| Early Detection of Breast Cancer via Multiplane Correlation Breast Imaging |
01 APR 2007 |
42 pages |
| Authors:
Anuj J. Kapadia; DUKE UNIV DURHAM NC
|
 | We are developing a tomographic technique called Neutron Stimulated Emission Computed Tomography (NSECT) for early detection of breast cancer. NSECT is sensitive to metabolic changes in trace element concentrations that are seen in tumors at very early stages of development. Detecting and measuring these element concentrations has the potential to detect breast cancer early. Using neutrons as the imaging radiation leads to significant concerns about patient dose. While preliminary experiments ... |
|
| Detecting Illicit Trafficking |
SEP 2001 |
11 pages |
| Authors:
Vladivoj Valkovic; INSTITUT RUDJER BOSKOVIC ZAGREB (YUGOSLAVIA)
|
| In today's society, acts of terrorism must involve in some stages the illicit trafficking either of explosives, chemical agents, nuclear materials and/or humans. Therefore the society must rely on the anti-trafficking infrastructure, which encompasses responsible authorities; their personnel and adequate instrumental base. |
|
| Steady-State, High Dose, Neutron Generation and Concentration Apparatus and Method for Deuterium Atoms |
07 SEP 1999 |
|
| Authors:
Han S. Uhm; Woodrow W. Lee; DEPARTMENT OF THE NAVY WASHINGTON DC
|
 | A steady-state source of neutrons is produced within an electrically grounded and temperature controlled chamber confining tritium or deuterium plasma at a predetermined density to effect implantation of ions in the surface of a palladium target rod coated with diffusion barrier material and immersed in such plasma. The rod is enriched with a high concentration of deuterium atoms alter a prolonged plasma ion implantation. Collision of the deuterium atoms in ... |
|
| Effects of Neutron Radiation on Resonant Cavity Light-Emitting Diodes |
DEC 95 |
72 pages |
| Authors:
Daniel S. Hinkel; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| Resonant Cavity Light Emitting Diodes (RCLEDs) were irradiated in Ohio State University's nuclear reactor to determine the effects of Neutron displacement damage. The RCLEDs were characterized both before and after irradiation by their current versus voltage curves (I-V curves) and external light power versus current curves (L-I curves). The I-V curves showed an increase in the "knee voltage" at a neutron fluence of l.45xl0(exp 17) neutrons/cm2. Logarithmic decreases in external ... |
|
| Plasma Physics Applications to Intense Radiation Sources, Pulsed Power and Space Physics. Short Pulse Ultra Intense Laser-Plasma Interaction Experiment |
31 MAY 93 |
25 pages |
| Authors:
R. N. Sudan; CORNELL UNIV ITHACA NY LAB OF PLASMA STUDIES
|
| Intense bright x-ray sources from dense z-pinch and x-pinch plasmas are being investigated for photo-pumping x-ray laser media. Crossed Aluminum wire X-pinches with mass line density up to hundreds of micrograms per centimeter have been imploded by up to 600 kA current for 40 ns using a 0.5 TW pulsed power generator. High density bright spots are observed. Soft x-ray spectroscopy was used to infer plasma density of up to ... |
|
| Methyl Torsional Levels of Solid Acetonitrile: A Neutron Scattering Study |
DEC 92 |
19 pages |
| Authors:
S. F. Trevino; C. S. Choi; D. A. Neumann; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL N J ARMAMENT ENGINEERING DIRECTORATE
|
| Neutron powder diffraction has been used to obtain the thermal parameters for the deuterium atoms and to confirm the crystal structure of acetonitrile-d3 at 4 K. Inelastic neutron scattering from both isotopic species is used to determine the energies of the first and second rotational levels of the methyl group. These four levels are reasonably reproduced by a three-fold potential with V3 = 125 meV. The activation energy derived from ... |
|
| EKXL: A Dynamic Poisson-Solver for Spherically-Convergent Inertial- Electrostatic Confinement Systems |
11 NOV 91 |
|
| Authors:
Katherine E. King; Robert W. Bussard; DIRECTED TECHNOLOGIES INC ARLINGTON VA
|
| The EKXL code is a 1-D radially-dependent Poisson-solver. It gives static solutions for potential and density distributions, given edge density specifications for these parameters. It is a 'point' model in that spatial variations of externally-imposed fields is possible, but spatial dependence of inter-particle interaction phenomena can not be accommodated as an integral part of code operations. KXL uses the same mathematical engine developed in the XL code and a series ... |
|
| Acquired Polarization in Fundamental Symmetry Experiments |
13 MAY 91 |
46 pages |
| Authors:
Paul A. Larson; NAVAL ACADEMY ANNAPOLIS MD
|
| One interesting class of fundamental symmetry violation tests involves the measurement of low energy neutron transmission through a thick target as projectile/target spin orientations are changed. As the neutron beam propagates through a target, certain components are preferentially absorbed by nuclear resonances. This induces regenerative effects in thick targets, known as the acquired polarization effect, which complicate the interpretation of transmission measurements. We focus on the role that nuclear resonance ... |
|
| BEAR (Beam Experiments Aboard a Rocket) Project. Volume 1: Project Summary |
01 JAN 90 |
121 pages |
| Authors:
G. J. Nunz; LOS ALAMOS NATIONAL LAB NM
|
| The U.S. Department of Defense's Strategic Defense Initiative Organization is sponsoring the development of neutral particle beam (NPB) technology for strategic defense applications. The first step in demonstrating the functioning of an NPB in space was the development and launch of the Beam Experiments Aboard a Rocket (BEAR) in New Mexico in July 1989. A government, laboratory, and industrial team, under the technical coordination of Los Alamos National Laboratory, designed, ... |
|
| Work-in-Progress Presented at the Army Symposium on Solid Mechanics - Lightening of the Force Held in West Point, New York on 7-9 October 1986 |
OCT 86 |
|
| Authors:
ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
|
| Contents: Computed Neutron Tomography and Coded Aperture Holography from Real Time Neutron Images; Spatial Sgrength Variation and Statistical Size of Laminated Orthotropic Composite Materials; A Direct Method to Obtain Constitutive Model Constants from cylinder Impact Test Results; Plastic Strain Localization Between Voids in Shear Deformation Fields; A Study of the Crack Tip Parameters that Govern Environmentally Assisted Cracking by Use of the Rising desplacement T est; Explicit and Implicit Soil ... |
|
| European Scientific Notes. Volume 37, Number 8 |
31 AUG 1983 |
|
| Authors:
Ronald W. Armstrong; Larry E. Shaffer; OFFICE OF NAVAL RESEARCH LONDON (ENGLAND)
|
| Partial contents: Small Firms--Growth and Jobs?; High Polymers as Thin Films; Robotics at ASEA; Software Systems Research at Linkping Institute of Technology; and European Microwave Semiconductor Devices Conference. |
|
| Analytical Investigation of Neutron Hardening of Integrated Injection Logic |
11 JUL 1980 |
|
| Authors:
R. L. Pease; MISSION RESEARCH CORP ALBUQUERQUE NM
|
| An analytical technique is presented for investigating the neutron induced degradation of integrated injection logic (I2L) inverter cells as a function of basic processing variables. The technique combines a one-dimensional semiconductor device code, the PN code, with the circuit analysis code SPICE. Predictions of neutron induced degradation as a function of npn transistor base doping, epitaxial thickness and resistivity and pnp transistor base width are presented for a second generation ... |
|
| Report of Cyclotron Facility Operations October 1, 1978 through September 30, 1979. |
28 DEC 1979 |
|
| Authors:
Rollon O. Bondelid; NAVAL RESEARCH LAB WASHINGTON DC
|
| During the twelve month period ending September 30, 1979 the cyclotron was used in support of ten research programs for a total 1690 hours of beam on target. These research programs are summarized in this report together with the details of beam time usage and facility engineering. No major operational problems were encountered this fiscal year. This report is presented as an annual report on cyclotron facility operation. |
|
| Transient Field Reversal with a Proton Layer. |
27 DEC 1979 |
|
| Authors:
C. A. Kapetanakos; J. Golden; J. A. Pasour; S. J. Marsh; R. A. Mahaffey; NAVAL RESEARCH LAB WASHINGTON DC
|
| This report describes a series of experiments that led to the transient field reversal of the applied magnetic field with a proton pulse. The 400-500 KA, 50 nsec duration, 1.7 MeV peak energy hollow proton pulse is generated by an Inverse Reflex Tetrode. After passing through the cusp, the pulse propagates in a uniform field with 1.15 cm/nsec axial velocity, when the applied voltage on the anode is 1MV. (Author) ... |
|
| Report of Cyclotron Facility Operations October 1, 1978 through June 30, 1979. |
28 SEP 1979 |
|
| Authors:
Rollon O. Bondelid; NAVAL RESEARCH LAB WASHINGTON DC
|
| During the nine month period ending June 30, 1979 the cyclotron was used in support of eight research programs for a total 1325 hours of beam on target. These research programs are summarized in this report together with the details of beam time usage and facility engineering. No major operational problems were encountered this year. |
|
| Nuclear Techniques for Plasma Diagnostics. |
23 APR 1979 |
|
| Authors:
FranK C. Young; NAVAL RESEARCH LAB WASHINGTON DC
|
| Recent developments of nuclear techniques to measure neutrons and positive ions emitted from pulsed-plasma devices are reviewed. Neutron detection for intensities ranging from 100 to 10 to the 12th power neutrons/pulse is described. Activation detectors are useful for yields exceeding 1,000,000 neutrons. Scintillation detectors are required for less intense yields and for neutron measurements by time-of-flight. Intense pulsed ion beams are measured with nuclear reactions which produce delayed radioactivity. This ... |
|
| Neutral-Beam-Sustained Astron Reactor. |
26 MAR 1979 |
|
| Authors:
Kwo Ray Chu; Christos A. Kapetanakos; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The disclosure is directed to a method and device for containing a high temperature plasma and generating neutrons. A tritium plasma is confined in a closed magnetic field configuration produced by the combination of an externally applied magnetic field and the self magnetic field of a fast rotating deuterium ion layer and heated by coulomb collisions within the deuterium ion layer. The system is maintained at a steady state by ... |
|
| Supplemental Development Testing of Cryogen Cooled Systems for Cryopumping Gaseous Hydrogen. |
06 JUN 1978 |
|
| Authors:
H. R. Miller; ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFS TN
|
| Three additional type A cryopump assemblies were tested in the Aerospace Research Chamber (12V) test unit, von Karman Gas Dynamics Facility (VKF) during April 24 to May 15, 1978, in support of Neutral Beam Injection work being done by the Energy Research Development Administration (ERDA), Oak Ridge National Laboratory (ORNL). These cryopumps were additional requirements which resulted from previous developmental work at AEDC. The objectives of the tests were to ... |
|
| Mighty Epic Instrumentation Summary. |
SEP 1976 |
|
| Authors:
DEFENSE NUCLEAR AGENCY KIRTLAND AFB NM TEST DIRECTORATE
|
| Science Applications, Incorporated (SAI) fielded two experiments on the Mighty Epic Event: (1) a Neutron Time of Flight (NTOF) experiment that made nine measurements of neutron fluence as a function of time; and (2) a Fast Spectral experiment that made 18 X-ray fluence measurements as a function of spectral energy, plus two gamma flux measurements. Data were recorded on oscilloscopes in Roses 004, located in the ROSES drift, and in ... |
|
| Neutron-, Ion- and Electron-Energy-Spectra in a 1 KJ Plasma Focus. |
OCT 1975 |
|
| Authors:
H. Krompholz; L. Michel; K. H. Schoenbach; Heinz Fischer; TECHNISCHE HOCHSCHULE DARMSTADT (WEST GERMANY) DEPT OF APPLIED PHYSICS
|
| The neutron energy spectrum (4 Torr deuterium) was determined from 30 m flight histograms. An average energy of approximately 125 keV of the neutron producing deuterons within an assumed cone angle approximately 40 degrees along the z-axis was calculated by means of the target beam model. Substantial neutron production extends more than 10 cm beyond the 1 cm long focus and propagates with a 3 to 5 x 10 to ... |
|
| Cooperative Radiation Effects Simulation Program. |
FEB 1974 |
|
| Authors:
L. E. Steele; E. A. Wolicki; NAVAL RESEARCH LAB WASHINGTON D C
|
| The report describes progress in: (1) developing the NRL Code E-DEP-1 for energy deposition by heavy ions, (2) modifying the Manning and Pagett transport theory for the penetration of heavy ions near the surface, (3) an investigation of the total crosssection corresponding to the differential cross section of Lindhard, Nielsen, and Scharaff, (4) an investigation of the temperature dependence of nickel-ion damage in nickel, (5) a study of the flux ... |
|
| Tensile Properties of an Ultrahigh-Strength Graphite Fiber in an Epoxy Matrix. |
12 DEC 1973 |
|
| Authors:
T. T. Chiao ; M. A. Hamstad ; E. S. Jessop; CALIFORNIA UNIV LIVERMORE LAWRENCE LIVERMORE LAB
|
| The fiber performance and potential as a reinforcement for fiber composites of a special PAN/based graphite fiber were evaluated by testing the fiber's tensile properties in an epoxy matrix. Representative strand samples were taken from 30 spools (-4 kg) of single-end, 1 500-filament fiber to make over 5 000 fiber/epoxy strand specimens using the filament-winding process. Characteristics studied were fiber uniformity, strength and modulus distributions at room and liquid nitrogen ... |
|
| Investigation of Nuclear Radiation Effects on Infrared Detectors. |
AUG 1973 |
|
| Authors:
Martin Warren; MCDONNELL DOUGLAS ASTRONAUTICS CO HUNTINGTON BEACH CA
|
| The effects of reactor neutron irradiation on the response characteristics of gallium-doped silicon infrared detectors were determined. Three neutron irradiations were conducted at 4.3 K at fluences of approximately 10 to the 10th power, 10 to the 12th power and 10 to the 14th power n/sq cm (E> 10 Kev). Measurements were made at 4.3 K of detector response to a simulated blackbody IR source and changes in the signal ... |
|
| Irradiation Effects on Reactor Structural Materials. |
15 NOV 1972 |
|
| Authors:
L. E. Steele; NAVAL RESEARCH LAB WASHINGTON D C
|
| The research program of the NRL Metallurgy Division, Reactor Materials Branch, involves a broad study of the effects of nuclear radiation upon materials. The report, covering research for the period 1 Aug-31 October 1972, includes: J-integral characterization of irradiated 304 stainless steel; Studies of fatigue crack propagation in neutron irradiated stainless steel weldments; Exploratory assessments of A508 forging radiation resistance; A parametric study of the vacancy trapping during irradiation; Surveillance ... |
|
| Irradiation Effects on Reactor Structural Materials. |
15 AUG 1972 |
|
| Authors:
L. E. Steele; NAVAL RESEARCH LAB WASHINGTON D C
|
| The report, covering research for the period 1 May-31 July 1972 includes: (1) fatigue crack growth in helium-implanted stainless steel, (2) heavy ion damage studies, (3) neutron irradiation effects on fatigue crack growth in stainless steels, (4) exploratory assessments of postirradiation fracture extension resistance, and (5) the J-integral and R-curve characteristics of irradiated stainless steel. (Author) |
|
| Irradiation Effects on Reactor Structural Materials. |
15 MAY 1972 |
|
| Authors:
L. E. Steel; F. A. Smidt Jr.; J. A. Sprague; P. Shahinian; H. E. Watson; NAVAL RESEARCH LAB WASHINGTON D C
|
| The research program involves a broad study of the effects of nuclear radiation upon materials. The report, covering research for the period 1 February - 30 April 1972, includes: (1) electron microscopy observations of radiation damage in pressure vessel steels and iron alloys, (2) the effect of neutron irradiation on fatigue crack propagation in austenitic stainless steel at high temperature, (3) a study of radiation reduction in notch toughness of ... |
|
| DOD Conference on Nondestructive Testing (20th), 10-12 November 1971. |
30 MAR 1972 |
|
| Authors:
Bernard W. Boisvert; Henry M. Gundersen; NAVAL AIR REWORK FACILITY JACKSONVILLE FL
|
| Approximately annually, since 1951, the Department of Defense has held a conference on nondestructive testing. These meetings are open only to civil service and military personnel and to selected guests invited by the Conference Steering Committee. This document is a compilation of the six problems presented for discussion among the attendees. In addition, fourteen technical papers were presented which described work underway or recently completed at the presenter's facility. The ... |
|
| Application of a Reactivity Computer to a Triga Reactor. |
13 SEP 1971 |
|
| Authors:
Steven A. Helms; Joseph V. Boykin; ARMY ENGINEER REACTORS GROUP FORT BELVOIR VA ENGINEERING DIV
|
| A commercially available reactivity computer was used to calibrate control rods at the TRIGA reactor. Experimental techniques are discussed in detail. Results are compared with those obtained using the facility's on-line data acquisition system computer. (Author) |
|
| Neutron Beam Diffusion in a Slab. |
JUL 1970 |
|
| Authors:
Edmund R. Hobbs; AIR FORCE WEAPONS LAB KIRTLAND AFB NM
|
| The distribution of monoenergetic neutrons in a uniform, nonmultiplying slab is treated in this report. The source is a 'pencil-thin' beam of neutrons normally incident upon the slab. Diffusion theory and the method of eigenfunctions are used to solve the problem in the general case. Data, based on this solution, are generated for a specific set of constants. (Author) |
|
| A RADIATION PROTECTION INTERLOCK SYSTEM FOR THE 8-MEV ICT TANDEM ACCELERATOR. |
JUN 1970 |
|
| Authors:
P. Kivett; D. Breitenbecher; H. J. Hennecke; AEROSPACE RESEARCH LABS WRIGHT-PATTERSON AFB OHIO
|
| A radiation protective system for a tandem accelerator utilizing interlocks, electric door locks and audio-visual warning devices is described. The system consists of four types of units. A master control panel (ACCELERATOR OPERATING CONDITION MONITOR) determines interlock and warning conditions by monitoring accelerator variables. An interlock control panel (INTERLOCK INDICATOR AND CONTROL PANEL) controls access to radiation areas. Warning lights and siren units (so called) present visual and audible indications ... |
|
| Development of Neutron Radiographic Techniques and Standards at the AFIT Nuclear Engineering Center. |
MAY 1970 |
|
| Authors:
D. E. Spreen; A. R. Bauer; A. N. Fasano; G. R. Hagee; J. A. Holloway; AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH
|
| The recently developed neutron radiography facility at the Air Force Institute of Technology Nuclear Engineering Center, Wright-Patterson Air Force Base, Ohio, was evaluated to determine its suitability for critical application to problems in inspection and analysis by Air Force scientists and contractors. The transfer technique using indium foil converter screens was used. Primary emphasis was placed upon the optimization of radiographic image sharpness using a specially designed resolution test object ... |
|
| PULSE NEUTRON GENERATOR, |
25 NOV 1969 |
|
| Authors:
A. Sh. Allakhverdov; G. I. Kiryanov ; V. A. Novoseltsev; V. V. Pochuev; A. V. Shurygin; FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
|
| An Author Certificate has been issued for a neutron pulse generator containing an accumulating capacitor, a high-voltage impulse transformer, an accelerator tube, and a start pulse generator. To simplify the system, the accumulating capacitor, which is connected in series to the primary winding of the pulse transformer, is connected in parallel to the discharge gap of the accelerator tube. |
|
| MEASUREMENT OF TOTAL NEUTRON CROSS SECTIONS AT THE US ARMY NUCLEAR DEFENSE LABORATORY, |
DEC 1968 |
|
| Authors:
E. G. Bacon Jr.; E. F. Quigley; A. W. Barrows Jr.; W. R. Van Antwerp; ARMY NUCLEAR DEFENSE LAB EDGEWOOD ARSENAL MD
|
| The report describes the transmission method for measuring total neutron cross sections. The method of sample alignment and transmission minimization are discussed. In addition, a review of the theory is given. Results for total neutron cross sections of gadolinium, calcium, and potassium, obtained by the transmission method, are presented. (Author) |
|
| An Analytical Pulse Reactor Model with Delayed Neutrons. |
DEC 1968 |
|
| Authors:
B. E. Leonard; ARMED FORCES RADIOBIOLOGY RESEARCH INST BETHESDA MD
|
| The Fuchs-Nordheim model is extended to develop an approximate solution to the point reactor equations of motion which includes delayed neutrons and nonadiabatic systems. Self-limiting reactor excursions are considered. Time-dependent relations for both reactor power and energy generated are obtained. The division of the time domain allows a superposition of the prompt burst and delayed neutron tail powers. The initial delayed neutron tail power is shown to be nearly independent ... |
|
| KAZAKHSTAN REACTOR BECOMES OPERATIONAL, |
10 SEP 1968 |
|
| Authors:
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
|
| The reactor is a powerful source of neutron and gamma-radiation and is designed for a wide range of scientific research experiments. Water is used both as the moderator and the reflector as well as for the coolant. It is fueled with enriched uranium, and is provided with approximately 30 vertical experimental channels. Ten horizontal channels can be used to bring neutron beams from the reactor core into an experimental room. ... |
|
| REACTOR UTILIZATION IN SUPPORT OF RESEARCH AND TECHNOLOGY. |
21 JUN 1968 |
|
| Authors:
Charles V. Strain; NAVAL RESEARCH LAB WASHINGTON D C
|
| The radiations generated in a nuclear reactor are useful not only in nuclear physics research but also in many nonnuclear fields of science and technology. A review of present and potential applications of the NRL 1-MW reactor is undertaken with the purpose of encouraging additional utilization of this facility. Neutron activation analysis, a technique capable of assaying very small amounts of many of the chemical elements, is widely used, with ... |
|
| FEASIBILITY OF NEUTRON ACTIVATION ANALYSIS ON PAPER. |
JUN 1968 |
|
| Authors:
F. Nelson Rodrigues; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| Thermal neutron activation and gamma-ray spectroscopy were used to detect and measure trace elements in alpha-cellulose and ash-free filter paper samples. Each sample was irradiated in a neutron flux of 5 x 10 to the 12th power n/cm sq/sec for periods of 10 and 30 minutes. The activated samples were analyzed by a 3 inch x 3 inch NaI(Tl) detector crystal and a 400 channel analyzer. The trace elements found ... |
|
| ACADEMY OF SCIENCES OF THE GEORGIAN SSR. INSTITUTE OF PHYSICS. ELECTRONIC AND IONIC PROCESSES IN SOLIDS, VOLUME 2, 1965 (SELECTED ARTICLES), |
21 MAR 1968 |
|
| Authors:
E. L. Andronikashvili; N. G. Politov; D. G. Driyaev; FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
|
| Contents: Radiative variation of dislocation density in alkali-halide crystals irradiated in a reactor at normal and low temperatures; and Low frequency internal friction in lithium fluoride crystals. |
|
| A FACILITY FOR THE STUDY OF NEUTRON MODERATION AT CRYOGENIC TEMPERATURES IN A LIGHT WATER POOL NUCLEAR REACTOR. |
AUG 1967 |
|
| Authors:
John J. Antal; Arthur F. Landry; Albert A. Warnas; ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MASS
|
| Holding a small amount of moderator material at very low temperatures in a nuclear reactor provides a very useful source for the production of high-intensity low-energy neutron beams, which beams are employed in studies concerning the solid and liquid structural state of materials. Since very little is known of the factors affecting the efficiency of such sources, an experimental facility has been placed in operation to study various parameters, particularly ... |
|
| NEUTRON SPECTRAL MEASUREMENTS BY MAGNETIC ANALYSIS OF RECOIL PROTONS. |
MAY 1967 |
|
| Authors:
C. M. Cialella; J. M. Connor; C. W. Hoffman; BALL BROTHERS RESEARCH CORP BOULDER COLO
|
| The spectral distribution of neutrons from the TRIGA Mark F Reactor at the U.S. Army Harry Diamond Laboratories was measured with a magnetic neutron spectrometer. This instrument is a broad range, low deflection spectrometer which utilizes the magnetic analysis of protons recoiling from a thin polyethylene radiator. The spectrometer will cover an energy range from 0.5 to 17 MeV with a single magnetic field setting. The spectrometer has an array ... |
|
| STRUCTURE IN THE TOTAL 24MG(N.P), 27A1(N,P), AND 27AL(N ALPHA) CROSS SECTIONS FROM 12 TO 15 MEV, |
15 FEB 1967 |
|
| Authors:
J. M. Ferguson; J. C. ALBERGOTTI; NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CALIF
|
| The relative cross sections of the 24Mg(n,p), 27Al(n,p), and 27Al(n, alpha) reactions were measured with accuracies of a few per cent of better. All three excitation functions fluctuate with periods of the order of a few hundred kilovolts and magnitude of a few per cent. The observed structure is consistent with the Ericson theory. (Author) |
|
| STUDY OF THERMAL NEUTRON CAPTURE GAMMA RAYS USING A LITHIUM-DRIFTED GERMANIUM SPECTROMETER, |
JAN 1967 |
|
| Authors:
Victor John Orphan; Norman C. Rasmussen; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| A gamma-ray spectrometer, using a 30 cc coaxial Ge(Li) detector, which can be operated as a pair spectrometer at high energies and in the Compton suppression mode at low energies provides an effective means of obtaining thermal neutron capture gamma spectra over nearly the entire capture gamma energy range. The energy resolution (fwhm) of the spectrometer is approximately 0.5% at 1 MeV and 0.1% at 7 MeV. Capture gamma-ray energies ... |
|
| NEUTRON ACTIVATION ANALYSIS. |
24 MAY 1966 |
|
| Authors:
A. L. Glass; Edwin S. Tankins; NAVAL AIR ENGINEERING CENTER PHILADELPHIA PA AERONAUTICAL MATERIALS LAB
|
| The object of the initial phase of the investigation was to obtain and install a system with adequate shielding for neutron activation analysis and to provide the additional laboratory facilities for its use. A description of the equipment obtained, with the shielding that was erected is given. (Author) |
|
| A BROAD RANGE MAGNETIC NEUTRON SPECTROMETER. |
MAY 1966 |
|
| Authors:
Carmen M. Cialella; BALLISTIC RESEARCH LABS ABERDEEN PROVING GROUND MD
|
| A broad range, low deflection, magnetic neutron spectrometer was designed and constructed to measure the neutron spectra from pulsed and steady state sources. The instrument will cover an energy range of 0.5 to 17 Mev with a single magnetic field setting and is designed to provide energy resolution of approximately 10 percent. A collimated beam of neutrons is allowed to impinge on a thin polyethylene radiator producing recoil protons. A ... |
|
| MEASUREMENTS AND SINGLE-VELOCITY CALCULATIONS OF DIFFERENTIAL ANGULAR THERMAL-NEUTRON ALBEDOS FOR CONCRETE. |
05 APR 1966 |
|
| Authors:
R. E. Maerker; F. J. Muckenthaler; OAK RIDGE NATIONAL LAB TENN
|
| Single-velocity Monte Carlo calculations and measurements were performed to determine the differential angular thermal-neutron albedos for a reinforced concrete from monodirectional beams of incident thermal neutrons. Preliminary calculations using a statistical estimation technique indicate up to 50 scatterings should be followed for each neutron in order to produce good estimates of the differential albedos, and up to 100 scatterings to produce good estimates of the capture gamma-ray differential dose albedos. ... |
|
| NEUTRON IRRADIATION AND THE YIELD SURFACES OF COPPER. |
JAN 1966 |
|
| Authors:
T. D. Dudderar; J. Duffy; BROWN UNIV PROVIDENCE R I DIV OF ENGINEERING
|
| Tests were conducted to determine the effects of irradiation and plastic deformation on the yield surfaces of polycrystalline copper. It was found that the principal effect of plastic deformation on unirradiated copper was to translate the yield surface without appreciably changing its size or shape. Irradiation, on the other hand, produced a very large change in the overall size of the initial yield surface; in other words, it produced an ... |
|
| WELDING OF TEFLON AND OTHER ORGANIC MATERIALS, |
JAN 1966 |
|
| Authors:
I. M. BARKALOV; V. I. Goldanskii; B. G. Dzantievand ; E. V. Egorov; ARMY FOREIGN SCIENCE AND TECHNOLOGY CENTER WASHINGTON D C
|
| A method is described for localizing the effect of ionizing radiation when welding polymeric materials with thermal neutrons. The method is based on the treatment of the surfaces to be welded with compounds of boron and lithium. |
|
| QUARTERLY PROGRESS REPORT. |
30 NOV 1965 |
|
| Authors:
HARVARD UNIV CAMBRIDGE MASS CYCLOTRON LAB
|
| Research progress is reported on the following topics: the cyclotron, knockout reactions, proton-proton bremsstrahlung, nuclear interactions in scintillators, monokinetic neutron beam, n-p incoherent cross section, biological uses of proton beams, gravitational red shift apparatus, resonant absorption in Sn 119 at low temperatures, nuclear magnetism in solid H2, properties of nuclei, nuclear interactions in molecules, and atomic hydrogen maser. |
|
| THE MAGNETIC SCATTERING OF NEUTRONS BY NICKEL. |
NOV 1965 |
|
| Authors:
Herbert A. Mook Jr.; HARVARD UNIV CAMBRIDGE MASS DIV OF ENGINEERING AND APPLIED PHYSICS
|
| By using the neutron as a probe, precise information can be obtained about the spatial distribution of the magnetic moment density in a ferromagnet that is quite free of theoretical approximations. By comparison of the measured form factors with free atom form factors, and by direct calculation of the magnetic moment density from the measured neutron data, it was found that the magnetic moment distribution in iron and cobalt agreed ... |
|
| HIGH ENERGY PHYSICS RESEARCH USING A 460 MEV SYNCHROCYCLOTRON. |
14 JUL 1965 |
|
| Authors:
Herbert L. anderson; CHICAGO UNIV ILL ENRICO FERMI INST FOR NUCLEAR STUDIES
|
| Doctoral dissertations are listed for students who conducted their research with the cyclotron. Also given is a chronological list of published research. |
|
Reports by Keyword(s)
NEUTRON BEAMS
