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Solution of the alpha-potential mystery in the gamma-process and its impact on the Nd/Sm ratio in meteorites
(2013-08-09)
The 146Sm/144Sm ratio in the early solar system has been constrained by Nd/Sm isotope ratios in meteoritic material. Predictions of 146Sm and 144Sm production in the gamma-process in massive stars are at odds with these ...
Silicon carbide grains of type C provide evidence for the production of the unstable isotope Si in supernovae
(2013-07-01)
Carbon-rich grains are observed to condense in the ejecta of recent core-collapse supernovae (SNe) within a year after the explosion. Silicon carbide grains of type X are C-rich grains with isotopic signatures of explosive ...
Constraining the astrophysical origin of the p-nuclei through nuclear physics and meteoritic data
(2013-06-01)
A small number of naturally occurring, proton-rich nuclides (the p-nuclei) cannot be made in the s- and r-processes. Their origin is not well understood. Massive stars can produce p-nuclei through photodisintegration of ...
Systematic study of (p,γ) reactions on Ni isotopes
(2013-05-09)
A systematic study of the radiative proton capture reaction for all stable nickel isotopes is presented. The results were obtained using 2.0-6.0 MeV protons from the 11-MV tandem Van de Graaff accelerator at the University ...
Europium s-process signature at close-to-solar metallicity in stardust SiC grains from asymptotic giant branch stars
(2013-05-01)
Individual mainstream stardust silicon carbide (SiC) grains and a SiC-enriched bulk sample from the Murchison carbonaceous meteorite have been analyzed by the Sensitive High Resolution Ion Microprobe-Reverse Geometry for ...
General properties of astrophysical reaction rates in explosive nucleosynthesis
(2013-03-01)
Fundamental differences in the prediction of reaction rates with intermediate and heavy target nuclei compared to the ones with light nuclei are discussed, with special emphasis on stellar modifications of the rates. Ground ...
Performance of the neutron time-of-flight facility n_TOF at CERN
(2013-02)
The neutron time-of-flight facility n_TOF features a white neutron source produced by spallation through 20 GeV/c protons impinging on a lead target. The facility, aiming primarily at the measurement of neutron-induced ...
Neutron Capture Cross Section of Unstable Ni-63 : Implications for Stellar Nucleosynthesis
(2013-01-08)
The Ni-63(n, gamma) cross section has been measured for the first time at the neutron time-of-flight facility n_TOF at CERN from thermal neutron energies up to 200 keV. In total, capture kernels of 12 (new) resonances were ...
Measurement of the neutron-induced fission cross-section of Am-241 at the time-of-flight facility n_TOF
(2013)
The neutron-induced fission cross-section of Am-241 has been measured relative to the standard fission cross-section of U-235 between 0.5 and 20 MeV. The experiment was performed at the CERN n_TOF facility. Fission fragments ...
Neutron research at the N-TOF facility (CERN) : Results and perspectives
(American Institute of Physics (AIP), 2013)
In the first ten years of operation, the neutron time-of-flight facility n-TOF at CERN has produced a large body of new and accurate data on neutron capture and fission cross sections, relevant to Nuclear Astrophysics and ...