Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 6: Kern- und Teilchen-Astrophysik

HK 6.3: Vortrag

Freitag, 4. März 2005, 14:45–15:00, TU MA144

The total S factor of ¹⁴N(p,γ)¹⁵O — •J.N. Klug, C.E. Rolfs, F. Schümann, F. Strieder, and H.P. Trautvetter — Ruhr-Univ. Bochum

The ¹⁴N(p,γ)¹⁵O reaction is the slowest reaction in the hydrogen burning CNO cycle and thus of high astrophysical interest.The reaction rate determines the CNO neutrino spectrum of our sun and influences sensitively the age determination of globular clusters. A recent work [1] done at the LUNA facility at the Laboratori Nazionali del Gran Sasso at energies below 400 keV shows that R-matrix fits to the existing data reveal good agreement for the energy regime below 500 keV. Nevertheless, a precise determination of the astrophysical S factor at zero energy depends strongly on the data above 500 keV. Therefore a new measurement of ¹⁴N(p,γ)¹⁵O in the energy range of 500 to 2000 keV was performed at the Dynamitron Tandem Laboratory (DTL) of the Ruhr-Universität Bochum in order to remove systematic uncertainties in the existing data, e.g. summing corrections. supported by BMBF (05CL1PC1/1)

[1] A. Formicola et al., Phys. Lett. B 591, 61-68 (2004).