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  • Electronic Resource  (24)
  • Inorganic Chemistry  (19)
  • 21.10.Dr  (3)
  • 25.70.Jj  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Evidence for quasi-fission in40Ar+208Pb collisions near the coulomb-barrier (1987)
    Springer
    The European physical journal 326 (1987), S. 313-326 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Jj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Fission-fragment angular distributions were measured in the reaction of40Ar with208Pb near the fusion barrier. For nearly symmetric mass-/charge splits we find angular distributions symmetric around θ=90 degrees, however, with unusually large anisotropies. These develop gradually into forward-backward asymmetric distributions as one moves away from mass-/charge symmetry. This indicates that non-compound fission (‘quasi-fission’) competes with true fusion-fission. The relative contribution of quasi-fission to the total fission cross section is somewhere between 51 and 85%. In the framework of the extra-push model this is equivalent to an extra-extra push energy for compound-nucleus formation inside the true fission saddle point of 4〈E xx 〈9 MeV in agreement with a recent empirical parametrization of fusion-barrier shifts based on fusion-fission cross sections. On the basis of cross sections for fusion-evaporation residues it had previously been concluded that fusion of40Ar with Pb isotopes occurs unhindered. Possible reasons for this apparent discrepancy are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01297586
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  • 2
    Electronic Resource
    Electronic Resource
    Competition between binary reactions and fusion in heavy-ion collisions at the Coulomb barrier (1992)
    Springer
    The European physical journal 342 (1992), S. 411-427 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Cd ; 25.70.Jj ; 25.70.Lm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mass and charge distributions for binary reaction channels have been measured for the reactions86Kr with76Ge,104Ru and130Te at the Coulomb barrier using chemical separations andγ-ray spectroscopy. These systems span the region where dynamical hindrance to complete fusion sets in. The binary reactions can be subdivided into two components associated withi) reflection from the outer potential barrier (quasielastic), andii) reseparation after passing the barrier (complex reactions). The sum of complex-reaction channels and evaporation residues from complete fusion can be reproduced by a barrier passing calculation. The fraction of the barrier passing flux leading to reseparation increases from 26±10% for the lightest system to more than 90% for the heaviest system. The data indicate that fusion hindrance is primarily caused by reseparation shortly after passage of the barrier before Swiatecki's conditional saddlepoint is overcome, resulting in partitions close to the entrance channel configuration. In addition, for the heaviest system, a quasifission component representing somewhat less than 20% of the barrier-passing flux was observed. From the missing masses of fragment pairs we can deduce that the reseparating complex-reaction products have kinetic energies well below the fusion barrier and share the excitation energy in a way similar to the sawtooth-like curve known from low-energy fission. The quasielastic, predominantly one- and two-nucleon transfer channels, have strongly varying cross sections for the three systems despite similar effectiveQ-values. A systematics of one-neutron transfer cross sections at the Coulomb barrier is established and shown to differ considerably from the smooth behaviour observed at energies 20–30% above the barrier. The connection to nuclear polarization phenomena and orbit matching is pointed out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294952
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  • 3
    Electronic Resource
    Electronic Resource
    β +-endpoint measurements near100Sn and146Gd (1991)
    Springer
    The European physical journal 340 (1991), S. 363-370 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Dr ; 23.40.−s ; 27.60.+j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract With a summation-free β+-endpoint spectrometer the β+-decay energies of104Sn,147Tb,148, 149Dy,149Ho,150Er, and151Tm were remeasured with improved accuracy. Combined with known proton and alpha decay energies, the resulting QEC values lead to atomic masses of very neutron-deficient isotopes including nuclei beyond the proton drip-line such as109I and113Cs. Furthermore, the Gamow-Tellerβ-strength of the even-even nuclei104Sn,148Dy, and150Er is reevaluated with reduced uncertainty.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290323
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  • 4
    Electronic Resource
    Electronic Resource
    Q EC value and Gamow-Teller strength of the102CdEC/gb+ decay (1991)
    Springer
    The European physical journal 339 (1991), S. 355-361 
    Details
    ISSN: 1434-601X
    Keywords: 23.40.Hc ; 21.10.Dr ; 21.10.Pc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Within the framework of a systematic study of 0+→1+ Β-transitions in the100Sn region, the decay of the neutrondeficient isotope102Cd was investigated. This isotope was produced in16O+92Mo and58Ni+50Cr heavy-ion reactions and in proton-induced spallation ofnatSn, and mass-separated samples were prepared by means of the GSI and the ISOLDE on-line mass separators, respectively. Observations of X-rays,γ-rays, and conversion-electrons studies have led to an improved102Cd→102Ag decay scheme which includes six 0+→1+ Gamow-Teller transitions. The half-life of102Cd was redetermined with higher accuracy to be 345±8 s. Using a Si(Li)-BGO-Ge spectrometer, theΒ + endpoint energy of the main decay component was measured, yielding aQ EC value of 2587±8 keV. This very small uncertainty ofQ EC, combined with the improved knowledge of half-life and decay scheme, allows an accurate determination of the observed Gamow-Teller decay strengthB Σ (GT)=1.513±0.055 for102Cd. This result is discussed in comparison with predictions from model calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01560637
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  • 5
    Electronic Resource
    Electronic Resource
    Beta-decay energy and atomic mass of148Tb (1995)
    Springer
    The European physical journal 352 (1995), S. 1-2 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Dr ; 27.60.+j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Q EC values of the $${}^{148}Tb_{2^ - } $$ ground-state and the $${}^{148}Tb_{9^ + } $$ isomer were measured to the 5750(40) keV and 5846(50) keV, respectively, corresponding to a148Tb ground-state mass-excess of ⦓70527(30) keV. The impact on mass calculations near146Gd is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292750
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  • 6
    Electronic Resource
    Electronic Resource
    Ag2PdCl4, Kristallstruktur und die kristallchemische Beziehung zum NaCl-Typ (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 562 (1988), S. 123-130 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ag2PdCl4, Crystal Structure and the Crystal Chemical Relation to the NaCl TypeAg2PdCl4 single crystals show orthorhombic symmetry with the space group Cmca (No. 64) and the lattice parameters a = 10.088(2), b = 8.051(5), c = 8.078(2) å, with 4 formular units per unit cell. The atomic arrangement of Ag2PdCl4 is explored by X-ray crystal structure analysis.Silver shows a distorted octahedral arrangement of chlorine atoms. Palladium forms typical, approximately square-planar PdCl4 groups. Ag2PdCl4 is a new variant of a partially occupied sodium chloride structure type.
    Notes: Die Kristallstruktur von Ag2PdCl4 wurde mit röntgenographischen Methoden an Einkristallen ermittelt. Ag2PdCl4 kristallisiert mit orthorhombischer Symmetrie: Cmca (No. 64), a = 10,088(2), b = 8,051(5), c = 8,078(2) å mit 4 Formeleinheiten pro Elementarzelle.Silber besitzt eine verzerrt oktaedrische Chlor-Nachbarschaft, während das Palladium annähernd quadratisch planare PdCl4-Gruppen bildet. Ag2PdCl4 stellt eine neue Variante einer teilbesetzten Natriumchloridstruktur dar.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885620115
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  • 7
    Electronic Resource
    Electronic Resource
    Die Kristallstruktur von AgPb4O4CI, eine kuriose Variante des Blei(II)-oxid-Strukturtyps (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 566 (1988), S. 62-70 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure of AgPb4O4Cl, a Curious Variant of the Tetragonal Structure Type of PbOAgPb4O4Cl was prepared for the first time and the crystal structure was explored by single crystal measurement. The compound crystallizes with tetragonal symmetry in space group P4/n - No. 85 with a = 8.197(2) Å, c = 6.257(4) Å and two formulae per unit cell. The structure was refined by full matrix least-squares techniques to an R value of 0.049. AgPb4O4Cl shows a typical layer structure. Layers of Pb2+, Ag+ and O2- are separated by chloride layers. The crystal-chemical relations to the structural arrangement of the tetragonal modification of PbO is shown.
    Notes: AgPb4O4Cl wurde erstmalig dargestellt und die Kristallstruktur an Einkristallen aufgeklärt. AgPb4O4Cl kristallisiert tetragonal (Raumgruppe P4/n - No. 85) mit a = 8,197(2) Å, c = 6,257(4) Å und Z = 2. Die Verfeinerung der Einkristallmessung mittels der Methode der kleinsten Fehlerquadrate ergab den Gütefaktor Rw = 0.049. AgPb4O4Cl zeigt eine Schichtstruktur, wobei Chloridionen die Schichten aus Pb2+, Ag+ und O2- trennen. Die kristallchemische Beziehung zum Aufbau der tetragonalen Modifikation von PbO wird dargelegt.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885660109
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  • 8
    Electronic Resource
    Electronic Resource
    Trigonal-planare CuX3-Gruppen in Cu2Mo6X14, X = Cl, Br, IProfessor Herbert Jacobs zum 60. Geburtstag gewidmet (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 663-669 
    Details
    ISSN: 0044-2313
    Keywords: Dicopper(I)-octa-μ3-halogeno-hexahalogeno-octahedro-hexamolybdate(II) ; crystal structure ; Mo6X14-group ; trigonal planar CuX3-group ; ionic conduction ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Trigonal Planar CuX3-Groups in Cu2Mo6X14, X = Cl, Br, ICu2Mo6Cl14 (I), Cu2Mo6Br14 (II) and Cu2Mo6I14 (III) were synthesized by thermal treatment of corresponding mixtures of copper(I) and molybdenum(II) halides. The crystal structures were determined by single crystal X-ray analyses. I and II show isotypism, cubic, Pn3 (no. 201, sec. setting), Z = 4, I: a = 12.772(3) Å, II: a = 13.350(2) Å. III shows a new structural type, orthorhombic, Pbca (No. 61), Z = 4, a = 16.058(3) Å, b = 10.643(2) Å, c = 16.963(3) Å. Trigonal planar CuX3 units were found in I—III. Structural behaviour relations are discussed, especially with regard to ionic conductivity.
    Notes: Cu2Mo6Cl14 (I), Cu2Mo6Br14 (II) und Cu2Mo6I14 (III) wurden durch thermische Behandlung der Gemenge der binären Halogenide CuX und Mo6X12 im molaren Verhältnis 2:1 in einkristalliner Form erhalten. Röntgenographische Strukturbestimmung wurde an Einkristallen durchgeführt. I und II zeigen Isotypie, Pn3 (Nr. 201, sec. setting) Z = 4, I: a = 12,772(3) Å, II: a = 13,350(2) Å. III weist eigenen Strukturtyp auf: Pbca (Nr. 61), Z = 4, a = 16,058(3) Å, b = 10,643(2) Å, c = 16,963(3) Å. In I—III liegen trigonal planare CuX3-Gruppen vor. Bindungsverhältnisse und Meßergebnisse der Ionenleitfähigkeit werden diskutiert.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966220415
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  • 9
    Electronic Resource
    Electronic Resource
    Pb2PdX6 (X = Cl, Br) - Verbindungen mit gestreckten [PdX6]-OktaedernProfessor Hanskarl Müller-Buschbaum zum 65. Geburtstage gewidmet (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1231-1235 
    Details
    ISSN: 0044-2313
    Keywords: Dilead(II)-hexahalogenopalladate(II) ; crystal structure ; strongly elongated PdX6 octahedra ; DTA, IR/RAMAN, 207Pb MAS NMR ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pb2PdX6 (X = Cl, Br) - Compounds with Elongated [PdX6] OctahedraIn contradiction to published data new compounds in the systems PbX2 - PdX2 (X = Cl, Br) with the formula Pb2PdCl6 (I) and Pb2PdBr6 (II) were found. These were synthesized by thermal treatment of the corresponding mixtures of PbX2 and PdX2 (X = Cl, Br). X-ray single crystal structure analysis shows isotypism of I and II, monoclinic, P21/c (No. 14), Z = 2, I: a = 9.037(2) Å, b = 6.224(1) Å, c = 8.162(1) Å, β = 90.31(7)β, II: a = 9.512(7) Å, b = 6.584(8) Å, c = 8.383(3) Å, β = 90.07(5)º. Strongly elongated PdX6 octahedra are found in the crystal structure. Additional characterisation of the compounds was done by DTA, IR/RAMAN spectra and 207Pb MAS NMR investigations. Remarcable low field shifts were found for 207Pb.
    Notes: Entgegen Literaturangaben wurden in den Systemen PbX2 - PdX2 (X = Cl, Br) die neuen Verbindungen Pb2PdCl6(I) und Pb2PdBr6(II) aufgefunden. Sie wurden durch thermische Behandlung der binären Halogenide PbX2 und PdX2 im molaren Verhältnis 2:1 dargestellt (Einkristalle). Die Kristallstrukturen wurden mit Einkristallröntgenuntersuchungen ermittelt. I und II sind isotyp, monoklin, P21/c (Nr. 14), Z = 2, I: a = 9,037(2) Å, b = 6,224(1) Å, c = 8,162(1) Å, β = 90,31(7)º, II: a = 9,512(7) Å, b = 6,584(8) Å, c = 8,383(3) Å, β = 90,07(5)º. In Pb2PdX6 werden stark gestreckte PdX6-Oktaeder beobachtet. Die Verbindungen wurden außerdem mittels DTA, IR/RAMAN-Spektren und 207Pb-MAS-NMR-Untersuchungen charakterisiert. Für 207Pb wurde eine bemerkenswerte Tieffeldverschiebung beobachtet.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966220721
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  • 10
    Electronic Resource
    Electronic Resource
    HgPb2O2Cl2, ein „perforiertes“ Blei(II)-oxidProfessor Friedo Huber zum 65. Geburtstage gewidmet (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 977-980 
    Details
    ISSN: 0044-2313
    Keywords: Mercury(II) lead(II) oxide chloride ; synthesis ; crystal structure ; structural comparison ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: HgPb2O2Cl2, a “Perforated” Lead(II) OxideSingle crystals of HgPb2O2Cl2 were grown in a HgCl2 flux by reaction of PbO with HgCl2. Crystal structure analysis by single crystal X-ray methods were carried out. HgPb2O2Cl2 crystallizes monoclinic with a = 11.788(2) Å, b = 3.910(1) Å, c = 7.749(2) Å, β = 122.64(3)°, space group C2/m (No. 12) and Z = 2. HgPb2O2Cl2 is the first member of a new structure type, closely related to the structure of PbO.
    Notes: Einkristalle von HgPb2O2Cl2 wurden durch Umsetzung von PbO und HgCl2 in HgCl2-Schmelzen gezüchtet. An ihnen wurde der Aufbau mittels Einkristallröntgenstrukturanalyse bestimmt. HgPb2O2Cl2 kristallisiert monoklin mit a = 11,788(2) Å, b = 3,910(1) Å, c = 7,749(2) Å, β = 122,64(3)°, Raumgruppe C2/m (Nr. 12) und Z = 2. HgPb2O2Cl2 ist der erste Vertreter eines neuen Strukturtyps, der kristallchemisch von der Struktur von PbO ableitbar ist.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200604
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