Skip to main content

24 Result(s)

within O. Constantinescu Remove this filter

previous disabled Page of 2
and

  1. No Access

    Article

    Search for neutron resonances in the \(^{178m_2 } Hf\) isomer and their investigation

    Experiments aimed at detecting and investigating neutron resonances in the \(^{178m_2 } Hf\) isomer are described, ...

    G. V. Muradian, O. Ya. Shatrov, M. A. Voskanian… in Physics of Atomic Nuclei (2003)

  2. No Access

    Article

    Trace analysis of ancient gold objects using radiochemical neutron activation analysis

    Radiochemical neutron activation analysis has been applied to investigate the microelements in gold samples with archaeological importance. Chemical separation has allowed the determination of traces of Ir, Os...

    A. Olariu, M. Constantinescu… in Journal of Radioanalytical and Nuclear Che… (1999)

  3. No Access

    Article

    On line ion exchange separation of short-lived Zr, Hf, Mo, Ta and W isotopes as homologs of transactinide elements

    The short-lived isotopes of W and their descendants have been separated from nuclear reaction products arising in the bombardment of samarium target with24Mg ions at the U-400 cyclotron of JINR-Dubna. Chemical se...

    Z. Szeglowski, L. I. Guseva, Dinh Thi Lien… in Journal of Radioanalytical and Nuclear Che… (1998)

  4. No Access

    Article

    Instrumental neutron activation analysis of the hair of metallurgical workers

    Hair samples were collected from 20 metallurgical workers (10 males and 10 females) and from 59 control subjects (32 males and 27 females), whose jobs do not indicate a specific occupational exposure. The conc...

    R. Georgescu, A. Pantelica, M. Salagean… in Journal of Radioanalytical and Nuclear Che… (1997)

  5. No Access

    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 ...

    W.Z. Zhao, F. Buchinger, J.E. Crawford, S. Fedrigo, S. Gulick… in Hyperfine Interactions (1997)

  6. No Access

    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...

    Yu.Ts. Oganessian, M. Hussonnois, Ch. Brianôcon, S.A. Karamian… in Hyperfine Interactions (1997)

  7. No Access

    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...

    J. B. Kim, D. Trubert, O. Constantinescu… in Journal of Radioanalytical and Nuclear Che… (1997)

  8. No Access

    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+ ...

    J. B. Kim, J. Morel, M. Etcheverry… in Journal of Radioanalytical and Nuclear Che… (1997)

  9. No Access

    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...

    D. Trubert, M. Hussonnois, L. Brillard… in Journal of Radioanalytical and Nuclear Che… (1997)

  10. No Access

    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 ...

    S. A. Karamian, J. de Boer… in Zeitschrift für Physik A Hadrons and Nuclei (1996)

  11. No Access

    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...

    E. Lubkiewicz, H. J. Wollersheim, R. Kulessa… in Zeitschrift für Physik A Hadrons and Nuclei (1996)

  12. No Access

    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...

    F. Monroy-Guzman, D. Trubert, L. Brillard… in Journal of Radioanalytical and Nuclear Che… (1996)

  13. No Access

    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...

    D. Schumann, R. Dressler, St. Taut… in Journal of Radioanalytical and Nuclear Che… (1996)

  14. No Access

    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 ...

    E. Lubkiewicz, H. J. Wollersheim, R. Kulessa… in Zeitschrift für Physik A Hadrons and Nuclei (1996)

  15. No Access

    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...

    Z. Szeglowski, H. Bruchertseifer… in Journal of Radioanalytical and Nuclear Che… (1996)

  16. No Access

    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...

    Z. Szeglowski, H. Bruchertseifer… in Journal of Radioanalytical and Nuclear Che… (1994)

  17. No Access

    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.

    Z. Szeglowski, Dinh Thi Lien, M. Hussonnois… in Journal of Radioanalytical and Nuclear Che… (1994)

  18. No Access

    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...

    D. Trubert, M. Hussonnois, J. F. Le Du, L. Brillard… in Frontier Topics in Nuclear Physics (1994)

  19. No Access

    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...

    C. Loos-Neskovic, B. Bartos, M. Hussonnois… in Journal of Radioanalytical and Nuclear Che… (1991)

  20. No Access

    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...

    O. Constantinescu in Modern Concepts in Penicillium and Aspergillus Classification (1990)

previous disabled Page of 2