Cross sections relevant to gamma ray astronomy

Details Cross sections relevant to gamma ray astronomy Cross sections relevant to gamma ray astronomy

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978grsa.rept..498d&link_type=abstract

In NASA. Goddard Space Flight Center Gamma Ray Spectry. in Astrophys. p 498-501 (SEE N78-31971 22-88)

Astronomy and Astrophysics

Astronomy

Energy Spectra, Gamma Ray Astronomy, Line Spectra, Particle Collisions, Scattering Cross Sections, Carbon 12, Iron Isotopes, Magnesium Isotopes, Neon Isotopes, Nitrogen Isotopes, Oxygen Isotopes, Silicon Isotopes

Scientific paper

Gamma-ray production cross sections were measured for protons and alpha particles incident on targets consisting of nuclei of high cosmic abundance: C-12, N-14, O-16, Ne-20, Mg-24, Si-28 and Fe-56. Solid or gaseous targets were bombarded by monoenergetic beams of protons and alpha particles, and gamma rays were detected by two Ge(Li) detectors. The proton energy for each target was varied from threshold to about 24 MeV (lab); for alphas the range was from threshold to about 27 MeV. For most transitions, it was possible to measure the total cross section by placing the detectors at 30.5 deg and 109.9 deg where the fourth-order Legendre polynomial is zero. For the case of the 16O (Egamma = 6.13 MeV, multipolarity E3) cross sections, yields were measured at four angles. Absolute cross sections were obtained by integrating the beam current and by measuring target thicknesses and detector efficiencies. The Ge(Li) detector resolution was a few keV (although the peak widths were greater, due to Doppler broadening).

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