14N(p,gamma)15O ground state capture studied above the 259 keV resonance at LUNA


14N(p,gamma)15O ground state capture studied above the 259 keV resonance at LUNA

Marta, M.; Bemmerer, D.; Kunz, R.; Rolfs, C.; Strieder, F.; Trautvetter, H.-P.

The cross section of the 14N(p,gamma)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 O-15 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 O-15 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 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)

Keywords: nuclear astrophysics; solar neutrinos; age of the universe; globular clusters

  • Lecture (Conference)
    Frühjahrstagung Hadronen und Kerne, 13.03.2007, Gießen, Deutschland

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Publ.-Id: 10250