Measurement of gamma-ray production double-differential cross sections for1.5 GeV pi(+) meson incidence on iron

Gamma-ray production double-differential cross sections have been measured for 1.5 GeV pi(+) meson incidence on iron target. Gamma-rays were detected by NE213 liquid scintillators and were separated from neutron events by a t wo-gate integration method. The experimental results were compared with cal culated values by the HETC-KFA2 code that takes account of in-medium effect s. At gamma-ray energies up to 7 MeV, the calculated cross sections agree w ith the experimental data typically within a factor of 2. The measured data were also compared with proton incidence ones. The gamma-ray emission cros s sections: for 1.5 GeV pi(+) meson incidence tend to be larger than those for proton incidence in the energy region above 4 MeV.