Anomalous Positron Peaks from Supercritical Collision Systems
- 22 April 1985
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 54 (16), 1761-1764
- https://doi.org/10.1103/physrevlett.54.1761
Abstract
Narrow positron peaks are observed in five supercritical collision systems with combined nuclear charge . The peaks do not originate from nuclear internal pair conversion and their production appears to occur in a narrow projectile-energy interval near the Coulomb barrier. The line shapes are consistent with emission by a source moving with the c.m. velocity. Particularly notable is an apparent independence of the peak energies on . These observations are discussed in the context of the spontaneous decay of the QED vacuum and other new potential sources of line positron spectra.
Keywords
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