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Prediction of astrophysical reaction rates as a challenge to nuclear physics
(2003-05-05)
Explosive nuclear burning in astrophysical environments produces unstable nuclei which again can be targets for subsequent reactions. In addition, it involves a large number of stable nuclides which are not fully explored ...
Influence of parity-dependence in the nuclear level density on the prediction of astrophysical reaction rates
(2003-05-05)
A simple description for obtaining the parity distribution of nuclear levels in the pf + g(9/2) shell as a function of excitation energy was recently derived. We implement this in a global nuclear level density model. In ...
alpha-nucleus potentials and photon-induced nucleosynthesis
(2003-05-05)
New data for the Sn-112,Sn-12 4(alpha,alpha) (112,124) Sn reaction have been measured and are presently analyzed. Results of the Sn-112 circle times alpha potential at the energy Ec.m approximate to 14 MeV are presented. ...
The Pb-208(n, gamma) cross section
(2003-05-05)
The Maxwellian average neutron capture (MAC) cross section of Pb-208 has been reinvestigated. With the activation technique cross section measurements were performed at 25, 30, 52, 104, 149, and 215keV. At 30keV we succceeded ...
Se(p,gamma) cross section measurements for p-process studies
(2003-05-05)
As a continuation of a systematic study of reactions relevant to astrophysical p-process, the (p, gamma) or (p, n) cross sections of three Se isotopes have been measured using all activation technique in the proton energy ...
Photoreactions in nuclear astrophysics
(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 ...
Determination of the (n,gamma) reaction rate of unstable W-185 in the astrophysical s-process via its inverse reaction
(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 ...
Nuclear cross sections, nuclear structure and stellar nucleosynthesis
(2003-05-05)
The role of nuclear reactions (strong, weak and electromagnetic) and nuclear structure effects are discussed in a number of stellar applications. We address fusion cross sections in stellar evolution, neutrino-induced ...
Nuclear data needs for the study of nucleosynthesis in massive stars
(2003-05-05)
The critical nuclear physics needed to calculate the evolution of and nucleosynthesis in massive stars is reviewed with emphasis on the uncertainties. Some reaction rates - the most important and uncertain still being C-12 ...
Nucleosynthesis of heavy elements in massive stars
(2003-05-05)
We present nucleosynthesis results form calculations that follow the evolution of massive stars from their birth on the main sequence through their explosion as supernovae. Our simulations include all relevant isotopes and ...