Centre d' Etudes Nucleaires, A preliminary study was conducted to determine the amount of fissile material present in a sample. The GCM reproduces well the energy levels of high-spin states as well as the low-lying states. In a parallel effort, we are also investigating various ways of incorporating polarization agents needed for DNP, such as site specific spin labels, into protein crystals. ANISN-PC, a onedimensional, discrete, New model of universal gas-filled neutron tube. In the case of an RFQ accelerator, operating in a pulsed bunched mode, a suitable shutter mechanism can be used to effectively isolate the gas target between beam pulses and thus considerably reduce the gas load on a differentially pumped system whilst still maintaining the target at pressures up to 1.2 bar. The method is based on the shaping of the proton beam to produce a desired neutron spectrum using the {sup 7}Li(p,n) reaction as a neutron source. In the present library, a model proxy was implemented to exchange internal data that is represented in different ways in each layer. The experimental setup was assembled at High-Voltage Laboratory in Barcelona and contained a Marx generator in a cone-cone spark gap configuration. The neutron generator was controlled by the system. The robust design and reasonable cost make the described neutron source a very attractive choice for variety of applications, such as mineral identification, material diagnostics (complementing thermal neutron radiography), and isotope generation. Preliminary tests such as I-V and alpha response were performed and neutron responses at ENF in HANARO research reactor were also addressed. A good agreement of measurement and calculation was found with some deviations in certain energy intervals. Full Text Available The quantum-number projected generator coordinate method (GCM is applied to the neutron-rich Se and Ge isotopes, where the monopole and quadrupole pairing plus quadrupole-quadrupole interaction is employed as an effective interaction. The second library, just recently completed, was prepared for use in air-over-ground environments and is available in a broad-group (46-neutron, 23-photon) energy structure. It is particularly important to train students in actinide chemistry and physics. The response was consistent with the 1 cm dose equivalent response required for the monitor within 34% in the range of 0.025 - 15 Mev. The fast neutron converter, which is vital for fast neutron imaging, is produced with the materials made in China. Also, judicious selection of the energy group structure can help to reduce the sensitivity of the computed responses to the weighting function, at least for a selected set of problems. In early September 1992, an intensive workshop titled 'Neutrons in Biology' was held in Hitachi City by making use of the opportunity of the 4th International Conference on Biophysics and Synchrotron Radiation (BSR92) held in Tsukuba. Aguilar, A. Data on RBE values are presented after single doses and multiple fractions of neutrons and 60 Co-gamma rays on pulmonary metastases. Full Text Available The Ural Center for Neutron Therapy performs combined photon-neutron therapy for cancer patients, by applying an ELLIT-80 gamma unit and a NG-12I neutron generator. 1013/second 14 MeV neutron generator for cancer therapy. What are the high density phases of QCD? It is especially shown that the highest cold-neutron flux is obtainable from the normal D sub 2 source with a radius of about 50 cm, while the normal- and para-H sub 2 sources with radii around 3-4 cm produce maximum cold-neutron fluxes at the center. (author), First demonstration of laser engagement of 1-Hz-injected flying pellets and neutron generation, Komeda, Osamu; Nishimura, Yasuhiko; Mori, Yoshitaka; Hanayama, Ryohei; Ishii, Katsuhiro; Nakayama, Suisei; Kitagawa, Yoneyoshi; Sekine, Takashi; Sato, Nakahiro; Kurita, Takashi; Kawashima, Toshiyuki; Kan, Hirofumi; Nakamura, Naoki; Kondo, Takuya; Fujine, Manabu; Azuma, Hirozumi; Motohiro, Tomoyoshi; Hioki, Tatsumi; Kakeno, Mitsutaka; Sunahara, Atsushi; Sentoku, Yasuhiko; Miura, Eisuke, Pellet injection and repetitive laser illumination are key technologies for realizing inertial fusion energy. This paper describes the design configuration of the shielding components, A shield design using stainless steel (SST), water, boron carbide, lead, and concrete materials was developed for the next-generation tokamak device with superconducting toroidal field (TF) coils and low neutron fluence. Considering the field of fast reactors that meet criteria of fourth generation, ability of models to describe self-shielding phenomenon, to simulate neutrons leakage in a lattice of fuel assemblies and to produce representative macroscopic sections is evaluated. The coalescence of black-hole-neutron-star binaries is expected to be a principal source of gravitational waves for the next generation of detectors, Advanced LIGO and Advanced Virgo. A.; Hammig, M. D.; Krushelnick, K.; Thomas, A. G. R. We demonstrate a repetitive, high flux, short-pulsed laser-driven neutron source using a heavy-water jet target. However, the remarkable development of the recent neutron scattering and its related sciences, as well as the availability of higher flux, has made the biological materials one of the most attractive subjects to be studied by neutrons. ; Greene, N.M.; Moses, D.L. The target unit consists of a set of Tungsten blocks placed inside a wheel of 2.5 m diameter which rotates at some 0.5 Hz in order to distribute the heat generated from incoming protons which reach the target in the radial direction. Neutron spectra and cross sections for ice and clathrate generated from the synthetic spectrum and synthetic model for molecular solids, We present here a Synthetic Model for Molecular Solids, aimed at the description of the interaction of thermal neutrons with this kind of systems.Simple representations of the molecular dynamical modes are used, in order to produce a fair description of neutron scattering kernels and cross sections with a minimum set of input data. Images of metallic plates with different thickness are obtained on commercial radiographic film, Agfa Curix ST-G2, in order to characterize an effective energy of the hard X-ray outside of the discharge. The thermal neutron flux caused by the neutron generator and the graphite structure has been characterised by foil activation, fission chamber and 3 He proportional counter measurements. Parque Tecnolgico Bizkaia. Since the early 1950s the vital multidisciplinary progress in understanding condensed matter is, in a substantial fraction, based on results of neutron scattering experiments. First part of this report enumerates every step of fast reactor's neutronics simulation implemented in current reference code: ECCO. T=80 keV, n D =2x10 20 m -3 , E0 =3 sec and B=6T, the 14 MeV neutron generation rate is reduced by about 20% from the values for Maxwellian plasmas. A, 7B, 48170 Zamudio (Spain); Instituto de Fusin Nuclear, Jos Gutirrez Abascal, 2, 28006 Madrid (Spain); Mancisidor, M.; Aguilar, J.; Bakedano, G.; Herranz, I.; Luna, P. [Consorcio ESS-BILBAO. The unique feature of this reference design is that a majority of the bulk steel in the shield is in the form of spherical balls with two small, flat spots. Clearly, with such relatively low applied voltage the electrons are unable to accelerate to the energies required for photo/electro disintegration. After an initial feasibility study, a prototype logging probe was built for field evaluation which began in January 1976. ; Tapper, U.A.S. This provides an approach of polarizing neutrons. A.; Kozlovskiy, K. I.; Nesterovich, A. V.; Senyukov, V. A.; Shikanov, A. E. The paper deals with application features of borehole neutron generator (BNG) based on the vacuum accelerating tube (AT) with laser-plasma ion source for determination of oxygen isotope 16O and carbon isotope 12C by direct activation. Numerical results are given to verify the present. Development of a system for simultaneously generating triple extreme conditions for neutron scattering experiments, Ichimura, Shigeju [Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Med. 7 refs., 3 tabs, Neutron lifetime well logging methods and apparatus, A method for investigating the earth formations surrounding a well borehole, comprising the steps of: continuously generating high energy neutrons in the borehole and bombarding the surrounding media with such neutrons to develop a cloud of thermal neutrons therein; modulating the intensity of said high energy neutrons harmonically as a function of time in order to intensity modulate said cloud of thermal neutrons as a function of time; and measuring a time-dependant thermal neutron characteristic of said intensity modulated cloud of thermal neutrons, Long distance elementary measurement of the radiation dose ratio produced by neutron activation, Zhou Changgeng; Lou Benchao; Wu Chunlei; Hu Yonghong; Li Yan, The working principle and the structure and performances of a long distance controllable individual radiation dose ratio instrument are described. MACS of {sup 181}Ta(n,) at kT=30 keV measured by the activation technique. Thermal analysis was performed for a titanium drive-in target of a D-D neutron generator. These neutron fields are very different, not only in their spectra but also in their fluences. All these enable an effective and low-cost method of killing anthrax spores. Neutron bursts from long laboratory sparks. Nuclear Engineering Division; Smith, M. A. The package includes: - spectral code TVS-M; - 2-D fine mesh diffusion code PERMAK-A for 4- or 6-group calculation of WWER core burnup; - 3-D coarse mesh diffusion code BIPR-7A for 2-group calculations of quasi-stationary WWERs regimes. The absorption cross sections very little influence. War Reserve NGs produced at SNL/NM were in bonded stores by October 1999. FY16 Status Report on NEAMS Neutronics Activities, Lee, C. H. [Argonne National Lab. A compact neutron beam generator system designed for prompt gamma nuclear activation analysis. (author), Experimental evidence for an associated defect model for the neutron generated As/sub Ga/ center in gallium arsenide, The thermal dependence of EPR spectra of fast neutron irradiated n-type GaAs over the whole 4.2 to 300 K temperature range has been studied using the decomposition of spectra into a quadruplet of four identical Gaussian lines and a Lorentzian singlet. Each radiation source is planned to produce radiation for a maximum of 500 hours per year. (author), Design specification for the European Spallation Source neutron generating target element. BGO detectors (127 mm diameter x 76 mm thick) were found more tolerant to neutron exposure and improved the signal to background ratio for the carbon detection by a factor of 6, compared to 152 x 152 mm NaI(Tl). In the present work multiple-film neutron laminagraphs were generated using direct and indirect exposure techniques, with neutrons in thermal, epithermal, and fast energy ranges, ANALYSIS OF THE EFFICIENCY OF A THERAPEUTIC PROGRAM USING 10.2-MEV FAST NEUTRONS. Monte Carlo calculations using the MCNP code and nuclear cross-section data from the JEFF-3.1.1 and FENDL-2.1 libraries were performed and the results are compared with the experimental results. Kim, S I; Kim, B H; Chang, I; Lee, J I; Kim, J L; Pradhan, A S. Calibration neutron fields have been developed at KAERI (Korea Atomic Energy Research Institute) to study the responses of commonly used neutron survey meters in the presence of fast neutrons of energy around 10 MeV. This is a promising result because a 2.5 MeV D-D neutron generator output >10(13) n s(-1) should be attainable in the near future. This technique is called FNA - Fast Neutron Analysis. Recently, LBNL led an international collaboration to measure thermal neutron capture radiative cross sections and prepared the Evaluated Gamma-ray Activation File (EGAF) in collaboration with the IAEA. Options for a next generation neutron source for neutron scattering based on the projected linac facility at JAERI. Measurement of the proton distributions and simulation of the neutron transport. Apart of it, voltage, currents through both electrodes, and three X-ray detectors were also monitored in sophisticated measuring system. For the case of T + on D 2 , which is relevant to the fusion application, the 14 MeV neutron profiles are presented as a function of system parameters. The elemental analysis of the body is used to study the changes of body composition with aging. (author), Pulsed neutron source and instruments at neutron facility, Teshigawara, Makoto; Aizawa, Kazuya; Suzuki, Jun-ichi; Morii, Yukio; Watanabe, Noboru [Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). The spectral details and the ambient dose equivalent rates of the calibration fields were established, and the responses of six neutron survey meters were evaluated. Nuclear Engineering Division. The equations solved for energy dependent neutron spectrum in the 167 fine-group structure are the B-3 or B-1 approximations to the transport equation. During extended operation, its advantages were discovered: long operating time, fairly stable neutron yield, and simplicity of use and operation. For black hole masses not much larger than the neutron star mass, the tidal disruption of the neutron star by the black hole provides one avenue for generating an electromagnetic counterpart. The system consists of (252)Cf fission neutron source, a moderator/reflector/filter assembly, and a suitable enclosure to delimit the resulting neutron beam. Neutron spectral information is present in the pulse height spectrum. During fractional radiation, the RBE factor of neutron radiation was 3.05. Our plan is to develop a custom Dynamic Nuclear Polarization (DNP) setup tailored to neutron protein diffraction instruments. Poligono Ugaldeguren III, Pol. The preliminary results are given of some clinical trials in Amsterdam. The description for this milestone is, 'Demonstrate level set free surface tracking capabilities in ARIA to simulate the dynamics of the formation and time evolution of a weld pool in laser welding applications for neutron generator production'. The selection of the specific group structures and weighting functions was an important part of the generation of both libraries, Next Generation Neutron Scintillators Based On Semiconductor Nanostructures. ; Alves Filho, Hermes; Barros, Ricardo C., E-mail: lrcmoraes@iprj.uerj.br, E-mail: halves@iprj.uerj.br, E-mail: ricardob@iprj.uerj.br [Universidade do Estado do Rio de Janeiro (UERJ), Nova Friburgo, RJ (Brazil). ; White, J.E. Calculations of the scattering cross section are carried out for cold neutrons and thin film rings from type-II superconductors with the magnetic fields not exceeding the first critical field. This distinguished panel concluded that steady state and pulsed sources are complementary and that the nation has need for both to maintain a balanced neutron research program. In Japan, a research and development project for constructing an advanced anti-personnel landmine detection system by using IECF, which is effective not only for metal landmines but also for plastic ones, is now in progress. A maximum neutron energy obtained in the reaction D(d,n) 3 He would be 8.1 MeV with the spread of 750 keV. Measurement of the Maxwellian-Averaged Cross-Section (MACS) of the {sup 181}Ta(n,) reaction at kT=30 keV by the activation technique using an innovative method for the generation of Maxwellian neutron spectra is presented. The workshop was organized by volunteers who are eager to develop the researches in this field in Japan. The analyses of a BWR-RIA and a PWR-RIA have been carried out with a three-dimensional thermal-hydraulic and neutronic model for the coupled system TRACE-PARCS and RELAP-PARCS. For film densities from 1.8 to 3.0, exposures range from 1.9x10 7 to 3.8x10 8 n/cm 2 depending on the type of screen and film, Polarizing neutron by light-irradiated graphene, We study the spin orientation of the neutron scattered by light-irradiated graphene and calculate the average value of spin z-component of the neutron in terms of a generating functional technique. Optimization of the beam shaping assembly in the D-D neutron generators-based BNCT using the response matrix method. Majority of tritium (68%) is released within a temperature range from 800 to 920 degC. A system is subcritical when the removal by absorption and leakage exceeds the production by fission and tends to shut down. The main lines are: 6.13 for O, 4.43 for C, and 5.11, 2.31 and 1.64 MeV for N. Accelerator-generated neutrons in the energy range of 7 to 15 MeV are being considered as interrogating radiations in a variety of non-intrusive inspection systems for contraband, from explosives to drugs and from coal to smuggled, dutiable goods. The element is capable of holding an electrostatic charge and comprises a first layer for absorbing neutrons and generating a current by dissipation of said electrostatic charge in proportion to the number of neutrons absorbed, and a second layer for conducting the current generated by the absorbed neutrons, said neutron absorbing layer comprising an insulative layer comprising neutron absorbing agents in a concentration of at least 10 17 atoms per cm 3 . Summary of the presentation is: (1) A light weight simple form factor compact neutron energy spectrometer ready to be used in maritime missions has been built; (2) Under laboratory conditions, individual Single Neutron Source Identification is possible within 30 minutes. We investigate the causes of depletion of lean body mass and the development of ways of maintaining functional capacity and quality of life of the elderly. ; Bolshagin, S.N. THE EXPERIENCE OF THE URAL CENTER FOR NEUTRON THERAPY. Speed-2 consists on 40 +/- Marx modules connected in parallel (4.1 {mu}F equivalent Marx generator capacity, 300 kV, 4 MA in short circuit, 187 kJ, 400 ns rise time, dI/dt {approx} 10{sup 13} A/s). The libraries include temperature dependent data, resonance cross sections represented by subgroup parameters and may contain photon as well as neutron data. )), Mukaiyama, Takehiko [Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Neutron and gamma rays transport calculations have been performed using the Monte Carlo N-Particle transport code (MCNP5). The size of the sampling is determined by the characteristics of the tolerance intervals by applying the NoetherWilks formulas. The badge-like dosemeter contains 5 detectors: polycarbonate foil (10 m, Makrofol KG), 232 Th, natural uranium, natural uranium with boron, and natural uranium with cadmium. A rotating seal concept was applied to reduce the gas load in a differentially pumped system. Results show good agreement between direct calculation and the RM method. -- Author-Highlights: Generation of Maxwellian neutron spectrum for astrophysics and nuclear data validation. All rights reserved. The MACS of the reaction {sup 197}Au(n,) provided by KADoNiS has been used as a reference. From these data some remarks about the future of neutron therapy are made. Neutron kinetics in moderators and SNM detection through epithermal-neutron-induced fissions, Gozani, Tsahi, E-mail: tgmaven@gmail.com [1050 Harriet St., Palo Alto, CA 94301 (United States); King, Michael J. The maximum neutron production rate of 2.0x10 8 n/s was obtained at a pulsed discharge of -51 kV, 7.3 A, Chem-Prep PZT 95/5 for Neutron Generator Applications: Particle Size Distribution Comparison of Development and Production-Scale Powders. The Author(s) 2017. Currently Speed-2 is operating at CCHEN (Chilean nuclear energy commission), being the most powerful and energetic device for dense transient plasma in the Southern Hemisphere. Hah, J.; Nees, J. Quantitative evaluation of instrument performance with LPSS and SPSS was examined in the intensive discussion, calculations, workshop on this topics with Prof. F. Mezei who stayed at JAERI from October 24 to November 6, 1996. Poligono Ugaldeguren III, Pol. The repetition frequency is 50-60 Hz. Projected neutron yields and distributions are compared to conventional sources, yielding comparable on-target fluxes per discharge, shorter time resolution, larger neutron energies and greater collimation. (U.K.), The effect of helium generation and irradiation temperature on tritium release from neutron irradiated beryllium. LBNL has also developed new, high flux neutron generators and recently opened a 1010 n/s D+D neutron generator experimental facility. It would generate neutrons below 14.6 MeV ( 2 O. It has been suggested that heat deposition in a subsonic channel might create a gas density step which would constitute an attractive gas target type. A quantitative analysis of the figure-of-merit of the specialized instruments for pulsed source operation shows that up to 2 orders of magnitude intensity gains can be achieved in the next decade, with the advent of high power spallation sources. In its present version, TBEAM is applicable to homogeneous and laminated shields of spherical geometry, to collimator apertures of conical shape, and to neutrons emitted by point sources or such plate sources as are used in neutron generators of various types. BIPR-7A materials include comparison with operation data for Dukovany-2 and Loviisa-1 NPPs (WWER-440) and for Balakovo NPP Unit 4 (WWER-1000). The dominant uncertainty is generally with regard to the energy weighting function used to average the pointwise or fine-group data within a single broad group. Two different technical solutions to the problem of generation of mono-energetic fast neutron beams on the gaseous targets are presented here. The detector is set at the center of a cylindrical polyethylene moderator. The radiation dose ratio produced by neutron activation is elementarily measured by using this instrument in the neutron generator hall with high neutron yield. The costs of the move were recovered in just less than five years of NG production at SNL/NM, and the annual savings today (in 1995 dollars) is $47 million. A gated, field ionization ion source using etched electrodes has been developed that produces pulsed ion currents up to 500nA. In reply, one of the authors of the original note presents the results of calculations of beam profiles for 14 MeV neutron beams in a tissue-equivalent phantom, and suggests that the broader profiles are principally caused by the larger probability of side scatter, not by source size. Nordheim self-shielded fine group cross sections for a material having resolved resonance parameters overwrite correspondingly the existing self-shielded fine group cross sections when this option is used. Jr.; Cowgill, D.F. Neutron cross-section data are vital components to strategies for detecting explosives and fissile materials, and these measurements require expertise in chemical separations, actinide target preparation, nuclear spectroscopy, and analytical chemistry. ; Menlove, H.O. We performed an independent laboratory experiment on long sparks with the aim to confirm or disprove the neutron emission from them. Cosmic ray induced neutron production (ship effect), (a, n) reactions); (3) Determine the efficiency as a function of neutron energy (response function) of each of the detectors, and thereby obtain the composite neutron energy spectrum from the detector count rates; and (4) Far-field data characterization and effectively discerning shielded fission source. ; Govender, K.; Guzek, J.; Beer, A. de; Tapper, U.A.S. The verification materials demonstrate rather good accuracy of calculations obtained with the use of code package of the 3 -d generation. Poligono Ugaldeguren III, Pol. Qualitative relationships between slowing-down time after the pulse and the prevailing neutron energy are discussed. (author), COMBINE7.1 - A Portable ENDF/B-VII.0 Based Neutron Spectrum and Cross-Section Generation Program, COMBINE7.1 is a FORTRAN 90 computer code that generates multigroup neutron constants for use in the deterministic diffusion and transport theory neutronics analysis. The energy and the averaged current obtained by the proton accelerator are 1.5 GeV and 4-5.3 mA, respectively and these provide 6-8 MW power. The second part of this thesis is dedicated to the simulation of fast reactors' core with steel reflector. Carbon and oxygen are detected in vivo by counting the 4.44 and 6.13 MeV gamma rays resulting from the inelastic scattering of the fast neutrons.
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