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Article
The sorption of inorganic ions on ion exchange resins and on chromatographic paper from organic solvent-acid mixtures
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Article
A new species ofSporothrix from calf skin
An isolate from calf skin lesions is described as the new speciesSporothrix catenata de Hoog et Constantinescu. The fungus produces conidia in relatively long chains, and may show late-stage budding.
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Article
On the stability of the nuclei of element 108 withA=263–265
In bombarding209Bi and207, 208Pb targets by55Mn and58Fe ions the yields of “cold fusion” reactions have been determined using a sensitive technique for detectingT 1/2≧1 ms spontaneous fission and theα-decay of he...
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Article
ESR study of the radiolysis of polycrystalline benzene-2,1-diazoquinone-4-sulphonic acid
Electron spin resonance spectra of free radicals formed in the radiolysis of benzen-2,1-diazoquinone-4-sulphonic acid in polycrystalline form have been recorded. Two different radical species were found; the f...
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Chapter
Standardization in Penicillium Identification
The cultural and morphological characters of 36 species of Penicillium were examined after growth at 25°C on Czapek yeast extract agar (Cya), malt extract agar (Mea), and 25% glycerol nitrate agar (G25N), in glas...
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Article
Fr and Ra fixation on some inorganic sorbents or mixed composite ion exchangers
Zinc and nickel hexacyanoferrates (II) present a high affinity for223Fr and no retention for223Ra in hydrochloric acid solutions with concentrations greater than 0.5N. Hydrated antimony pentoxide is the best sorb...
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Chapter
On Line Study of Neutron Deficient Hafnium Isotopes Using Fast Radiochemical Separations
We have developed and implanted at the accelerator Tandem MP of Orsay, a device for continuous and “on line” studies of short-life isotopes, named RACHEL (Rapid Aqueous Chemistry apparatus for Heavy ELements). Th...
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Article
Hafnium decontamination from microquantities of some elements of groups I, II and III
A method for deep decontamination of high spin178m2Hf isomer from microquantities of Sc, Fe, Co, Ni, Sb and Ag was elaborated using ion exchange separation on Dowex-1 in Hf and CH3COOH−HCl media.
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Article
Chemical isolation of element 106 from aqueous solutions according to model experiments with short-lived tungsten isotopes
The short-lived isotopes of W and their descendants have been isolated from the products of the bombardment of144Sm with24Mg by a fast continuous ion-exchange method, using HF solution media. The feasibility of t...
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Article
Fast and continuous chemical isolation of short-lived isotopes of Hf, Ta and W as homologs of elements 104, 105 and 106
Some short-lived isotopes of Hf, Ta and W, synthesized at the U-400 cyclotron of JINR-Dubna, have been isolated using a previously elaborated fast continuous method of chemical isolation of element 104 from nu...
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Article
Coulomb excitation of the Kπ=16+ rotational band in 178Hf
A heavy-ion multiple Coulomb excitation experiment on a very exotic target containing microweight quantities of 178Hf in the Kπn = 16+ isomeric state has been performed at 4.77 MeV/u 208Pb beam energy. The first ...
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Article
Adsorption of Zr, Hf, Nb, Ta and Pa on macroporous anion exchangers in HF medium
The behaviour of the elements Zr, Hf, Nb, Ta and Pa has been investigated on macroporous anion exchange resin BIORAD AGMP 1 in HF medium (from 0.02 to 2M). All the studied elements show strong adsorption prope...
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Article
On-line separation of short-lived tungsten isotopes from tantalum, hafnium and lutetium by adsorption on ion exchangers from aqueous ammonia solution
The title goal was achieved using a DOWEX 50Wx8 cation exchange column saturated with La(OH)3 and ammonia solution as eluent. Hf, Ta and Lu were adsorbed on this column, whereas W remained in the solution. This c...
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Article
Observation of photonuclear reactions on isomeric targets:178Hfm 2(γ,n)177Hf m 2,180Ta m ( γ , 2n)178Ta m,g and180Ta m (γ,p)179Hf m 2
Photonuclear reactions on isomeric and ground state Hf and Ta targets were studied systematically by activation technique. The reaction yields were measured and isomer-to-ground state ratiosY ...
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Article
Coulomb excitation of the Kπ=16+ rotational band in178Hf
A heavy-ion multiple Coulomb excitation experiment on a very exotic target containing microweight quantities of178Hf in the Kπ = 16+ isomeric state has been performed at 4.77 MeV/u208Pb beam energy. The first exc...
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Article
Purity determination of super-enriched176Yb by neutron activation and thermal neutron capture cross section measurement of the high-spin (16+) isomer178m2Hf
Neutron activation analysis has been applied to determine the purity of super-enriched176Yb as well as a diagnostic to optimize yields from the P.A.R.I.S. mass separator at Orsay. In 25 mass separations carried o...
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Article
Precise measurement of gamma-ray energies and gamma-ray emission probabilities in178m2Hf decay
Nowadays large interest is attached to the production of exotic beams and targets for nuclear structure and reaction studies. The nucleus178Hf, with is long-lived (T 1/2=31 years) high-spin isomeric statel π=16+ ...
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Article
Study of the168Hf electron capture decay
The (EC, β+) decay of168Hf, produced by the156Gd (16O,4n) reaction, has been studied, with high efficiency HPGe coaxial detectors, using on-line measurements with the RACHEL setup. Off-line measurements were also...
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Article
Production, chemical and isotopic separation of the178m2Hf high-spin isomer
The 178m2Hf with its long-lived (T1/2=31 y), high-spin Iπ = 16+, isomeric state, is a challenge for new and exotic nuclear physics studies. The 178m2Hf isomer has been produced in microweight quantities using the...
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Article
Hyperfine structure and isotope shifts in the 5d6s2 a2D3/2--5d6s(a3D)6p z4F5/2 ° transition of Hf II
The hyperfine structure and isotope shifts of the transition between the 5d6s2 a2D3/2 ground state and the 5d6s(a3D)6p z4F5/2 ° excited state of singly ionized hafnium at \lambda=340 nm have been ...
