Nuclear Astrophysics with Real Photons from Bremstrahlung

Details Nuclear Astrophysics with Real Photons from Bremstrahlung Nuclear Astrophysics with Real Photons from Bremstrahlung

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..dnp.dc010g&link_type=abstract

American Physical Society, Division of Nuclear Physics Meeting, 27-30 October, 2004, Chicago, IL. MEETING ID: DNP04., abstract #

Physics

Nuclear Physics

Scientific paper

The nucleosynthesis of most of the heavy elements beyond the iron peak is explained by neutron capture reactions in the astrophysical s- and r-process. However, there is a small portion of stable nuclei on the proton rich side of the valley of β-stability which cannot be produced through these processes. The so-called p-nuclei have typically very low isotopic abundances. They are mainly produced by series of photon-induced reactions -- like (γ,n), (γ,p) or (γ,α) -- in the astrophysical p-process during supernova explosions. (γ,n) reaction rates are measured at the Darmstadt S-DALINAC accelerator using the real photons of the bremsstrahlung facility. A superposition of several bremsstrahlung spectra is used to simulate a quasi-stellar photon bath at typical p-process temperatures T9 = 2 -- 3. Consequently, we can deduce directly the groundstate reaction rates and their temperature dependence in the astrophysically relevant energy region.

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