A New phenomenological tau-alpha interaction

Heiberg-Andersen, H.; Mackintosh, R.S. and Vaagen, J.S. (2003). A New phenomenological tau-alpha interaction. Nuclear Physics A, 713(1-2) pp. 63–80.

DOI: https://doi.org/10.1016/S0375-9474(02)01291-5

Abstract

We present a potential model, with distinctive features, reproducing angular distributions and analyzing power data for tau-alpha scattering from 20 to 30 MeV energy with regular variation of the parameters. The distinctive features are: (1) a spin-orbit term which incorporates the influence of central depression in the nucleus, and, (2) central terms which are strongly parity dependent. The parity dependence of the real central term is such that the odd-parity component has both a greater rms radius and greater volume integral than the even-parity component. These parity dependence characteristics had been predicted by the inversion of the RGM S-matrix. Our result supports a considerable contribution from three-nucleon exchange processes. The predicted 1/2- level of 7Be is shifted 3 MeV relative to a previous one-level R-matrix formula fit, and depends strongly on the geometry of the spin-orbit potential.

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