Particle physics: Experimental

Details Particle physics: Experimental Particle physics: Experimental

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ppe..rept.....l&link_type=abstract

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Astronomy and Astrophysics

Astrophysics

Emulsions, Hadrons, High Energy Interactions, Neutrinos, Nuclear Interactions, Particle Energy, Particle Production, Astrophysics, Balloon-Borne Instruments, Cosmic Rays, Data Bases, Muons

Scientific paper

We are continuing a research program in particle astrophysics and high energy experimental particle physics. We have joined the DUMAND Collaboration, which is constructing a deep undersea astrophysical neutrino detector near Hawaii. Studies of high energy hadronic interactions using emulsion chamber techniques were also continued, using balloon flight exposures to ultra-high cosmic ray nuclei (JACEE) and accelerator beams. As members of the DUMAND Collaboration, we are responsible for the development and construction of critical components for the deep undersea neutrino detector facility. We have designed and developed the acoustic positioning system required to permit reconstruction of muon tracks with sufficient precision to meet the astrophysical goals of the experiment. In addition, we are making significant contributions to the design of the database and triggering system to be used. Work has been continuing in other aspects of the study of multiparticle production processes in nuclei. We are participants in a joint US/Japan program to study nuclear interactions at energies two orders of magnitude greater than those of existing accelerators. The program uses balloon-borne emulsion chambers. On one of the flights we found two nuclear interactions of multiplicity over 1000 - one with a multiplicity of over 2000 and pseudorapidity density (approximately) 800 in the central region. At the statistical level of the JACEE experiment, the frequency of occurrence of such events is orders of magnitude too large. We have continued our ongoing program to study hadronic interactions in emulsions exposed to high energy accelerator beams.

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