Kiyomi Ikeda — Page 3

arXiv2001

Relativisitic mean field theory of surface pion condensation in finite nuclei

We study the possible occurrence of surface pion condensation in finite nuclei in the relativistic mean field (RMF) theory. We are led to this conjecture due to the essential role of pions in few-body systems and the recent (p,n) experiments performed at RCNP for spin-isospin excitations of medium and heavy nuclei. We calculate explicitly various N=Z closed shell nuclei with finite pion mean field in the RMF framework and demonstrate the actual occurrence of surface pion condensation.

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arXiv2000

Study for the s-wave in ^{10}Li with analysis of cross-sections

We study the effect of s-wave cross-sections in $^{4}$He+$n$ and $^{9}$Li+$n$ elastic scattering reactions by using the Jost function method (JFM). In $^{5}$He ($^{4}$He+$n$), the s-wave pole of the $S$-matrix does not contribute so much to the total cross-section. On the other hand, in $^{10}$Li ($^{9}$Li+$n$), the s-wave component can not be neglected due to a relatively strong attraction for the s-waves of the core+$n$ potential. It is shown that the $^{9}$Li-$n$ potential, which is microscopically derived by taking into account the pairing-blocking effect for a p-wave neutron, reproduces the s-wave pole close to the $^{9}$Li+$n$ threshold and strongly enhances the s-wave cross-section near the threshold.

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