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Tuesday, August 4, 2020 | History

2 edition of Tables of nuclear cross sections for galactic cosmic rays found in the catalog.

Tables of nuclear cross sections for galactic cosmic rays

Lawrence W. Townsend

Tables of nuclear cross sections for galactic cosmic rays

absorption cross sections

by Lawrence W. Townsend

  • 7 Want to read
  • 40 Currently reading

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

    Subjects:
  • Galactic cosmic rays -- Tables.,
  • Absorption cross sections -- Tables.,
  • Space ships -- Shielding (Radiation) -- Tables.

  • Edition Notes

    Bibliography: p. 4-5.

    StatementLawrence W. Townsend and John W. Wilson.
    SeriesNASA reference publication ;, 1134
    ContributionsWilson, John W. 1940-
    Classifications
    LC ClassificationsQC485.9.G34 T67 1985
    The Physical Object
    Pagination30 p. :
    Number of Pages30
    ID Numbers
    Open LibraryOL2664685M
    LC Control Number85602175

    Cosmic rays are high-energy protons and atomic nuclei which move through space at nearly the speed of originate from the sun, from outside of the solar system, and from distant galaxies. Upon impact with the Earth's atmosphere, cosmic rays can produce showers of secondary particles that sometimes reach the from the Fermi Space Telescope () have been interpreted as. PROCEEDINGS OF THE 31st ICRC, ŁOD´ Z 1´ Secondary Positrons in Galactic Cosmic Rays Timur Delahaye∗, Roberto Lineros †, Julien Lavalle,Fiorenza Donato †, Nicolao Fornengo, Pierre Salati∗ ∗LAPTH, Universit´e de Savoie, CNRS, BP, F Annecy-le-Vieux Cedex, France †Dipartimento di Fisica Teorica, Universit`a di Torino Istituto Nazionale di Fisica Nucleare, via P.

    Although these tables are easily stored on disk or magnetic tape and accessed by the Tables of Nuclear Cross Sections for Galactic Cosmic Rays: Absorption Cross Sections. NASA RP , 3. L. W. TOWNSEND, J. W. WILSON, and J. W. NORBURY, A simplified optical model description of heavy of cosmic rays. Radiat. Res. 98, ( CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Cross-section predictions with semiempirical nuclear fragmentation models from the Langley Research Center and the Naval Research Laboratory are compared with experimental data for the breakup of relativistic iron and argon projectile nuclei in various targets. Both these models are commonly used to provide.

    the cross sections for many reactions validates the assumptions of the nuclear model. Table shows some of the many types of nuclear reactions and what they teach us about nuclei and nuclear energy. Table Nuclear Reaction Types Reaction What is Learned Nucleon - nucleon scattering Fundamental nuclear force Elastic scattering of nuclei. aims at highlighting the dependency of the cross section with energy, the data points correspond to different data species as marked in the legend. Beams at KVI used a primary beam of 30 MeV/n for Ne and 90 MeV/n for C, and as will be shown in detail in Section VI were degraded down to the energies reported in Table by:


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Tables of nuclear cross sections for galactic cosmic rays by Lawrence W. Townsend Download PDF EPUB FB2

In the present report, the nuclear inter- U(x) reduced potential, MeV 2 action theory is used to generate tables of nucleon, W(x) optical potential (defined in eq.

(4)), deuteron, and heavy-ion absorption cross sections for MeV incident energies of interest in cosmic ray shielding studies. Extensive tables of nucleon, deuteron, and heavy-ion absorption cross sections over a broad range of energies are generated for use in cosmic ray shielding studies.

Numerous comparisons of the calculated values with available experimental data show agreement to within 3 percent for energies above 80 MeV/nucleon and within approximately 10 percent for energies as low as 30 MeV/nucleon.

past and that the mean galactic cosmic ray (GCR) and solar cosmic ray (SCR) intensities, according to the traces in matter, remain approximately constant. At present, new models are developed that simulate more precisely all the processes.

The nuclear component of the primary cosmic rays comprises (at the top of the atmosphere) about 90% protons, 9% He, 1% heavier nuclei, and almost zero anti-nuclei. Comparing the distribution of elements in cosmic rays with the distribution throughout the.

Dose versus aluminum shielding thickness functions have been computed for the free space exposure. Galactic cosmic radiation is energetic and highly penetrating. 30 cm of aluminum shielding reduces the dose equivalent 25% to 40% (depending on the phase of the solar cycle).Cited by: – solar minimum period using observations from the Cosmic Ray Isotope Spectrometer (CRIS) onboard the Advanced Composition Explorer.

This period of time exhibited record-setting cosmic-ray intensities and very low levels of solar activity. Results are given for particles with nuclear charge 5 Z 28 in the energy range ∼50– MeV nucleon−1.

Several recent improvements have. In more detail, the material included in our code contains: 1) the nuclear reaction network, built using the Nuclear Data Sheets; 2) the isotopic cross section database built using the T16 Los Alamos compilation Mashnik et al., and the CEM2k and LAQGSM codes Mashnik et al., ; 3) fits to some particular channels of isotopic production.

partially excludes the lower energy galactic cosmic rays from the inner solar system. There is a significant anticorrelation between solar activity (which has an alternating eleven-year cycle) and the intensity of the cosmic rays with energies below about 10 Size: KB.

Cosmic ray spallation, also known as the x-process, is a set of naturally occurring nuclear reactions causing nucleosynthesis; it refers to the formation of chemical elements from the impact of cosmic rays on an object.

Cosmic rays are highly energetic charged particles from beyond Earth, ranging from protons, alpha particles, and nuclei of many heavier elements. Next, the selection deals with the motion of cosmic rays in the interstellar medium and the origin of cosmic rays. The text also talks about the quantitative galactic theory of the origin of cosmic rays.

The book will be of great use to astronomers, astrophysicists, and scientists who studies phenomena that involves celestial Edition: 1. Tables of nuclear cross sections for galactic cosmic rays: absorption cross sections. [Lawrence W Townsend; John W Wilson] -- A simple but comprehensive theory of nuclear reactions is presented.

Extensive tables of nucleon, deuteron, and heavy-ion absorption cross sections over a broad range of energies are generated for.

Extensive tables of nucleon, deuteron, and heavy-ion absorption cross sections over a broad range of energies are generated for use in cosmic ray shielding studies. Solar and galactic cosmic rays in the Earth’s atmosphere 0 10 h= g/cm2 h= g/cm2 CRII [cm-3 sec-1] I [MV], P C =0, P C =5 GV, P C =15 GV Fig.

CRII as a function of the modulation potential φ for different locations and altitudes (computations by. Galactic cosmic rays &gamma rays: a synthesis Andrew W.

Strong and Igor V. Moskalenko1 MPIfu¨rextraterrestrische Physik,D– Garching, Germany Abstract. We have developed a model which aims to reproduce obser-vational data of many kinds related to cosmic-ray origin and propaga. Inclusive cross-section. The inclusive cross-section results when only specified particles are measured.

An inclusive reaction is typically denoted as (1) P + T → F + X, where the projectile P and the target T make up the initial state. The final state consists of the measured projectile fragment F and the outgoing particles X, which may or may not be by: Single Event Effects.

A single event effect (SEE) results from, as the term suggests, a single, energetic particle. The possibility of single-event upsets was first postulated by Wallmark and Marcus in [1] The first actual satellite anomalies were reported by Binder et al.

in [2] Some of the early pioneering work was by May and Woods, who investigated alpha-particle-induced soft. Over recent years there has been marked growth in interest in the study of techniques of cosmic ray physics by astrophysicists and particle physicists.

Cosmic radiation is important for the astrophysicist because in the farther reaches of the universe. For particle physicists, it provides the opportunity to study neutrinos and very high energy particles of galactic origin/5(2). 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. The most commonly used toy model for galactic cosmic rays is called the "leaky box" model. It assumes that the cosmic rays are con ned within the galactic disk, where the mass density is high, but with some gradual leaking out of the disk.

The con ning force is the galactic magnetic eld, which is on the order of 10 7 Gauss. A relativistic File Size: 1MB. Abstract.

Galactic cosmic rays represent a directly accessible sample of matter that originates outside the solar system. The elemental and isotopic composition of this sample of high-energy matter contains a record of nucleosynthesis in other regions of the galaxy, and of subsequent nuclear and electromagnetic interactions that have altered its composition.

Galactic cosmic radiation, GCR, refers to sources of radiation in the form of high-energy particles originating outside the solar system. GCR are high-energy nuclei from which all of the surrounding electrons have been stripped away during their high-speed passage through the galaxy.To better understand the early galactic production of Li, Be, and B by cosmic ray spallation and fusion reactions, the dependence of these production rates on cosmic ray models and model parameters is examined.

The sensitivity of elemental and isotropic production to the cosmic ray pathlength magnitude and energy dependence, source spectrum spallation kinematics, and cross section Author: Brian D.

Fields, Keith A. Olive, David N. Schramm.neutrons produced by nuclear interactions of primary Galactic Cosmic Rays impacting on atmospheric atoms: this is the well known CRAND mechanism still invoked as one of the continuous but low intensity source of the most energetic protons populating the inner radiation belt (CRAND stands for “Cosmic Ray Albedo Neutron Decay”).