Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 36: Nuclear Structure and Dynamics I

HK 36.10: Talk

Tuesday, March 17, 2009, 18:45–19:00, H-ZO 40

Effect of spin-spin interactions on polarisation observables from nucleon-nucleus scattering — •Elizabeth Cunningham, Jim Al-Khalili, and Ronald Johnson — University of Surrey, Guildford, U.K.

With the new GSI/FAIR facility currently under construction there is a vital need for nuclear reaction theory calculations to make predictions of observables relevant to the proposed experiments. In order to do this for the exotic nuclear species planned to be created at FAIR, it is necessary to determine accurate optical models to describe nucleon elastic scattering from non-zero target spin, I.

The possible existence of a spin-spin interaction in nucleon-nucleus scattering was first proposed by Feshbach [1] who suggested the inclusion of a spherical I·σ and tensor S₁₂ term into the optical potential. The effects of these terms have since been the subject of much theoretical and experimental interest, but it was not until the work of McAbee [2] that a generalised spin-spin tensor was proposed.

In this work we evaluate the I·σ term within the Distorted Wave Born Approximation and apply it to proton scattering from ¹⁰B, for which relevant IUCF data exist. The effect on spin observables, specifically the polarisation transfer coefficient D_NN will be presented. New insight is obtained into the relationship between the spherical spin-spin interaction and D_NN.

[1] H. Feshbach, Ann. Rev. Nuclear Sci. 8, 49 (1958)

[2] T. L. McAbee et al., Nucl. Phys. A509 (1990) 39