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  • 1
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    Deformed Brueckner-Hartree-Fock calculations. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The renormalized Brueckner-Hartree-Fock (RBHF) theory for many-body nuclear systems has been generalized to permit calculations for intrinsic states having permanent deformation. Both Hartree-Fock and Brueckner self-consistencies are satisfied, and details of the numerical techniques are discussed. The Hamada-Johnston interaction is used in a study of deformations, binding, size, and separation energies for several nuclei. Electromagnetic transition rates, moments, and electron scattering form factors are calculated using nuclear wave functions obtained by angular momentum projection. Comparison is made to experiment as well as to predictions of ordinary and density-dependent Hartree-Fock theory.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Symposium on Present Status and Novel Developments in the Many-Body Problem; Sept. 19-23, 1972; Rome; Italy
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Short-range correlations in carbon-12, oxygen-16, and neon-20: Intrinsic properties (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The Brueckner-Hartree-Fock (BHF) method has been applied to nuclei whose intrinsic structure is nonspherical. Reaction matrix elements were calculated as functions of starting energy for the Hamada-Johnston interaction using the Pauli operator appropriate to O-16 and a shifted oscillator spectrum for virtual excited states. Binding energies, single particle energies, radii, and shape deformations of the intrinsic state, in ordinary as well as renormalized BHF, are discussed and compared with previous HF studies and with experiment when possible. Results are presented for C-12, 0-16 and Ne-20. It is found that the binding energies and radii are too small, but that separation energies are well reproduced when the renormalized theory is used.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-TN-D-6834 , E-6836
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Acoustic source location in a jet-blown flap using a cross-correlation technique (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The acoustic source strength distribution in a turbulent flow field was measured for two far field microphones at 45 deg above and below the plane of the flap surface. A processed signal from an inclined hot-film anemometry probe was cross correlated with the signal from the appropriate far field microphone. The contribution made by the sources associated with the fluctuating pressure on the flap surface to the sound received at far field microphone was estimated by cross correlating the processed signals of microphones which were embedded in the flap surface with the far field microphone signals. In addition, detailed fluid dynamic measurements were made in the flow field of the jet flap using dual sensor hot-film anemometry probes.
    Keywords: ACOUSTICS
    Type: NASA-CR-149589
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Deformed Brueckner-Hartree-Fock calculations (1972)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The renormalized Brueckner-Hartree-Fock (RBHF) theory for many-body nuclear systems is generalized to permit calculations for intrinsic states having permanent deformation. Both Hartree-Fock and Brueckner self-consistencies are satisfied, and details of the numerical techniques are discussed. The Hamada-Johnston interaction is used in a study of deformations, binding, size, and separation energies for several nuclei. Electromagnetic transition rates, moments, and electron scattering form factors are calculated using nuclear wave functions obtained by angular momentum projection. Comparison is made to experiment as well as to predictions of ordinary and density-dependent Hartree-Fock Theory.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-TM-X-68134 , Symp. on Present Status and Novel Develop. in the Many Body Probl.; Sep 19, 1972 - Sep 23, 1972; Rome
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Deformed Brueckner-Hartree-Fock calculation for light nuclei (1971)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: For the first time the Brueckner-Hartree-Fock (BHF) method was applied to nuclei whose intrinsic structure is nonspherical. One aim was to investigate whether the energy dependent reaction matrix calculated from a realistic nucleon-nucleon interaction leads to deformations similar to, or different from, those obtained from energy independent interactions in Hartree-Fock (HF) calculations. Reaction matrix elements were calculated as a function of starting energy for the Hamada-Johnston interaction, using a Pauli operator appropriate to O-16 and a shifted oscillator spectrum for virtual excited states. Binding energies, single-particle energies, radii, and shape deformations of the intrinsic state in unrenormalized as well as renormalized BHF are discussed and compared with previous HF studies. Results are presented for C-12, O-16, and Ne-20.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: NASA-TM-X-67972 , E-5503 , Am. Phys. Soc. Meeting; Nov 04, 1971 - Nov 06, 1971; Tucson, AZ; United States
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  • 6
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    Acoustic source location in the secondary mixing region of a jet-blown flap using a cross-correlation technique (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An experimental investigation of the acoustic sources in the secondary mixing region of a laboratory-scale jet-flap was made using a causality correlation technique. The processed signal of a hot-film anemometer probe was cross correlated with the output signal of a far-field microphone. Axial acoustic source strength distributions were measured for three far-field microphone locations: plus or minus 45 deg in the flyover plane and 45 deg in the sideline plane. These measurements showed that the acoustic sources in the secondary mixing region are highly directional, radiating much more effectively to the -45 deg-microphone, located below the plane of the flap surface. A relative maximum in the acoustic source strength measured for the microphones in the flyover plane occurred very near the flap trailing edge, which may be due to an edge amplification effect predicted by the theoretical work of Ffowcs Williams and Hall.
    Keywords: ACOUSTICS
    Type: AIAA PAPER 77-1364 , Aeroacoustics Conference; Oct 03, 1977 - Oct 05, 1977; Atlanta, GA
    Format: text
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