Neutron Resonances in the kev Region: Differential Scattering Cross Sections

Robert C. Block, Willy Haeberli, and Henry W. Newson
Phys. Rev. 109, 1620 – Published 1 March 1958
PDFExport Citation

Abstract

The ratio of the differential elastic neutron scattering cross sections for scattering by 180° and 90°, R=σnn(180°)σnn(90°), has been measured as a function of neutron energy between approximately 30 and 110 kev for F, Na, Mg, Al, K, V, Cr, Cu, Zn, As, Se, Sr, Zr, Nb, Mo, Ag, and Cd. When plotted against atomic weight, the average ratios R¯ (averaged over the energy range of each element) exhibit peaks at A90 and A25, in qualitative agreement with the predictions of the complex square well potential model of the nucleus. However, the experimental ratios are in general larger than those predicted by the theory. Scattering from the lighter elements was also analyzed by single-level resonance theory and resulted in the following assignments: resonance in Al at 88 kev, J=3+; Mg (85 kev), 32; Na (53 kev), 3; F (99 kev), 1; F (49 kev), 1; F (27 kev), 1 or 2. These assignments are in good agreement with those obtained from the latest transmission measurements.

  • Received 4 October 1957

DOI:https://doi.org/10.1103/PhysRev.109.1620

©1958 American Physical Society

Authors & Affiliations

Robert C. Block*, Willy Haeberli, and Henry W. Newson

  • Duke University, Durham, North Carolina

  • *Now at Oak Ridge National Laboratory, Oak Ridge, Tennessee.
  • Now at the University of Wisconsin, Madison, Wisconsin.

References (Subscription Required)

Click to Expand
Issue

Vol. 109, Iss. 5 — March 1958

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Journals Archive

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×