Physics – Atomic Physics
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mfsku..43...67i&link_type=abstract
Memoirs of the Faculty of Science, Kyoto University, Series of Physics, Astrophysics, Geophysics and Chemistry, (ISSN 0368-9689)
Physics
Atomic Physics
Atomic Physics
Scientific paper
A hybrid emulsion experiment KEK-PS E373 was carried out to study double-strangeness nuclei produced via Ξ- hyperon capture at rest with the expectation of ten times larger statistics than a previous experiment. The experiment employed a 1.66 GeV/c separated K- beam and 69 l nuclear emulsion. The Ξ- hyperons were produced in a diamond target via the (K-, K+) reaction and were brought to rest in the emulsion. The (K-, K+) reaction was tagged by a spectrometer system. Scintillating-fiber detectors were used both to measure the Ξ- hyperon track and to select events to be analyzed in the emulsion. Tracks of the Ξ- candidates were searched for and traced in the emulsion by a newly-developed automatic track scanning system. Until now, 6% of the total emulsion has been analyzed. We found one twin Λ hypernuclei event and one double-Λ hypernucleus at Ξ- hyperon stopping points. The two events were reconstructed kinematically using the information about the ranges and angles of the tracks. The species of the Ξ--atom and the fragmentation products were uniquely identified for the first time for twin-hypernuclei events. Sequential weak decay of the double-Λ hypernucleus was observed.
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