Butler, M. N. and Chu, M.-C. and Koonin, S. E. and Piekarewicz, J. (1988) Positron interactions with high-Z atoms at relativistic energies. Physical Review A, 38 (5). pp. 2274-2283. ISSN 0556-2791 http://resolver.caltech.edu/CaltechAUTHORS:BUTpra88
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Abstract
We consider the interaction of a positron with a bound electron of a high-Z atom. In particular, we present relativistic calculations of the cross sections for knockout and/or positronium formation in a thorium target, as well as an internal process in a hypothetical Z=164 "atom." Both plane-wave and distorted-wave Born approximations are discussed. We find peaks in the final sum energy of the electron-positron pairs due to the momentum distribution of the atomic electron. However, these peaks are too low in energy and are too broad compared with peaks claimed in e+e- scattering or with the anomalous positron peaks in heavy-ion experiments.
| Item Type: | Article |
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| Additional Information: | ©1988 The American Physical Society. Received 22 March 1988. We would like to thank Dr. V. Pönisch and Dr. A. Schäfer for useful discussions. One of us (M.-C.C.) thanks the Institut für Theoretische Physik der Universität Frankfurt for their hospitality and Dr. T. Elze for helpful discussions. Most of the numerical computation was done on the NSF/SDSC Cray X/MP computer; the assistance of the San Diego Supercomputer Center is appreciated. This work is supported partially by NSF Grant Nos. PHY-86-04197 and PHY-85-05682. One of us (M.N.B.) is grateful for financial support of the Natural Sciences and Engineering Research Council of Canada. |
| Record Number: | CaltechAUTHORS:BUTpra88 |
| Persistent URL: | http://resolver.caltech.edu/CaltechAUTHORS:BUTpra88 |
| Alternative URL: | http://dx.doi.org/10.1103/PhysRevA.38.2274 |
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
| ID Code: | 9959 |
| Collection: | CaltechAUTHORS |
| Deposited By: | Archive Administrator |
| Deposited On: | 28 Mar 2008 |
| Last Modified: | 26 Dec 2012 09:55 |
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