The Nuclear Sigma Term in the Skyrme Model: Pion-Nucleus Interaction

Details The Nuclear Sigma Term in the Skyrme Model: Pion-Nucleus Interaction The Nuclear Sigma Term in the Skyrme Model: Pion-Nucleus Interaction

1998-02-27

arxiv.org/abs/nucl-th/9802085v1

Phys.Rev.C57:2830-2838,1998

Physics

Nuclear Physics

Nuclear Theory

16 pages (latex), 3 figures (eps), e-mail: gammal@if.usp.br and tobias@ita.cta.br

Scientific paper

10.1103/PhysRevC.57.2830

The nuclear sigma term is calculated including the nuclear matrix element of the derivative of the NN interaction with respect to the quark mass, $m_q\frac{\partial V_{NN}}{\partial m_q}$. The NN potential is evaluated in the skyrmion-skyrmion picture within the quantized product ansatz. The contribution of the NN potential to the nuclear sigma term provides repulsion to the pion-nucleus interaction. The strength of the s-wave pion-nucleus optical potential is estimated including such contribution. The results are consistent with the analysis of the experimental data.

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