Elsevier

Nuclear Physics A

Volume 334, Issue 2, 4 February 1980, Pages 278-296
Nuclear Physics A

Structural considerations for elastic magnetic electron-nucleus scattering

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Abstract

To explain the form factors obtained by magnetic electron scattering on 17O it is clear that core polarization has to be taken into account. We discuss how this can be done by means of the Hartree-Fock theory. We note that projection from an intrinsic state of definite K gives an incorrect answer for weakly deformed systems such as 17O and we present an alternative procedure for extracting the moments. Using a purely velocity dependent Skyrme interaction (only t0 and t1 are non-zero) a Hartree-Fock calculation is carried out for the seventeen-nucleon system. The calculation leads to a suppression of the M3 form factor. It is emphasized that the suppression arises from the fact that not only is the 16O core deformed, but that spin-up particles have a different deformation than spin-down particles. This arises from the spin dependence of the interaction and from the Pauli principle. A peculiar feature with the interaction that is used is that the M5 form factor gets enhanced. This is attributed to the repulsive velocity dependent term in the interaction. The origin of the velocity dependence is discussed. The effect of the velocity dependence on the magnetic moment operator is also considered.

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Present address: Group L6, Los Alamos Scientific Laboratory, Los Alamos, New Mexico, 87545.

††

Supported in part by the National Science Foundation.

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