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in subjects: "Neutron Beams"

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Summing up: The physics of NCT

Neutron Capture Therapy (NCT) is a binary system for treating tumors in which both an agent, usually B-10, and thermal neutrons are directed to a tumor where they combine and release lethal radiation. Directing the agent to the tumor is mainly a chemistry and biology problem, while the production, targeting and effects of the neutrons is mainly a physics problem. This paper briefly describes the, physics side of NCT as presented at this symposium, the neutron beams, the dosimetry and treatment … more

Date: April 1, 1993

Creator: Brugger, R. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Estimation of (n,f) Cross-Sections by Measuring Reaction Probability Ratios

Neutron-induced reaction cross-sections on unstable nuclei are inherently difficult to measure due to target activity and the low intensity of neutron beams. In an alternative approach, named the 'surrogate' technique, one measures the decay probability of the same compound nucleus produced using a stable beam on a stable target to estimate the neutron-induced reaction cross-section. As an extension of the surrogate method, in this paper they introduce a new technique of measuring the fission p… more

Date: April 21, 2005

Creator: Plettner, C.; Ai, H.; Beausang, C. W.; Bernstein, L. A.; Ahle, L.; Amro, H. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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DEVELOPMENT AND VALIDATION OF THE 7LI(P,N) NUCLEAR DATA LIBRARY AND ITS APPLICATION IN MONITORING OF INTERMEDIATE ENERGY NEUTRONS

Systematics have been created for neutron spectra from the 7Li(p,n) reaction at 0 degrees in the 50-200 MeV proton energy region. The available experimental data in the continuum part of the spectra show satisfactory overall agreement with a representation based on the phase-space distribution corresponding to the three-body breakup process 7Li(p,n 3He){alpha}, with empirical correction factors, which depend regularly on incident energy. Validation of the systematics included folding of the pre… more

Date: January 1, 2001

Creator: Mashnik, S. G. (Stepan G.); Chadwick, M. B. (Mark B.); Prokofiev, A. (Alexander); Olsson, N. (Nils) & Waters, L. S. (Laurie S.)

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Summary of the Research Progress Meeting

This summary discusses the following topics: (1) Neutron Scattering. By R. Hildebrand. A series of measurements have been made of the angular distribution of neutrons scattered from small spheres of various materials placed in the neutron beam of the l84-inch cyclotron. The scattered neutrons were detected by copper covered carbon detectors placed in a symmetrical arrangement about the scatterer. The carbon detectors, which wore activated by the neutrons through the C{sup 12}(n, 2n)C{sup 11} re… more

Date: November 1, 1947

Creator: Wakerling, R.K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The FIGARO Facility at Los Alamos : capabilities and first results /

A new beam line at the fast neutron spallation source at Los Alamos Neutron Science Center has been constructed for studies of neutron-induced reactions producing gamma rays, internal conversion electrons or neutrons. This facility, called FIGARO (Fast neutron-Induced GAmma-Ray Observer), follows on the great successes of GEANIE (described in other contributions to this Conference), by detecting de-excitation gamma rays with high-resolution germanium detectors. FIGARO has fewer gamma-ray detect… more

Date: January 1, 2001

Creator: Devlin, Matthew J.; Zanini, L.; O'Donnell, J. M.; Aprahamian, Ani; Saladin, J. X. & Haight, Robert C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Device for Writing the Time Tail from Spallation Neutron Pulses

Recent work at Los Alamos Neutron Science Center (LANSCE), has shown that there are large gains in neutron beam intensity to be made by using coupled moderators at spallation neutron sources. Most of these gains result from broadening the pulse-width in time. However the accompanying longer exponential tail at large emission times can be a problem in that it introduces relatively large beam-related backgrounds at high resolutions. We have designed a device that can reshape the moderated neutron… more

Date: January 1, 2001

Creator: Langan, Paul; Schoenborn, Benno P.; Langan, P. (Paul); Schoenborn, Benno P. & Daemen, L. L. (Luc L.)

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Proton Angular Distribution for 90 Mev Neutron-proton Scattering

The angular distribution of the recoil protons in neutron-proton scattering at 90 Mev has been measured for angles between 5{sup o} and 65{sup o} from the direction of the neutron beam. The neutrons were produced by stripping 190 Mev deuterons in a 1/2 inch Be target in the 184-inch F.M. cyclotron. R. Serber has calculated the neutron energy distribution; it has a peak at 90 Mev and a half width of 27 Mev. This distributiQn has been checked experimentally for the neutrons by Wilson Powell and b… more

Date: November 3, 1947

Creator: Hadley, James; Leith, Cecil E. & York, Herbert F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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High Intensity, Pulsed, D-D Neutron Generator

Single ion-beam RF-plasma neutron generators are presented as a laboratory source of intense neutrons. The continuous and pulsed operations of such a neutron generator using the deuterium-deuterium fusion reaction are reported. The neutron beam can be pulsed by switching the RF plasma and/or a gate electrode. These generators are actively vacuum pumped so that a continuous supply of deuterium gas is present for the production of ions and neutrons. This contributes to the generator's long life. … more

Date: August 1, 2008

Creator: Williams, D. L.; Vainionpaa, J. H.; Jones, G.; Piestrup, M. A.; Gary, C. K.; Harris, J. L. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A workshop on enhanced national capability for neutron scattering

This two-day workshop will engage the international neutron scattering community to vet and improve the Lujan Center Strategic Plan 2007-2013 (SP07). Sponsored by the LANL SC Program Office and the University of California, the workshop will be hosted by LANSCE Professor Sunny Sinha (UCSD). Endorsement by the Spallation Neutron Source will be requested. The discussion will focus on the role that the Lujan Center will play in the national neutron scattering landscape assuming full utilization of… more

Date: January 1, 2009

Creator: Hurd, Alan J; Rhyne, James J & Lewis, Paul S

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Review of the Lujan neutron scattering center: basic energy sciences prereport February 2009

The Lujan Neutron Scattering Center (Lujan Center) at LANSCE is a designated National User Facility for neutron scattering and nuclear physics studies with pulsed beams of moderated neutrons (cold, thermal, and epithermal). As one of five experimental areas at the Los Alamos Neutron Science Center (LANSCE), the Lujan Center hosts engineers, scientists, and students from around the world. The Lujan Center consists of Experimental Room (ER) 1 (ERl) built by the Laboratory in 1977, ER2 built by th… more

Date: January 1, 2009

Creator: Hurd, Alan J; Rhyne, James J & Lewis, Paul S

Item Type: Article

Partner: UNT Libraries Government Documents Department

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ANALYSIS OF THE INTERACTION OF 300-Mev NEUTRONS WITH XENON

An investigation of the interactions between 300-Mev neutrons and xenon was made by means of a cloud chamber in a pulsed magnetic field of 21,700 gauss placed in the neutron beam of the 184-inch Berkeley cyclotron. Eighty-seven negative pion events and 257 other stars were analyzed. In addition an experimental check was made on the energy of the incoming neutrons. Classification, identification, and angular and energy distributions of prongs associated with all events are presented. Interpretat… more

Date: October 17, 1956

Creator: Morris, Richard Herbert.

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

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Comparison and Validation of HEU and LEU Modeling Results to HEU Experimental Benchmark Data for the Massachusetts Institute of Technology MITR Reactor.

The Massachusetts Institute of Technology Reactor (MITR-II) is a research reactor in Cambridge, Massachusetts designed primarily for experiments using neutron beam and in-core irradiation facilities. It delivers a neutron flux comparable to current LWR power reactors in a compact 6 MW core using Highly Enriched Uranium (HEU) fuel. In the framework of its non-proliferation policies, the international community presently aims to minimize the amount of nuclear material available that could be used… more

Date: March 2, 2011

Creator: Newton, T. H.; Wilson, E. H; Bergeron, A.; Horelik, N.; Stevens, J. (Nuclear Engineering Division) & Lab.), (MIT Nuclear Reactor

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Neutronic Analyses for HEU to LEU fuel conversion of the Massachusetts Institute of Technology.

The Massachusetts Institute of Technology (MIT) reactor (MITR-II), based in Cambridge, Massachusetts, is a research reactor designed primarily for experiments using neutron beam and in-core irradiation facilities. It delivers a neutron flux comparable to current LWR power reactors in a compact 6 MW core using Highly Enriched Uranium (HEU) fuel. In the framework of its non-proliferation policies, the international community presently aims to minimize the amount of nuclear material available that… more

Date: March 2, 2011

Creator: Wilson, E. H.; Newton, T. H.; Bergeron, A.; Horelik, N.; Stevens, J. G (Nuclear Engineering Division) & NS), (

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Analysis of Recent Manifests for Goods Imported through US Ports

Several active interrogation techniques are being developed to detect shielded special nuclear materials (SNM) hidden in cargo containers loaded on container ships arriving at US ports. It raises the questions of the types of cargos in which SNM could be hidden, and their impact on detected signatures. Since the definition of a set of ''typical'' or standard cargos has proven to be difficult, we analyzed shipping manifests for US imports shipped through North American ports collected on 14 days… more

Date: September 27, 2006

Creator: Descalle, M; Manatt, D & Slaughter, D

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Accelerator Based Neutron Beams for Neutron Capture Therapy

The DOE-funded accelerator BNCT program at the Massachusetts Institute of Technology has resulted in the only operating accelerator-based epithermal neutron beam facility capable of generating significant dose rates in the world. With five separate beamlines and two different epithermal neutron beam assemblies installed, we are currently capable of treating patients with rheumatoid arthritis in less than 15 minutes (knee joints) or 4 minutes (finger joints) or irradiating patients with shallow … more

Date: April 11, 2003

Creator: Yanch, Jacquelyn C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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A Study of Neutron Proton Charge Exchange Scattering in the Momentum Range 50 - 200 GeV

It is proposed to measure the neutron-proton charge-exchange cross-section in an on-line counter experiment for four-momentum transfers between .002 and 1.0 (GeV/c){sup 2}. The experiment will be performed in an intense neutron beam with a continuous momentum spectrum; data will be taken simultaneously for all momenta between 50 and 200 GeV/c. At a beam intensity of 10{sup 7} neutrons/pulse, the true data-collection rate will be about .5 per pulse. Approximately 90,000 events will be obtained. … more

Date: June 1, 1970

Creator: Reay, N. W.; Reibel, K.; Romanowski, T. A.; Stanton, N. R.; U., /Ohio State; Abolins, M. A. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Experimental Transport Benchmarks for Physical Dosimetry to Support Development of Fast-Neutron Therapy with Neutron Capture Augmentation

The Idaho National Laboratory (INL), the University of Washington (UW) Neutron Therapy Center, the University of Essen (Germany) Neutron Therapy Clinic, and the Northern Illinois University(NIU) Institute for Neutron Therapy at Fermilab have been collaborating in the development of fast-neutron therapy (FNT) with concurrent neutron capture (NCT) augmentation [1,2]. As part of this effort, we have conducted measurements to produce suitable benchmark data as an aid in validation of advanced three… more

Date: June 1, 2006

Creator: Nigg, D. W.; Hartwell, J. K.; Venhuizen, J. R.; Wemple, C. A.; Risler, R.; Laramore, G. E. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Characterization of a Tunable Quasi-Monoenergetic Neutron Beamfrom Deuteron Breakup

A neutron irradiation facility is being developed at the88-Inch Cyclotron at Lawrence Berkeley National Laboratory for thepurposes of measuring neutron reaction cross sections on radioactivetargets and for radiation effects testing. Applications are of benefit tostockpile stewardship, nuclear astrophysics, next generation advancedfuel reactors, and cosmic radiation biology and electronics in space. Thefacility will supply a tunable, quasi-monoenergetic neutron beam in therange of 10-30 MeV or a… more

Date: December 14, 2006

Creator: Bleuel, D. L.; McMahan, M. A.; Ahle, L.; Barquest, B. R.; Cerny, J.; Heilbronn, L. H. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High Burn-Up Tests of U-Al Fuel Elements

A series of irradiation tests were performed on the High Flux Beam Reactor fuel elements. The U--Al fuel elements contained 30 to 40 wt% U and 3% Si. Burnup ranged from 20 to 50%. A summary of the results is given. (C.E.S.)

Date: October 31, 1964

Creator: Weeks, J. R.; McRickard, S. B. & Gurinsky, D. H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Final Report for the “WSU Neutron Capture Therapy Facility Support”

The objective for the cooperative research program for which this report has been written was to provide separate NCT facility user support for the students, faculty and scientists who would be doing the U.S. Department of Energy Office (DOE) of Science supported advanced radiotargeted research at the WSU 1 megawatt TRIGA reactor. The participants were the Idaho National laboratory (INL, P.I., Dave Nigg), the Veterinary Medical Research Center of Washington State University (WSU, Janean Fidel a… more

Date: August 24, 2006

Creator: Tripard, Gerald E. & Fox, Keith G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Initial Performance Characterization for a Thermalized Neutron Beam for Neutron Capture Therapy Research at Washington State University

The Idaho National Engineering and Environmental Laboratory (INEEL) and Washington State University (WSU) have constructed a new epithermal-neutron beam for collaborative Boron Neutron Capture Therapy (BNCT) preclinical research at the WSU TRIGATM research reactor facility1. More recently, additional beamline components were developed to permit the optional thermalization of the beam for certain types of studies where it is advantageous to use a thermal neutron source rather than an epithermal … more

Date: November 1, 2005

Creator: Nigg, David W.; Sloan, P. E.; Venhuizen, J. R. & Wemple, C. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Neutron beam irradiation study of workload dependence of SER in a microprocessor

It is known that workloads are an important factor in soft error rates (SER), but it is proving difficult to find differentiating workloads for microprocessors. We have performed neutron beam irradiation studies of a commercial microprocessor under a wide variety of workload conditions from idle, performing no operations, to very busy workloads resembling real HPC, graphics, and business applications. There is evidence that the mean times to first indication of failure, MTFIF defined in Section… more

Date: January 1, 2009

Creator: Michalak, Sarah E; Graves, Todd L; Hong, Ted; Ackaret, Jerry; Sonny, Rao; Subhasish, Mitra et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Initial increase, ''peaking effect'', in the internal friction of copper following pulsed neutron and electron irradiation

Under certain experimental conditions the internal friction in metals can first increase and following prolonged irradiation decrease. Many models have been proposed to account for this ''peaking effect''; however, in many of the cases, no effort is made to distinguish between the influence of interstitials and/or vacancies. To determine the nature of the point defect responsible for the peaking effect in high purity copper, we have performed a series of pulsed irradiations using neutrons and e… more

Date: January 1, 1985

Creator: Simpson, H. M.; Parkin, D. M.; Goldstone, J. A. & Hemsky, J. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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$sup 250$Cm production in a high-flux reactor

No Description Available.

Date: January 1, 1967

Creator: Diamond, H.; Stevens, C. M.; Metta, D. N.; Lerner, J. L. & Kelly, F. R.

Item Type: Report

Partner: UNT Libraries Government Documents Department