R. Rameika

Electron identification using a synchrotron radiation detector

Abstract A xenon filled multiwire proportional chamber was used to detect synchrotron radiation from high energy electrons traversing the field of a standard spectrometer magnet. Signals from the chamber were used to achieve an electron trigger with a pion rejection of ∼ 17 and an average electron detection efficiency of 81%. Off-line analysis of the chamber signals increased the pion rejection to 59 with an electron efficiency of 77%.

Polarization of inclusively produced hyperons

We report here polarization results from a series of Fermilab experiments from the years 1974 through 1980, with some preliminary data from a high pT polarization experiment completed in February 1982. The Λ polarization has a remarkably simple and interesting behavior when expressed as a function of xF and pT.

Magnetic moments of charged hyperons

Measurements of the magnetic moments of the Ξ−, Σ+ and Σ− baryons are presented. The values found are μΞ−=−.69±.04, μΣ+=2.31±.027 and μΣ−=−.89±.14, in units μN. The Ξ− and Σ− results are final, while the Σ+ value is based on a preliminary analysis of about 22% of the data sample.

New Measurements of Hyperon Magnetic and Electric Dipole Moments

Measurements of the magnetic moments of the Λ, Ξ°, Ξ-, Σ+, and Σ-hyperons have been made or are under analysis by the neutral/charged hyperon beam group at Fermi National Accelerator Laboratory. Results to date give μΛ = -.6138±.0047 n.m., μΞ° = -1.253±.014 n.m., and μΞ- = -.75±.06 n.m.. The electric dipole moment of the A has also been measured to be dΛ = (-3.0±7.4)×10-17 e-cm.