Portal:Radiation astronomy/Resource/14
Positrons
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"Positron astronomy is 30 years old but remains in its infancy."[1]
"[P]ositron astronomy results ... have been obtained using the INTEGRAL spectrometer SPI".[2] The positrons are not directly observed by the INTEGRAL space telescope, but "the 511 keV positron annihilation emission is".[2]
During solar flares “[s]everal radioactive nuclei that emit positrons are also produced; [which] slow down and annihilate in flight with the emission of two 511 keV photons or form positronium with the emission of either a three gamma continuum (each photon < 511 keV) or two 511 keV photons."[3]
References
[edit | edit source]- ↑ P.A.Milne; J.D.Kurfess; R.L.Kinzer; M.D.Leising; D.D.Dixon (April 2000). Investigations of positron annihilation radiation, In: Proceedings of the 5th COMPTON Symposium. 510. Washington, DC: American Institute of Physics. pp. 21-30. doi:10.1063/1.1303167. Bibcode: 2000AIPC..510...21M. http://arxiv.org/pdf/astro-ph/9911184. Retrieved 2011-11-25.
- ↑ 2.0 2.1 G. Weidenspointner; G.K. Skinner; P. Jean; J. Knödlseder; P. von Ballmoos; R. Diehl; A. Strong; B. Cordier et al. (October 2008). "Positron astronomy with SPI/INTEGRAL". New Astronomy Reviews 52 (7-10): 454-6. doi:10.1016/j.newar.2008.06.019. http://www.sciencedirect.com/science/article/pii/S1387647308001164. Retrieved 2011-11-25.