Apex and the e +/e − Puzzle: Recent Results

I Ahmad,A H Wuosmaa,M Wolanski,T Happ,J P Schiffer,D Mikolas,P Wilt,E Kashy,A L Hallin,J S Winfield,R W Dunford,F L H Wolfs,C Conner,B B Back,N I Kaloskamis,C J Lister,P Chowdhury,P.a.a Perera ,S J Freedman ,M Rhein ,M Liu ,A R Young ,D Mercer ,Sam M Austin ,A A Chishti ,Kevin C Chan ,S.b Gazes ,J D Fox ,R R Betts ,T A Trainor ,M.r Maier ,W Kutschera ,D Roa ,F Calaprice ,M Freer ,J Yurkon

doi:10.1007/978-1-4757-9086-3_42

Apex and the e +/e − Puzzle: Recent Results

I Ahmad, A H Wuosmaa + Show 34 more

https://doi.org/10.1007/978-1-4757-9086-3_42

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Publication Date: Jan 1, 1996

Affiliation: Argonne National Laboratory, Michigan State University, Queen's University, University of Rochester, University of Illinois at Chicago, Yale University, Princeton University, University of Chicago, Florida State University, University of Washington Applied Physics Laboratory, Seattle University, Lawrence Berkeley National Laboratory

#Heavy-ion Collision Systems #GSI UNILAC + Show 8 more

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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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