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The role of fission on neutron star mergers and its impact on the r-process peaks
(American Institute of Physics (AIP), 2016-06-21)
The comparison between observational abundance features and those obtained from nucleosynthesis predictions of stellar evolution and/or explosion simulations can scrutinize two aspects: (a) the conditions in the astrophysical ...
Theory considerations for nucleosynthesis beyond Fe with special emphasis on p-nuclei in massive stars
(American Institute of Physics (AIP), 2016-06-21)
Nucleosynthesis of heavy elements requires the use of different experimental and theoretical methods to determine astrophysical reaction rates than light element nucleosynthesis. Additionally, there are also larger ...
Integral measurement of the 12C(n, p)12B reaction up to 10 GeV
(2016-04-22)
The integral measurement of the 12C(n, p)12B reaction was performed at the neutron time-of-flight facility n_TOF at CERN. The total number of 12B nuclei produced per neutron pulse of the n_TOF beam was determined using the ...
Towards the high-accuracy determination of the 238U fission cross section at the threshold region at CERN - N-TOF
(EDP Sciences, 2016-03-15)
The 238U fission cross section is an international standard beyond 2 MeV where the fission plateau starts. However, due to its importance in fission reactors, this cross-section should be very accurately known also in the ...
Fission Fragment Angular Distribution measurements of 235U and 238U at CERN n-TOF facility
(EDP Sciences, 2016-03-15)
Neutron-induced fission cross sections of 238U and 235U are used as standards in the fast neutron region up to 200 MeV. A high accuracy of the standards is relevant to experimentally determine other neutron reaction cross ...
Hybrid method to resolve the neutrino mass hierarchy by supernova (anti)neutrino induced reactions
(2016-02-03)
We introduce a hybrid method to determine the neutrino mass hierarchy by simultaneous measurements of responses of at least two detectors to antineutrino and neutrino fluxes from accretion and cooling phases of core-collapse ...
The Impact of Fission on R-Process Calculations
(2016-01-05)
We have performed r-process calculations in neutron star mergers (NSM) and jets of magnetohydrodynamically driven (MHD) supernovae. In these very neutron-rich environments the fission model of heavy nuclei has an impact ...
Investigation of Alpha-Induced Reactions on 107Ag at Astrophysical Energies
(2016-01-05)
Cross sections of the 107Ag(α, γ)111In and 107Ag(α,n)110In reactions have been measured with the activation method at effective center-of-mass energies between 7.79 MeV and 12.00 MeV close to the astrophysical energy range. ...
Revision of the derivation of stellar rates from experiment and impact on Eu s-process contributions
(2016-01-05)
A new, general formalism to include experimental data in revised stellar rates is discussed, containing revised uncertainties. Application to the s-process shows that the actual uncertainties in the neutron capture rates ...
Current hot questions on the s process in AGB stars
(2016-01-05)
Asymptotic giant branch (AGB) stars are a main site of production of nuclei heavier than iron via the s process. In massive (>4 M⊙) AGB stars the operation of the 22Ne neutron source appears to be confirmed by observations ...