Nuclide production by primary cosmic-ray protons

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The production rates of cosmogenic nuclides in the solar system and in interstellar space were calculated for the primary protons in the galactic and solar cosmic rays. At 1 AU, the long-term average fluxes of solar protons usually produce many more atoms of a cosmogenic nuclide than the primary protons in the galactic cosmic rays (GCR), the exceptions being nuclides made only by high-energy reactions (like /sup 10/Be). Because the particle fluxes inside meteorites and other large objects in space include many secondary neutrons, the production rates are much higher and ratios inside large objects are often very different from ... continued below

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Pages: 18

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Reedy, R.C. January 1, 1986.

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The production rates of cosmogenic nuclides in the solar system and in interstellar space were calculated for the primary protons in the galactic and solar cosmic rays. At 1 AU, the long-term average fluxes of solar protons usually produce many more atoms of a cosmogenic nuclide than the primary protons in the galactic cosmic rays (GCR), the exceptions being nuclides made only by high-energy reactions (like /sup 10/Be). Because the particle fluxes inside meteorites and other large objects in space include many secondary neutrons, the production rates are much higher and ratios inside large objects are often very different from those by just the primary GCR protons in small objects. The production rates of cosmogenic nuclides are calculated to vary by about factors of 2.5 during at typical 11-year solar cycle, in agreement with measurements of short-lived radionuclides in recently fallen meteorites. The production of cosmogenic nuclides by the GCR particles outside the heliosphere is higher than that by the modulated GCR primaries normally in the solar system. However, there is considerable uncertainty in the fluxes of interstellar protons and, therefore, in the production rates of cosmogenic nuclides in interstellar space. Production rates and ratios for cosmogenic nuclides would be able to identify particles that were small in space or that were exposed to an unmodulated spectrum of GCR particles. 25 refs., 2 figs., 2 tabs.

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Pages: 18

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NTIS, PC A02/MF A01.

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  • Lunar and planetary science conference, Houston, TX, USA, 17 Mar 1986

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  • Other: DE86011268
  • Report No.: LA-UR-86-1524
  • Report No.: CONF-860375-2
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5631144
  • Archival Resource Key: ark:/67531/metadc1092948

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1986

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  • Feb. 10, 2018, 10:06 p.m.

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  • May 30, 2018, 12:19 p.m.

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Reedy, R.C. Nuclide production by primary cosmic-ray protons, article, January 1, 1986; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1092948/: accessed June 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.