Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 19: Nukleare Astrophysik I

HK 19.6: Vortrag

Dienstag, 16. März 2010, 15:45–16:00, HG VI

Measurement of the ¹⁵O(2p,γ)¹⁷Ne cross section by Coulomb Dissociation of ¹⁷Ne — •Justyna Marganiec¹, Thomas Aumann², Michael Heil², Ralf Plag², and Felix Wamers² — ¹ExtreMe Matter Institute EMMI, GSI Darmstadt, Darmstadt, Germany — ²Kernreaktionen und Nuklear Astrophysik, GSI Darmstadt, Darmstadt, Germany

For the production of proton-rich nuclei during the rp process two-proton capture plays an important role. This process can bridge long-lived waiting points which otherwise hamper the mass flow between CNO material and the FeNi mass region. One of these waiting points is ¹⁵O. The three-body radiative capture can proceed sequentially or directly from the three-body continuum. The rate of the ¹⁵O(2p,γ)¹⁷Ne reaction obtained using the two-successive-proton-capture model has been discussed in J. Görres et al. (Phys. Rev. C 51, 392, 1995). The role of continuum states (¹⁵O+2p) for the rate calculation has been demonstrated in L.V Grigorenko, M.V. Zhukov (Phys. Rev. C 72, 015803, 2005). It has been suggested that the reaction rate can be enhanced by a few orders of magnitude by taking into account the three-body continuum. In order to verify these calculations, we have deduced the ¹⁵O(2p,γ)¹⁷Ne cross section by studying the time-reversed process, the Coulomb dissociation of ¹⁷Ne, at the LAND/R³B setup at GSI, using a ¹⁷Ne secondary beam from the fragment separator FRS.

This project is supported by BMBF, EU (EURONS), and EMMI.