to semi-empirically scaled computations have now been treated by accurate ab initio Multi-reference Moller-Plesset calculations. While most 2s²2p⁵3l-3l(prime) line identifications are supported by the new calculations, the 2s2p⁶3l-3l(prime) transition arrays are revised. Theoretical level positions are given for all elements from Ca through Fe. The quality of the calculation is demonstrated on the beam-foil spectra of Ca

[en] Highly charged ions in the promethium sequence have been suggested to show spectral features resembling the alkali sequence ions. Guided by calculations, the 5s-5p resonance lines have been sought in a variety of experiments. In the light of the most extensive calculations of Pm-like ions yet, applying relativistic multi-reference Moeller-Plesset second-order perturbation theory, the experimental evidence is reviewed and the line identification problem assessed

[en] The hydrogen internal friction peak (HIFP) and the tensile strength, σ_f, in amorphous (denoted by 'a') Zr_60-yCu₃₀Al₁₀Si_y (y=0, 1) and a-Zr₄₀Cu_50-xAl₁₀Si_x (x=0, 1) alloys are investigated as a function of the hydrogen concentration, C_H. The drastic increase in the peak temperature, T_p, of the HIFP due to the Si addition by 1 at.% is found for the a-Zr₄₀Cu₄₉Al₁₀Si₁, where the decrease in 1/τ₀ (τ₀ denotes the pre-exponential factor of the relaxation time for the HIFP) from 1.5x10¹² s^-1 to 3.0x10¹⁰ s^-1 is observed. On the other hand, the increase in T_p due to the Si addition by 1 at.% is much smaller for a-Zr₅₉Cu₃₀Al₁₀Si₁, where 1/τ₀ for the HIFP in a-Zr₆₀Cu₃₀Al₁₀ is already as low as that for a- Zr₄₀Cu₄₉Al₁₀Si₁. For the HIFP with the peak height, Q_p^-1, beyond 1x10^-2, Q_p^-1 in the as-charged state decreases after heating to about 380 K because of the hydrogen induced structural relaxation (HISR). The HIFP with Q_p^-1 below 1x10^-2 is rather stable against the HISR. It is suggested that the highly anisotropic local strain around a hydrogen atom is responsible for the very high Q_p^-1 and the HISR. For the high-strength and high-damping performance, σ_f is higher than 1.5 GPa and Q_p^-1 after the HISR is slightly lower than 1x10^-2 for the present Zr-Cu-Al-(Si) a-alloys

[en] A recently developed relatistic multireference many-body perturbation theory based on multireference configuration-interaction wavefunctions as zeroth order wavefunctions is outlined. The perturbation theory employs a general class of configuration-interaction wve functions as reference functions, and thus is applciable to multiple open valence shell systems with near degeneracy of a manifold of strongly interacting configurations. Multireference many-body perturbation calculations are reported for the ground and excited states of chlorine-like Fe X in which the near degeneracy of a manifold of strongly interacting configurations mandates a multireference treatment. Term energies of a total of 83 excited levels arising from the 3s²3p⁵, 3s3p⁶, 3s²3p⁴3d, 3s3p⁵3d, and 3s²3p³3d² configurations of the ion are evaluated to high accuracy. Transition rates associated with E1/M1/E2/M2/E3 radiative decays and lifetimes of a number of excited levels are calculated and compared with laboratory measurements to critically evaluate recent experiments.

[en] We investigated the hydrogen internal friction peak (HIFP) in the Zr-Cu base a-alloys. From the high-strength and high-damping materials point of view, the available range for T_p is between 250 and 400 K at 300 Hz, and that for Q^-1_p is between 0.5x10^-2 and 2x10^-2 for the Zr-Cu base a-alloys with a tensile strength beyond 1.5 GPa, where T_p and Q^-1_p are the peak temperature and peak height of the HIFP, respectively. For the HIFP mechanism, almost all the hydrogen atoms contribute to the HIFP in Zr₆₀Cu₄₀ and Zr_60-yCu₃₀Al₁₀Si_y (y=0, 1) a-alloys [a-alloys(I)] and the hydrogen atoms sitting in the hydrogen sites near the chemical potential can contribute to the HIFP in Zr₅₀Cu₅₀, a-Zr₄₀Cu₆₀ and a-Zr₄₀Cu_50-xAl₁₀Si_x (x=0,1) [a-alloys(II)]. T_p is considerably higher for a-alloys(II) than for a-alloys(I). The drastic increase in T_p due to the Si addition by 1% is found for a-alloys(II) (a-Zr₄₀Cu₄₉Al₁₀Si₁). The small increase in T_p due to the Si addition by 1% is found for a-alloys(I) (Zr₅₉Cu₃₀Al₁₀Si₁) The migration path for the HIFP is discussed

[en] The summaries of the works performed at the KENS in fiscal year 1983 are collected. It is regrettable that the neutron source was completely shut down this year because of the construction of a big tunnel for TRISTAN. It is expected to restart beam experiment in next June. The KENS-1' project steadily progressed in this period. It is planned to replace the target of W with U in the next summer, and an H^- injection system and a new 40 MeV proton LINAC injector will be near completion. Thus, the neutron intensity will substantially increase in the next fall. The successful observation of the Bose-condensation in liquid He-4 with a resonance detector spectrometer RAT was the highlight. The detection of the very early stage of spinodal decomposition in Fe-Cr and Al-Zn alloys by SAN was achieved, and the TOP and LAM-80 spectrometers provided with the potentials of cold pulsed neutron sources. Two powder diffractometers, MRP and HRP, were installed in the last fiscal year. The recent layout of the KENS facility is shown. The next goal, KENS-2 project, has been discussed, and the result of the design study of a proton accelerator GEMINI is reported. The experimental results and instrumental development are summarized. (Kako, I.)

[en] Relativistic multireference many-body perturbation theory calculations have been performed on Xe⁴³⁺-Xe³⁹⁺ ions, resulting in energy levels, electric dipole transition probabilities, and level lifetimes. The second-order many-body perturbation theory calculation of energy levels included mass shifts, frequency-dependent Breit correction and Lamb shifts. The calculated transition energies and E1 transition rates are used to present synthetic spectra in the extreme ultraviolet range for some of the Xe ions

[en] Neutron scattering experiments have been performed in MnSi below T/sub c/ with the double-axis powder scattering technique using unpolarized neutrons, and also with the polarization analysis technique. The magnetic scattering intensity has not shown any anomaly around q = 0.5 A^-1, in contrast to the previous results of Ziebeck et al. who found a large intensity peak at this momentum transfer. Thus the hypothesis of Ziebeck et al. of observing an Exchange Hole is excluded

[en] The paper discusses the characteristics of neutron scattering and μSR in order to find the collaborating works with both techniques. The discussions are made on four subjects, random spin systems, itinerant electron magnetism, surface and real time spectroscopy, with some detailed discussions on the cluster spin glass 88FeTiO₃-12Fe₂O₃ and itinerant ferromagnet MnSi, for which the collaboration has yielded fruitful results. (Auth.)