Separated 1.17-Bev/c K− Meson Beam

Abstract

This report describes the design and testing of a 1.17‐Bev/c separated K⁻ beam designed in the fall of 1958 in connection with a 15‐in. hydrogen bubble chamber experiment. At the target the K⁻/π⁻ ratio was 1/140. At the chamber, 4.0 K⁻‐meson decay lengths from the target, and after two stages of electromagnetic separation, the K⁻/π⁻ ratio was 12.5, corresponding to a total pion suppression by a factor of about 10⁵. The K⁻ flux at the chamber was 0.87 K⁻ mesons per 10¹⁰ protons impinging on the target.