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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Kern- und Teilchen-Astrophysik

HK 15.4: Talk

Tuesday, March 13, 2007, 15:00–15:15, E

Study of the ¹²C+¹²C fusion reactions near the Gamow energy — •Frank Strieder¹, Timothy Spillane², Francesco Raiola¹, Hans-Werner Becker¹, Cristina Bordeanu³, Lucio Gialanella⁴, Claus Rolfs¹, Daniel Schürmann¹, and Jeff Schweitzer² — ¹Institut für Physik mit Ionenstrahlen, Ruhr-Universität Bochum, Germany — ²University of Connecticut, Storrs, CT, USA — ³HH-NIPNE, Bukarest, Romania — ⁴INFN, Napoli, Italy

The fusion reactions ¹²C(¹²C,α)²⁰Ne and ¹²C(¹²C,p)²³Na have been studied from E = 2.10 to 4.75 MeV by γ-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 α channel by a factor of 5 near T = 8×10⁸ K. Due to the resonance structure, extrapolation to the Gamow energy E_G = 1.5 MeV is quite uncertain. An experimental approach based on particle spectroscopy is under preparation at the Dynamitron-Tandem Laboratory of the Ruhr-Universität Bochum. Prospects for a measurement of these reactions at an underground accelerator placed in a salt mine in combination with a high efficiency detection setup, which could provide data over the full E_G energy range, will be discussed.