Charge-exchange reactions with a secondary triton beam

Abstract

A secondary triton beam from fragmentation of 560-MeV alpha-particles has been used in a high-resolution (t,He-3) charge-exchange experiment at intermediate bombarding energies. The experiment was carried out at the National Superconducting Cyclotron Laboratory using a He-4 beam from the K1200 cyclotron. The radioactive triton beam of (0.5-1.0)x 10(6) particles/s with a mean energy of 350 MeV was produced in a production target of the A1200 fragment separator and transported to the target position of the S800 magnetic spectrometer. Ray-tracing and dispersion matching techniques were employed to detect He-3 particles from the C-12(t,He-3)B-12 reaction near 0 degrees. An energy resolution of Delta E approximate to 160 keV or Delta E/E approximate to 4.6 x 10(-4) (FWHM) was achieved. This is an improvement over our previous results and opens the possibility for studying high-resolution (n,p)-type reactions at intermediate bombarding energies. (C) 1999 Elsevier Science B.V. All rights reserved.