Astronomy and Astrophysics – Astronomy
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989puwl.reptr....g&link_type=abstract
Progress Report, Jan. 1988 - May 1989 Purdue Univ., West Lafayette, IN. Dept. of Physics.
Astronomy and Astrophysics
Astronomy
Beta Particles, Gamma Rays, High Energy Interactions, Hyperons, Mesons, Radiation Sources, Baryons, Gamma Ray Astronomy, Neutrinos, Storage Rings (Particle Accelerators), Superconducting Magnets
Scientific paper
The CLEO detector accumulated, (approximately 480,000 B-mesons) the world's largest sample of B decays, before being shutdown in May 1988 for the installation of CLEO II. This data sample came from 335 pb(-1) accumulated at the upsilon (4S). The Cornell Electron Storage Ring set new luminosity records, reaching 3.5 pb(-1) in a single day. These data are being intensively analyzed and 21 papers were given at the Baltimore APS meeting. Among the highlights are: confirmation of B(sup 0)(bar B)(sup 0) mixing; discovery of the charm-strange baryon xi (sub c)(sup 0); limits on b yields u decay; and non-observation of B yields p(bar p)pi(pi), which was reported by the ARGUS collaboration. The construction of CLEO II is proceeding on schedule. The new 1.5 T superconducting magnet has passed all tests and all of the detector elements have been installed. This includes a 7800 CsI crystals electromagnetic shower calorimeter. The data from the Gamma Ray Astrophysics experiment show a significant signal for high energy gamma ray emission from Cygnus X-3 and also confirm the previously reported anomalous period from Her X-1. Meanwhile, the old 6 mirror telescope has been refitted with 26 high resolution mirrors and improved fast electronics. GRANDE, the next generation detector based on the water Cherenkov technique, has been formally proposed to HEPAP. The detector will search for neutrino emission in the Southern Hemisphere and gamma radiation in the Northern Hemisphere.
Gaidos J. A.
Loeffler Frank J.
McIlwain R. L.
Miller David H.
Palfrey T. R.
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