Exchange Currents for Hypernuclear Magnetic Moments
نویسندگان
چکیده
The meson(K and π) exchange currents for the hypernuclear magnetic moments are calculated using the effective Lagrangian method. The seagull diagram, the mesonic diagram and the Σ-excitation diagram are considered. The Λ-N exchange magnetic moments for the 5ΛHe, 6 ΛHe and 6 ΛLi 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 5ΛHe. The π exchange current, induced only in the Σ-excitation diagram, is found to give dominant contribution for the isovector magnetic moments of hypernuclei with A=6.
منابع مشابه
Magnetic moment formation in graphene detected by scattering of pure spin currents.
Hydrogen adatoms are shown to generate magnetic moments inside single layer graphene. Spin transport measurements on graphene spin valves exhibit a dip in the nonlocal spin signal as a function of the applied magnetic field, which is due to scattering (relaxation) of pure spin currents by exchange coupling to the magnetic moments. Furthermore, Hanle spin precession measurements indicate the pre...
متن کاملLetter of Intent Hypernuclei with Stable Heavy Ion Beam and RI-beam Induced Reactions at GSI (HypHI) Hypernuclear Magnetic Moments and Exotic Hypernuclei
In order to understand baryon-baryon interactions under flavored SU(3), one must investigate the interaction between nucleons and hyperons, which can be accessed so far mainly by studying hypernuclei. Since hyperons are expected to be one of the main ingredients of neutron dense matter such as neutron stars, understanding the interaction including hyperons is essential to understand our univers...
متن کاملMagnetic moments and electromagnetic radii of nucleon and ∆(1232) in an extended GBE model
We derive the exchange currents of pseudoscalar, vector, and scalar mesons from Feynman diagrams, and use them to calculate the magnetic form factors of nucleon and ∆(1232). The magnetic moments and electromagnetic radii are obtained by using those form factors and the parameters determined from the masses of nucleon and ∆(1232). We find the magnetic moments and electromagnetic radii of nucleon...
متن کاملCurrent-induced switching of domains in magnetic multilayer devices
Current-induced switching in the orientation of magnetic moments is observed in cobalt/copper/cobalt sandwich structures, for currents flowing perpendicularly through the layers. Magnetic domains in adjacent cobalt layers can be manipulated controllably between stable parallel and antiparallel configurations by applying current pulses of the appropriate sign. The observations are in accord with...
متن کاملExchange Currents in Radiative Hyperon Decays
A short overview of motivations and successes of two-body exchange currents between constituent quarks for electromagnetic hadron observables like charge radii, magnetic and quadrupole moments is given. We then predict and analyze exchange current effects on the radiative decay widths of decuplet hyperons, which are to be measured soon. In our chiral constituent quark model, exchange currents d...
متن کامل