First observation of beam-induced positrons in APEX
- Argonne National Laboratory, IL (United States)
We have performed the first beam measurements of positrons and positron-electron coincidences from heavy-ion collisions using the APEX positron spectrometer at Argonne National Laboratory. A 3 - 4 pnA beam of 6.0 MeV/nucleon {sup 238}U, produced by the ATLAS accelerator, was used to bombard a 1 mg/cm{sup 2} Ta target. Positrons and coincident electrons produced in these collisions were detected using one of the two 216-element silicon detector arrays. We obtained a data set consisting of approximately 10{sup 5} positron singles events and 12000 non back-to-back e{sup +}-e{sup -} coincidence events. The in-beam performance of the spectrometer, as well as an analysis of the positron singles and positron-electron coincidence data, will be discussed.
- OSTI ID:
- 386993
- Report Number(s):
- CONF-931044-; ISSN 0003-0503; TRN: 96:026931
- Journal Information:
- Bulletin of the American Physical Society, Vol. 38, Issue 9; Conference: Fall meeting of the Division of Nuclear Physics of the American Physical Society, Pacific Grove, CA (United States), 20-23 Oct 1993; Other Information: PBD: Oct 1993
- Country of Publication:
- United States
- Language:
- English
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