Measurement of the ²⁰N(γ,n)¹⁹N Reaction Rate for R-Process Nucleosynthesis


Measurement of the ²⁰N(γ,n)¹⁹N Reaction Rate for R-Process Nucleosynthesis

Röder, M.; for the R3B Collaboration

In the astrophysical r-process (rapid neutron capture process), that is important for the nucleosynthesis of heavy elements, many neutron-rich nuclei are involved.
The reactions on these exotic nuclei can only be studied with radioactive ion beams since target material cannot be fabricated from them.
One example of these reactions is the ¹⁹N(n,γ)²⁰N reaction that is important in a neutrino-driven wind scenario.
Using ²⁰N as a beam, this reaction was studied at GSI in inverse kinematics via Coulomb-dissociation exploiting the virtual gamma field of a heavy target in the so called s393-experiment.
The experiment was performed at the LAND/R3B setup (Large Area Neutron Detector, Reactions with Relativistic Radioactive Beams) in a kinematically complete measurement, i.e., detecting all particles leaving the nuclear reaction.
The neutrons flying at relativistic velocity were observed by the LAND-detector, the calibration of which plays a crucial role for the above specific reaction.
I will give an overview of the R3B-setup, the calibration of the LAND-detector and a status of the analysis of the ²⁰N(γ,n)¹⁹N reaction.

Keywords: r-process; neutron-rich nuclei; Coulomb-dissociation; radioactive ion beams

  • Lecture (Conference)
    77. Jahrestagung der DPG und DPG-Frühjahrstagung, 04.-08.03.2013, Dresden, Deutschland

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Publ.-Id: 19043