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  • 24.80.Dc  (1)
  • Nuclear structure  (1)
  • PACS. 61.12.-q Neutron diffraction and scattering – 61.12.Ex Neutron scattering techniques (including small-angle scattering) – 66.10.Cb Diffusion and thermal diffusion  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Low-lying positive parity states in ^1^9^5Ir following double neutron capture
    Amsterdam : Elsevier
    Nuclear Physics, Section A 465 (1987), S. 240-264 
    Details
    ISSN: 0375-9474
    Keywords: Nuclear reactions ; Nuclear structure
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(87)90433-7
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Parity nonconservation and Brosa modes in nuclear fission (1995)
    Springer
    The European physical journal 351 (1995), S. 281-288 
    Details
    ISSN: 1434-601X
    Keywords: 24.80.Dc ; 25.85.Ec
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The parity nonconserving (PNC) asymmetry coefficient α for the angular distribution of fragment emission from binary fission of233U irradiated by polarized thermal neutrons has been measured. Complementary fragments were detected by a double ionization chamber with high resolving power. The experiment was carried out at the high flux reactor of the ILL, Grenoble. Integrated over all masses and energies of light fragments from asymmetric fission of234Uh, the PNC asymmetry coefficient is found to be α=(3.29±0.31) × 10−4.The positive sign of α indicates a preferential emission of light fragments parallel to the spin of neutrons inducing fission. Theory claims that PNC effects are sensitive to the properties of the fission barrier. On the other hand, one may wonder whether characteristics of eventual fragments are already specified at the barrier. The measurement of PNC asymmetries for distinct mass-energy ranges of fragments has been utilized to answer this question. Mass-energy distributions of fragments were analyzed along the lines of the Brosa model of fission as a superposition of individual modes. Within experimental uncertainty no mode dependence of asymmetric fission could be disclosed. The result is in keeping with the Brosa model where asymmetric modes bifurcate only once the standard fission barrier has been passed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290909
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental study of quasi-elastic scattering of ultracold neutrons (2002)
    Springer
    The European physical journal 28 (2002), S. 299-304 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 61.12.-q Neutron diffraction and scattering – 61.12.Ex Neutron scattering techniques (including small-angle scattering) – 66.10.Cb Diffusion and thermal diffusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Ultracold neutrons (UCN) are lost from traps if they are quasi-elastically scattered from the wall with an energy gain sufficient to exceed the Fermi potential for the wall. Possible mechanisms of a quasi-elastic energy transfer are, for instance, scattering from hydrogen diffusing in an impurity surface layer or on surface waves at a liquid wall. Using two different experimental methods at the UCN source of the Institut Laue-Langevin we have investigated both the energy-gain and the energy-loss side of quasi-elastic UCN scattering on Fomblin grease coated walls. For Fomblin oil and similar new types of oil we report up-scattering data as a function of temperature and energy transfer. These low-temperature oils may be used in an improved measurement of the neutron lifetime, which requires extremely low wall reflection losses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2002-00233-7
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    Paper (German National Licenses)
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