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Positron annihilation in solar flares
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Ramaty, R. Crannell, C. J. Werntz, C. |
| Copyright Year | 1975 |
| Description | The gamma ray line at 0.51 MeV originates from the annihilation of positrons. When a fraction of the positrons annihilate from bound states of positronium, the 0.51-MeV line is accompanied by a continuum of 3-gamma annihilation radiation at energies up to 0.51 MeV. Accurate calculations of the rates of free annihilation and positronium formation in a solar flare plasma are presented and positronium formation by charge exchange is discussed. The observability of the 3-gamma annihilation is increased by the inherent delay in the production and slowing down time of the positrons. It was concluded that such radiation could be detected at times late in solar gamma ray events when the continuum and prompt line emissions have essentially disappeared. |
| File Size | 847653 |
| Page Count | 14 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19750020921 |
| Archival Resource Key | ark:/13960/t0tr0pg68 |
| Language | English |
| Publisher Date | 1975-07-01 |
| Access Restriction | Open |
| Subject Keyword | Solar Physics Gamma Rays Charge Exchange Positron Annihilation Solar Flares Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
