[en] The authors present an integrated science software development environment, code maintenance and support system for the Sloan Digital Sky Survey (SDSS) now being actively used throughout the collaboration

[en] The Terabyte Analysis Machine Project is developing hardware and software to analyze Terabyte scale datasets. the Distance Machine framework provides facilities to flexibly interface application specific indexing and partitioning algorithms to large scientific databases

[en] We present the results of a search for neutrino oscillations at the Brookhaven National Laboratory. The experiment searched for the appearance of ν_e (bar ν_e), 1 km from the source of a wide-band ν_μ (bar ν_μ) beam. The experiment used a total of 3x10¹⁹ protons on target from the Alternating Gradient Synchrotron. The data collecting was split evenly between positive and negative horn polarities, corresponding to neutrino and antineutrino beams. No excess of ν_e or bar ν_e over the expected backgorund was detected. The 90%-confidence-level limits obtained are Δm²≤0.075 eV² for maximal mixing, and sin²2θ≤0.003 for large Δm²

[en] The Array Camera for Optical to Near-IR Spectrophotometry, or ARCONS, is a camera based on Microwave Kinetic Inductance Detectors (MKIDs), a new technology that has the potential for broad application in astronomy. Using an array of MKIDs, the instrument is able to produce time-resolved imaging and low-resolution spectroscopy constructed from detections of individual photons. The arrival time and energy of each photon are recorded in a manner similar to X-ray calorimetry, but at higher photon fluxes. The technique works over a very large wavelength range, is free from fundamental read noise and dark-current limitations, and provides microsecond-level timing resolution. Since the instrument reads out all pixels continuously while exposing, there is no loss of active exposure time to readout. The technology requires a different approach to data reduction compared to conventional CCDs. We outline here the prototype data reduction pipeline developed for ARCONS, though many of the principles are also more broadly applicable to energy-resolved photon counting arrays (e.g., transition edge sensors, superconducting tunnel junctions). We describe the pipeline’s current status, and the algorithms and techniques employed in taking data from the arrival of photons at the MKID array to the production of images, spectra, and time-resolved light curves

[en] We have constructed and operated a set of two parallel plate, segmented ionization chambers, to monitor the secondary charged particle flux in the narrow band neutrino beam at the AGS. These chambers were operated sucessfully in a high instantaneous flux (≅ 5x10¹⁴ cm^-2s^-1) environment, with linear response to beam intensity. They have been used to monitor the targeting of the primary proton beam, and provide measurements of the secondary beam profile as well as the absolute beam intensity in the tunnel. (orig.)

[en] A large system of 5760 Flash ADCs was used to instrument proportional drift tubes in a neutrino detector. The system uses a common clock source, is data driven, and builds the data stream in hardware. The design, construction, operation, and performance of this system is described. (orig.)

[en] Using data from Fermilab fixed-target experiment E769, we have measured particle-antiparticle production asymmetries for Λ⁰ hyperons in 250 GeV/c π^±, K^± and p-nucleon interactions. The asymmetries are measured as functions of Feynman-x (x_F) and p_T² over the ranges -0.12≤x_F≤0.12 and 0≤p_T²≤3 (GeV/c)² (for positive beam) and -0.12≤x_F≤0.4 and 0≤p_T²≤10 (GeV/c)² (for negative beam). We find substantial asymmetries, even at x_F around zero. We also observe leading-particle-type asymmetries. These latter effects are qualitatively as expected from valence-quark content of the target and variety of projectiles studied

[en] We observe an extraordinary link in the Crab pulsar between the enhancement of an optical pulse and the timing of the corresponding giant radio pulse. At optical through infrared wavelengths, our observations use the high time resolution of ARray Camera for Optical to Near-IR Spectrophotometry, a unique superconducting energy-resolving photon-counting array at the Palomar 200 inch telescope. At radio wavelengths, we observe with the Robert C. Byrd Green Bank Telescope and the Green Bank Ultimate Pulsar Processing Instrument backend. We see an 11.3% ± 2.5% increase in peak optical flux for pulses that have an accompanying giant radio pulse arriving near the peak of the optical main pulse, in contrast to a 3.2% ± 0.5% increase when an accompanying giant radio pulse arrives soon after the optical peak. We also observe that the peak of the optical main pulse is 2.8% ± 0.8% enhanced when there is a giant radio pulse accompanying the optical interpulse. We observe no statistically significant spectral differences between optical pulses accompanied by and not accompanied by giant radio pulses. Our results extend previous observations of optical-radio correlation to the time and spectral domains. Our refined temporal correlation suggests that optical and radio emission are indeed causally linked, and the lack of spectral differences suggests that the same mechanism is responsible for all optical emission

[en] Experiment E769 at Fermilab obtained charm hadroproduction data during the 1987-88 Fixed Target running period with a 250 GeV hadron beam incident on thin target foils of Be, Al, Cu, and W. From an analysis of 25% of the recorded 400M trigger sample we have explored the Feynman x, p_t² and the atomic number dependence of charm quark production using samples of D⁺ and D⁰ mesons. 7 refs., 4 figs

[en] A leading charm meson is one with longitudinal momentum fraction, x_F>0, whose light quark (or antiquark) is of the same type as one of the quarks in the beam particles. We report on the production asymmetry, A=[σ(leading-σ(nonleading)]/[σ(leading)+σ(nonleading)] as a function of x_F. The data consist of 1500 fully reconstructed D^± and D^*± decays in Fermilab experiment E 769. We find a significant asymmetry for the production of charm quarks is not expected in perturbative quantum chromodynamics