Abstract
Narrow structures first reported in positron singles energy spectra [1, 2, 3, 4, 5, 6, 7] and later in electron-positron energy distributions [5, 8, 9, 10, 11, 12] associated with collisions of very heavy ions near the Coulomb barrier have been an outstanding puzzle in nuclear physics for nearly fifteen years. In a series of positron and positron/electron experiments by three different groups (EPOS, ORANGE and TORI) ([5] and citations therein) at the GSI UNILAC at Darmstadt, Germany narrow structures (‘lines’) were observed by EPOS and ORANGE for several heavy-ion collision systems, with some features such as the line energies and widths having apparently similar values for the different collision systems.
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Ahmad, I. et al. (1996). Apex and the e +/e − Puzzle: Recent Results. In: Bauer, W., Westfall, G.D. (eds) Advances in Nuclear Dynamics 2. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9086-3_42
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DOI: https://doi.org/10.1007/978-1-4757-9086-3_42
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