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Report No.

Measurement of the E1 and E2 partial cross sections of the $$^{12}$$C($$alpha$$,$$gamma$$)$$^{16}$$O reaction at E$$_{cm}$$ = 1.2 and 1.5 MeV using pulsed $$alpha$$ beam

Makii, Hiroyuki   ; Ueda, Hitoshi*; Nagai, Yasuki*; Segawa, Mariko   ; Temma, Yasuyuki*; Shima, Tatsushi*; Mishima, Kenji*; Igashira, Masayuki*

The $$^{12}$$C($$alpha$$,$$gamma$$)$$^{16}$$O reaction plays an important role in stellar evolution at the stage of He-burning. However the cross section at the stellar temperature still has a large uncertainty mainly due to the poor determination of the cross section ratio, $$sigma_{E2}/sigma_{E1}$$. In order to make a precise measurement of the $$sigma_{E2}/sigma_{E1}$$, we have installed a new measurement system of the $$gamma$$-ray angular distributions of the $$^{12}$$C($$alpha$$,$$gamma$$)$$^{16}$$O reaction. In this experiment, we used high efficiency anti-Compton NaI(Tl) spectrometers to detect $$gamma$$-rays from the reaction with a large S/N ratio, an intense pulsed $$alpha$$ beams, and the monitoring system of the target thickness. With use of the system we succeeded in removing a background due to neutrons and could clearly detect the $$gamma$$-ray from the reaction with high statistics. We determined the E1 and E2 cross section down to E$$_{cm}$$ = 1.2 MeV, and thus obtained results are compared to recent theoretical calculations.



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