報(bào)告題目：Measurement of the ¹²C+¹⁶O fusion cross sections at stellar energies 

　　報(bào)告人：方曉 （中山大學(xué)） 

　　時(shí)間安排：2017年5月12日 10：00         

　　地點(diǎn)：近代物理所工藝樓6樓會(huì)議室 

　　Abstract： Carbon burning and oxygen burning in massive stars are important burning phases in late stellar evolution following helium burning. The critical reactions are the ¹²C+¹²C, ¹²C+¹⁶O and ¹⁶O+¹⁶O fusion processes. Recent studies showed that the ¹²C+¹⁶O rate has an unusually large effect on the calcium and sulfur yields in type Ia SN, e.g., the higher ¹²C+¹⁶O rate suppresses the alpha-particle abundance, which in turn decreases the M_Ca/M_S ratio. The cross sections of the ¹²C+¹⁶O fusion reaction have been measured at stellar energies to investigate the role of this reaction during late stellar evolution burning phases. Protons and gamma rays were simultaneously measured using silicon and Ge detectors. Statistical model calculations were employed to interpret the experimental results to provide total cross sections. This work provided a more reliable extrapolation for the ¹²C+¹⁶O fusion cross sections to low energies, reducing substantially the uncertainty for stellar model simulations.