E1 and E2S factors of C12(α,γ0)O16 from γ-ray angular distributions with a 4 π-detector array

Details E1 and E2S factors of C12(α,γ0)O16 from γ-ray angular distributions with a 4 π-detector array E1 and E2S factors of C12(α,γ0)O16 from γ-ray angular distributions with a 4 π-detector array

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phrvc..73e5801a&link_type=abstract

Physical Review C, vol. 73, Issue 5, id. 055801

Astronomy and Astrophysics

Astrophysics

33

3H-, 3He-, And 4He-Induced Reactions, Resonance Reactions, Hydrostatic Stellar Nucleosynthesis, 6<=A<=19

Scientific paper

A new experiment to determine the thermonuclear cross section of the C12(α,γ)O16 reaction has been performed in regular kinematics using an intense α-particle beam of up to 340 μA from the Stuttgart DYNAMITRON. For the first time, a 4π-germanium-detector setup has been used to measure the angular distribution of the γ rays at all angles simultaneously. It consisted of an array of nine EUROGAM high-purity Ge detectors in close geometry, actively shielded individually with bismuth germanate crystals. The C12 targets were isotopically enriched by magnetic separation during implantation. The depth profiles of the implanted carbon in the C12 targets were determined by Rutherford backscattering for purposes of cross-section normalization and absolute determination of the E1 and E2S factors. Angular distributions of the γ decay to the O16 ground state were measured in the energy range Ec.m.=1.30 2.78 MeV and in the angular range (lab.) 30° 130°. From these distributions, astrophysical E1 and E2S-factor functions vs energy were calculated, both of which are indispensable to the modeling of this reaction and the extrapolation toward lower energies. The separation of the E1 and E2 capture channels was done both by taking the phase value ϕ12 as a free parameter and by fixing it using the results of elastic α-particle scattering on C12 in the same energy range.

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