Recursos de colección

Caltech Authors (167.915 recursos)

Repository of works by Caltech published authors.

Group = Synchrotron Laboratory

Mostrando recursos 1 - 10 de 10

  1. Pion Photoproduction Data Below 1.5 GeV

    Beale, J. T.; Ecklund, S. D.; Walker, R. L.

  2. Selective Detectors for High Energy Photons and Electrons

    Heusch, Clemens A.; Prescott, Charles Y.
    For fast identification of high-energy electrons and photons in heavy backgrounds, a counter was developed consisting of successive layers of lucite and lead. Čerenkov radiation emitted in the lucite slabs is collected onto the photocathode of one 5 inch phototube. The geometry as well as the thickness of inserted lead converters can be adapted to kinematical requirements. At 1 BeV/c incoming momentum, the rejection ratio of e, γ showers vs. π or μ is better than 100:1; i.e., proper discrimination setting will allow rejection of 99% of all π's and μ's, while only 1% of e's and γ's will be lost....

  3. Refinements in Bubble Density Measurement

    Fretwell, L. J., Jr.; Coyne, D. G.; Mullins, J. H.

  4. A Study of the Second-Difference Method for Radial Magnet Alignment

    Mathews, Jon
    Preliminary estimates indicate that the cost of surveying the main ring of the proposed 300-BeV cascade synchrotron will be quite high, because of the large diameter (~ 1-1/2 miles) and small tolerances (~ 0.005 inch). Courant and Sands have suggested replacing conventional surveying techniques by a scheme in which the only measurements to be made are local, relating each magnet to its neighbors. In principle, these measurements would enable one to determine the magnet positions (to within an overall translation and/or rotation) much more simply than by conventional techniques. Furthermore, the procedure of measurement and adjustment could be carried out completely...

  5. A 25 Input Pulse Height Recording System

    Marshall, J. H.; Groom, D. E.
    A general description is given of a data recording system which provides a link between counter experiments in high-energy physics and a high-speed digital computer. The instrument described can accept as many as 25 simultaneous photomultiplier tube signals and pulse height analyze them into 100 channels each. Six bits of digital data may be substituted for any unused pulse height input. The usual output is perforated paper tape with a binary coded decimal format for use with a Burroughs 220 computer. Identification words can be set up and recorded on the tape. The speed of the paper tape perforator limits...

  6. A Note on the Leptonic Decays of the K-Meson

    Sharp, David H.; Wagner, William G.
    In this note we present an analysis of the leptonic decay modes of the K-meson in terms of a four-parameter representation of the two form factors F1(q^2) and F3(q^2) which describe the matrix element of the vector current of the weak interactions, < π |Vα| K >. Such a representation, while general enough to take account of the violation of the ΔΙ = 1/2 rule and the possible existence of two resonances in the K-π system, no longer permits unique predictions for the ratio of the electron to muon decay rate, or of the pion spectrum. We therefore suggest that...

  7. K Leptonic Decay and Partially-Conserved Currents

    Zweig, George
    An operational definition for the partial conservation of the strangeness changing vector current is given and applied to leptonic K^+ and K_2^0 decay. The K* resonance is explicitly included in the calculation and quantitative agreement with experiment is obtained. A detailed comparison with the K^+ data of Brown et. al. and Dobbs et. al. is given. Because of rapid variations of a form factor, it is found that the data of these two groups are not in contradiction. From the K_2^0 experiment of Luers et al., I = 1/2 and 3/2 currents are seen to exist. Λβ-decay is briefly considered. It...

  8. Lead Glass Total Absorption Counters

    Ruderman, H.; Gomez, R.; Tollestrup, A. V.
    Two identical large lead glass shower detectors, or Cerenkov counters, have been built to detect and measure the energies of decay photons from neutral pions. This method of detecting high energy gamma rays has the advantage of 100 percent efficiency, good energy resolution, linearity of response, insensitivity to heavy charged particles, and short time resolution. In addition, the physical size of the detector need only increase logarithmically with the energy of the incident particle to preserve linearity and resolution.

  9. Gauge Theories of Vector Particles

    Glashow, Sheldon L.; Gell-Mann, Murray
    The possibility of generalizing the Yang-Mills trick is examined. Thus we seek theories of vector bosons invariant under continuous groups of coordinate-dependent linear transformations. All such theories may be expressed as superpositions of certain "simple" theories; we show that each "simple" theory is associated with a simple Lie algebra. We may introduce mass terms for the vector bosons at the price of destroying the gauge-invariance for coordinate-dependent gauge functions. The theories corresponding to three particular simple Lie algebras — those which admit precisely two commuting quantum num- bers — are examined in some detail as examples. One of them might play...

  10. A Distributed Amplifier Using Transistors

    Barna, Arpad; Marshall, J. Howard
    A distributed amplifier with a stable gain of 10, risetime of 2.5 nanoseconds for 125 ohm load impedance is described. The maximum output voltage is 3.2 volts with negative polarity. The amplifier consists of 2 stages of 6 Philco 2N1742 transistors each and an emitter follower using a 2N1500. Design formulae are derived and detailed performance of a specific amplifier is given.

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