Elsevier

Nuclear Physics A

Volume 528, Issue 1, 3 June 1991, Pages 159-188
Nuclear Physics A

Depolarization in elastic proton scattering and the nucleon-nucleus spin-spin interaction

https://doi.org/10.1016/0375-9474(91)90422-3Get rights and content

Abstract

The depolarization parameter D in proton- 13C elastic scattering at 72 MeV has been measured at 34° ⩽ θc.m. ⩽ 69° with an overall accuracy of (3–4) × 10−3. Significant deviations from D = 1 were observed around 65°. This finding constitutes unambiguous evidence for a nucleon-nucleus spin-spin interaction. The data were fitted by a conventional optical model potential which included a real, spherical spin-spin potential with surface form factor and Vss = 0.7 ± 0.1 MeV. Good description of the data was also obtained by a microscopic calculation which was based on a density dependent, effective interaction and shell model wave-functions. Similar calculations for 9Be, 15N, 29Si and 31P are consistent with recent data. In particular, they explain the large effects observed for 15N.

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  • Cited by (8)

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    1

    Present address: IUCF, Bloomington, IN, USA.

    2

    Present address: TRIUMF, 4004 Wesbrook Mall, Vancouver, B.C. V6T2A3, Canada.

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