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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Frequencies of charged secondaries numbers emitted from nucleon-nucleon and pion-nucleon inelastic collisions, observing multiplicity regularity
Cosmic gamma rays spectrum from neutral pions production and decay in metagalactic cosmic ray p-p collisions, deriving models based on Einstein general relativity theory
High energy negative kappa meson-nucleon interactions with respect to multiplicity distribution of charged pions in nucleon- antinucleon annihilation, showing binomial distribution
Negative pions elastic scattering from hydrogen, confirming differential cross section minimum for specific incident momentum-scattering angle region
Critical test of cosmological pion decay hypothesis for origin of isotropic gamma radiation above 1 MeV
Two-body strong interactions of elementary particles including kaons, pions, hyperons, and protons
Neutron and proton distributions rms radii in nuclei by optical model analysis of low energy pion-nucleus interactions
Cosmic gamma ray spectrum from secondary neutral pion production in p-p interactions, discussing delta isobar, fireball and nuclear interactions effects
High energy break in isotropic gamma ray spectrum predicted from critical test of cosmological pion-decay hypothesis
Nucleon spectra, particle multiplicities and radiochemical cross sections following stopped- pion absorptions by complex nuclei, comparing calculated and experimental data
Th 232 and U 238 pionic X ray energies and widths, suggesting anomalous effect for interaction between high-Z nuclei and pion
Galactic gamma rays from OSO-3 observations attributed to decay of neutral pions produced by cosmic rays interaction with interstellar gas nucleons
Nucleon-meson transport code NMTC to compute transport of nucleons below 3.5 GeV and muons and charged pions below 2.5 GeV
Negative pion proton elastic scattering differential cross sections from 1.71 to 5.53 GeV/c
Regular multiplicities of particle production in high energy collisions and antinucleon-nucleon annihilation, comparing cosmic ray jet data and pion-nucleon difference
During three balloon flights made in 1966 and 1967, cosmic electrons were investigated with the aid of a hodoscope detector which provided extensive and detailed information on each cosmic ray event triggering the apparatus. Similar information obtained during calibration exposures to protons and pions as well as to electrons was used to provide identification of cosmic electrons and to determine their energies. Differential primary electron intensities measured in the range from 1 GeV to 25 GeV were substantially larger than some earlier measurements. Taken in conjunction with existing measurements at energies above 100 GeV, this indicates that the energy spectrum of cosmic electrons is steeper than that of cosmic-ray nuclei and, consequently, suggests that Compton/synchrotron energy loss plays a significant role in shaping the electron spectrum.
A one dimensional shield optimization program based on the method of discrete ordinates has been developed and is used to determine material thicknesses used in asymmetric 4 pion shields for space power reactors. The two dimensional discrete ordinates program DOT is used to check the design, and the information generated in the DOT calculation is used as a guide in shaping the shield which may be considered a first step in two dimensional shield optimization.
Results obtained using a recently developed calculational method for determining the nucleon-meson cascade induced in thick materials by high-energy nucleons and charged pions are presented. The calculational method uses the intranuclear-cascade-evaporation model to treat nonelastic collisions by particles with energies approximately or smaller than GeV and an extrapolation model at higher energies. The following configurations are considered: (1) 19.2-GeV/c protons incident on iron; (2) 30.3-GeV/c protons incident on iron; (3) solar and galactic protons incident on the moon, and (4) galactic protons incident on tissue. For the first three configurations, experimental results are available and comparisons between the experimental and calculated results are given.