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Gamma rays from the de-excitation of C-12 resonance 15.11 MeV and C-12 resonance 4.44 MeV as probes of energetic particle spectraThe flux of 15.11 MeV gamma rays relative to the flux 4.44 MeV gamma rays was calculated from measured cross sections for excitation of the corresponding states of C-12 and from experimental determinations of the branching ratios for direct de-excitation of these states to the ground state. Because of the difference in threshold energies for excitation of these two levels, the relative intensities in the two lines are particularly sensitive to the spectral distribution of energetic particles which excite the corresponding nuclear levels. For both solar and cosmic emission, the observability of the 15.11 MeV line is expected to be enhances by low source-background continuum in this energy range.
Document ID
19770019117
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Crannell, C. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Crannell, H. (Catholic Univ. of Am. Greenbelt, MD, United States)
Ramaty, R. (NASA Goddard Space Flight Center)
Date Acquired
September 3, 2013
Publication Date
May 1, 1977
Subject Category
Space Radiation
Report/Patent Number
NASA-TM-X-71331
X-682-77-118
Meeting Information
Meeting: ESLAB Symp., Recent Advances in Gamma-Ray Astronomy
Location: Frascati
Country: Italy
Start Date: May 24, 1977
End Date: May 27, 1977
Accession Number
77N26061
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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