Double quantum jumps and searches for electron-positron peaks-some recent results from ATLAS

Journal Article · Wed May 01 04:00:00 EDT 1996 · Bulletin of the American Physical Society

OSTI ID:394235

Dunford, R W ^[1]

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1. Argonne National Lab., IL (United States)

Results of some recent experiments at Argonne`s ATLAS accelerator will be presented, including studies of two-photon decay in highly charged ions and searches for narrow electron-positron peaks in heavy-ion collisions near the Coulomb barrier. A measurement of the spectral distribution of photons from the two-photon decay of the 2 {sup 1}S{sub 0} level in heliumlike krypton will be reported. The measurement provides a test of the theoretical calculations of the decay rate which complements earlier measurements of the lifetime of this level. A proposed experiment to measure parity nonconservation in heliumlike ions using two-photon decay will also be discussed. Finally, a short report will be given on the latest results from the APEX experiment designed to search for sharp lines in the sum-energy spectra of positrons and electrons produced in collisons between very heavy ions. No lines were found in the data for {sup 238}U + {sup 181}Ta collisions at 5.95, 6.1, and 6.3 MeV/u or in {sup 238}U + {sup 232}Th collisions at 5.95 MeV/u. Comparison will be made to evidence for narrow sum-energy lines previously reported by other groups.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 394235
• Report Number(s): CONF-9605105--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 3 Vol. 41; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DECAY
GEV RANGE 01-10
ION-ION COLLISIONS
KRYPTON IONS
MULTI-PHOTON PROCESSES
S STATES
TANTALUM IONS
THORIUM IONS
URANIUM IONS