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Study of the 12C+12C fusion reactions near the Gamow energy

T. Spillane·F. Raiola·S. Zeng·H. -W. Becker·C. Bordeanu·L. Gialanella·C. Rolfs·M. Romano·D. Sch"urmann·J. Schweitzer·F. Strieder
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Abstract

The fusion reactions 12C(12C,a)20Ne and 12C(12C,p)23Na have been studied from E = 2.10 to 4.75 MeV by gamma-ray spectroscopy using a C target with ultra-low hydrogen contamination. The deduced astrophysical S(E)* factor exhibits new resonances at E <= 3.0 MeV, in particular a strong resonance at E = 2.14 MeV, which lies at the high-energy tail of the Gamow peak. The resonance increases the present non-resonant reaction rate of the alpha channel by a factor of 5 near T = 8x10^8 K. Due to the resonance structure, extrapolation to the Gamow energy E_G = 1.5 MeV is quite uncertain. An experimental approach based on an underground accelerator placed in a salt mine in combination with a high efficiency detection setup could provide data over the full E_G energy range.

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T. Spillane, F. Raiola, S. Zeng, H. -W. Becker, C. Bordeanu, L. Gialanella, C. Rolfs, M. Romano, D. Sch"urmann, J. Schweitzer, F. Strieder. 2007-02-09. Study of the 12C+12C fusion reactions near the Gamow energy. https://doi.org/10.1103/physrevlett.98.122501

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