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Mound Facility activities in chemical and physical research: July-December 1979

Description: Research is reported in the following fields: isotope separation (Ar, C, He, Kr, Ne, O, Xe), low-temperature research (H intermolecular potential functions, gas analysis in trennschaukel), separation chemistry (/sup 229/Th, /sup 231/Pa, /sup 230/Th, /sup 234/U), separation research (liquid thermal diffusion, Ca isotope separation, molecular beam scattering, mutual diffusion of noble gas mixtures, lithium chemical exchange with cryptands), and calculations in plutonium chemistry (algorithms, val… more
Date: June 18, 1980
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Summary of S = 0 dibaryon resonances and candidates

Description: Experimental data concerning S = O dibaryon resonances are reviewed, with an emphasis on the nucleon-nucelon system. Structures observed in the ..gamma..d channel, the ..pi..d elastic scattering, pp ..-->.. ..pi..d channel, and other channels are discussed. Experimental data are compared with various theories. The short-range forces can be represented by dibaryon resonances. Further measurements to clarify the understanding of dibaryons are also discussed. 53 refs., 24 figs.
Date: April 18, 1985
Creator: Yokosawa, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Extension of the method of the small angle approximation: open detector

Description: We use the radiative transfer equation to study the multiple scattering undergone by a laser beam propagating through a turbid medium. During the propagation, we view the beam as first scattering into a narrow forward cone, and then into a diffuse pattern. To describe this process, we propose a systematic and practical method to combine the small angle approximation with the diffusion approximation. The method works when the scattering cross-section describing scattering from aerosols can be wr… more
Date: August 18, 1986
Creator: Chitanvis, S.M. & Gerstl, S.A.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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New parameterization of the E1 gamma-ray strength function

Description: The giant dipole (GD) parameters of peak energy, width, and cross section were satisfactorily correlated for elements from V to Bi, assuming two overlapping peaks with a separation dependent on deformation. The energy dependence of the GD resonance is assumed to have a Breit-Wigner form, but with an energy-dependent width. The resulting gamma-ray strength function model is used to predict neutron capture cross sections and gamma-ray spectra for isotopes of Ta, Os, and Au. 23 references.
Date: October 18, 1979
Creator: Gardner, D. G. & Dietrich, F. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Status report for data files and Monte Carlo transport codes maintained by the Physical Data Group of LLNL

Description: The Physical Data Group of the Theoretical Physics Division of LLNL has developed and maintains several basic data files, several Monte Carlo transport codes, and the requisite processing codes that convert the basic data to the form required by our own transport codes and by other laboratory transport and burn codes. The data files (libraries) that we maintain are listed together with a few comments about each.
Date: October 18, 1983
Creator: Howerton, Robert J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The energy dependence of the total charm cross section

Description: We discuss the energy dependence of the total charm cross section and some of its theoretical uncertainties including the quark mass, scale choice and the parton densities. We compare the next-to-leading order calculation of the total cross section with results obtained using PYTHIA.
Date: October 18, 2007
Creator: Vogt, R
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Criticality-Control Applications in the Nuclear Industry for Thermal Spray Amorphous Metal and Ceramic Coatings

Description: Amorphous metal and ceramic thermal spray coatings have been developed that can be used to enhance the corrosion resistance of containers for the transportation, aging and disposal of spent nuclear fuel and high-level radioactive wastes. Iron-based amorphous metal formulations with chromium, molybdenum and tungsten have shown the corrosion resistance believed to be necessary for such applications. Rare earth additions enable very low critical cooling rates to be achieved. The boron content of t… more
Date: July 18, 2007
Creator: Farmer, J & Choi, J
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

PHASE SHIFTS IN pi+ -p SCATTERING AT 310 Mev

Description: In an experimental program recently completed at the 184-inch synchrocyclotron in Berkeley, data were obtained on elastic {pi}{sup +}-p scattering at a laboratory energy of 310 Mev. Quantities measured were the differential cross section, the total cross section, and the polarization of the recoil protons as a function of center-of-mass angle. We have analyzed the data in terms of S, P, and D waves and have obtained only one acceptable solution. The resultant set of phase shifts is of the Fermi… more
Date: November 18, 1959
Creator: Foote, James H.; Chamberlain, Owen; Rogers, Ernest H.; Steiner,Herbert M.; Wiegand, Clyde & Ypsilantis, Tom
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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CHARGE-EXCHANGE SCATTERING OF NEGATIVE PIONS BY HYDROGEN AT 230,260, 290, 317 AND 371 MeV

Description: The differential cross section for charge-exchange scattering of negative pions by hydrogen has been observed at 230, 260, 290, 317, and 371 Mev. The reaction was observed by detecting one gamma ray from the {pi}{sup 0} decay with a scintillation-counter telescope.
Date: March 18, 1960
Creator: Caris, John C
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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Electron Scattering in Hot/Warm Plasmas

Description: Electrical and thermal conductivities are presented for aluminum, iron and copper plasmas at various temperatures, and for gold between 15000 and 30000 Kelvin. The calculations are based on the continuum wave functions computed in the potential of the temperature and density dependent self-consistent 'average atom' (AA) model of the plasma. The cross sections are calculated by using the phase shifts of the continuum electron wave functions and also in the Born approximation. We show the combine… more
Date: January 18, 2008
Creator: Rozsnyai, B F
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Detecting the Heavy Higgs Boson at the SSC

Description: Detection of a heavy Higgs boson (2M/sub z/ < M/sub H/ < 1 TeV) is considered. The production mechanisms and backgrounds are discussed. Their implementation in the PYTHIA and ISAJET Monte Carlo programs are checked. The decay modes H ..-->.. ZZ ..-->.. llll and H ..-->.. ZZ ..-->.. llvv are discussed in detail. The signal/background is evaluated and some relevant detector parameters are specified. Some remarks are also made concerning the requirements imposed on detectors by the decay mode H ..… more
Date: December 18, 1987
Creator: Cahn, R. N.; Chanowitz, M.; Golden, M.; Herrero, M. J.; Hinchliffe, I.; Wang, E. M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Nuclear Data Resources for Capture gamma-Ray Spectroscopy and Related Topics

Description: Nuclear reaction data play an important role in nuclear reactor, medical, and fundamental science and national security applications. The wealth of information is stored in internally adopted ENDF-6 and EXFOR formats. We present a complete calculation of resonance integrals, Westcott factors, thermal and Maxwellian-averaged cross sections for Z = 1-100 using evaluated nuclear reaction data. The addition of newly-evaluated neutron reaction libraries, and improvements in data processing technique… more
Date: August 18, 2011
Creator: Pritychenko, B. & Pritychenko,B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The MINERvA Experiment

Description: The MINERvA experiment is a dedicated cross-section experiment whose aim is to measure neutrino cross sections for inclusive and exclusive final states on several nuclei. The detector is fully commissioned and began running in March 2010. As a dedicated cross-section experiment, MINERvA has a particular need to know the incident neutrino flux: both the absolute level and the energy dependence. In these proceedings we describe the MINERvA detector, give an update on the experimental status, and … more
Date: March 18, 2011
Creator: Harris, Deborah A. & Kopp, Sacha
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Neutron-capture Cross Sections from Indirect Measurements

Description: Cross sections for compound-nuclear reactions play an important role in models of astrophysical environments and simulations of the nuclear fuel cycle. Providing reliable cross section data remains a formidable task, and direct measurements have to be complemented by theoretical predictions and indirect methods. The surrogate nuclear reactions method provides an indirect approach for determining cross sections for reactions on unstable isotopes, which are difficult or impossible to measure othe… more
Date: October 18, 2011
Creator: Escher, J E; Burke, J T; Dietrich, F S; Ressler, J J; Scielzo, N D & Thompson, I J
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

EFFECTS OF NITRIC ACID ON CRITICALITY SAFETY ANALYSIS

Description: As nitric acid molarity is increased, there are two competing phenomena affecting the reactivity of the system. First, there is interaction between each of the 10 wells in the basket-like insert. As the molarity of the nitric acid solution is increased (it moves from 100% water to 100% HNO{sub 3}), the hydrogen atom density decreases by about 80%. However, it remains a relatively efficient moderator. The moderating ratio of nitric acid is about 90% that of water. As the media between the wells … more
Date: August 18, 2011
Creator: Williamson, B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Theoretical study of asymmetric molecular-frame photoelectron angular distributions for C 1s photoejection from CO2

Description: We report the results of ab initio calculations of cross sections and molecular-frame photoelectron angular distributions for C 1s ionization of CO2, and propose a mechanism for the recently observed asymmetry of those angular distributions with respect to the CO^+and O^+ions produced by subsequent Auger decay. The fixed-nuclei, photoionization amplitudes were constructed using variationally obtained electron-molecular ion scattering wave functions. We have also carried out electronic structure… more
Date: February 18, 2009
Creator: Rescigno, Thomas N; Miyabe, S.; McCurdy, C.W. & Orel, A.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Final Report on Atomic Database Project

Description: Atomic physics in hot dense plasmas is essential for understanding the radiative properties of plasmas either produced terrestrially such as in fusion energy research or in space such as the study of the core of the sun. Various kinds of atomic data are needed for spectrum analysis or for radiation hydrodynamics simulations. There are many atomic databases accessible publicly through the web, such as CHIANTI (an atomic database for spectroscopic diagnostics for astrophysical plasmas) from Naval… more
Date: July 18, 2006
Creator: Yuan, J., Gui, Z., and Moses, G.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Indirect Methods for Nuclear Reaction Data

Description: Several indirect approaches for obtaining reaction cross sections are briefly reviewed. The Surrogate Nuclear Reactions method, which aims at determining cross sections for compound-nuclear reactions, is discussed in some detail. The validity of the Weisskopf-Ewing approximation in the Surrogate approach is studied for the example of neutron-induced fission of an actinide nucleus.
Date: November 18, 2005
Creator: Escher, J E & Dietrich, F S
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Using E-beam Mapping to Detect Coil Misalignment in NCSX

Description: Following assembly of the NCSX device, a program of e-beam mapping experiments is planned to validate the accuracy of the construction and assembly of the NCSX coil systems. To aid in the development of requirements for the e-beam mapping hardware and machine requirements, simulations of the e-beam mapping experiments, including various coil misalignments, have been done. The magnetic flux surface configuration was constructed using a numerical code, based on the Biot-Savart law, to calculate t… more
Date: October 18, 2005
Creator: Fredrickson E, Georgiyevskiy A, Rudakov V, Zarnstorff MC
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Final Report - Advanced Ion Trap Mass Spectrometry Program - Oak Ridge National Laboratory - Sandia National Laboratory

Description: This report covers the three main projects that collectively comprised the Advanced Ion Trap Mass Spectrometry Program. Chapter 1 describes the direct interrogation of individual particles by laser desorption within the ion trap mass spectrometer analyzer. The goals were (1) to develop an ''intelligent trigger'' capable of distinguishing particles of biological origin from those of nonbiological origin in the background and interferent particles and (2) to explore the capability for individual … more
Date: December 18, 2002
Creator: Whitten, W.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Comparing EM Models to RCS Measurements for Building-Penetration Radar

Description: For the DARPA VisiBuilding program, SRI International and Lawrence Livermore National Laboratory are using a variety of electromagnetic (EM) simulation codes and measurement techniques to analyze how radar pulses interact with building structures and materials. Of primary interest is how interior wall and corner reflections are delayed, attenuated, and dispersed by the exterior wall materials. In this paper, we compare microwave frequency-domain radar cross section (RCS) chamber measurements of… more
Date: May 18, 2007
Creator: Fasenfest, B & Ueberschaer, R
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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