Fast-neutron Scattering from Tantalum, Rhenium, and Platinum
Fast-neutron Scattering from Tantalum, Rhenium, and Platinum

Author:

Publisher:

Published: 1967

Total Pages: 58

ISBN-13:

DOWNLOAD EBOOK

The scattering of neutrons with energies of less than or approximately 1.5 MeV from tantalum, rhenium, and platinum was studied experimentally. Elastic and inelastic neutron-scattering angular distributions were determined at incident neutron-energy intervals of less than or approximately 20 keV throughout th range 0.3 to 1.5 MeV. Time-of-flight measurements were made concurrently at eight or more scattering angles between 25 and 155 degrees with sufficient scattered neutron-energy resolution to separate the elastic scattered component from most inelastic scattered neutron groups. Differential inelastic scattering cross sections were observed corresponding to the excitation of various states. The experimental results were compared with calculations based upon the optical model and the Hauser-Feshbach formula inclusive of corrections for resonance-width fluctuations. The experimentally observed level structure is discussed in the context of single-particle and rotational states of deformed nuclei.

Scientific and Technical Aerospace Reports
Scientific and Technical Aerospace Reports

Author:

Publisher:

Published: 1972

Total Pages: 892

ISBN-13:

DOWNLOAD EBOOK

Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

The Effect of Nuclear Radiation on Structural Metals
The Effect of Nuclear Radiation on Structural Metals

Author: Frederic R. Shober

Publisher:

Published: 1961

Total Pages: 120

ISBN-13:

DOWNLOAD EBOOK

The effect of fast-neutron (>1 Mev) irradiation on the mechanical properties of structural metals and alloys was studied. Although the yield strengths and ultimate tensile strengths are increased su stantially for most materials, the ductility suffers severe decreases. This report presents these changes in properties of several structural metals for a number of neutron exposures within the 1.0 x 10 to the 18th power to 5.0 x 10 to the 21st power n/sq cm range. Data summarizing these effects on several classes of materials such as carbon steels, low-alloy steels, stainless steels, Zr-base alloys, ni-base alloys, Al-base alloys, and Ta are given. Additional data which show the influence f irradiation temperatures and of post-irradiation annealing on the radiation-induced property changes are also given and discussed. Increases as great as 175% in yield strength, 100% in ultimate strength, and decreases of 80% in total elongation are reported for fast-neutron exposures as great as 5 10 to the 21st power n/sq cm. (Author).