Gießen 2007 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Kern- und Teilchen-Astrophysik

HK 15.2: Talk

Tuesday, March 13, 2007, 14:30–14:45, E

¹⁴N(p,γ)¹⁵O ground state capture studied above the 259 keV resonance at LUNA — •Michele Marta¹, Daniel Bemmerer¹, Ralf Kunz², Claus Rolfs², Frank Strieder², and Hanns-Peter Trautvetter² for the LUNA collaboration — ¹Institut für Strahlenphysik, Forschungszentrum Dresden-Rossendorf — ²Institut für Experimentalphysik III, Ruhr-Universität Bochum

The cross section of the ¹⁴N(p,γ)¹⁵O reaction directly influences the rate of the CNO cycle of hydrogen burning. In order to reliably extrapolate the cross section to the solar Gamow peak, in a previous LUNA experiment capture to the ground state and several excited states in ¹⁵O has been measured and used in an R-matrix fit [1,2]. The data on the ground state capture had been affected by the true coincidence summing effect in a large volume HPGe detector placed in close geometry [1], limiting the precision of the extrapolation.

A new measurement of the cross section for capture to the ground state in ¹⁵O is running at LUNA in Gran Sasso (Italy). A clover HPGe detector is used to reduce the summing correction and its consequent uncertainty. We concentrate on energies above the E_CM = 259 keV resonance, where the R-matrix fit can be constrained by precision data.

[1] A. Formicola et al., Phys. Lett B 591, 61 (2004)
[2] G. Imbriani et al., Eur. Phys. J. A 25, 455 (2005)