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Author : Hans Albrecht Bethe,R. E. Carter
Publisher : Unknown
Page : 132 pages
File Size : 50,8 Mb
Release : 1955
Category : Cross sections (Nuclear physics)
ISBN : UOM:39015086416297
Author : David T. Goldman
Publisher : Unknown
Page : 680 pages
File Size : 43,9 Mb
Release : 1968
Category : Neutron cross sections
ISBN : UOM:39015003417402
Author : P. B. Hemmig
Publisher : Unknown
Page : 564 pages
File Size : 41,5 Mb
Release : 1966
Category : Neutron cross sections
ISBN : UOM:39015086510446
Author : Felix Bloch,Hans H. Staub
Publisher : Unknown
Page : 74 pages
File Size : 46,6 Mb
Release : 1951
Category : Neutrons
ISBN : UOM:39015086444513
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.
Author : Shimon Yiftah
Publisher : Unknown
Page : 144 pages
File Size : 47,5 Mb
Release : 1960
Category : Fast nuclear reactors
ISBN : UOM:39015001320475
Author : Devereux L. Kavanagh,Charles Earle Mandeville
Publisher : Unknown
Page : 162 pages
File Size : 51,6 Mb
Release : 1958
Category : Neutrons
ISBN : UOM:39015086541250
Author : Lawrence Cranberg,U.S. Atomic Energy Commission
Publisher : Unknown
Page : 58 pages
File Size : 42,5 Mb
Release : 1959
Category : Neutrons
ISBN : UOM:39015086457242
Author : James DeJuren,Norman Knable
Publisher : Unknown
Page : 24 pages
File Size : 51,6 Mb
Release : 1950
Category : Bismuth
ISBN : UOM:39015086448845
The total cross sections of twelve different elements were measured using the neutron beam from the 184-in. cyclotron, operating with deuterons. Bismuth fission ionization chambers were employed as both monitor and detector in conventional 'good geometry' attenuation measurements in the neutron flux emerging from the 3-in. diameter collimating port in the 10-ft-thick concrete shielding. The mean energy of detection of the neutrons in this experiment is estimated to be 95 Mev. Measurements were also made with a monitor and detector placed inside the concrete shielding where an intense neutron flux over a large area could be obtained. Attenuators of four different elements were placed in front of the detector in a 'poor geometry' arrangement so that attenuation was due essentially to inelastic collisions which degrade the neutron energy below the fission threshold. A second detector was placed outside the concrete shielding In the collimated neutron beam in line with the neutron source, absorber, and first detector. Attenuation in it is caused by both inelastic and elastic scattering. By this arrangement the ratio of inelastic to total cross section can be determined directly in one experiment. The nuclear radii as calculated from the observed cross section, using the theory of the transparent nucleus, vary as 1.38 x 10(exp-13) A(exp(1/3)) cm. In this energy range the ratios of the inelastic to total cross sections are all less than one-half.
Author : Conference on Neutron Cross Section Technology
Publisher : Unknown
Page : 576 pages
File Size : 54,9 Mb
Release : 1966
Category : Neutrons
ISBN : CHI:11342128
Author : Gordon Edward Hansen,William H. Roach
Publisher : Unknown
Page : 76 pages
File Size : 41,6 Mb
Release : 1961
Category : Neutron cross sections
ISBN : UOM:39015086497800
Author : Anonim
Publisher : Unknown
Page : 44 pages
File Size : 53,5 Mb
Release : 1956-09
Category : Nuclear physics
ISBN : UOM:39015095067925
Author : Joseph L. Fowler,Cleland H. Johnson,Charles D. Bowman
Publisher : Unknown
Page : 1056 pages
File Size : 45,6 Mb
Release : 1980
Category : Cross sections (Nuclear physics)
ISBN : UOM:39015086414169
Author : Anonim
Publisher : Unknown
Page : 1064 pages
File Size : 49,6 Mb
Release : 1968
Category : Metric system
ISBN : STANFORD:36105130367282
Author : Anonim
Publisher : Unknown
Page : 60 pages
File Size : 43,6 Mb
Release : 1948
Category : Cross sections (Nuclear physics)
ISBN : UOM:39015077308487
Author : Roald A. Schrack,Charles D. Bowman
Publisher : Unknown
Page : 564 pages
File Size : 47,8 Mb
Release : 1975
Category : Cross sections (Nuclear physics)
ISBN : UOM:39015003427112