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Astrophysical conditions for an r-process in the high-entropy wind scenario of type II supernovae
(2005-07-25)
Within a full dynamical parameter study including freezeout effects, we have determined the astrophysical conditions for an r-process in the so-called "neutrino-wind" scenario of core-collapse type II supernovae (SNII). ...
Measurements of the 90,91,92,94,96Zr(n, gamma) cross-sections at n_TOF
(2005-07-25)
Neutron capture cross sections of the 90,91,91,94,96Zr have been measured over the energy range from 1 eV to 1 MeV at the spallation neutron facility n-TOF at CERN in 2003. The innovative features of the neutron beam, in ...
Parity-dependence in the nuclear level density
(2005-07-25)
Astrophysical reaction rates are sensitive to the parity distribution at low excitation energies. We combine a formula for the energy-dependent parity distribution with a microscopic-macroscopic nuclear level density. This ...
Neutron capture cross section measurements for nuclear astrophysics at CERN n_TOF
(2005-07-25)
A series of neutron capture cross section measurements of interest to nuclear astrophysics have been recently performed at n-TOF, the neutron spallation source operating at CERN. The low repetition frequency of the proton ...
Neutron captures in the r-process : Do we know them and does it make any difference?
(2005-07-25)
Nucleosynthesis of elements beyond the iron peak requires reactions with neutrons due to the high Coulomb barriers which prevent charged particle reactions. Approximately half of the intermediate and heavy elements are ...
The (n,gamma) cross sections of the p-process nuclei Se-74 and Sr-84 at kT=25 keV
(2005-07-25)
The formation of the isotopes on the proton-rich side of the valley of stability cannot be ascribed to neutron capture reactions in the r- or s-processes. These nuclei are produced in the p process, which presumably takes ...
Elastic alpha scattering on Sn-112 and Sn-124 at astrophysically relevant energies
(2005-06)
The cross sections for the elastic scattering reactions Sn-112,Sn-124(alpha,alpha)Sn-112,Sn-124 at energies above and below the Coulomb barrier are presented and compared to predictions for global alpha-nucleus potentials. ...
Nuclear physics : A key ingredient in astrophysical modeling
(2005-04-18)
Nuclear physics is a basic ingredient in a large number of energetic astrophysical environments which are characterized by sufficient temperatures and densities to permit scattering events among particles, leading to nuclear ...
The data acquisition system of the neutron time-of-flight facility n_TOF at CERN
(2005-02-11)
The n_TOF facility at CERN has been designed for the measurement of neutron capture, fission and (n, xn) cross-sections with high accuracy. This requires a flexible and-due to the high instantaneous neutron flux-almost ...