Elsevier

Nuclear Physics A

Volume 427, Issue 1, 1 October 1984, Pages 36-60
Nuclear Physics A

The analyzing power for neutron scattering from 9Be at 9 to 17 MeV

https://doi.org/10.1016/0375-9474(84)90137-4Get rights and content

Abstract

Time-of-flight techniques were used to measure the analyzing power for the scattering of neutrons from 9Be at energies from 9 to 17 MeV. Because of the high nuclear density of beryllium, particular attention was paid to finite-geometry and multiple-scattering effects. For representing the data, an unusual method of Legendre-coefficient analysis was used to establish the smooth energy dependence of both the cross section σ(θ) and the analyzing power Ay(θ). Spherical optical-model calculations were able to describe the σ(θ) and Ay(θ) data simultaneously, but only after the introduction of an imaginary spin-orbit potential Ws.o.(r). The geometry of the Ws.o.(r) term was found to be the same as that of the surface-peaked imaginary central potential. Coupledchannels calculations using a quadrupole-deformed rotational model built on the 32 ground state were able to describe inelastic scattering to the 52 and 72 excited states, but also required a Ws.o.r potential.

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    Supported in part by the US Department of Energy.

    Present address: Department of Radiology, Duke University Medical Center, Durham, NC 27710, USA.

    ∗∗

    Present address: Department of Physics, The College of William and Mary, Williamsburg, VA 23185, USA.

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