Nuclear Deexcitation Gamma Ray Lines from Accelerated Particle Interactions

Details Nuclear Deexcitation Gamma Ray Lines from Accelerated Particle Interactions Nuclear Deexcitation Gamma Ray Lines from Accelerated Particle Interactions

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19914604m&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #146.04; Bulletin of the American Astronomical Society, Vol. 33, p.1526

Astronomy and Astrophysics

Astrophysics

Scientific paper

Since the comprehensive treatment of nuclear deexcitation gamma-ray line emission by Ramaty, Kozlovsky and Lingenfelter in 1979, many new laboratory measurements of the cross sections have become available. Such new measurements allow improved theoretical evaluations of cross sections and the addition of more lines in the analyses of gamma-ray data. For example, the inclusion of lines produced by energetic 3He will provide unique information about its abundance. We present these improved cross sections as a function of the projectile energy for proton, alpha and 3He reactions with He, C, N, O, Ne, Mg, Al, Si, S, Ca and Fe. We also present calculations of gamma-ray line yields based on these cross sections and show how line ratios depend on the assumed ambient and accelerated-particle abundances and on the accelerated-particle energy spectrum. Such calculations are essential for interpretation of gamma-ray line observations of astrophysical sites that contain significant fluxes of energetic particles such as solar flares, the Earth's atmosphere, planetary atmospheres and surfaces, the interstellar medium and galactic nebulae. Part of the research reported here was supported by NASA DPR S92680F and W19977.

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