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Tuesday, May 12, 2020 | History

2 edition of Optical-model abrasion cross sections for high-energy heavy ions found in the catalog.

Optical-model abrasion cross sections for high-energy heavy ions

Lawrence W. Townsend

Optical-model abrasion cross sections for high-energy heavy ions

by Lawrence W. Townsend

  • 150 Want to read
  • 22 Currently reading

Published by National Aeronautics and Space Administration, Scientific and Technical Information Branch, For sale by the National Technical Information Service] in Washington, D.C, [Springfield, Va .
Written in English

    Subjects:
  • Collisions (Nuclear physics),
  • Scattering (Physics)

  • Edition Notes

    StatementLawrence W. Townsend.
    SeriesNASA technical paper -- 1893.
    ContributionsUnited States. National Aeronautics and Space Administration. Scientific and Technical Information Branch., Langley Research Center.
    The Physical Object
    Pagination15 p. :
    Number of Pages15
    ID Numbers
    Open LibraryOL17827305M

    @article{osti_, title = {Optical model for the energy distribution of secondary electrons}, author = {Kim, Y K}, abstractNote = {BS>In Radiological and Environmental Research Division annual report: radiation physics, July June A striking similarity between the experimental data on the production of secondary electrons by electron impact and the photoionization cross section. Optical-model abrasion cross sections for high-energy heavy ions / (Washington, D.C.: National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va.: For sale by the National Technical Information Service], ), by Lawrence W. Townsend, Langley Research Center, and United States.

    Using an abrasion-ablation collision model, which includes contributions from frictional-spectator interactions and electromagnetic dissociation, analyses of the sensitivities of predicted fragmentation cross sections to the choice of a particular abrasion formalism are made using both geometric and optical potential abrasion by: Optical model analyses of heavy ion fragmentation in hydrogen targets Lawrence W. Townsend NASA Langley Research Center, Hampton, Virginia (Received 31 January ) Quantum-mechanical optical-model methods for calculating cross sections for the fragmentation of high-energy heavy ions by hydrogen targets are presented.

    Transport Methods and Interactions for Space Radiations. Authors; Authors and affiliations An abrasion optical model is derived that agrees well with experiment if the two-body interaction matrix is properly symmetrized. Optical-Model Abrasion Cross Sections for High-Energy Heavy Ions. NASA TP Google Scholar. Townsend, Lawrence W Cited by:   In this volume, the following topics are discussed: study of intermediate and low energy heavy ion collisions, nuclear structure at high spin, nuclei far from stability, radioactive ion beam physics and development of experimental facilities.


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Optical-model abrasion cross sections for high-energy heavy ions by Lawrence W. Townsend Download PDF EPUB FB2

Cross section for abrading all projectile nucleons in one collision, from equa- tion (1 21, is less than 5 nanobarns’ - approximately a million times smaller than for the Be target. As target size increases, the abrasion cross sections increase as m increases.

This results from the larger geometric area for. Optical-model abrasion cross sections for high-energy heavy ions. Washington, D.C.: National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va.: For sale by the National Technical Information Service], (OCoLC) Material Type: Government publication, National government publication.

Abstract Within the context of eikonal scattering theory, a generalized optical model potential approximation to the nucleus-nucleus multiple scattering series is used in an abrasion-ablation collision model to predict abrasion cross sections for relativistic projectile heavy ions.

Quantum mechanical optical potential methods for calculating inclusive isotope and element production cross sections from the fragmenting of heavy nuclei by intermediate-and high-energy protons and heavy ions are presented based upon a modified abrasion–ablation-FSI (frictional spectator interaction) collision by: The fragmentation of target nuclei by relativistic protons and heavy ions is described within the context of a simple abrasion-ablation-final-state interaction model.

Abstract The fragmentation of high-energy galactic heavy ions by nuclear interactions with arbitrary target nuclei is described within the context of a simple abrasion-ablation fragmentation model.

The abrasion part of the theory utilizes a quantum-mechanical formalism based upon an optical model potential approximation to the exact nucleus. Quantum mechanical optical potential methods for calculating inclusive isotope and element production cross sections from the fragmenting of heavy nuclei by intermediate-and high-energy protons and heavy ions are presented based upon a modified abrasion-ablation-FSI (frictional spectator interaction) collision model.

Abstract Two different abrasion formalisms, one based on an energy-independent geometric model and the other based on a quantum-mechanical optical model, are shown to yield comparable fragmentation cross section predictions when used as input to an abrasion-ablation frictional-spectator interaction fragmentation calculation which includes electromagnetic.

The fragmenting of high energy, heavy ions by hydrogen targets is an important physical process in several areas of space radiation protection research. Quantum mechanical, optical model methods for calculating cross sections for particle fragmentation by hydrogen have been developed from a modified abrasion-ablation collision : L.W.

Townsend, R.K. Tripathi, F.A. Cucinotta, R. Bagga. We also calculated the cross sections for the production of residual nuclides by high-energy heavy ions by the particle and heavy-ion transport code system (PHITS) code and compared with measured.

L.W. Townsend, Optical-Model Abrasion Cross Sections for High-Energy Heavy Ions, NASA TP (). [7] L.W. Townsend, Harmonic Well Matter Densities and Pauli Correlation Effects in Heavy-Ion Collisions, NASA TP ().Cited by: Within the context of a double-folding optical potential approximation to the exact nucleus-nucleus multiple-scattering series, eikonal scattering theory is used to generate tables of heavy ion.

The fragmentation of high-energy galactic heavy ions by nuclear interactions with arbitrary target nuclei is described within the context of a simple abrasion-ablation fragmentation model.

The two-step classical abrasionablation model of Bowman et al. () was an extension of earlier models of direct interaction followed by intra-nuclear cascade/evaporation used to describe high energy nucleon induced reactions.

Heavy ion reactions are clearly distinct from nucleon induced ones due to the large overlap between the projectiletarget leading to much larger cross sections Cited by: An abrasion-ablation T-matrix formulation is applied to the calculation of double differential-cross sections in projectile fragmentation of GeV/nucleon O.

Abstract. Quantum mechanical optical potential methods for calculating inclusive isotope and element production cross sections from the fragmenting of heavy nuclei by intermediate- and high-energy protons and heavy ions are presented based upon a modified abrasion-ablation-FSI (frictional spectator interaction) collision model.

The current uncertainties in nuclear cross sections will not allow the composition of the shield material to be distinguished in order to minimize biological risk.

An overview of the development of quantum mechanical models of heavy ion reactions will be given and computational results compared with by: 9. Theoretical methods for estimating high-energy, heavy-ion (HZE) particle absorption and fragmentation cross-sections are described and compared with available experimental data.

Differences between theory and experiment range from several percent for absorption cross-sections up to about 25%–50% for fragmentation by: 1. Using the formalism described in the previous sections, total and absorption cross sections for selected heavy ions with various target nuclei have been calcu- lated.

The results are given in tables 2 to The projectile and target nuclei. [Abrasion-ablation model, cross sections, fireball and firestreak models] Technical Report Seixas de Oliveira, L F The abrasion-ablation model is briefly described and then used to calculate cross sections for production of large fragments resulting from target or projectile fragmentation in high-energy heavy-ion collisions.

In this paper we describe methods for compiling a data-base of energy dependent pion-heavy ion inelastic sections for interactions of pions with common shielding and tissue atoms over a wide energy range (20 MeV to GeV).Author: Francis A.

Cucinotta, Myung-Hee Y. Kim, Premkumar B. Saganti.The differential cross-sections for elastic scattering were normalized to the differential cross-section of Rutherford scattering, and are plotted as a function of scattering angle.

The elastic scattering angular distributions for 9 Be + Pb at the energy = 88 MeV, and for 10 Be + Pb at the energy = MeV, are shown in Fig.

: Fang-Fang Duan, Fang-Fang Duan, Yan-Yun Yang, Dan-Yang Pang, Bi-Tao Hu, Jian-Song Wang, Kang Wang, G. Heavy-ion total reaction cross-section measurements for more than reaction cases covering 61 target nuclei in the range 6 Li – U and projectile nuclei from 2 H to 84 Kr (mostly exotic ones) have been analyzed in a systematic way by using an empirical, three-parameter formula that is applicable to the cases of projectile kinetic energies above the Cited by: 1.