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  • Chemistry  (38)
  • 23.20.Lv  (3)
  • 27.90+b  (3)
  • 1
    ISSN: 1434-601X
    Keywords: 23.60+e ; 27.90+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the bombardment of a 270μg/cm 2 180Hf target with48 Ca projectiles at a primary beam energy of E/A=4.24 MeV/u the new nuclide225U was produced. The experiment was performed at the velocity filter SHIP. 225U was found to decay by α emission with Eα=(7880 ±20) keV (≈90%), (7830±20) keV (≈10%) and has a half-life ofT 1/2=(80 −20 +40 ms).
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-601X
    Keywords: 21.60.Cs ; 23.20.Lv ; 27.70.+q
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The N=84 nucleus154Yb was investigated through the106Cd(54Fe,α2p) reaction. We found the 16+ yrast level in this nucleus to be formed by the (πh11/2 2 νf7/2h9/2) configuration, in contrast to the lower-Z isotones where (πh11/2 2 νf7/2 2)16+ is the yrast state. Manybody shell model calculations with empirical two-body interactions support our conclusion.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1434-601X
    Keywords: 23.20.Lv ; 21.60.Cs ; 27.70.+q
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In-beamγγ- andγγn-measurements have for the first time identified excited states in the 72 157 Hf85 nucleus and have established its yrast levels up to 6.5 MeV and I=(51/2). The results of parameter-free 11-particle recoupling calculations in the framework of the shell model for the configurationsπh 11 2/8 νf 7 2/3 andπh 11 2/8 νf 7 2/2 h9/2 are in excellent agreement with the observed levels up to 39/2 at 4.758 MeV. A weakly populated 52 ns 29/2+ yrast isomer at 2.876 MeV is assigned as the three-neutron configurationνf7/2h9/2i13/2.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1434-601X
    Keywords: 23.60+e ; 25.70.−z ; 27.90+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The neutron-deficient isotopes257,258105 were produced in the reaction27Al+236u in 6n and 5n evaporation channels, respectively. The evaporation residues emerging from the target were separated in-flight from the projectiles and from products of different nuclear reactions by the electrostatic separator VASSILISSA [1]. The isotopes were then implanted into position-sensitive silicon detectors and identified using the α-α-correlation method. The measured production cross-section is σ(5n)=(0.45±0.20)nb atE P =154 MeV and σ(6n)=(0.075±0.055) nb atE P =163 MeV. These cross-sections are compared with data measured for the same isotopes in the more symmetrical reaction50Ti+209Bi.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1434-601X
    Keywords: 23.60+e ; 27.90+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The neutron-deficient isotopes226Np and227Np were produced in the bombardment of a 380μg/cm2 209Bi target with22Ne projectiles at an incident beam energy of 5.5 MeV/u. They were identified using the α-α time-correlation method /1/.226Np was found to decay with Eα=(8044±20) keV andT 1/2=(31±8) ms. For227Np two α-lines were observed at (7650±20) keV and (7677±20) keV with a half-life of (510±60) ms. The gas-filled separator NASE installed at GSI Darmstadt was used to separate the evaporation residues inflight.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 21 (1990), S. 93-104 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Understanding the relationships between mechanical and other physico-chemical properties and the microstructural chemistry is a necessity for a well-controlled development of new materials. A prerequisite for the achievement of this goal is an advanced microanalytical characterization, which can be obtained by application of surface analysis methods. Among these, high resolution Auger electron spectroscopy (HR-AES or Scanning Auger Microscopy, SAM) has proved to be extremely useful for surface, interface and depth profile analysis of ceramic materials. After a short presentation of the principles and the main areas of application, specific advantages are discussed for some examples. Those are e.g. a depth of information in the nanometer range, a sub-micrometer lateral resolution, a relatively high detection sensitivity for the light elements like B, C, N, O, and a small matrix effect in quantitative analysis. The main disadvantages are due to a variety of detrimental electron beam induced effects which are outlined for some examples of oxide and non-oxide ceramics. The generation of electrical charging of insulating ceramics and its avoidance or reduction by appropriate experimental procedures is particularly emphasized.
    Notes: Das für eine kontrollierte Materialentwicklung benötigte Verständnis des Zusammenhangs zwischen mechanischen und anderen physikalisch-chemischen Eigenschaften und dem mikrostrukturellen Aufbau setzt eine leistungsfähige mikroanalytische Charakterisierung voraus, die vor allem durch den Einsatz oberflächenspezifischer Untersuchungsverfahren erhalten werden kann. Unter diesen hat sich insbesondere die hochauflösende Auger-Elektronenspektroskopie (High Resolution Auger-Electron Spectroscopy, HR-AES bzw. Scanning Auger Microscopy, SAM) in Verbindung mit Oberflächen-, Bruchflächen- und Tiefenprofilanalysen bewährt, deren Grundlagen und Haupteinsatzgebiete unter besonderer Berücksichtigung keramischer Werkstoffe vorgestellt werden. Den Vorteilen kleiner Informationstiefe im Nanometerbereich, der hohen Ortsauflösung im Sub-Mikrometer-Bereich, der vergleichsweise hohen Nachweisempfindlichkeit für leichte Elemente wie B, C, N, O sowie der geringen Matrix-Effekte bei der quantitativen Analyse stehen als Nachteile eine Reihe störender elektronenstrahlinduzierter Effekte gegenüber. Diese werden anhand ausgewählter Beispiele für oxidische- und nichtoxidische Keramiken erläutert, wobei besondere Betonung auf die Entstehung von elektrischen Aufladungen bei nichtleitenden Keramiken und deren Vermeidung bzw. Verminderung durch geeignete experimentelle Maßnahmen gelegt wird.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 325 (1986), S. 37-43 
    ISSN: 1434-601X
    Keywords: 23.20.Lv ; 29.30.Cm ; 28.60.+s
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Fusion evaporation reactions were investigated to search for short lived isomeric states of nuclei near the proton drip line. Gamma spectra were measured, both singles and in delayed coincidence with evaporation residues implanted into a silicon detector after a velocity separation. A short lived activity was measured in the40Ca+40Ca →80Zr* reaction at excitation energies between 55 and 79 MeV. A half-life of 3.20 (10) μs was determined from delayed coincidences between evaporation residues and gamma rays. AtE *=55 MeV the cross section is 9 mb. The activity was assigned to an isomeric state in76Rb by investigation of excitation functions. The isomer decays by emission of four gamma rays with energies of 70.55(5), 101.30(4), 145.11 (5), and 246.32(10) keV. A first level scheme is proposed assigning to the isomeric state an energy of 316.94(7) keV above the ground state. The isomer decaying into the low spin 1(−) ground state band is explained from systematics as a band head of a high spin (4+) (πg9/2,νg9/2) structure. A high hindrance factor of 3×106 forE1 radiation compared to a single particle transition is due possibly to a change of the core particle structure in the transition.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 42 (1991), S. 169-178 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Auger-spectroscopic investigations into pitting corrosion of FeCr, FeMo and FeCrMo alloysA single pit was produced on binary iron-chromium (Fe17Cr), iron-molybdenum (Fe1Mo, Fe3Mo, and Fe5Mo) and ternary iron-chromium-molybdenum alloys (Fe17CrxMo, x = 1, 3, 7 wt.%) in 0.5 M H2SO4 with Cl- additions (0.02 to 0.08 molar) at room temperature. Compositional changes at the bottom of the pit and in the surrounding passive film were determined using high resolution Auger-Electron Spectroscopy (AES). The chromium and molybdenum content of the passive layers are not changed in the presence of Cl- and there is no incorporation of chlorine in the passive film as long as the films were formed in a chlorine-free electrolyte and Cl- was added later. At the bottom of the pits salt films could be determined in all cases after removing the electrolyte with filter paper. These salt films are strongly enriched in chromium, molybdenum and chlorine. The salt film was not detectable for Fe-Cr after rinsing the samples with distilled water, whereas in the case of molybedenum additions the salt film could not be washed away with water.
    Notes: Ein einzelnes Loch wurde auf der passiven Oberfläche von Eisen-Chrom-(Fe17Cr), Eisen-Molybdän-(Fe1Mo, Fe3Mo und Fe5Mo) und ternären Eisen-Chrom-Molybdän-Legierungen (Fe17CrxMo, x = 1, 3, 7 Gew.%) durch Lochkorrosion in 0,5 M H2SO4 mit Cl--Zusätzen von 0,02 und 0,08 Mol/l bei Raumtemperatur erzeugt. Die Zusammensetzung des Lochbodens und der umgebenden Passivschicht wurde mit Hilfe der hochauflösenden Augerelektronenspektroskopie (AES) bestimmt. Der Chrom- und Molybdängehalt des Passivfilmes wird durch die Anwesenheit der Cl--Ionen nicht verändert, und es wird kein Chlor in den Passivfilm eingebaut, solange der Film in chloridfreiem Elektrolyt gebildet und Cl- später zugesetzt wurde. Auf dem Lochboden konnten in allen Fällen Salzfilme festgestellt werden, nachdem der Elektrolyt mit Filterpapier aufgesogen wurde. Diese Salzfilme waren stark mit Chrom, Molybdän und Chlor angereichert. Bei der Fe-Cr-Legierung konnte der Salzfilm nach Spülung mit Wasser nicht mehr nachgewiesen werden, während bei den molybdänhaltigen Legierungen der Salzfilm mit Wasser nicht entfernt werden konnte.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 89-89 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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