[en] A new concept in high energy data acquisition systems called Fastbus has been developed and implemented at Brookhaven. The system which is capable of sub-gigabit/sec speeds has been operating for some time now. A number of modules including an on-bus processor, a PDP11 interface, 32 channel coincidence latches, a 16 channel scaler, a 32 channel μ-clock device, a 60 nsec memory and a predetermined time module have been developed and built. Features of the system include extensive use of ECL logic and a water cooled crate with conduction heat transfer within a module. The system is used in an on-line experiment at the AGS. Operating experience will be discussed

[en] We report on a search for the flavor-changing neutral-current decays K/sub L/⁰ → π⁰e⁺e/sup /minus//, K/sub L/⁰ → e⁺e/sup /minus// and K/sub L/⁰ → μ/sup +-/e/sup /minus plus//. Limits obtained for these processes are BR(K/sub L/⁰ → π⁰e⁺e/sup /minus//) < 3.2 /times/ 10/sup /minus/7/, BR(K/sub L/⁰ → e⁺e/sup /minus//) < 1.2 /times/ 10/sup /minus/9/, BR(K/sub L/⁰ → μ/sup +-/e/sup /minus plus//) < 1.9 /times/ 10/sup /minus/9/. 10 refs., 9 figs

[en] We report on a search for the rare decays K/sub L/⁰ → μ/sup +-/e/sup /minus plus//, K/sub L/⁰ → e⁺e/sup /minus//, and K/sub L/⁰ → π⁰e⁺e/sup /minus// at the Brookhaven AGS. Limits obtained for these processes are BR(K/sub L/⁰ → μ/sup +-/e/sup /minus plus//) < 1.9 /times/ 10/sup /minus/9/, BR(K/sub L/⁰ → e⁺e/sup /minus//) < 1.2 /times/ 10/sup /minus/9/, and BR(K/sub L/⁰ → π⁰e⁺e/sup /minus//) < 3.2 /times/ 10/sup /minus/7/. 4 refs., 2 figs

[en] Experiment 780 is a search for the rare K decays K/sub L/⁰ → μe and K/sub L/⁰ → e⁺e^-. We will be sensitive to these decays if the branching ratio is above 10^-10. To achieve this in a 1000 hr experiment will require an intense beam with about 2 x 10⁵ K decays/sec in the three meter decay region and over 10⁷ counts/m²/sec in the apparatus. We will need a multilevel event selection sequence which will accept good events with high efficiency but quickly reject most of the background events. 1 ref

[en] We report on a search for the flavor-changing neutral-current decays K/sub L/⁰ → π⁰e⁺e^-, K/sub L/⁰ → e⁺e^- and K/sub L/⁰ → μ/sup +-/e/sup /minus plus//. Limits obtained for these processes are BR(K/sub L/⁰ → π⁰e⁺e^-) < 3.2 x 10^-7, BR(K/sub L/⁰ → e⁺e^-) < 1.2 x 10^-9, BR(K/sub L/⁰ → μ/sup +-/e/sup /minus plus//) < 1.9 x 10^-9. 10 refs., 8 figs

[en] A typical high energy physics experiment requires both a high speed data acquisition and processing system, for data collection and reduction; and a general purpose computer to handle further reduction, bookkeeping and mass storage. Broad differences in architecture, format or technology, will often exist between these two systems, and interface design can become a formidable task. The PDP-11 series minicomputer is widely used in physics research, and the Brookhaven FASTBUS is the only standard high speed data acquisition system which is fully implemented in a current high energy physics experiment. This paper will describe the design and operation of an interface between these two systems. The major issues are elucidated by a preliminary discussion on the basic principles of Bus Systems, and their application to Brookhaven FASTBUS and UNIBUS

[en] A proposal to use the Space Radiation Effects Laboratory (SREL) 5-m cyclotron magnet as the basis of a large, simple dipole spectrometer at an ISABELLE colliding-beam intersection is discussed. The magnet and its disassembly, shipment, and reassembly are described. The use of the magnet is some possible experiments is sketched. In general, the spectrometer would be basic to the single-arm spectrometer extensions required for measurements of inclusive hadron spectra as well as multiarm spectrometers designed to record more complicated correlations. 3 figures

[en] An experiment to search for quarks at the CBA is described. The cross sections for the production of massive quark-antiquark pairs in nucleon-nucleon interactions is estimated, and the experimental design and procedures are described

[en] Prompt dimuon production from the interactions of 28.5 GeV protons with nuclear targets. The dimuon differential cross section dsigma/dx and the prompt muon to pion ratio are equal within errors to that found at an incident proton beam energy of 400 GeV. The atomic number dependence is found to be the same as that of the total proton nucleon cross section. The dimuon invariant mass distribution is presented. 13 references

[en] A large rotatable magnetic spectrometer was used to measure the sea-level energy spectra of cosmic-ray muons arriving at 30⁰ and 75⁰ zenith angle in the energy range 50--1700 GeV. The measured muon charge ratios and the ratio of the intensities at the two angles imply that the fraction of neutrons in the primary flux at energies above 1 TeV/nucleon is much larger than observed at lower energies and possibly as high as 25 %