Abstract
A new type of beam collector for light secondary charged particles (“Large ω” beam course) was designed and constructed at the RIKEN Ring Cyclotron (RRC). It makes use of the focusing properties of an axially symmetric magnetic field produced by three short superconducting coils. The system sees the target at right angles to the primary beam, and covers a solid angle of about 600 msr. It has been used mainly to transport surface muons from the decay of pions produced in nucleus-nucleus collisions. The large collection efficiency of surface muons by this collector helped us to obtain valuable data on the production cross section of low-energy pions (below 10 MeV) in reactions of 135 MeV/u 14N beam with various target nuclei. Its future development will also be discussed.
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