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  • 25.85.Ec  (2)
  • 28.20.Cz  (2)
  • 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
    Digitale Medien
    Digitale Medien
    Cooling of ultracold neutrons during their long storage in a trap (1998)
    Springer
    JETP letters 68 (1998), S. 691-695 
    Details
    ISSN: 1090-6487
    Schlagwort(e): 28.20.Cz
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have observed the cooling of ultracold neutrons during their long storage in a trap, with a probability estimated as 1×10−6/reflection and with an energy transfer of about 3 neV.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.567930
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  • 2
    Digitale Medien
    Digitale Medien
    Experimental check of the dispersion law for ultracold neutrons (1998)
    Springer
    JETP letters 67 (1998), S. 786-792 
    Details
    ISSN: 1090-6487
    Schlagwort(e): 28.20.Cz ; 11.55.Fv
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract An experiment to check the standard dispersion law for ultracold neutrons is described. The experiment is based on searching for a shift of the resonance line of a neutron interference filter as the neutron velocity component parallel to the filter surface is varied. The first results attest to a statistically significant effect. No mimicking effects were found in a control experiment, but their possible existence cannot be completely ruled out at present.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.567749
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  • 3
    Digitale Medien
    Digitale Medien
    Parity nonconservation and Brosa modes in nuclear fission (1995)
    Springer
    The European physical journal 351 (1995), S. 281-288 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 24.80.Dc ; 25.85.Ec
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01290909
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  • 4
    Digitale Medien
    Digitale Medien
    Cold deformed fission in232U(n, f) and239Pu(n, f) (1992)
    Springer
    The European physical journal 341 (1992), S. 319-326 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 25.85.Ec
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Masses, charges and kinetic energies of light fission fragments from the reactions232U(n, f) and239Pu(n, f) induced by thermal neutrons have been measured on the Cosi fan tutte spectrometer of the Institut Laue-Langevin in Grenoble. Both at very high and very low kinetic energies marked fine structures in the mass yields and odd-even staggerings in the charge yields are observed. In the framework of a scission point model the results are shown to point to compact and deformed scission configurations, respectively, where at scission the fragments carry no intrinsic excitation energy. The two limiting processes may, therefore, be called cold compact fission (usually known as cold fission) and cold deformed fission. The latter process as a general phenomenon of low energy fission has come into focus only recently.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01283541
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  • 5
    Digitale Medien
    Digitale Medien
    Experimental study of quasi-elastic scattering of ultracold neutrons (2002)
    Springer
    The European physical journal 28 (2002), S. 299-304 
    Details
    ISSN: 1434-6036
    Schlagwort(e): 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
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjb/e2002-00233-7
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