$ΛΛ$-$ΞN$-$ΣΣ$ coupling in $^{~6}_{ΛΛ}$He with the Nijmegen soft-core potentials

Details $ΛΛ$-$ΞN$-$ΣΣ$ coupling in $^{~6}_{ΛΛ}$He with the Nijmegen soft-core potentials $ΛΛ$-$ΞN$-$ΣΣ$ coupling in $^{~6}_{ΛΛ}$He with the Nijmegen soft-core potentials

2004-03-03

arxiv.org/abs/nucl-th/0403016v1

Phys.Rev. C69 (2004) 044301

Physics

Nuclear Physics

Nuclear Theory

18 pages, 4 figures

Scientific paper

10.1103/PhysRevC.69.044301

The $\Lambda\Lambda$-$\Xi N$-$\Sigma\Sigma$ coupling in $^{~6}_{\Lambda\Lambda}$He is studied with the [$\alpha$ + $\Lambda$ + $\Lambda$] + [$\alpha$ + $\Xi$ + $N$] + [$\alpha$ + $\Sigma$ + $\Sigma$] model, where the $\alpha$ particle is assumed as a frozen core. We use the Nijmegen soft-core potentials, NSC97e and NSC97f, for the valence baryon-baryon part, and the phenomenological potentials for the $\alpha-B$ parts ($B$=$N$, $\Lambda$, $\Xi$ and $\Sigma$). We find that the calculated $\Delta B_{\Lambda\Lambda}$ of $^{~6}_{\Lambda\Lambda}$He for NSC97e and NSC97f are, respectively, 0.6 and 0.4 MeV in the full coupled-channel calculation, the results of which are about half in comparison with the experimental data, $\Delta B^{exp}_{\Lambda\Lambda}=1.01\pm0.20^{+0.18}_{-0.11}$ MeV. Characteristics of the $S=-2$ sector in the NSC97 potentials are discussed in detail.

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