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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 327 (1987), S. 421-430 
    ISSN: 1434-601X
    Keywords: 24.60.Dr ; 23.40.Hc ; 21.10.Ma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The nuclear second moments, important inputs to pre-equilibrium reaction theories, are evaluated by assuming a simple model. The positive definite nature of the second moments is examined, and the nuclear level densities are calculated using positive definite second moments.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 330 (1988), S. 265-275 
    ISSN: 1434-601X
    Keywords: 24.60.Dr ; 23.40.Hc ; 21.10.Ma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Study of the nuclear second moments, important inputs to pre-equilibrium reaction theories, is extended to residual interactions of finite range. The interactions are assumed to have general spin and isospin dependence. The second moments are found to be always positive definite for commonly used values of the interaction parameters. They seem to support the strong coupling limit of the pre-equilibrium reaction theory by Nishioka et al. [1], which would imply the modification of the phenomenological model used in analyzing experimental data. As an application of the second moments, it is also investigated how the nuclear level densities change with the parameter values of the residual interaction. The results show the important role of the residual interaction especially in the low energy region, which may greatly improve the agreement with experimental data at thermal neutron resonances.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 333 (1989), S. 141-148 
    ISSN: 1434-601X
    Keywords: 24.60.Dr ; 23.40.Hc ; 21.10.Ma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effect of the realistic one-body spectrum is included in calculating the average partial level density, which has been so far obtained assuming degenerate one-body spectrum and GDE for the residual interaction. We show that such partial level densities are obtained by solving the extended saddle point equations which need inputs of the realistic one-body spectrum as well as the second moment of the ensemble. It is seen that the average partial level density is expressed in a convolution form of the partial level density for realistic one-body spectrum with the distribution which describes the effect by the random residual interaction. Calculations numerically performed show the improvement over the previous results. The effect of particle escape on the level density is also investigated and turns out to be practically negligible in precompound reactions.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 339 (1991), S. 129-139 
    ISSN: 1434-601X
    Keywords: 24.60.Dr ; 23.40.Hc ; 21.10.Ma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Level densities for fixedJ π and the exciton number are evaluated for closed shell nuclei40Ca and208Pb. The single particle spectra and wave functions are generated by Woods-Saxon potentials. The effects of the residual interaction are taken into account statistically by the method of generating function and Grassmann integral. The matrix elements for the residual interaction are assumed to be random variables with Gaussian distributions whose second moments are calculated by using a zero range interaction. The second moments are evaluated for fixedJ π by ignoring the Pauli principle between active nucleons and the spectator. This approximation is shown numerically to be very good. The partial level densities are calculated using the second moments as well as independent particle model spectra. The resulting level densities spread over wider energy ranges, have a smoother energy dependence and are enhanced at low energies compared with the independent particle model densities, although the total level densities do not differ by much.
    Type of Medium: Electronic Resource
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