The radiative decay K+→π+π0γ (Kπ2γ​) has
been measured with stopped positive kaons. A Kπ2γ​ sample
containing 4k events was analyzed, and the Kπ2γ​ branching ratio
of the direct photon emission process was determined to be [6.1±2.5(stat)±1.9(syst)]×10−6. No interference pattern with internal
bremsstrahlung was observed.Comment: 12 pages, 6 figures, 2 tables, to be published in Phys. Lett.