Λ0 hyperon polarization in inclusive production by 24 GeV protons on platinum

Current status of the Baryon magnetic moments

A simple quark model with a linear rising scalar confining potential and an additional Coulomb potential is discussed. The eigenvalues of the appropriate Dirac equation are studied with respect to variations of the quark bare mass and to the potential parameters. The model is able to account for the static properties of the nucleon.

Low-energy properties of a relativistic quark model with linear scalar potential

Curvative measurements in nuclear emulsions

Relativistic single-particle states and coulomb energies

The magnetic moment of the Δ-hyperon has been measured by observing the precession of the polarization vector of Δ-particles in a transverse pulsed magnetic field of 20 T (= 200 kG). The hyperons were produced in a polyethylene target by the reaction π−+p→+Δ+K0 at a pion momentum of 1.05 GeV/c; their decays were detected in stacks of nuclear emulsion at a distance of 11 em from the centre of the target. The angular distribution of the decay products in the rest frame of the Δ was used to determine the direction of the polarization at the time of the decay, and hence the magnetic moment. About 1300 Δ decays have been analysed, giving the result\(\mu _\Lambda = - 0.66\mu _{\mathcal{N}}\) (nuclear magnctons) with a statistical uncertainty of\( \pm 0.06\mu _{\mathcal{N}}\). The systematic error is less then\( \pm 0.03\mu _{\mathcal{N}}\), so that the total (68% confidence level) error is\( \pm 0.07\mu _{\mathcal{N}}\).

C. Busi

Papers

A new measurement of the magnetic moment of the Δ-hyperon