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Browsing by Author "Vogt, K."
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Determination of (gamma,n) reaction rates for the astrophysical gamma process
Vogt, K.; Mohr, P.; Rauscher, T.; Sonnabend, K.; Zilges, A. (2003-05-05)(gamma,n) cross sections and reaction rates in the astrophysical gamma-process have been measured for the nucleus Pb-204 using the method of photoactivation. Some peculiarities of the (gamma,n) cross.section of this nucleus ... -
Determination of (n,gamma) reaction rates at s-process branching points via their inverse reactions
Sonnabend, K.; Mengoni, A.; Mohr, P.; Rauscher, T.; Vogt, K.; Zilges, A. (2003-05-19)We present our method to determine the (n,gamma) reaction rates of s-process branching point nuclei using data of the inverse (gamma,n) reaction. As an example, we selected Zr-95. The analysis of the data of the reaction ... -
Determination of the (n,gamma) reaction rate of unstable W-185 in the astrophysical s-process via its inverse reaction
Sonnabend, K.; Mengoni, A.; Mohr, P.; Rauscher, T.; Vogt, K.; Zilges, A. (2003-05-05)The (gamma,n) reaction rate of W-186 was measured in order to deduce the (n,gamma) reaction rate of 185 W, an important branching point in the astrophysical s-process. The theoretical predictions have been confirmed and ... -
Experimental simulation of a stellar photon bath by bremsstrahlung: the astrophysical gamma-process
Mohr, P.; Vogt, K.; Babilon, M.; Enders, J.; Hartmann, T.; Hutter, C.; Rauscher, T.; Volz, S.; Zilges, A. (2000-08-31)The nucleosynthesis of heavy proton-rich nuclei in a stellar photon bath at temperatures of the astrophysical gamma-process was investigated where the photon bath was simulated by the superposition of bremsstrahlung spectra ... -
Measurement of the (gamma, n) cross section of the nucleus Au-197 close above the reaction threshold
Vogt, K.; Mohr, P.; Babilon, M.; Bayer, W.; Galaviz, D.; Hartmann, T.; Hutter, C.; Rauscher, T.; Sonnabend, K.; Volz, S.; Zilges, A. (2002-08-26)The cross section and the astrophysical reaction rate of the reaction Au-197(gamma,n)Au-196 have been measured close above the reaction threshold at E-thr = 8.071 MeV using the method of photoactivation. The results are ... -
Measurement of the (gamma,n) reaction rates of the nuclides Pt-190, Pt-192, and Pt-198 in the astrophysical gamma process
Vogt, K.; Mohr, P.; Babilon, M.; Enders, J.; Hartmann, T.; Hutter, C.; Rauscher, T.; Volz, S.; Zilges, A. (2001-05)The nucleosynthesis of heavy neutron-deficient nuclei in a stellar photon bath at the temperatures relevant for the astrophysical gamma process was investigated. In order to derive (gamma ,n) cross sections and reaction ... -
The (n,gamma) cross sections of short-living s-process branching points
Sonnabend, K.; Mengoni, A.; Mohr, P.; Rauscher, T.; Vogt, K.; Zilges, A. (American Institute of Physics (AIP), 2004)An experimental method to determine the (n,gamma) cross section of short-living s-process branching points using data of the inverse (gamma,n) reaction is presented. The method was used to observe the branching point nucleus ... -
Photoreactions in nuclear astrophysics
Mohr, P.; Rauscher, T.; Sonnabend, K.; Vogt, K.; Zilges, A. (2003-05-05)Cross sections and reaction rates of (gamma,n) reactions have been measured close above threshold with the photoactivation technique. The experimental data for W-186,Pt-190,Pt-192,Pt-198, Hg-196,Hg-198,Hg-204, Au-197, and ... -
The s-process branching at W-185
Sonnabend, K.; Mohr, P.; Vogt, K.; Zilges, A.; Mengoni, A.; Rauscher, T.; Beer, H.; Kappeler, F.; Gallino, R. (2003-01-20)The neutron capture cross section of the unstable nucleus W-185 has been derived from experimental photoactivation data of the inverse reaction W-186(gamma, n) W-185. The new result of sigma = 687 +/- 110 mbarn confirms ...