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  • 1
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    Advances in space radiation shielding codes (2002)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Early space radiation shield code development relied on Monte Carlo methods and made important contributions to the space program. Monte Carlo methods have resorted to restricted one-dimensional problems leading to imperfect representation of appropriate boundary conditions. Even so, intensive computational requirements resulted and shield evaluation was made near the end of the design process. Resolving shielding issues usually had a negative impact on the design. Improved spacecraft shield design requires early entry of radiation constraints into the design process to maximize performance and minimize costs. As a result, we have been investigating high-speed computational procedures to allow shield analysis from the preliminary concept to the final design. For the last few decades, we have pursued deterministic solutions of the Boltzmann equation allowing field mapping within the International Space Station (ISS) in tens of minutes using standard Finite Element Method (FEM) geometry common to engineering design methods. A single ray trace in such geometry requires 14 milliseconds and limits application of Monte Carlo methods to such engineering models. A potential means of improving the Monte Carlo efficiency in coupling to spacecraft geometry is given.
    Keywords: Aerospace Medicine
    Type: Journal of radiation research (ISSN 0449-3060); Volume 43 Suppl; S87-91
    Format: text
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  • 2
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    A letter of intent for an experiment to study strong electromagnetic fields at RHIC via multiple electromagnetic processes (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: An experimental program at the Relativistic Heavy Ion Collider (RHIC) which is designed to study nonperturbative aspects of electrodynamics is outlined. Additional possibilities for new studies of electrodynamics via multiple electromagnetic processes are also described.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Electromagnetic Processes in Nucleus-Nucleus Collisions Relating to Space Radiation Research; 31 p
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  • 3
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    An introduction to using the FORTRAN programs provided with Computational Nuclear Physics 1 Nuclear Structure (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The authors of this paper have provided a set of ready-to-run FORTRAN programs that should be useful in the field of theoretical nuclear physics. The purpose of this document is to provide a simple synopsis of the programs and their use. A separate section is devoted to each program set and includes: abstract; files; compiling, linking, and running; obtaining results; and a tutorial.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Electromagnetic Processes in Nucleus-Nucleus Collisions Relating to Space Radiation Research; 18 p
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  • 4
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    Stopping powers and cross sections due to two-photon processes in relativistic nucleus-nucleus collision (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The radiation dose received from high energy galactic cosmic rays (GCR) is a limiting factor in the design of long duration space flights and the building of lunar and martian habitats. It is of vital importance to have an accurate understanding of the interactions of GCR in order to assess the radiation environment that the astronauts will be exposed to. Although previous studies have concentrated on the strong interaction process in GCR, there are also very large effects due to electromagnetic (EM) interactions. In this report we describe our first efforts at understanding these EM production processes due to two-photon collisions. More specifically, we shall consider particle production processes in relativistic heavy ion collisions (RHICs) through two-photon exchange.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Electromagnetic Processes in Nucleus-Nucleus Collisions Relating to Space Radiation Research; 59 p
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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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    Electromagnetic interactions of cosmic rays with nuclei (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Parameterizations of single nucleon emission from the electromagnetic interactions of cosmic rays with nuclei are presented. These parameterizations are based upon the most accurate theoretical calculations available today. When coupled with Strong interaction parameterizations, they should be very suitable for use in cosmic ray propagation through intersteller space, the Earth's atmosphere, lunar samples, meteorites and spacecraft walls.
    Keywords: SPACE RADIATION
    Type: Photonuclear Absorption Cross Sections 22 p(SEE N89-29159 23-72); Photonuclear Absorpt
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  • 7
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    The invariance of classical electromagnetism under Charge-conjugation, Parity and Time-reversal (CPT) transformations (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The invariance of classical electromagnetism under charge-conjugation, parity, and time-reversal (CPT) is studied by considering the motion of a charged particle in electric and magnetic fields. Upon applying CPT transformations to various physical quantities and noting that the motion still behaves physically demonstrates invariance.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Photonuclear Absorption Cross Sections 14 p(SEE N89-29159 23-72); Photonuclear Absorpt
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  • 8
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    Nucleon emission via electromagnetic excitation in relativistic nucleus-nucleus collisions: Re-analysis of the Weizsacker-Williams method (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Previous analyses of the comparison of Weizsacker-Williams (WW) theory to experiment for nucleon emission via electromagnetic (EM) excitations in nucleus-nucleus collisions were not definitive because of different assumptions concerning the value of the minimum impact parameter. This situation is corrected by providing criteria that allows definitive statements to be made concerning agreement or disagreement between WW theory and experiment.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Photonuclear Absorption Cross Sections 24 p(SEE N89-29159 23-72); Photonuclear Absorpt
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  • 9
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    Electric quadrupole excitations in the interactions of Y-89 with relativistic nuclei (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The first complete calculations of electric quadrupole excitations in relativistic nucleus-nucleus collisions are presented herein. Neutron emission from Y-89 is studied and quadrupole effects are found to be a significant fraction of the cross section.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Washington State Univ., Photonuclear Absorption Cross Sections; 7 p
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  • 10
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    Electric quadrupole excitations in relativistic nucleus-nucleus collisions (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Calculations are presented for electric quadrupole excitations in relativistic nucleus-nucleus collisions. The theoretical results are compared to an extensive data set and it is found that electric quadrupole effects provide substantial corrections to cross sections, especially for heavier nuclei.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Photonuclear Absorption Cross Sections 16 p(SEE N89-29159 23-72); Photonuclear Absorpt
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