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Thursday, July 30, 2020 | History

2 edition of Review and combination of experimental results for neutron emission per fission of 232Th found in the catalog.

Review and combination of experimental results for neutron emission per fission of 232Th

R. Gwin

Review and combination of experimental results for neutron emission per fission of 232Th

by R. Gwin

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Published by Dept. of Energy, Office of Energy Technology, National Laboratory, Neutron Physics Division, for sale by the National Technical Information Service in Oak Ridge, Tenn, Springfield, Va .
Written in English

    Subjects:
  • Neutrons.

  • Edition Notes

    StatementR. Gwin.
    SeriesORNL/TM ; 6245, ORNL/TM -- 6245.
    ContributionsOak Ridge National Laboratory. Neutron Physics Division.
    The Physical Object
    Paginationiii, 15 p. :
    Number of Pages15
    ID Numbers
    Open LibraryOL17648211M

    Impact of neutron multiplicity correction on fission fragment yield Experimental evidence of higher neutron multiplicity for heavy fragments Theoretically understood by so-called energy sorting (light fragment hotter but in contact with heavy one)-> energy transfer to heavy one -> more neutron emission-> Impact on post neutron yields % File Size: 3MB. neutron emission 9 Figure 4. Delayed neutron emission in neighboring decay chains 11 Figure 5. TRISTAN layout of the ALRR 13 Figure 6. Fission product generator 14 Figure 7. Long counter neutron detector 19 Figure 8. Schematic of neutron detection electronics 20 Figure 9. Group delayed neutron spectra 26 Figure ^He cross sections

    Th Fast Neutron Fission (Beta) JENDL JNDC-V2 Beta Ratio (C/E) 10 Th Fast Neutron Fission (Gamma) YAYOI JENDL JNDC-V2 f(t) x t (MeV/fission) Time after fission burst (s) 10 Th Fast Neutron Fission (Gamma) JENDL JNDC-V2 Gamma Ratio (C/E) Time after. Abstract: We propose to produce neutron-rich nuclei in the range of the astrophysical r-process around the waiting point N= by fissioning a dense laser-accelerated thorium ion bunch in a thorium target (covered by a CH2 layer), where the light fission fragments of the beam fuse with the light fission fragments of the target. Via the 'hole-boring' mode of laser Radiation Pressure Cited by:

    Experimental determination of neutron Fermi age from Cf fission spectrum to Cd covered indium resonance in a graphite medium (Technical report - Laboratories, University of Texas at Austin) [Nichols, Steven Parks] on *FREE* shipping on qualifying offers. Experimental determination of neutron Fermi age from Cf fission spectrum to Cd covered indium resonance in Author: Steven Parks Nichols. Further information on the mechanism of neutron emission from the highly excited fission fragments may be gained from the measurement of energy correlations of these neutrons, which is the subject of the present investigation. 1. 1 THE EVAPORATION MODEL ANO THE cf SPECTRUM.


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Review and combination of experimental results for neutron emission per fission of 232Th by R. Gwin Download PDF EPUB FB2

Get this from a library. Review and combination of experimental results for neutron emission per fission of Th. [R Gwin; Oak Ridge National Laboratory. Neutron Physics Division.]. The results for the prompt neutron multiplicity, ν (A), the neutron energy, ε (A), as a function of fission fragment mass A and total kinetic energy (TKE), ν (TKE) are compared with available experimental data for the spontaneous fission of Cf,Cm and thermal neutron induced fission of U.

Several problems connected with the Cited by: The prompt neutron emission in spontaneous fission of Cf has been investigated applying digital signal electronics. The goal was to compare the results of this digital data acquisition and. Excitation functions for inelastic neutron scattering from the keV, the keV, and the – MeV levels in Th have been measured in the energy range – MeV.

The experimental results show that the structure in the fission cross section of Th near the fission threshold cannot be adequately interpreted in terms of competition between fission and neutron by: 7.

The preliminary results of experimental data analysis on neutron production in the thin and thick lead targets induced by protons are discussed here. A comparison of the measured neutron production double-differential cross section with the data of KEK, for and GeV, and ITEP, for GeV and GeV, is shown in Figure : Vladimir Yurevich.

The results are used in parallel with the measurements of fast-neutron induced fission of \(^{}\)U and spontaneous fission of \(^{}\)Cf to assess the potential of such reactions and. Nuclear fission, discovered in [], provides one of the most dramatic examples of a nuclear decay, whereby the nucleus splits preferentially into two smaller fragments releasing a large amount of n is a unique tool for probing the nuclear potential-energy landscape and its evolution, as a function of elongation, mass asymmetry, spin, and excitation energy, from the single Cited by: prompt neutron spectra both the shape and the average multiplicity.

• Also, the calculated energy spectra for fixed angles agree rather well with experimentally obtained ones. • There is a minor distinction which is that the calculation (A 2 = 0) gives overestimated value of fission neutron yield as compared with experimental data.

Results. In low-energy fission (spontaneous fission, thermal neutron induced fission) the distribution of total neutron emission numbers is Gaussian-like, with centers at the average neutron multiplicity.

Very early in the history of fission research it was remarked that the Gaussians are universal, i.e. identical. A survey of theoretical representations of two of the observables in neutron emission in fission is given, namely, the prompt fission neutron spectrum N(E) and the average prompt neutron multiplicity {bar {nu}}{sub p}.

Early representations of the two observables are presented and their deficiencies are discussed. This is followed by summaries and some examples of recent theoretical models for Cited by: 8. 21 Summary and Conclusions Correlations between properties of fission fragment and prompt neutrons has been studied in U(n,f) induced by resonance neutrons at GELINA.

The TKE dependence of the number of neutrons emitted per fission shows an inverse slope dTKE/dν ~35% smaller than observed in studies of thermal neutron induced fission. STUDY OF SPONTANEOUS FISSION OF CF: STRUCTURE OF NEUTRON-RICH NUCLEI, GAMMA-RAY ANGULAR CORRELATION AND G-FACTOR MEASUREMENTS By Ke Li Dissertation Submitted to the Faculty of the Graduate School of Vanderbilt University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY in Physics May, Nashville File Size: 1MB.

The paper discusses two techniques for studying the multiplicity spectrum of neutron emission in cold fusion experiments. In the first method the multiplicity distribution of counts in 20 ms time intervals is analysed to give information about the statistics of neutron emission in cold fusion.

The results of six such experiments indicate that File Size: KB. Spontaneous fission (SF) is a form of radioactive decay that is found only in very heavy chemical nuclear binding energy of the elements reaches its maximum at an atomic mass number of about 56; spontaneous breakdown into smaller nuclei and a few isolated nuclear particles becomes possible at greater atomic mass numbers.

The time of prompt-fission-neutron emission from Cf is evaluated at τ0≥(1−2)×10−19 s by measuring a two-neutron correlation function. The final-state interaction of identical neutrons emitted by moving fission fragments is taken into : Yu. Katarzhnov, V.

Nedopekin, V. Rogov, S. Sukhorukov. 6 Assuming two day irradiations per month, 1 gram Ra target, average cross-section of 2 barns over the to MeV range, and average neutron flux of 10 12 n/s/cm 2 over the same energy range produces 52 GBq ( Ci) of Ra or 44 GBq ( Ci) of Ac per by:   The fission phenomena produced by protons of about MeV, have been studied, in a number of nuclei (U,Th,Bi,W and natural silver), by means of loaded, low-sensitivity, nuclear emulsions.

A significant improvement was obtained in the knowledge of the relative cross-sections (Table I). We have studied, for U and Th, the angular distribution, with particular regard given Cited by: Calculations of Emission Neutron and Fission Product Yields for Intermediate Nucleon Reactions S.

Yavshits1) and O. Grudzevich2) 1) Khlopin Radium Institute, St. Peterburg, Russia 2) State Technical University, Obninsk, Russia Abstract. We modified and tested our code system MCFx to produce the nuclear data library for : S.

Yavshits, O. Grudzevich. A survey of theoretical representations of two of the observables in neutron emission in fission is given, namely, the prompt fission neutron spectrum N(E) and the average prompt neutron multiplicity {bar {nu}}{sub p}. Early representations of the two observables are presented and their deficiencies are discussed.

This is followed by summaries and some examples of recent theoretical Cited by: 8. on low-energy fission-Methods and results “Improved Fission product yield evaluation methodologies” Issy-les-Moulineaux, France.

Conventional experimental techniques and some “well established” results. Off-line gamma spectroscopy Resolution limited by neutron emission (assumed to.

when a fission reaction started by one neutron releases several neutrons, resulting in the exponential spread of the reaction critical mass the mass at and above which a lump of U is explosive due to its surface area to mass ratio.This procedure is validated with Monte Carlo simulations of the de-excitation of the fission fragments in a Hauser-Feshbach statistical decay framework.

The derived. is compared with experimental data, when available, and then used to determine the prompt neutron multiplicity.

for the various by: 1.UCRL-AR Simulation of Neutron and Gamma Ray Emission from Fission and Photofission Jer´ ome M. Verbeke, Chris Hagmann, Doug Wrightˆ Lawrence Livermore National Laboratory Janu Contents 1 Introduction 3 2 FREYA 3 3 Spontaneous Fission and Neutron-Induced Fission3File Size: KB.