Download or read book Fission Spectrum written by Felix Bloch and published by . This book was released on 1951 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of the spectrum of the fission neutrons of 25 are described, in which the energy of the neutrons is determined from the ionization produced by individual hydrogen recoils. The slow neutrons producing fission are obtained by slowing down the fast neutrons from the Be-D reaction of the Stanford cyclotron. In order to distinguish between fission neutrons and the remaining fast cyclotron neutrons both the cyclotron current and the pusle amplifier are modulated. A hollow neutron container, in which slow neutrons have a lifetime of about 2 milliseconds, avoids the use of large distances. This method results in much higher intensities than the usual modulation arrangement. The results show a continuous distribution of neutrons with a rather wide maximum at about 0.8 MV falling off to half of its maximum value at 2.0 MV. The total number of netrons is determined by comparison with the number of fission fragments. The result seems to indicate that only about 30% of the neutrons have energies below .8 MV. Various tests are described which were performed in order to rule out modification of the spectrum by inelastic scattering.
Download or read book Study of Fission Neutron Spectra with High energy Activation Detectors written by J. A. Grundl and published by . This book was released on 1963 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Spectrum of Neutrons from Fissions Induced by Thermal Neutrons written by B. E. Watt and published by . This book was released on 1951 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fission Neutrons written by Nikolay Kornilov and published by Springer. This book was released on 2014-07-25 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although the fission of heavy nuclei was discovered over 75 years ago, many problems and questions still remain to be addressed and answered. The reader will be presented with an old, but persistent problem of this field: The contradiction between Prompt Fission Neutron (PFN) spectra measured with differential (microscopic) experiments and integral (macroscopic and benchmark) experiments (the Micro-Macro problem). The difference in average energy is rather small ~3% but it is stable and we cannot explain the difference due to experimental uncertainties. Can we measure the PFN spectrum with high accuracy? How may we compare results of different experiments to provide better accuracy? Are our traditional theoretical models correct? What can be done to solve the Micro-Macro problem in future? These questions are discussed in this monograph for the reader. The current work will be of interest to graduate students and researchers, particularly those working in nuclear and neutron physics.
Download or read book Inelastic Cross Sections for Fission Spectrum Neutrons written by Hans Albrecht Bethe and published by . This book was released on 1955 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fission Spectrum written by Félix Bloch and published by . This book was released on 1943 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Neutron Spectra from Mock Fission Sources written by Eugene Tochilin and published by . This book was released on 1958 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book FISSION SPECTRUM written by and published by . This book was released on 1943 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of the spectrum of the fission neutrons of 25 are described, in which the energy of the neutrons is determined from the ionization produced by individual hydrogen recoils. The slow neutrons producing fission are obtained by slowing down the fast neutrons from the Be-D reaction of the Stanford cyclotron. In order to distinguish between fission neutrons and the remaining fast cyclotron neutrons both the cyclotron current and the pusle amplifier are modulated. A hollow neutron container, in which slow neutrons have a lifetime of about 2 milliseconds, avoids the use of large distances. This method results in much higher intensities than the usual modulation arrangement. The results show a continuous distribution of neutrons with a rather wide maximum at about 0.8 MV falling off to half of its maximum value at 2.0 MV. The total number of netrons is determined by comparison with the number of fission fragments. The result seems to indicate that only about 30% of the neutrons have energies below .8 MV. Various tests are described which were performed in order to rule out modification of the spectrum by inelastic scattering.
Download or read book New Fission neutron spectrum Representation for ENDF written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A new representation of the prompt fission neutron spectrum is proposed for use in the Evaluated Nuclear Data File (ENDF). The proposal is made because a new theory exists by which the spectrum can be accurately predicted as a function of the fissioning nucleus and its excitation energy. Thus, prompt fission neutron spectra can be calculated for cases where no measurements exist or where measurements are not possible. The mathematical formalism necessary for application of the new theory within ENDF is presented and discussed for neutron-induced fission and spontaneous fission. In the case of neutron-induced fission, expressions are given for the first-chance, second-chance, third-chance, and fourth-chance fission components of the spectrum together with that for the total spectrum. An ENDF format is proposed for the new fission spectrum representation, and an example of the use of the format is given.
Download or read book Fission Neutron Spectrum of U235 from 0 2 to 3 Mev written by Lawrence Cranberg and published by . This book was released on 1955 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Prompt Fission Neutron Spectra written by International Atomic Energy Agency and published by . This book was released on 1972 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fission Product Decay Gamma Energy Spectrum written by John D. Moteff and published by . This book was released on 1953 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Fission Product Decay Chains written by Edward Homer Fleming and published by . This book was released on 1967 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gamma ray Spectra of the Products of Fast Neutron Fission of U235 and U238 at Selected Times After Fission written by Leland R. Bunney and published by . This book was released on 1966 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental measurements of the gamma-ray pulse height distributions due to the products of fast-neutron-induced fission of Uranium-235 and Uranium-238 are presented. The measurements were made at nine selected times after fission from 15 minutes to 3 days. Irradiation times and counting intervals were chosen to minimize saturation and decay effects. The experimental data were used to calculate 100 energy bin distributions of the absolute number of photons/fission-sec. by means of absolute calibrations of the collimated NaI(T1) detector. The number of fissions in each sample was determined radiochemically. Machine computation was used extensively.
Download or read book A Study of the Spectrum of the Neutrons of Low Energy from the Fission of U235 written by T. W. Bonner and published by . This book was released on 1951 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Calculation of the Energy Spectrum of Fission Neutrons written by I. Nebenzahl and published by . This book was released on 1965 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Energy Spectrum of Leakage Neutrons from a Homogeneous Reactor written by R. C. Rohr and published by . This book was released on 1951 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
