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836 Matching Results
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VECTOR MESONS AS REGGE POLES IN PERTURBATION THEORY
It is shown that vector mesons may become Regge particles in higher orders of renormalizable perturbation theory. (auth)
Date:
May 1, 1963
Creator:
Freund, P G.O. & Oehme, R
Object Type:
Report
System:
The UNT Digital Library
On the Theory of Oxidation-Reduction Reactions Involving Electron Transfer. [Part] 5. Comparison and Properties of Electrochemical and Chemical Rate Constants
Using a theory of electron transfers which takes cognizance of reorganization of the medium outside the inner coordination shell and of changes of bond lengths inside it, relations between electrochemical and related chemical rate constants are deduced and compared with the experimental data. A correlation is found, without the use of arbitrary parameters. Effects of weak complexes with added electrolytes are included under specified conditions. The deductions offer a way of coordinating a variety of data in the two fields, internally as well as with each those in another. For example, the rate of oxidation or reduction of a series of related reactants by one reagent is correlated with that of another and with that of the corresponding electrochemical oxidation-reduction reaction, under certain specified conditions. These correlations may also provide a test for distinguishing an electron from an atom transfer mechanism. (auth)
Date:
April 1, 1963
Creator:
Marcus, R. A.
Object Type:
Article
System:
The UNT Digital Library
Neutrino Physics
The prediction and verification of the neutrino are reviewed, together with the V-A theory for its interactions (particularly the difficulties with the apparent existence of two neutrinos and the high-energy cross section). The Brookhaven experiment confirming the existence of two neutrinos and the cross section increase with momentum is then described, and future neutrino experiments are considered. (D.C.W.)
Date:
January 1, 1963
Creator:
Lederman, L. M.
Object Type:
Report
System:
The UNT Digital Library
NEUTRON PHYSICS DIVISION ANNUAL PROGRESS REPORT FOR PERIOD ENDING AUGUST 1, 1963
None
Date:
December 18, 1963
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Neutron Physics Division Annual Progress Report for Period Ending August 1, 1963
Separate abstracts were prepared for forty of the sixtytwo sections in the report. Three papers included were previously abstracted for NSA. (D.C.W.)
Date:
December 10, 1963
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Ministerial Roles: A Study of the Professional Roles of the Minister as they are Conceived by his Reference Group, the Church Members
This study is an attempt to discover the church members' hierarchy of ministerial roles and the social significance of their evaluations.
Date:
August 1963
Creator:
Ethridge, Franklin Maurice
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Theoretical Analysis of the Exponential Experiment in Natural Uranium
Methods of calculating the "Snell Experiment" (the exponential experiment in natural uranium) are examined. It is found that integral transport theory is required for accurate predictions. The effect of spatial transients upon measured quantities is studied and it is found that experiments have not been done in a large enough mass of uranium to achieve an asymptotic neutron distribution. However deviations from the asymptotic values of integral quantities are not large and corrections are calculated and applied to recent experiments. It is shown that the use of recent cross section data improves the agreement between theory and experiment. The relaxation length and all spectral indices are in fairly good agreement except for Np237 to U238 average fission cross section ratio.
Date:
March 8, 1963
Creator:
Michael, Paul
Object Type:
Report
System:
The UNT Digital Library
The Systematics of Baryon and Meson States
Present information on established and possible baryons and mesons, its derivation, and its organization on the basis of unitary symmetry are discussed. Some questions of particular interest in connection with the last point are considered. 35 references. (D.C.W.)
Date:
January 1, 1963
Creator:
Dalitz, R H
Object Type:
Report
System:
The UNT Digital Library
THE PRESENT EXPERIMENTAL AND THEORETICAL STATUS OF THE PROBLEM OF ELECTRON EJECTION IN THE ALPHA DECAY OF Po$sup 21$$sup 0$
The experimental measurements of electron ejection in Po/sup 210/ decay are discussed, and the theory of the process is outlined. The order-of-magnitude discrepancy between theory and experiment that was evident a decade ago has not yet been definitively resolved. The discrepancy is ascribed to an inadequacy of the theory, in particular to the use of an asymptotic expansion in that theory. Brief mention is made of some very recent unpublished calculations by G. W. Schaefer in which a reasonable estimate of the K-ejection probability is obtained by a procedure that avoids the asymptotic expansion. (auth)
Date:
January 1, 1963
Creator:
Rubinson, W.
Object Type:
Report
System:
The UNT Digital Library
The Strong and Weak Interactions of Bound a-Particles
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.
Object Type:
Report
System:
The UNT Digital Library
BASIC MATERIAL RESULTING FROM ANL ROCKET STUDY
The design and development of rocket reactors are considered. Topics included are: thermodynamic calculations of vapor pressure of uranium dioxide, uranium xeonosulfide, uranium monocarbide, zirconium monocarbide, beryllia, and tungsten; thermodynamic calculations of equilibrium interactions of the above materials with hydrogen or water; verification of muitigroup constants used in reactor physics calculations; relations pertaining to a heat transfer parameter study; a heat transfer coefficient correlation for hydrogen; a FORTRAN-II subroutine to compute thermal properties of hydrogen; considerations pertaining to reactor control; and fuel plate stress analyses. (N.W.R.)
Date:
May 1, 1963
Creator:
Cohn, C.; Golden, G.; Hoglund, B.; Loewenstein, W.; Rosenberg, G.; Sparks, D. et al.
Object Type:
Report
System:
The UNT Digital Library
Monte Carlo Calculations on Intranuclear Cascades
The basic assumption of the Serber model in the description of high- energy nuclear reactions is that the interactions of incident particles with complex nuclei can be described in terms of individual particle-particle collisions within the nucleus. Calculations were performed making use of the basic assumption of the Serber model, a more realistic nuclear model, recent cross-section data, and an exact statistical sampling technique. The sampling technique has not been used previously in calculations of this type. Calculations were performed for incident e (as Fe/sup 59 /sup +/, e (as Fe/sup 59 /sup -/, neutrons, and protons on nuclei from lithium to uranium. The energy range of the incident particles varied from about 50 to 350 Mev, i.e., the energy region in which pion production is not likely. Free-particle cross sections were used in determining the collisions within the nucleus, and statistical sampling techniques were used throughout, The problem was coded for the IBM-7090. Extensive comparisons with experiment were made and the results indicate that the calculation can be used to predict most of the cascade data for incident nucleons on complex nuclei, but only the gross features of the data are predictable for incident pions on nuclei. The effects …
Date:
May 16, 1963
Creator:
Bertini, H. W.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
High Energy Elastic Scattering of $Pi$$Sup 1$, P,/Anti P/ and K$Sup 1$ by Protons (and Regge Pole Predictions)
The counter hodoscope experiments at incident particle momenta of 7-20 Bev/c are summarized. The data are presented, together with the associated Regge pole analyses. The effective radii, opacities, and total cross sections obtained for the interactions are included. A magnetic spectrometer setup used for low four-momentum transfer data is also described, and optical theorem predictions for pi /sup -/-p and p-p are given. (D.C.W.)
Date:
June 27, 1963
Creator:
Lindenbaum, S. J.
Object Type:
Report
System:
The UNT Digital Library
Operating physics factors with zirconium tubes at the K Reactors
This document lists the physics factors for the K Reactors following the transition to the KV fuel element geometry and zirconium tubes. Each new parameter with the zirconium tube lattice has been calculated relative to the factors used with aluminum tubes and the KIV fuel elements. The purpose of this document is to provide working values for plant assistance use during the transition to the zirconium lattice. In some cases, where there are large uncertainties in the absolute values, the conservative end of the range has been provided for present operational use in safety and control administration. Refinement and publication of ``best`` values for the zirconium lattice based on the extensive experimental and calculational studies are included in future Reactor Physics Unit programs.
Date:
May 24, 1963
Creator:
Tiller, R. E. & Vaughn, A. D.
Object Type:
Report
System:
The UNT Digital Library
Interim report experience with PT IP-467-C reducing minimum downtime
The length of the minimum outage, or period of time during which a reactor must remain subcritical following a shutdown from equilibriu, is a direct function of the available excess reactivity. In reactors with unlimited safety system capacities, it is quite feasible to ``build in`` sufficient excess to allow complete override of the shutdown xenon transient, and thus, in effect, reduce the ``minimum downtime`` to zero. Present Hanford production reactors do not possess this unlimited capacity, and thus total pile reactivity must be restricted by minimum safety strength conditions. Any effort to increase the pile reactivity must therefore be tailored to satisfy existing Total control and Speed-of-control criteria. Production Test IP-467-C. ``Reducing Minimum Downtime,`` was designed to evaluate the economic benefits of a system in which base reactivity can be increased in periods of minimum control requirements, and correspondingly decreased when reactivity or safety considerations become more demanding. The purpose of this document is to summarize initial operating history and results obtained under the production test.
Date:
March 29, 1963
Creator:
Fredsall, J. R.
Object Type:
Report
System:
The UNT Digital Library
Instrumentation for Fission Fragment Energy Correlation Experiments
From International Conference on Nuclear Physics with Reactor Neutrons, Argonne, Ill., Oct. 1963. Experiments were performed in which the kinetic energies of correlated fragment pairs from thermal- and resonance-neutron-induced fission were measured. In addition, a three-parameter ternary fission experiment was performed in which the energies of correlated fragments were measured in coincidence with the energy of a third emitted particle, usually a long-range alpha particle. The detectors were large-area silicon surface barrier detectors. The instrumentation associated with these experiments is discussed in detail. The complete system is described, with attention given to the problems of background reduction (fast-coincidence requirements), stability, linearity, and resolution. Particular attention is given to the reduction of spectrum distortion by pile-up pulses (alphaon-fission pile-up within the amplifier resolving time). Methods and limitations of pile-up detection are discussed. A new method for inspection and removal of pile-up pulses is described. (auth)
Date:
January 1, 1963
Creator:
Williams, C. W.; Schmitt, H. W.; Walter, F. J. & Neiler, J. H.
Object Type:
Article
System:
The UNT Digital Library
Draft of physics sections to 100-N technical manual
The information presented is a collection of most of the physics information available for the New Production Reactor. The details of some of the physics information, particularly those dealing with exposure and temperature effects, are by no means to be considered the final word since there has been no experimental verification of these effects. However, the gross physics characteristics described are felt to be reasonable representations of the expected physics behavior of N Reactor and should serve as useful guides throughout the startup planning and initial operation.
Date:
January 25, 1963
Creator:
Nilson, R.
Object Type:
Report
System:
The UNT Digital Library
INTEGRAL NEUTRON THERMALIZATION. Annual Summary Report, October 1, 1961- September 30, 1962
3 3 9 9 7 6 : < 6 9 9 4 9 7 pulse of within a factor of two of the highest now available; operation was more than satisfactory. A pressure vessel to be used with the linac to measure neutron spectra of poisoned solutions for moderator temperatures up to about 600 l F was constructed. A 150-kv positive-ion accelerator was added to the linac facility to produce 2.5 and 14-Mev neutrons from T(d,n) and d(d,n) reactions. The 14-Mev neutron yield is about 10/sup 11/ neutrons/sec. Facilities for measuring neutron spectra were rearranged to eliminate systematic errors; reorientation of the 16-m detector bank necessitated remeasurement of the sensitivity of the bank as a function of neutron energy. Sensitivity of the 50-m bank was also remeasured. The effects on spectra of the scatterer, the location of pulsed neutron sources, the precollimator location and opening, and the linac intensity were also evaluated. To obtain information on the reliability of flux values predicted by standard transport theory approaches, angular dependent and scalar spectra were measured in 4- and 2-in. slab geometry and were compared with theoretical spectra. One-dimensional slab measurements were analyzed with the DSN and THERMOS codes. Results show that …
Date:
October 31, 1963
Creator:
Beyster, J. R.; Brown, J. R. & Honeck, H. C. et al.
Object Type:
Report
System:
The UNT Digital Library
PHYSICS DIVISION SUMMARY REPORT, MARCH-MAY 1963
None
Date:
October 31, 1963
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Fast Neutron Flux Through the Snap 10a Shield as Computed by Several Methods.
None
Date:
January 1, 1963
Creator:
Belcher, J. A. & Farr, W. M.
Object Type:
Report
System:
The UNT Digital Library
BETA-RAY SPECTROMETER WITH REDUCED SPHERICAL ABERRATION
Modern {beta}-ray spectrometers are based upon the concept, first introduced by Svartholm and Siegbahn in 1946, of focusing in both the radial and vertical directions. The theory of axially symmetric devices has been carefully studied by a large number of workers, culminating in the analysis, in 1956, of Lee-Whiting and Taylor. These last authors calculate aberrations through the sixth order and show that by appropriate choice of the magnetic field a spectrometer can be designed with a relatively large transmission and a high resolution. The acceptable transmission is remarkable because the second-order 'spherical' aberration in the median plane of the image cannot be made to vanish identically, and consequently the design is forced to a tall thin aperture (or a slightly less advantageous short wide aperture) which a priori would seem to imply a low transmission. It is the purpose of this communication to show that if the arbitrary restriction to axially symmetric fields is removed, then both the radial and the vertical contributions to the 'spherical' aberration can be made to vanish in second order. That azimuthally varying field (AVF) afford the freedom to accomplish this end may well be suspected in view of the technological revolution that the …
Date:
February 4, 1963
Creator:
Sessler, Andrew M.
Object Type:
Article
System:
The UNT Digital Library
The Determination of k∞ From Measurements on a Small Test Sample in a Critical Assembly
Abstract. The determination of the infinite multiplication factor, k∞ , from measurement son a small test sample was investigated by both theoretical and experimental techniques. Theoretical relations were developed to calculate the error in the measurement due to a mismatch between the flux ratios in the critical assembly and those of the test sample. Experiments were carried out at the Hanford Laboratory of the General Electric Company with the PCTR, to obtain values of the multiplication factor for comparison with the theoretical results. Calculations with two-group theory gave results that agreed with the experimental results when the test sample, with natural uranium fuel, was surrounded by a buffer region of the same material. When this buffer region was loaded with highly enriched fuel, the errors in the measured values were not predicted by the two-group theory. Three-group theory relations were derived which gave calculated values in agreement with the experimental values and indicated that a mismatch of the epithermal neutron group leads to the measured differences in the value of k∞ for the two buffer types.
Date:
November 1963
Creator:
Lanning, David Dayton
Object Type:
Report
System:
The UNT Digital Library
Magnetic Structure Studies at Brookhaven National Laboratory
The present communication reports the results of several investigations of magnetic structure and magnetic transitions currently in progress or recently completed at Brookhaven National Laboratory.
Date:
October 15, 1963
Creator:
Corliss, L. M.
Object Type:
Report
System:
The UNT Digital Library
SOLID STATE DIVISION ANNUAL PROGRESS REPORT FOR PERIOD ENDING MAY 31, 1963
Progress in solid state physics is reported in the following areas: theory, crystals, metals and nonmetals, radiation effects, and other subjects. Separate abstracts were prepared for the fifteen sections of the report. A list of 70 papers and publications is included. (D.C.W.)
Date:
August 23, 1963
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library