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$$E1$$ and $$E2$$ cross sections of the $$^{12}$$C$$(alpha,gamma_{0})^{16}$$O reaction using pulsed $$alpha$$ beams

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

We measured the $$gamma$$-ray angular distribution from $$^{12}$$C$$(alpha,gamma_{0})^{16}$$O to the ground state of $$^{16}$$O using a pulsed $$alpha$$ beam at $$E_{rm eff} = 1.6$$ and 1.4 MeV. True events of $$^{12}$$C$$(alpha,gamma_{0})^{16}$$O were discriminated from background events due to neutrons from $$^{13}$$C($$alpha,n$$)$$^{16}$$O with a time-of-flight method. The obtained $$gamma$$-ray spectrum with anti-Compton NaI(Tl) spectrometers showed a characteristic line shape from $$^{12}$$C$$(alpha,gamma_{0})^{16}$$O: the Doppler broadening and energy loss of $$alpha$$ particles in $$^{12}$$C targets. The astrophysical S factors for $$E1$$ and $$E2$$, $$S_{E1}(gamma_{0}:E_{rm eff})$$ and $$S_{E2}(gamma_{0}:E_{rm eff})$$, derived from the present cross sections are in excellent agreement with the values derived by $$R$$-matrix calculation of the $$beta$$-delayed $$alpha$$ spectrum of $$^{16}$$N, and by using the asymptotic normalization constant in the $$R$$-matrix fit.

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Category:Physics, Nuclear

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