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Sunday, November 1, 2020 | History

2 edition of Cross section measurements for the production of activities by 14-mev neutrons found in the catalog.

Cross section measurements for the production of activities by 14-mev neutrons

Stuart Gordon Forbes

Cross section measurements for the production of activities by 14-mev neutrons

  • 128 Want to read
  • 16 Currently reading

Published .
Written in English

    Subjects:
  • Neutrons.,
  • Nuclear physics.

  • Edition Notes

    Statementby Stuart Gordon Forbes.
    The Physical Object
    Pagination105 leaves, bound :
    Number of Pages105
    ID Numbers
    Open LibraryOL14310802M

    of H is well known. In addition, a transmission measurement near MeV where the cross section of O has a minimum is mostly sensitive to the H cross section. This minimum helps to validate the normalization of the transmission measurement to the total cross section . contributes to development of models and cross-section systematics for (n,2n), (n,p) and (n,a) reactions and satisfies data needs for various applications. A paper has been prepared and submitted for publication on the results from neutron activation cross-section measurements for . Elizabeth Riddle Graves (25 January [citation needed] – 6 January ) was a pioneer in the physics of neutrons and the detection and measurement of fast neutrons. During World War II, she worked in the Metallurgical Laboratory and at the Los Alamos Laboratory, becoming a group leader there after the was probably the highest ranking of the Los Alamos women scientists.


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Cross section measurements for the production of activities by 14-mev neutrons by Stuart Gordon Forbes Download PDF EPUB FB2

Cross section measurements for the production of activities by mev neutronsAuthor: Stuart Gordon Forbes. Ikeda Y., Kumar A., Konno C. () Measurements of Long-Lived Activation Cross Sections by 14 MeV Neutrons at FNS. In: Qaim S.M. (eds) Nuclear Data for Cited by: 7.

The fission cross-sections of U and Pu have been measured at a neutron energy of MeV. A kV accelerator installed on a “low mass” floor at the center of a large laboratory provided a source of 14 MeV neutrons. Fission fragments passing through a limited solid angle aperture were registered on polyester track-etch by: 9.

SUMMARY OF NEUTRON CROSS SECTION MEASUREMENTS FOR 14 Mev TO Mev NEUTRONS. Author(s): Hildebrand, Roger H. Hicks, Donald A. Harker, Wesley H. et al. Main Content Metrics Author & Article Info. Boosting landfill gas production from lignin-containing wastes via termite hindgut microorganism.

Rahimi, Hoda; Sattler, Melanie L Author: Roger H. Hildebrand, Donald A. Hicks, Wesley H. Harker. The new formulae compared with the literature data give a good fit in calculating the (n,p) reaction cross sections at neutron energies near 14 MeV.

14 MeV cross sections for the reactions 59 Co(n,2n) 58m+g Co, 59 Co(n,p) 59 Fe and 59 Co(n,α) 56 Mn were measured relative to the 56 Fe(n,p) 56 Mn reaction employing the activation technique. Accuracies of about 1% were achieved for the (n,α) reaction and 2% for the others.

Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link). The cross sections of Te(n,2n) m Te reaction induced by neutrons around 14 MeV were measured using activation technique and calculated by a previously developed formula.

±69 and ±82 mb at the neutron energies of ± and ± MeV, respectively; these are in good agreement with those published by other workers. Mo(n,2n)99Mo Reaction with 14 MeV Neutrons The nuclear reaction involved in the production of 99Mo with 14 MeV neutrons is a process that can be described as n + 42 Mo.

99 42 Mo + 2n. The cross section of this process has a broad maximum around 14 MeV and a threshold at about 8 MeV (Figure2) [17]. Molecules23, x 3 of Nuclear reactions with 14 MeV neutrons, including measurements of energy spectra, angular distributions, and deductions of reaction mechanism Nuclear reactions with three particles in the final state induced by neutrons and the identification of effects of final state interaction, quasi-free scattering, and charge-dependence of nuclear forces.

The nuclear reaction involved in the production of 99 Mo with 14 MeV neutrons is a process that can be described as n   +   M 42 o →   M 42 99 o   +   2 n.

The cross section of this process has a broad maximum around 14 MeV and a threshold at about 8 MeV (Figure 2). The (n,p) reaction cross sections of 16O in the neutron energy range from to MeV were measured by the activation method.

The gamma-ray counting technique was applied, and the cross. To provide accurate double differential neutron emission cross sections of fusion re­ actor candidate elements at En= 14 MeV, Cross section measurements for the production of activities by 14-mev neutrons book fixed m TOF facility with an NE detector of em diameter was installed in the 85° direction of a pulsed D-T source.

The activation cross sections were measured for 57 elements bombarded with Mev. neutrons from the T 3 (d, n)He 4 reaction. Thirty-eight (n, p), twenty-five (n, α), and thirty-four (n, 2n) reactions resulting in known radioactive products with half-lives between a few seconds and a few days were counting arrangement was calibrated using samples containing standardized.

For the measurement of 14 MeV neutron flux, 63 Cu(n, 2n) 62 Cu and 27 Al(n, p) 27 Mg reactions are most suitable because of their higher threshold energies MeV and MeV respectively. Measurement of γ-ray activities from 62 Cu and 27 Mg is used to measure 14 MeV neutron flux. Neutron-Induced Activation Cross Sections Measurements on Molybdenum Isotopes in the 7–15 MeV Energy Range V.

Semkova 1, R. Nolte2, S. Peneva1, T. Troev 1Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Sofia, Bulgaria 2Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany Abstract.

Activation of Flibe with 14 MeV DT neutrons Axel Klix a, Hidetoshi Nishimura, Akihito Suzuki, An effective production cross section for 7Be was obtained from the experimental data. The irradiations aiming at the measurement of induced activity by impurities.

Around MeV the cross section is nearly constant with energy, and has been measured many times, with most of the recent values in good agreement.

Thus a measurement of this cross section gives a useful check on the validity of other cross sections measured in the same laboratory. The isomeric cross section ratio for the production of the 9.

Neutron Activation Cross Section of Molybdenum Isotopes at MeV The 14 MeV neutron cross section data become im­ measurement of production cross section of "'rnNb through 9"Mo(n, n1P) reaction, and the time sequence (4) for that of "'gNb.

Ar-ray peak at keV in spectra obtained by the. telescope at 0" and the differential neutron production cross sections. Additionally, in the energy range MeV, measurements were performed in smaller energy steps ( MeV) relative to well known cross sections for the reference reaction "Al(n, ~z)'~Na.

Activity measurements were performed using a cm x cm. Despite the often difficult and time-consuming effort of performing experiments with fast (14 MeV) neutrons, these neutrons can offer special insight into nucleus and other materials because of the absence of charge.

14 MeV Neutrons: Physics and Applications explores fast neutrons in basic science and applications to problems in medicine, the envir. The cross-sections of W(n,2n)mW, W(n,2n)mW, Ho(n,2n)mHo, 64Ni(n,alpha)61Fe, Ho(n,alpha)Tb and 51V(n,p)51Ti reactions induced by neutrons around 14 MeV were measured using activation technique and calculated by a.

Neutron Activation Cross Section of Molybdenum Isotopes at MeV The 14 MeV neutron cross section data become im- measurement of production cross section of 97mNb through "Mo(n, n'p) reaction, and the time sequence (4) for that of "gNb.

A g-ray peak at keV in spectra obtained by the. This book reflects the exciting developments in both fundamental nuclear physics and the application of fast neutrons to many practical problems.

The book shows how 14 MeV neutrons are used in materials detection and analysis to effectively inspect large volumes in complex : Hardcover. title = {Measurement of Neutron Reaction Cross Sections between 8 and 14 MeV}, author = {Mannhart, Wolf and Schmidt, Dankwart}, abstractNote = {Cross-section measurements were performed with special emphasis on access to the 'blind spot' in the neutron energy range from 10 to 13 MeV.

The use of a conventional D (d,n) neutron source in combination with TOF measurements of the D (d,np) break. This paper reports 14 MeV neutron induced single-event effects results for a variety of microelectronic devices that include an ADC, operational amplifiers, optocoupler, flash memory, PowerPC microprocessor, SRAM, and SDRAM.

Data were collected to. Nuclear Data for Science and Technology Proceedings of the International Conference Antwerp 6–10 September Measurements of the 14 MeV Fission Cross-Sections for U and Pu. Integral Experiments to Measure the Production Rates. Whatever the often troublesome and time-consuming effort of performing experiments with fast (14 MeV) neutrons, these neutrons can provide specific notion into nucleus and totally different provides because of the absence of value.

14 MeV Neutrons: Physics and Applications explores fast neutrons in main science and functions to points in medicine, the setting, and security.

Reactions used for the activity measurements can be chosen to provide a convenient means for determining the absolute fluence rates of MeV neutrons obtained with 3 H(d,n) 4 He neutron generators over a range of irradiation times from seconds to approximately days.

High purity threshold sensors referenced in this test method are. Nuclear data for production of the therapeutic radionuclides 32P, 64Cu, 67Cu, 89Sr, 90Y and Sm via the (n,p) reaction: evaluation of excitation function and its validation via integral cross-section measurement using a 14 MeV d(Be) neutron source.

Al-Abyad M(1), Spahn I, Sudár S, Morsy M, Comsan MN, Csikai J, Qaim SM, Coenen HH. The investigation of the neutron total cross section & measurement of the nuclear. heavy nuclei (xcm) and of light nuclei (x10 13 cm) are evaluated by R. Gowda et al () used Ramsuaer Model that proposed a new functional.

follows: A MeV neutron flux production, ≥ cm-2 s l in a volume (for irradiation) ≤ dm3, with a low flux gradient. It must also be possible to carry out simple experiments on materials during irradiation (e.g., heating and cooling of specimens).

With the minimum flux required. • Ready for cross section measurement @ 14 MeV - Shorter half lifes - Lower cross sections • Need for investigations for the terrestrial neutron flux, we plan an experimental setup • Measurement of cross sections at higher neutron energies foreseen.

MEASUREMENT OF TRITIUM PRODUCTION IN A SPHERE OF %iD HUtADIATED BY MeV NEUTRONS by. A, Henunendinger, C. ~an, E. Shunk, A, N. Ellis, and J. AUWa ABSTRACT The opecific production of tritium. in mmdiam sphere of %iD ir-radiated by a central source of MeV neutrons has been determined by rnaaouring the.

activity. MeV, the elastic scattering cross sections of these elements decrease and converge around 14 MeV. At 14 MeV, the elastic scattering cross sections of many different elements have a very similar value and no isotope is dominant.

Also at this energy level, the inelastic scattering cross section is about half of the. Abstract The neutron radiative-capture cross section of 76 Ge was measured between and MeV using the activation technique. Germanium samples with the isotopic abundance of ∼ 86% 76 Ge and ∼ 14% 74 Ge used in the 0 νββ searches by the GERDA and Majorana Collaborations were irradiated with monoenergetic neutrons produced at eleven energies via the 3 H (p, n) 3 He, 2 H (d.

Times New Roman MS Pゴシック MS P明朝 MS 明朝 Century 標準デザイン Fusion Neutronics Activity at Osaka University in Measurements of double differential cross sections for charged particle emission reactions by 14 MeV neutrons PowerPoint プレゼンテーション Measurements of secondary gamma-ray production cross.

Measurements of total neutron cross sections for nuclei using fast neutrons of various energies have been previously reported. Several of these used neutrons which were not monoenergetic. However, with the advent of monoenergetic neutrons from the reaction T(d,n)He4, investigations have been reported giving total neutron cross sections at The ICT time-of-flight facility at Lawrence Livermore Laboratory was used to measure the elastic and inelastic differential scattering cross sections of nominally 14 MeV neutrons from targets of Pu, U, U, Pb, Nb, Ni, Al, and C.

measurements. Calculating a value for natural Ytterbium from the given isotope cross sections gives a value of about 6 barns. These values can be found in the ENDEF libraries. Cross sections are of interest because it gives us information on how likely neutrons are to interact with a material.

In nuclear and particle physics, the concept of a neutron cross section is used to express the likelihood of interaction between an incident neutron and a target nucleus.

In conjunction with the neutron flux, it enables the calculation of the reaction rate, for example to derive the thermal power of a nuclear power standard unit for measuring the cross section is the barn, which is.The Neutrons For Science facility •High average flux in the MeV range 3- Activity measurement.

Colloque GANIL, Ion induced reactions • (n,xn) cross-section measurement of actinide is very difficult: – radioactive sample – prompt neutron fission E Measurement of (n,xn) reaction cross sections on UWhen DS86 was released, a number of thermal-neutron activation measurements had been made at various slant ranges at Hiroshima and Nagasaki.

Additional measurements have since been made of thermal-neutron activation of cobalt (Co) and europium (Eu) and, with a different technique, the generation of 36 Cl by thermal neutrons. Those measurements have indicated that the thermal neutrons .