662 Matching Results

Search Results

Advanced search parameters have been applied.

Hupmobile cloud chamber parameters

Description: The accompanying table lists the presently selected parameters for the twelve cloud chambers. The chambers are numbered consecutively from 4 through 15 as they are lined up in the bunker. The lowest number is closest to the source. All except the first chamber have some thin metal filters to attenuate the flux and harden the spectrum. Cloud chambers 10, 12, and 14 are shielded by a collimator with about 200 pinholes in it. The flux in these chambers is attenuated by the ratio of the pinhole area to total beam area which is a factor of 50. Various gases and gas pressures are used to obtain suitable track lengths and interaction cross sections. Neon, argon, and krypton are used to obtain photo electrons. Hydrogen is used to obtain Compton electrons.
Date: September 28, 1967
Creator: Hansen, N. E.
Partner: UNT Libraries Government Documents Department

Double-Phase Representation of Analytic Functions

Description: The double phase representation for the elastic scattering amplitude A(s,t,u) as a function of the covariant Mandelstam variables s, t, and u is discussed. Conditions for the existence of the double representation, and their implications, are examined. The asymptotic forms of this double phase representation when some of s, t, and u become infinite are derived in the case when the phase approaches the limit at infinity not too slowly. This is the case when the elastic scattering anrplitude exhibits asymptotically a power behavior in energy (usually called the Regge behavior). In particular, the case when the forward peak of high-energy elastic scattering does not shrink is examined closely. No-shrinkage is found to be the case when the phase in the crossed channel does not diverge logarithmically at infinity in its momentum-transfer plane. If the forward peak shrinks, the above phase diverges logarithmically at infinity ln the case of no-shrinkage, the asymptotic shape of the forward peak is determined solely by the phase in the crossed channel. Furthermore, the above shape assumes a pure exponential function of the covariant momentum-transfer squared when momentum-transfer is small, and approaches a power behavior in the same variable for large momentumtransfer. Some of the specific predictions of the phase representation approach to high-energy elastic scattering are listed. (auth)
Date: January 1, 1963
Creator: Sugaware, M. & Nambu, Y.
Partner: UNT Libraries Government Documents Department

Self-Consistent Models of Strong Interaction With Chiral Symmetry

Description: Some simple models of (renormalizable) meson-nucleon interaction are examined in which the nucleon mass is entirely due to interaction and the chiral ( gamma /sub 5/) symmetry is broken'' to become a hidden symmetry. It is found that such a scheme is possible provided that a vector meson is introduced as an elementary field. (auth)
Date: April 1, 1963
Creator: Nambu, Y. & Pascual, P.
Partner: UNT Libraries Government Documents Department

On the Uniqueness of the Partial Wave Amplitudes

Description: It is assumed that all but a finite number N of partial waves associated with a two-body scattering amplitude are given, and the ambiguities associated with the remaining N waves are examined. It is proved that the N waves are uniquely determined except possibly for an additive s-wave constant if the scattering amplitude has crossing symmetry or if, in one of the crossed channels, there exists an energy region where the scattering is purely elastic. For the former case, the precise nature of the scattering amplitude analyticity need not be known. (auth)
Date: January 1, 1963
Creator: Balachandran, A. P.
Partner: UNT Libraries Government Documents Department

The Structure of the Weak Interaction $lambda$ + N $Yields$ N + N

Description: Empirical evidence on the nonmesic decay of LAMBDA hypernuclei is analyzed in terms of the spin and isospin dependence of the weak interactions A + p yields n + p and LAMBDA + n yields n + n. The nonmesic decay rates for / sub LAMBDA /He/sup 4/ and /sub LAMBDA /H/sup 4/ were obtained by treating the A de-excitation by different nucleons as incoherent and assuming the validity of the DELTA I = 1/2 selection rule for these interactions. The ratios of nonmesic to pi /sup -/ decay modes and of the first reaction to the second were calculated as 1.68 plus or minus 0.36 and 0.5, respectively, for He/sup 6/ decay. The later ratio for H/sup 4/ was predicted to be 1/(8.8 plus or minus 3.2). Interpretation of the rates is discussed, and it is concluded that if the LAMBDA I = 1/2 rule holds for the LAMBDA -N yields N-N weak interaction and if present ideas about the current-current nature of weak interactions are valid, then the higher-order mesonic corrections to this primary four-fermion interaction must mask the simplicity of their primary form. (D.C.W.)
Date: May 1, 1963
Creator: Block, M. M. & Dalitz, R. H.
Partner: UNT Libraries Government Documents Department

The Strong and Weak Interactions of Bound a-Particles

Description: Calculations on the S-wave LAMBDA -N and LAMBDA - LAMBDA interactions, binding energies for the p-shell hypernuclei, and the mesic decay and nonmesonic de-excitation of the A-particle are discussed. The theory behind the calculations, as well as the results and their interpretation, are considered. (D.C.W.)
Date: January 1, 1963
Creator: Dalitz, R. H.
Partner: UNT Libraries Government Documents Department

AN IMPROVED NUCLEAR DENSITY GAUGE. Period covered: September 2 to October 1, 1959

Description: Progress in development of a nuclear density gage for use in thickness and density measurements is reported. A Ross filter system for energy discrimination in the alpha ray region was constructed. Soller slits for collimating the radiation entering and leaving the filters so that a constant absorber thickness is seen by the radiation beam is under construction. Comments by visiting Russian scientists on the density gage and a discussion of their work in this area are included. (J.R.D.)
Date: October 31, 1960
Creator: Burgwald, G.M.
Partner: UNT Libraries Government Documents Department

Preliminary Studies of Scavenging Systems Related to Radiactive Fallout. Summary Report

Description: A program consisting of two related phases is described Ia Phase I, a study was made to find the relationship between the amount and nature of radioactivity, particle size distribution, and weight of particulate matter present in the lower troposphere. Emphasis was placed on the distribu tion of strontium-90 and total beta activity. Results of a limited number of analyses indicate that strontium-90 and total beta activity is associated primarily with particles below approximately 0.1 micron diameter. Phase II consisted of experimental studies on scavenging of solid particulate matter by water droplets. It was found that water vapor gradient around a condensing droplet promotes scavenging of particles of 1.3 micron and 0.3 micron diameters. The effect of water vapor gradient around an evaporating droplet is not well defined. (auth)
Date: April 29, 1960
Creator: Rosinski, J. & Stockham, J.
Partner: UNT Libraries Government Documents Department

Equation of State of Classical Systems of Charged Particles

Description: Recent developments in the classical theory of fully ionized gases and strong electrolyte solutions are reviewed, and are used to discuss the equation of state at high temperatures and low densities. The pressure is calculated using the ring-integral approximation, and quantitative estimates of higher correction terms are given. The effect of short range repulsive forces is shown by comparing the results with two kinds of potential functions hard spheres of diameter a, and soft'' spheres for which the short range potential cancels the Coulomb potential at the origin, and decreases exponentially with distance. It is found that the use of either type of potential extends the range of validity of the ring-integral approximation to considerably higher densities and lower temperatures. Since there is little difference in the results for the hard spheres and the soft spheres in this range, the latter system is investigated more extensively since it is more, easily handled by analytical methods. The expressions derived for the free energy of a system of charged particles can also be used in ionization equilibrium calculations, and the effect of electrostatic interactions on the equilibrium concentrations of various kinds of ions is indicated. 60 references. (auth)
Date: August 21, 1962
Creator: Brush, S.G.; DeWitt, H.E. & Trulio, J.G.
Partner: UNT Libraries Government Documents Department