Elsevier

Nuclear Physics A

Volume 275, Issue 2, 10 January 1977, Pages 325-341
Nuclear Physics A

Neutron elastic scattering at 11 MeV and the isospin dependence of the neutron-nucleus optical potential

https://doi.org/10.1016/0375-9474(77)90456-0Get rights and content

Abstract

Elastic scattering of 11 MeV neutrons from Mg, Al, S, Ca, V, Mn, Fe, Co, Ni, Nb, 92,96,98, 100Mo, In, 120Sn, Ho, Ta, 206Pb, Pb and Bi have been measured with the Ohio University tandem Van de Graaff accelerator. The required neutrons were produced by the 2H(d, n)3He reaction. Standard pulsed beam time-of-flight techniques were employed with a multiple detector system which included five large area liquid scintillators and plastic scintillator monitor. Measurements of the incident flux at zero degree were used to normalize the differential cross sections. Energy resolution was approximately 360 keV (FWHM). The measured cross sections were corrected for dead time, detector efficiency, attenuation, multiple scattering, finite geometry, neutron source anisotropy, contaminants and compound elastic contribution. Relative and normalization uncertainties in the measured cross section are 3–5% and approximately 3.5 % respectively. A search for an average set of optical model potential parameters based solely on the measured (n, n) data for the isotopically pure samples and for which inelastic contributions to the elastic data are insignificant yield isopin dependent potential strengths, VR = [47.14−22.50(N−Z)A] MeV and WD = [12.16−2.03(N−Z)A] MeV.

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    Supported in part by a grant from the National Science Foundation.

    ††

    Present address: Fusion Energy Corporation,3684 US Route 1,Princeton, New Jersey 08540.

    †††

    Preseent address: Crocker Nuclear Laboratory, University of California, Davis, California 95616.

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