No abstract available

[en] We point out the possibility of the partial conservation of the seniority quantum number when most eigenstates are mixed in seniority but some remain pure. This situation occurs in nuclei for the g_9/2 and h_9/2 shells where it is at the origin of the existence of seniority isomers in the ruthenium and palladium isotopes. It also occurs for f bosons

[en] Radioactive gold(III) with radioactive palladium(II) as reference ion in a chloride medium was substoichiometrically extracted with zinc diethyldithiocarbamate in chloroform. A formula for calculation of the extraction constant of the gold(III) complex was derived, for which only the values of distribution ratios of gold and palladium between the two phases had to be measured experimentally. The extraction constant was found to be log K = 68.9 +- 0.4. (Auth.)

[en] Over the last few years there has been considerable progress in both experimental facilities and theoretical calculations of magnetic moments of low-lying, short-lived nuclear states. In particular, the competition between collective and single particle excitations in the region around 70 ≤ A ≤ 100 has been examined. Recent data on Pd isotopes are presented. Newly developed techniques are applicable to work with radioactive beams. However, experimental limitations have emerged and will be discussed especially in their relations to the determination of absolute magnetic moments as opposed to relative measurements of moments in chains of isotopes.

[en] The isotopic composition of palladium has been measured in a range of terrestrial and meteoritic material using solid-source mass spectrometry. Within the limits of experimental error the isotopic composition of palladium was found to be uniform in all terrestrial samples, except a precious metal concentrate from South Africa, in which it was isotopically fractionated by 3.8 promille per mass unit with the enrichment in the heavy isotopes. This places a limit of 1 part in 10⁴ on the accuracy to which the atomic weight of terrestrial palladium can be known. Apart from linear fractionation effects, the measured isotope abundances are in excellent agreement with the work of Shima et al. and Kelly and Wasserburg. Isotopic data from a selection of iron and stone meteorite samples did not reveal any evidence of inhomogeneous mixing of r- and s-process nuclides. If r-process material has been added to the meteorites, it must constitute less than 0,3% of the palladium present. (orig.)

[en] Results: of the first direct observation of the true ternary fission of ²³⁴Pa* nucleus are presented. The yield of the effect depending on the experimental geometry is about 10^-5/binary fission. Mass of the lightest fragment in the triplet lies mainly in the range of 20–40 a.m.u. An intimate connection between the effect and known cluster decay as well as conventional binary fission is briefly discussed.

[en] Until recently inelastic scattering did not gain the proper attention in fission-product cross section evaluations. In many existing evaluations global spherical optical models have been used, neglecting direct and preequilibrium effects. There are also few experimental data relevant to inelastic scattering in fission products. This paper is focused on the anomalously high inelastic scattering cross sections observed in even-mass nuclei near mass A = 100 at low energies. Both more data and more refined theoretical analyses are required. A number of suggestions for relevant coupled-channel calculations is made. 29 refs

[en] The hyperfine structure of the ³D₁ and ¹D₂ states of the 4d⁹ 5s configuration of ¹⁰⁵Pd have been determined by use of intermodulated fluorescence spectroscopy in an atomic beam which has been produced by a hollow cathode effusive beam source. Together with previous results by other workers a consistent description of the hyperfine structure in the 4d⁹ 5s configuration has been given. From the isotope shift data of some transitions to the 4d⁹ 5p configuration relative values for the nuclear field shift parameter λ^AA' could be obtained. (orig.)

[en] The projected shell model calculations have been carried out in the neutron-rich ^114-124Pd isotopic mass chain. The results have been obtained for the deformation systematics of $E(2_1^{+})$ and $E(4_1^{+})/E(2_1^{+})$ values, BCS subshell occupation numbers, yrast spectra, backbending phenomena, B(E2) transition probabilities and g-factors in these nuclei. The observed systematics of $E(2_1^{+})$ values and $R_{42}$ ratios in the ^114-124Pd isotopic mass chain indicate that there is a decrease of collectivity as the neutron number increases from 68 to 78. The occurrence of backbending in these nuclei as well as the changes in the calculated B(E2) transition probabilities and g -factors predict that there are changes in the structure of yrast bands in these nuclei. These changes occur at the spin where there is crossing of g-band by 2-qp bands. The predicted backbendings and predicted values of B(E2)s and g-factors in some of the isotopes need to be confirmed experimentally.

No abstract available