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  • 1975-1979  (11)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Ultracold neutrons (1978)
    [s.l.] : Nature Publishing Group
    Nature 272 (1978), S. 127-128 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ULTRACOLD neutrons are slow neutrons with velocities of less than 7ms"1. In order both to study their properties and their interactions with matter and to use them for experiments in fundamental physics they must be stored and up to now this has raised various problems. Charged particles such as ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/272127a0
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal neutron induced charged particle reactions on58,59,61Ni (1977)
    Springer
    The European physical journal 282 (1977), S. 375-381 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal neutron induced charged particle spectroscopy on58, 59, 61Ni (target nuclei) was done at the 87 m thermal neutron curved guide of the Grenoble high flux reactor. In the59Nu(n, α)56Fe reaction two lines showed up corresponding toα-particle transitions to the ground and first excited states in56Fe with σα0=13.1±1.1 b and σα1 =0.188±0.01 b. A value of σγα≦13 mb was obtained for the two-step59Ni(n, γα)56Fe reaction. The technique to unfold theγα-spectrum and to get information on the primary low energyγ-rays is given and the present and our previous data on the143Nd(n, γα)140Ce reaction are analysed. For the59Ni(n, p)59Co reaction p0=1.34±0.18b,σ p1〈0.30 b were determined. The cross-sections for the58Ni(n,α)55Fe and61Ni(n,α)58Fe reactions were σα0≦30 Μb and σα0≦30 Μb respectively; these andσ p1upper limit value are about 20–1500 times lower than the existing data. The other results are compared with the existing data and the differences are explained. The experimental data are compared with the values obtained from the statistical model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01434292
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Gamma-ray spectroscopy of short-lived fission products using the recoil separator “Lohengrin” (1975)
    Springer
    The European physical journal 273 (1975), S. 283-289 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract γ-spectra and half-lives of90Br,95Rb,96Rb,96Sr,96Y,132Sb and132Sn have been measured using the unslowed fission fragment separator “Lohengrin”. Preliminary decay schemes for90Kr,95Sr,96Sr and96Y are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410011
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal neutron induced charged particle reactions in radioactive targets of37Ar,109Cd,125Xe,127Xe, and132Cs (1978)
    Springer
    The European physical journal 288 (1978), S. 45-48 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Thermal neutron induced charged particle reactions in a radioactive target of37Ar have been studied. Upper limits of the cross-sections for the (n, α) reaction in radioactive targets of109Cd,125, 127Xe, and132Cs have been obtained. The isotopically pure targets were produced at the ISOLDE facility at CERN and irradiated with thermal neutrons at the high flux reactor of the Institute Laue-Langevin in Grenoble. Charged particles from (n, p) and (n, α) reactions in37Ar were observed with cross-sections of 69±14b and 1970 ±330b, respectively. TheQ-values for these reactions were determined to be 1600 ±12 keV and 4630±7 keV, in agreement with existing mass data. The branching ratio Γα/Γp of the37Ar capturing state was found to be 28.5±2.7. An upper limit of the cross-section for the (n, γα) reaction in37Ar was obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408200
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  • 5
    Electronic Resource
    Electronic Resource
    The (n th, α)-reaction on95Mo,123Te and145Nd (1975)
    Springer
    The European physical journal 275 (1975), S. 157-161 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Then th,α)-reaction spectroscopical data are reported on95Mo,123Te and145Nd (target nuclei). The95Mo(n, α)92Zr and123Te(n, α)120Sn reactions showed up two lines each corresponding to the ground state and the 1st excited state with a total cross section of 32 ub and 52 μb respectively. In the case of145Nd(n, α)142Ce, a transition only to the 1st excited state of142Ce is present. It is shown that in the case of95Mo,145Nd and probably123Te, most of the cross-section comes respectively from the 2+ possibly 4−, and 0 bound levels whose widths are determined to beΓ α=0.5 × 10−6 eV,Γ α=1.6×10−8 eV andΓ α=1.6 × 10−6 eV. The present results on these three nuclei, when combined with the existing data, are consistent with the calculated statistical model values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01409591
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  • 6
    Electronic Resource
    Electronic Resource
    Nuclear charge distributions from 4π-β measurements on mass separated fragments from235U(n th ,f) (1976)
    Springer
    The European physical journal 277 (1976), S. 71-75 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A 4π-β detector was used at the Lohengrin mass separator to measure theβ-activity of mass chains 91, 93, 94, 95, 137 and 139 produced in the thermal neutron induced fission of235U. This activity was analysed intoZ-yields. The different possible corrections were considered and applied to the data. TheZ-yields from this work are compared with the diverse existing results obtained with other methods. The need for and significance of this method to determine theZ-distribution of fission fragments of the heavy group is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01547504
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  • 7
    Electronic Resource
    Electronic Resource
    The sub-barrier photo-fission and the232Th fission barrier profile (1978)
    Springer
    The European physical journal 286 (1978), S. 299-300 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The232Th sub-barrier photo-fission data have been analysed in terms of the predicted triple-humped barrier. It is shown that these results and particularly the isomeric shelf seen in these data cannot be explained as being due to the 2nd minimum. However, one can explain these results in terms of the 3rd minimum on the assumptions thatE III (the energy of the 3rd minimum relative to the ground state energy) ≈ 3 MeV instead ofE III≈4.5 MeV as generally thought and the isomeric state in this well is fed and decays like the heavier actinides with double-humped barriers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408260
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  • 8
    Electronic Resource
    Electronic Resource
    Search for the (n th, α) reaction on180Hf,181Ta and209Bi (1978)
    Springer
    The European physical journal 286 (1978), S. 411-414 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The (n th,α) reaction on180Hf,181Ta and209Bi was studied at the thermal neutron guide of the Grenoble high flux reactor. Upper limits ofσ α ≦13μb, ≦μb and ≦0.3μb, respectively, were obtained for the a branches to the ground states in contrast to the values of ≈100μb to ≈500 mb reported in the literature. Possible reasons for these discrepancies are discussed. Furthermore, the present upper limits of the cross sections are compared with the values calculated from the statistical model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408899
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  • 9
    Electronic Resource
    Electronic Resource
    Experimental beta-decay energies of short-lived light fission products (1978)
    Springer
    The European physical journal 284 (1978), S. 95-104 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The beta-decay energy of 20 nuclides in the mass region 88≦A≦102 has been measured using the on-line mass separator LOHENGRIN. The experimental values obtained are compared with theoretical predictions of different mass formulae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01433881
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  • 10
    Electronic Resource
    Electronic Resource
    Half-lives andP n values of delayed-neutron precursors in the mass chains 85–87, 92, 135, 136 and 145 (1978)
    Springer
    The European physical journal 287 (1978), S. 45-50 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Further results are presented on half-lives and neutron emission probabilities (P n ) of short-lived delayed-neutron precursors in the mass chains 85–87, 92, 135, 136 and 145 obtained with the recoil focussing parabola-type mass separator for unslowed fission products LOHENGRIN installed at the Grenoble high-flux reactor. A newP n -value of (44±14)% is given for the (0.73±0.06)s87As; theP n -values of seven precursor nuclides have been redetermined: (1.9±0.1)s85As with (22±8)%, 0.9s86As with (10.5±2.2)%, (0.35±0.04)s92Br with (21±8)%, (1.6±0.15)s135Sb with (14±1)%, (0.9±0.1)s136Sb with (19±9)%, (17.5±0.2)s136Te with (2.0±1.0)% and 0.6s145Cs with (12.5±3.0)%. The results are compared with the existing data, and the neutron emission probabilities are discussed within a simple semi-empirical picture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408359
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