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Structure des ions lourds et nucléosynthèse dans les étoiles massives : la réaction 12C + 12C

Abstract : The 12C+ 12C fusion reaction plays a key role in the late evolution of massive stars. Its cross section exhibits strong resonances down to the astrophysical region of interest, often associated with a molecular configuration of the 24Mg nucleus. In this thesis, the 12C+ 12C fusion cross section has been measured from the Coulomb barrier down to the astrophysical region of interest. The charged particle-gamma coincidence technique has been used. A new experimental setup, STELLA, has been developed and built during this thesis. It is composed of a reaction chamber, a set of annular silicon strip detectors, a rotating target mechanism, an ultra high vacuum system, a digital time-stamped data acquistion system, and a structure that fits 36 LaBr3 detectors. STELLA has been installed at the Andromède facility (Orsay, France). Successfull experiments have been carried out to extract fusion cross sections down to the Gamow window for the carbon burning phase of massive stars.
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Guillaume Fruet. Structure des ions lourds et nucléosynthèse dans les étoiles massives : la réaction 12C + 12C. Autre. Université de Strasbourg, 2018. Français. ⟨NNT : 2018STRAE017⟩. ⟨tel-02107569⟩

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