E1 and E2 cross sections of the 12C(α,γ)16O reaction at Ecm∼1.4 Mev using pulsed α beams

We have installed a new system to measure the γ‐ray angular distribution of the 12C(α,γ)16O 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(T1) spectrometers to detect a γ‐ray from the reaction with a large S/N ratio, intense pulsed α beams to discriminate true events from neutron induced background with a time‐of‐flight (TOF) method, and the monitoring system of target thickness. We succeeded in removing a background due to neutrons and could clearly detect the γ‐ray from the 12C(α,γ)l6O reaction with high statistics.