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  • 24.80.Dc  (1)
  • 25.40  (1)
  • 27.70+q  (1)
  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    An unusualM1 electromagnetic transition connecting octupole and quadrupole vibrations in179Hf (1985)
    Springer
    The European physical journal 322 (1985), S. 43-47 
    Details
    ISSN: 1434-601X
    Keywords: 25.40 ; 27.70+q ; 21.10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A detailed level scheme for179Hf has been constructed on the basis of extensive (n, γ), (d, p) and (d, t) data. The low lying levels are grouped into 15 rotational bands of which 14 are classified by Nilsson quantum numbers or vibrational configurations. One of the most interesting results concerns a dominant transition matrix element which connects an octupole vibration built on the 1/2[510] Nilsson orbit with a quadrupole vibration built on the 9/2+ [624] Nilsson ground state. A simple interpretation of this unusual decay mode is offered in terms of microscopic wave functions for the vibrational states. This interpretation leads to reasonable estimates forE1 hindrance factors from the octupole vibration to lower lying quasi-particle levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412016
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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