Münster 2002 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 25: Nuclear and Particle Astrophysics III

HK 25.5: Talk

Wednesday, March 13, 2002, 12:00–12:15, C

Determination of S_E1 and S_E2 for ¹²C(α,γ)¹⁶O from Gamma Angular Distribution Measurements — •Michael Fey¹, J.W. Hammer¹, D. Malcherek¹, R. Kunz¹, A. Lefèbvre², J. Kiener², V. Tatischeff², M. Assunção², A. Coc², C. Grama², F. Hammache², F. Hannachi², A. Korichi², A. Lopez-Martens², J.P. Thibaud², F. Haas³, C. Beck³, S. Courtin³, M. Rousseau³, N. Rowley³, S. Szilner³, S. Harissopulos⁴, E. Galanopoulos⁴, G. Kriembardis⁴, T. Paradellis⁴, G. Staudt⁵, J. Weil⁶, and F. Fleurot⁷ — ¹Institut für Strahlenphysik, Universität Stuttgart, Germany — ²CSNSM, Orsay, France — ³IRes, Strasbourg, France — ⁴N.C.S.R. “Demokritos”, Athens, Greece — ⁵Physikalisches Institut, Universität Tübingen, Germany — ⁶University of Kentucky, Lexington, USA — ⁷KVI, University of Groningen, Netherlands

Several Experiments on ¹²C(α,γ)¹⁶O have been performed at the 4 MV Dynamitron accelerator in Stuttgart with arrays of high efficient HPGe(BGO)-detectors to obtain γ angular distributions in a wide energy range. From these the E1 and E2 cross sections can be separated, which are required to describe the complex capture mechanism of this reaction with several interfering states and the non-resonant capture. From an R-matrix analysis one obtains an appropriate model description of this reaction and the extrapolation into the stellar energy range of stellar burning temperatures. The status of the experiments and several results will be presented and discussed.