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Measurement of energy deposited by charged-particle beams in composite targets

Description: We have measured the energy deposited in two types of composite targets by a number of charged-particle beams: targets made of /sup 238/U, Lucite, and polyethylene were exposed to 0.26-GeV protons and 0.33-GeV deuterons, and aluminum-Lucite composites were exposed to 0.5-GeV electrons. In addition, we measured neutrons and gamma rays emitted from solid targets of various materials (including /sup 238/U and iron) exposed to 0.26-GeV protons and 0.33-GeV deuterons. We used passive detectors (ther… more
Date: July 2, 1980
Creator: Farley, E.; Becker, J.; Crase, K.; Howe, R. & Selway, D.
Partner: UNT Libraries Government Documents Department
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Photodisintegration of /sup 3/H and /sup 3/He. [Threshold to 25 MeV]

Description: The photoneutron cross sections for /sup 3/H and /sup 3/He have been measured from threshold to approx. 25 MeV with monoenergetic photons from the annihilation in flight of fast positrons at the LLL Electron-Positron Linear Accelerator facility. These reactions include the two-body breakup of /sup 3/H and the three-body breakup of both /sup 3/H and /sup 3/He; these measurements for /sup 3/H are the first to span the energy region across the peaks of the cross sections. An efficient BF/sub 3/-tu… more
Date: September 1, 1980
Creator: Faul, D.D.
Partner: UNT Libraries Government Documents Department
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NDA technology for uranium resource evaluation. Progress report July 1-December 31, 1979. [Gamma spectra calculations; field prototype photoneutron logging probe]

Description: This report describes work performed during the time period from July 1, 1979 to December 31, 1979, on the contract for Nondestructive Nuclear Analysis (NDA) Technology for Uranium Resource Evaluation in Group Q-1. Calculational effort was focused on improving the accuracy with which detector response function maps can be generated for subsequent enfolding with ONETRAN angular flux data. Experimental effort was highlighted by a field test of the prototype photoneutron logging probe at the Grand… more
Date: August 1, 1980
Creator: Evans, M.L.
Partner: UNT Libraries Government Documents Department
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Absolute measurement of anti. nu. for /sup 252/Cf

Description: Neutron yields were determined by measuring the activities produced in the INEL manganese bath. Of the three fission methods used, the neutron-fission coincidence method was found to be the most consistent and reliable. The value of /sup 252/Cf anti ..nu.. obtained by these measurements was 3.764. (RWR)
Date: January 1, 1980
Creator: Smith, J. R.; Reeder, S. D. & Gehrke, R. J.
Partner: UNT Libraries Government Documents Department
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N and. delta. resonances: an experimental review

Description: Experimental progress in N and ..delta.. resonances since the Oxford baryon conference is reviewed. The review concentrates on hadronic channels, and on developments of the last one or two years. The topics reviewed include the antiproton lifetime; the ..delta../sup + +/ magnetic moment; measurements of ..pi..N elastic and charge-exchange scattering in the ..delta.. region, the eta n threshold region, and the high-mass region; partial wave analyses of ..pi..N ..-->.. ..pi..N; measurements of tw… more
Date: July 1, 1980
Creator: Kelly, R.L.
Partner: UNT Libraries Government Documents Department
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Passive neutron dosimetry on cruise missile tests

Description: One of the components exercised during development tests of cruise missiles is the neutron generator that supplies the burst of neutrons needed to initiate a nuclear explosion. The subject of this report is a method of verifying the production of neutrons using a passive neutron activation technique that is sufficiently sensitive to detect a decay rate of a few atoms per hour.
Date: January 1, 1980
Creator: Ewing, R.I.
Partner: UNT Libraries Government Documents Department
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/sup 3/H(p,n)/sup 3/He differential cross sections below 5 MeV and the n-/sup 3/He cross sections. [2. 5 and 4. 0 MeV]

Description: Complete angular distributions for the /sup 3/H(p,n)/sup 3/He reaction were measured at 2.5 and 4.0 MeV with the /sup 1/H(t,n)/sup 3/He reaction used to obtain the backward yields. Because the distributions are peaked about 17% more strongly in the backward direction than the best previous elevation suggests (based on extrapolated data), the /sup 3/H(p,n)/sup 3/He reaction cross sections below 5 MeV were re-evaluated without the extrapolated data. The results were compared with recent total n-/… more
Date: July 1, 1980
Creator: Drosg, M.
Partner: UNT Libraries Government Documents Department
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Tensor analyzing powers in the /sup 1/H(d vector,pp)n reaction at 16 MeV. I. The symmetric, constant-relative-energy configurations

Description: Experimental results for the tensor analyzing powers A/sub xx/ and A/sub yz/ in the /sup 1/H(d-vector, pp)n reaction at 16 MeV for a series of symmetric, constant-relative-energy configurations are reported and compared with the results of recent Faddeev calculations using a separable NN potential. In general, the agreement seems fairly good, although there is some evidence that the measured values of A/sub yz/ tend to be slightly smaller than the prediction, whereas for A/sub xx/ the opposite … more
Date: January 1, 1980
Creator: Correll, F.D.; Ohlsen, G.G.; Brown, R.E.; Hardekopf, R.A.; Jarmie, N.; Schwandt, P. et al.
Partner: UNT Libraries Government Documents Department
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Analyzing-power formalism for three-body final states

Description: Various relations important for extraction of analyzing powers from data on reactions involving three particles in the final state were derived. Several of the results pertinent for spin-1/2 and spin-1 polarized beams are presented here. These may be used in analysis of the /sup 1/H(d-vector,pp)n reaction. 3 figures. (RWR)
Date: January 1, 1980
Creator: Ohlsen, G.G.; Brown, R.E.; Correll, F.D. & Hardekopf, R.A.
Partner: UNT Libraries Government Documents Department
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Evaluation of resonance parameters for neutron interaction with iron isotopes for energies up to 400 keV

Description: The evaluation of the resolved resonance parameters of iron isotopes 54, 56, and 57 in the neutron energy region below 400 keV is documented. Estimates of the uncertainties in the resonance parameters and correlation between the partial widths GAMMA/sub n/ and GAMMA/sub ..gamma../ are given when significant. Some details about the procedures used to evaluate the resonance parameters, their uncertainties, and correlations are reported. This evaluation was performed for the general-purpose file o… more
Date: September 1, 1980
Creator: Perey, C.M. & Perey, F.G.
Partner: UNT Libraries Government Documents Department
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Calculation of /sup 59/Co neutron cross sections between 3 and 50 MeV

Description: Knowledge of the /sup 59/Co(n,p), (n,..cap alpha..), and (n,xn) cross sections up to 50 MeV are necessary to satisfy priority dosimetry data needs of the FMIT facility. Since experimental data extend only to 25 MeV in the case of (n,xn) reactions (and lower energies for the others), these cross sections as well as those from competing reactions were calculated for neutron energies between 3 and 50 MeV. Neutron optical parameters were determined that were valid from several hundreds of keV to 50… more
Date: January 1, 1980
Creator: Arthur, E. D.; Young, P. G. & Matthes, W. K.
Partner: UNT Libraries Government Documents Department
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Frank loop unfaulting mechanism in fcc metals during neutron irradiation

Description: The unfaulting mechanism whereby sessile Frank dislocation loops evolve into a complex tangle of glissile dislocations during irradiation of face centered cubic metals is not well understood. It is presumed that such loops grow by absorption of point defects until interactions develop which provide sufficient impetus for nucleation of an unfaulting event. The loops then become glissile, interact and form a dislocation network. An alternate mechanism which has been observed to occur in an austen… more
Date: May 1980
Creator: Gelles, D. S.
Partner: UNT Libraries Government Documents Department
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First-wall fusion-blanket heat transfer

Description: To accommodate the high heat flux and neutron and gamma heat generation in the first wall of a fusion reactor, an array of tubes or tube-bank forms a first wall shield of the blanket. A series solution to the two-dimensional (in r,theta coordinates), time-dependent heat conduction equation has been found in terms of Fourier-Bessel (modified Bessel) functions. Steady-state solutions are found as limiting solutions. The heat sources are pulsed on and off to simulate the plasma burn and cool down … more
Date: January 1, 1980
Creator: Fillo, J.A.
Partner: UNT Libraries Government Documents Department
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Experimental nuclear and radiochemistry. Progress report, February 1, 1979-January 31, 1980. [Dept. of Chemistry, Carnegie-Mellon Univ. , Pittsburgh, Pennsylvania, 2/1/79 to 1/31/80]

Description: This project entails the investigation of deep nuclear spallation reactions induced by high-energy light particles on complex nuclei. Experimental studies involve activation of various medium- to heavy-mass targets bombarded by pi mesons, protons, and alpha particles. A prime objective is to deconvolve the cascade and evaporation steps in the reaction mechanism. Experimentally, then, particular emphasis has been placed on spallation products far from yield maxima. Irradiations have been perform… more
Date: January 1, 1980
Creator: Karol, P. J.
Partner: UNT Libraries Government Documents Department
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FITPULS: a code for obtaining analytic fits to aggregate fission-product decay-energy spectra. [In FORTRAN]

Description: The operation and input to the FITPULS code, recently updated to utilize interactive graphics, are described. The code is designed to retrieve data from a library containing aggregate fine-group spectra (150 energy groups) from fission products, collapse the data to few groups (up to 25), and fit the resulting spectra along the cooling time axis with a linear combination of exponential functions. Also given in this report are useful results for aggregate gamma and beta spectra from the decay of… more
Date: March 1, 1980
Creator: LaBauve, R. J.; George, D. C. & England, T. R.
Partner: UNT Libraries Government Documents Department
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Albedo technique for dose rates in cylindrical annular voids

Description: The angle-dependent albedo formula of French and Wells is combined with the albedo dose rate kernel and the resulting expression is integrated around the cylindrical surfaces representing the pressure vessel and primary shielding. The result is the dose rate above the annulus due to emergent neutrons streaming in the annulus adjacent to the pressure vessel.
Date: January 1, 1980
Creator: McCracken, R.T. & Grimesey, R.A.
Partner: UNT Libraries Government Documents Department
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Calculational methods used to obtain evaluated data above 3 MeV

Description: Calculational methods used to provide evaluated neutron data for nuclei between A = 19 and 220 at incident energies above several MeV range from empirical techniques based on cross-section systematics to sophisticated nuclear-model codes that describe the major mechanisms governing neutron reactions in this mass and energy range. Examples of empirical approaches are given along with discussion concerning regions of applicability and accuracies that can be expected. The application of more sophi… more
Date: January 1, 1980
Creator: Arthur, E. D.
Partner: UNT Libraries Government Documents Department
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A l-nCi/g sensitivity transuranic waste assay system using pulsed neutron interrogation

Description: We have developed a pulsed thermal neutron interrogation system and have demonstrated a sub-1-nCi/g assay sensitivity for high density TRU wastes contained in 200-liter barrels. We detect prompt fission neutrons, resulting in greatly enhanced sensitivity compared to techniques in which delayed fission neutrons are detected. We observe a linear assay response over at least three orders of magnitude in /sup 235/U (or /sup 239/Pu) mass. We also have measured a flat (to +-10%) interrogation flux pr… more
Date: January 1, 1980
Creator: Kunz, W.E.; Atencio, J.D. & Caldwell, J.T.
Partner: UNT Libraries Government Documents Department
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Calculability of the n-p mass difference in gauge theories

Description: The requirement of a calculable n-p mass difference leads to a consideration of unified gauge theories. Future developments in grand unified models may provide a realistic framework for the calculation of the n-p mass difference. The possibility that the relatively soft ultraviolet behavior of QCD softens the divergence in the lowest-order electromagnetic mass shift is considered in detail. It is shown that, if the bare mass and QCD coupling are constrained to be independent of the electromagne… more
Date: January 1, 1980
Creator: Kiskis, J.
Partner: UNT Libraries Government Documents Department
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Gamma Exposure Rates Due to Neutron Activation of Soil: Site of Hood Detonation, Operation Plumbbob

Description: This paper is the result of some recent discussions of exposure rates within the first few hours of the Hood detonation of the Plumbbob series due to neutron activation of soil. We estimated the exposure rates from 1/2 to 3 h after the detonation from ground zero to 1000 yards from ground zero. The area was assumed to be uncontaminated by fallout. Soil samples from the area of the Nevada Test Site at which the Hood device was detonated were sent to ORNL by Dr. John Malik of Los Alamos and by Mr… more
Date: June 1, 1980
Creator: Auxier, J. A. & Ohnesorge, W. F.
Partner: UNT Libraries Government Documents Department
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SEM technique for experimentally locating latch-up paths in integrated circuits

Description: A technique is presented for using the scanning electron microscope (SEM) in the electron-beam-induced current (EBIC) mode to delineate latch-up paths in CMOS ICs. In the EBIC mode, the current produced by the collection and separation of the electron-beam-generated electron-hole pairs in the space charge regions of the device is measured and used to form an image. Since the collection of these carriers is dependent on space charge region width (and thus junction potential), anything that alter… more
Date: January 1, 1980
Creator: Dressendorfer, P. V. & Armendariz, M. G.
Partner: UNT Libraries Government Documents Department
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ORELA measurements to meet fusion energy neutron cross section needs. [2 to 80 MeV]

Description: Major neutron cross section measurements made at the Oak Ridge Electron Linear Accelerator (ORELA) that are useful to the fusion energy program are reviewed. Cross sections for production of gamma rays with energies 0.3 < E/sub ..gamma../ < 10.5 MeV were measured as a function of neutron energy over the range 0.1 < E/sub n/ < 20.0 MeV for Li, C, N, O, F, Na, Mg, Al, Si, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, Nb, Mo, Ag, Sn, Ta, W, Au, Pb, and Th. Neutron emission cross sections have been measured f… more
Date: January 1, 1980
Creator: Larson, D.C.
Partner: UNT Libraries Government Documents Department
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ORNL irradiation creep facility

Description: A machine was developed at ORNL to measure the rates of elongation observed under irradiation in stressed materials. The source of radiation is a beam of 60 MeV alpha particles from the Oak Ridge Isochronous Cyclotron (ORIC). This choice allows experiments to be performed which simulate the effects of fast neutrons. A brief review of irradiation creep and experimental constraints associated with each measurement technique is given. Factors are presented which lead to the experimental choices ma… more
Date: September 1, 1980
Creator: Reiley, T. C.; Auble, R. L.; Beckers, R. M.; Bloom, E. E.; Duncan, M. G.; Saltmarsh, M. J. et al.
Partner: UNT Libraries Government Documents Department
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Shift-register coincidence electronics system for thermal neutron counters

Description: An improved shift-register, coincidence-counting logic circuit, developed for use with thermal neutron well counters, is described in detail. A distinguishing feature of the circuit is its ability to operate usefully at neutron counting rates of several hundred kHz. A portable electronics package incorporating the new coincidence logic and support circuits is also described.
Date: April 1, 1980
Creator: Swansen, J.E.; Collinsworth, P.R. & Krick, M.S.
Partner: UNT Libraries Government Documents Department
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