Exchange Currents for Hypernuclear Magnetic Moments

Abstract

The meson(K and $\pi$) exchange currents for the hypernuclear magnetic moments are calculated using the effective Lagrangian method. The seagull diagram, the mesonic diagram and the ${\Sigma }^0$-excitation diagram are considered. The $\Lambda$-N exchange magnetic moments for the ${}_{\Lambda }^{5}He$, ${}_{\Lambda }^{6}He$ and ${}_{\Lambda }^{6}Li$ are calculated employing the harmonic oscillator shell model. It is found that the two-body correction is about -9% of the single particle value for ${}_{\Lambda }^{5}He$. The $\pi$ exchange current, induced only in the ${\Sigma }^0$-excitation diagram, is found to give dominant contribution for the isovector magnetic moments of hypernuclei with A=6.

Comments: 11pp, LaTeX, 7 EPS figures, uses epsf.sty