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X-ray and gamma-ray line production by nonthermal ions
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Bussard, R. W. Ramaty, R. Omidvar, K. |
| Copyright Year | 1977 |
| Description | X-ray production was calculated at approximately 6.8 keV by the 2p to 1s transition in fast hydrogen- and helium-like iron ions, following both electron capture to excited levels and collisional excitation. A refinement of the OBK approximation was used to obtain an improved charge exchange cross section. This, and the corresponding ionization cross section were used to determine equilibrium charge fractions for iron ions as functions of their energy. The effective X-ray line production cross section was found to be sharply peaked in energy at about 8 to 12 MeV/amu. Because fast ions of similar energies can also excite nuclear levels, the ratio of selected strong gamma ray line emissivities to the X-ray line emissivity was also calculated. Limits set by this method on the intensity of gamma ray line emission from the galactic center and the radio galaxy Centaurus A are generally lower than those reported in the literature. |
| File Size | 3501111 |
| Page Count | 37 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19770020117 |
| Archival Resource Key | ark:/13960/t2d84423b |
| Language | English |
| Publisher Date | 1977-06-01 |
| Access Restriction | Open |
| Subject Keyword | Space Radiation Gamma Rays Spectral Energy Distribution Iron X Ray Spectra Line Spectra Radio Sources Astronomy Ionization Cross Sections Centaurus Constellation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
