E1 and E2 cross sections of the {sup 12}C({alpha}, {gamma}){sup 16}O reaction at E{sub eff{approx}}1.2 MeV using pulsed {alpha} beams

We have measured the {gamma}-ray angular distribution of the {sup 12}C({alpha}, {gamma}){sup 16}O reaction at the 3.2 MV Pelletron accelerator laboratory at Tokyo Institute of Technology to accurately determine the E1 and E2 cross sections. In this experiment, we used high efficiency anti-Compton NaI(Tl) spectrometers to detect a {gamma}-ray from the reaction with a large S/N ratio, intense pulsed {alpha}-beams to discriminate true events from background events due to neutrons from {sup 13}C({alpha}, n){sup 16}O reaction with a time-of-flight method, and the monitoring system of target thickness. We succeeded in removing a background events due to neutrons and clearly detected the {gamma}-ray from the {sup 12}C({alpha}, {gamma}){sup 16}O reaction with high statistics.