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Sensitivity of astrophysical reaction rates to nuclear uncertainties
(2012-08)
Sensitivities of nuclear reaction rates to a variation of nuclear properties are studied. Target nuclei range from proton-to neutron dripline for 10
Determination of Pr-141(alpha, n)Pm-144 cross sections at energies of relevance for the astrophysical p process using the gamma gamma coincidence method
(2011-10-19)
The reaction Pr-141(alpha, n)Pm-144 was investigated between E-alpha = 11 MeV and 15 MeV with the activation method using the gamma gamma coincidence method with a segmented clover-type high-purity Germanium (HPGe) detector. ...
Suppression of the stellar enhancement factor and the reaction Rb-85(p, n)Sr-85
(2009-09)
It is shown that a Coulomb suppression of the stellar enhancement factor occurs in many endothermic reactions at and far from stability. Contrary to common assumptions, reaction measurements for astrophysics with minimal ...
Low-lying dipole response in the relativistic quasiparticle time blocking approximation and its influence on neutron capture cross sections
(2009-05-15)
We have computed dipole strength distributions for nickel and tin isotopes within the Relativistic Quasiparticle Time Blocking Approximation (RQTBA). These calculations provide a good description of data, including the ...
Astrophysical relevance of gamma transition energies
(2008-09)
The relevant gamma energy range is explicitly identified where additional gamma strength must be located to have an impact on astrophysically relevant reactions. It is shown that folding the energy dependences of the ...
Large-scale prediction of the parity distribution in the nuclear level density and application to astrophysical reaction rates
(2007-04)
A generalized method to calculate the excitation-energy dependent parity ratio in the nuclear level density is presented, using the assumption of Poisson distributed independent quasi particles combined with BCS occupation ...
Measurement of the neutron capture cross section of the s-only isotope Pb-204 from 1 eV to 440 keV
(2007-01)
The neutron capture cross section of Pb-204 has been measured at the CERN n_TOF installation with high resolution in the energy range from 1 eV to 440 keV. An R-matrix analysis of the resolved resonance region, between 1 ...
alpha-induced cross sections of Cd-106 for the astrophysical p process
(2006-08)
The Cd-106(alpha,gamma)Sn-110 reaction cross section has been measured in the energy range of the Gamow window for the astrophysical p-process scenario. The cross sections for Cd-106(alpha,n)Sn-109 and for Cd-106(alpha,p)In-109 ...
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 ...
The s-process branching at W-185
(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 ...