3,209 research outputs found

    Numerical solutions of the one-dimensional nucleon-meson cascade equations

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    Numerical integration of meson-nucleon cascade equations for accelerator shielding calculation

    NC Data - Nuclear Collision Data for nucleon-nucleus collisions in the energy range 25 to 400 MeV

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    FORTRAN computer program for cross sections, and particle emission analysis in nucleon-nucleus collision

    Analytic representation of nucleon and pion-emission spectra from nucleon-nucleus collisions in the energy range 750-2000 MeV

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    Analytical representation of nucleon and pion emission spectra from nucleon-nucleus collisions in energy range 750-2000 Me

    A radiometer for stochastic gravitational waves

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    The LIGO Scientific Collaboration recently reported a new upper limit on an isotropic stochastic background of gravitational waves obtained based on the data from the 3rd LIGO science Run (S3). Now I present a new method for obtaining directional upper limits that the LIGO Scientific Collaboration intends to use for future LIGO science runs and that essentially implements a gravitational wave radiometer.Comment: 6 pages, 2 figure

    Analytic representation of nonelastic cross sections and particle-emission spectra from nucleon-nucleus collisions in the energy range 25 to 400 MeV

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    Analytic representation of nonelastic cross sections and particle emission spectra from nucleon-nucleus collisions in 25 to 400MeV energy rang

    On the theory of large amplitude Alfven waves

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    Large amplitude Alfvenic disturbances of arbitrary spatial shape and polarization are described by MHD equations, without resort to the usual assumption of planarity. However, because of their nonplanar nature, the direction of propagation of these disturbances cannot, in general, be determined by looking for minima in a variance matrix constructed from observed field fluctuations. When such minima exist, one is observing that subset of interplanetary Alfven waves that is essentially planar

    Coherent States and N Dimensional Coordinate Noncommutativity

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    Considering coordinates as operators whose measured values are expectations between generalized coherent states based on the group SO(N,1) leads to coordinate noncommutativity together with full NN dimensional rotation invariance. Through the introduction of a gauge potential this theory can additionally be made invariant under NN dimensional translations. Fluctuations in coordinate measurements are determined by two scales. For small distances these fluctuations are fixed at the noncommutativity parameter while for larger distances they are proportional to the distance itself divided by a {\em very} large number. Limits on this number will lbe available from LIGO measurements.Comment: 16 pqges. LaTeX with JHEP.cl

    Negatively Charged Strangelet Search using the E864 Spectrometer at the AGS

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    We provide a status report on the progress of searching for negatively charged strangelets using the E864 spectrometer at the AGS. About 200 million recorded events representing approximately 14 billion 10% central interactions of Au + Pt at 11.5 GeV/c taken during the 1996-1997 run of the experiment are used in the analysis. No strangelet candidates are seen for charges Z=-1 and Z=-2, corresponding to a 90% confidence level for upper limits of strangelet production of ~1 x 10^{-8} and ~4 x 10^{-9} per central collision respectively. The limits are nearly uniform over a wide range of masses and are valid only for strangelets which are stable or have lifetimes greater than ~50 ns.Comment: 6 pages, 4 figures; Talk at SQM'98, Padova, Italy (July 20-24, 1998

    Measurement of the B Semileptonic Branching Fraction with Lepton Tags

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    We have used the CLEO II detector and 2.06fb^(-1) of ϒ(4S) data to measure the B-meson semileptonic branching fraction. The B→Xeν momentum spectrum was obtained over nearly the full momentum range by using charge and kinematic correlations in events with a high-momentum lepton tag and an additional electron. We find B(B→Xeν) = (10.49±0.17±0.43)%, with overall systematic uncertainties less than those of untagged single-lepton measurements. We use this result to calculate the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element V_(cb) and to set an upper limit on the fraction of ϒ(4S) decays to final states other than BB̅
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