Nuclear Cross Sections for 270 Mev Neutrons PDF Download

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Nuclear Cross Sections for 270 Mev Neutrons

Author: James Dejuren
Publisher:
ISBN:
Category : Bismuth
Languages : en
Pages : 12

Book Description

Author: James Dejuren
Publisher:
ISBN:
Category : Bismuth
Languages : en
Pages : 12

Book Description

Capture Cross Sections for Fast Neutrons PDF

Author: D. J. Hughes
Publisher:
ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages : 20

Book Description

The Fission Cross Section of U239 from 0.4 to 1.6 Mev PDF

Author: Benjamin C. Diven
Publisher:
ISBN:
Category : Fission cross sections
Languages : en
Pages : 24

Book Description

Nuclear Cross Sections for 95-Mev Neutrons PDF

Author: James DeJuren
Publisher:
ISBN:
Category : Bismuth
Languages : en
Pages : 24

Book Description
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.