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  • 1
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    Energy-dependent parameterization of heavy-ion absorption cross sections (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An energy-dependent parameterization of the total absorption (reaction) cross sections for heavy ion (Z equal to or greater than 2) collisions at energies above 25 MeV per nucleon is presented. The formula will be especially useful in heavy-ion transport applications.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Radiation Research (ISSN 0033-7587); 106; 283-287
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  • 2
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    Multiple scattering of heavy ions, Glauber theory, and optical model (1974)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: An exact multiple-scattering series for the scattering of two heavy ions is derived and compared to the Glauber approximation. An optical model potential operator is indicated which is an accurate approximation to the multiple-scattering formalism.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Physics Letters; 52B; Sept. 30
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  • 3
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    Mean excitation energy for molecules of hydrogen and carbon (1981)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The Gordon-Kim electron gas model of molecular bonding is used to calculate correction factors for the Bragg rule for molecules of hydrogen and carbon. General rules for molecular mean excitation energies are obtained that agree to about 4% with experimental values.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Physics Letters; 85A; Sept. 7
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  • 4
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    Metallic bond effects on mean excitation energies for stopping powers (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Mean excitation energies for first row metals are evaluated by means of the local plasma approximation. Particle corrections based on Pines' (1953) procedure and the Wigner Seitz (1934) model of the metallic state are included. The agreement with experimental values is remarkably good. In contrast to previous work, the calculations given here estimate shifts in the plasma frequency according to the theory for plane wave states in an extended plasma as calculated by Pines. It is demonstrated that the effects of the metallic bond in lithium and beryllium are quite large and that they appear mainly as a result of collective oscillations in the 'free' electron gas formed from the valence electrons. The usefulness of the plasma frequency shift derived for a degenerate electron gas in predicting the plasma frequency shift within the ion core is considered surprising.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Physics Letters; 90A; July 12
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  • 5
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    An optical model description of momentum transfer in heavy ion collisions (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: An optical model description of momentum transfer in relativistic heavy ion collisions, based upon composite particle multiple scattering theory, is presented. The imaginary component of the complex momentum transfer, which comes from the absorptive part of the optical potential, is identified as the longitudinal momentum downshift of the projectile. Predictions of fragment momentum distribution observables are made and compared with experimental data. Use of the model as a tool for estimating collision impact parameters is discussed.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Washington State Univ., Photonuclear Absorption Cross Sections; 21 p
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  • 6
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    HZE beam transport in multilayered materials (1995)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A nonperturbative analytic solution of the high charge and energy (HZE) Green's function is used to implement a computer code for laboratory ion beam transport in multiple-layered materials. The code is established to operate on the Langley nuclear fragmentation model used in space engineering applications. Computational procedures are established to generate linear energy transfer (LET) distributions for a specified ion beam and target for comparison with experimental measurement. Comparison with Fe-56 ion with Pb-Al and Pb-(CH2)(x) targets shows reasonable agreement.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: San Francisco Univ., High LET, Passive Space Radiation Dosimetry and Spectrometry; 9 p
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  • 7
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    Intermediate energy proton stopping power for hydrogen molecules and monoatomic helium gas (1984)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Stopping power in the intermediate energy region (100 keV to 1 MeV) was investigated, based on the work of Lindhard and Winther, and on the local plasma model. The theory is applied to calculate stopping power of hydrogen molecules and helium gas for protons of energy ranging from 100 keV to 2.5 MeV. Agreement with the experimental data is found to be within 10 percent.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Old Dominion Univ. A Study of Phys. Processes for Space Radiation Protection; 11 p
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  • 8
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    Low-energy proton stopping power of N2, O2 and water vapor and deviations from Bragg's rule (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A modified local plasma model, based on the works of Lindhard and Winther; and Bethe, Brown, and Walske, is established. The Gordon-Kim model for molecular electron density is used to calculate stopping power of N2, O2, and water vapor for protons of energy ranging from 40 keV to 2.5 MeV, resulting in good agreement with experimental data. Deviations from Bragg's rule are evaluated and are discussed under the present theoretical model.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Old Dominion Univ. A Study of Phys. Processes for Space Radiation Protection; 16 p
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  • 9
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    Progress in proton transport code development: Microelectronic application (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The process of target nucleus fragmentation by energetic protons is examined, and their effects on microelectronic devices are considered. A formalism for target fragment transport is presented. Future applications to microelectronic effects are discussed.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Alabama A & M Univ., NASA-HBCU Space Science and Engineering Research Forum Proceedings; p 371-38
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  • 10
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    Theoretical antideuteron-nucleus absorptive cross sections (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Antideuteron-nucleus absorptive cross sections for intermediate to high energies are calculated using an ion-ion optical model. Good agreement with experiment (within 15 percent) is obtained in this same model for (bar p)-nucleus cross sections at laboratory energies up to 15 GeV. We describe a technique for estimating antinucleus-nucleus cross sections from NN data and suggest that further cosmic ray studies to search for antideuterons and other antinuclei be undertaken.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Hampton Univ., Scattering Calculations and Confining Interactions; 5 p
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