Phys. Rev. C 60, 064601 (1999) [14 pages]
Positron-electron pairs produced in heavy-ion collisions
I. Ahmad et al.
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I. Ahmad1, Sam. M. Austin2, B. B. Back1, R. R. Betts1,3, F. P. Calaprice4, K. C. Chan5, A. Chishti6, C. M. Conner3, R. W. Dunford1, J. D. Fox6 *, S. J. Freedman1,7, M. Freer1,8, S. B. Gazes9,10, A. L. Hallin11, Th. Happ1,12, D. Henderson1, N. I. Kaloskamis5 †, E. Kashy2, W. Kutschera1, J. Last1, C. J. Lister1, M. Liu11, M. R. Maier8, D. M. Mercer2, D. Mikolas2, P. A. A. Perera9, M. D. Rhein1,12, D. E. Roa6 ‡, J. P. Schiffer1,10, T. A. Trainor13, P. Wilt1, J. S. Winfield2 §, M. Wolanski1,10 **, F. L. H. Wolfs9, A. H. Wuosmaa1, A. R. Young4, and J. E. Yurkon2
1Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
2NSCL and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824
3Physics Department, University of Illinois at Chicago, Chicago, Illinois 60607
4Physics Department, Princeton University, Princeton, New Jersey 08544
5A. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511
6Physics Department, Florida State University, Tallahassee, Florida 32306
7Lawrence Berkeley Laboratory, Berkeley, California 94720
8School of Physics and Space Research, University of Birmingham, P. O. Box 363, Birmingham B15 2TT, England
9Nuclear Science Research Laboratory, University of Rochester, Rochester, New York 14627
10Department of Physics, University of Chicago, Chicago, Illinois 60637
11Physics Department, Queen’s University, Kingston, Ontario, Canada K7L 3N6
12Gesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, Germany
13Nuclear Physics Laboratory, University of Washington, Seattle, Washington 98195
Received 25 November 1998; published 26 October 1999
The production of positron-electron pairs in collisions of 238U+232Th at 5.95 MeV/nucleon, and of 238U+181Ta at 5.95, 6.1, and 6.3 MeV/nucleon, has been studied with the APEX spectrometer at Argonne National Laboratory. Several analyses have been performed to search for sharp structures in sum-energy spectra for positron-electron pairs. Such features have been reported in previous experiments. No statistically convincing evidence for such behavior is observed in the present data.
©1999 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevC.60.064601
DOI: 10.1103/PhysRevC.60.064601
PACS: 25.70.Bc, 14.80.-j
* Present address: Physics Division Oak Ridge National Laboratory P. O. Box 2008, Oak Ridge, TN 37831.
† Present address: Institute of Accelerating Systems and Applications, P.O. Box 17214, Athens 10024, Greece.
‡ Present address: Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439.
§ Present address: Department of Physics, University of Surrey, Guildford, Surrey U2 6RW, U.K.
** Present address: Indiana University Cyclotron Facility, Bloomington, IN 47401.
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