STUDIES OF THE NUCLEON-NUCLEUS AND THE NUCLEON-NUCLEON INTERACTIONS USING POLARIZED NEUTRON BEAMS


R.L. Walter, C.R. Howell and W. Tornow

Department of Physics, Duke University, Durham, North Carolina, 27706, U.S.A.
and
Triangle Universities Nuclear Laboratory, Durham, North Carolina, 27706 U.S.A.

The results of four scattering measurements using beams of polarized neutrons are described. Results for the analyzing power Ay(θ) for elastic scattering of neutrons from protons and deuterons are compared to calculations based on the Paris and the Bonn nucleon-nucleon interactions. Deficiencies particularly in the Bonn model are indicated. A nucleon-nucleus potential is derived from σ(θ) and Ay(θ) data for n + 28Si and p + 28Si and the Coulomb correction terms are derived according to two approaches. A Fourier-Bessel expansion is used to investigate the form factors of the terms of the n + 208Pb potential which are necessary to describe σ(θ) and Ay(θ) data from 6 to 10 MeV. The nature of the spin-orbit term is also presented.

KEYWORDS: scattering of polarized neutrons, nucleon-nucleon force, neutron-nucleus interaction, Coulomb correction terms, n + 208Pb potential