One-photon annihilation of Lorentzian positrons in the interstellar medium
- Title
- One-photon annihilation of Lorentzian positrons in the interstellar medium
- Author
- 정영대
- Keywords
- atomic processes; elementary particles; ISM : general
- Issue Date
- 2007-03
- Publisher
- UNIV CHICAGO PRESS
- Citation
- ASTROPHYSICAL JOURNAL, v. 657, NO. 2, Page. 805.0-809.0
- Abstract
- We investigate one-photon annihilation of Lorentzian positrons with bound atomic electrons in the interstellar medium. The K and higher shell contributions, using the effective nuclear charges, are included to evaluate the annihilation rate of Lorentzian positrons. The results show that the one-photon positron annihilation rate increases with increasing positron temperature (T) over bar (+) (=T+/ryd), and decreases with increasing spectral index (kappa) for both the K and higher shell electrons. In addition, we find that positron annihilation rates for K-shell electrons are much larger than for higher shell electrons. At the intermediate positron temperature (T) over bar (+) = 1, the K-shell electrons of Si and C atoms produce the largest annihilation rates when kappa = 2 and 6, respectively. However, at the high temperature (T) over bar (+) = 10, the K-shell electrons of Si and Mg atoms provide the largest annihilation rates for kappa = 2 and 6. Hence, the annihilation rate is quite sensitive to the Lorentzian character of the positron distribution.
- URI
- https://iopscience.iop.org/article/10.1086/511145https://repository.hanyang.ac.kr/handle/20.500.11754/182193
- ISSN
- 0004-637X;1538-4357
- DOI
- 10.1086/511145
- Appears in Collections:
- COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > APPLIED PHYSICS(응용물리학과) > Articles
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