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Sensitivity to neutron captures and β-decays of the enhanced s-process in rotating massive stars at low metallicities
(2018-01-31)
The s-process in massive stars, producing nuclei up to A ≈ 90, has a different behaviour at low metallicity if stellar rotation is significant. This enhanced s-process is distinct from the s-process in massive stars around ...
Cross section of α-induced reactions on iridium isotopes obtained from thick target yield measurement for the astrophysical γ process
(2018-01-10)
The stellar reaction rates of radiative α-capture reactions on heavy isotopes are of crucial importance for the γ process network calculations. These rates are usually derived from statistical model calculations, which ...
The Nuclear Astrophysics program at n-TOF (CERN)
(EDP Sciences, 2017-12-30)
An important experimental program on Nuclear Astrophysics is being carried out at the n-TOF since several years, in order to address the still open issues in stellar and primordial nucleosynthesis. Several neutron capture ...
High-accuracy determination of the neutron flux in the new experimental area n_TOF-EAR2 at CERN
(2017-10-27)
A new high flux experimental area has recently become operational at the n_TOF facility at CERN. This new measuring station, n_TOF-EAR2, is placed at the end of a vertical beam line at a distance of approximately 20m from ...
The s-process nucleosynthesis : Impact of the uncertainties in the nuclear physics determined by monte carlo variations
(2017-10-01)
We investigated the impact of uncertainties in neutron-capture and weak reactions (on heavy elements) on the s-process nucleosynthesis in low-mass stars and massive stars using a Monte-Carlo based approach. We performed ...
The measurement programme at the neutron time-of-flight facility n-TOF at CERN
(EDP Sciences, 2017-09-13)
Neutron-induced reaction cross sections are important for a wide variety of research fields ranging from the study of nuclear level densities, nucleosynthesis to applications of nuclear technology like design, and criticality ...
Monte carlo simulations of the n-TOF lead spallation target with the Geant4 toolkit : A benchmark study
(EDP Sciences, 2017-09-13)
Monte Carlo (MC) simulations are an essential tool to determine fundamental features of a neutron beam, such as the neutron flux or the γ-ray background, that sometimes can not be measured or at least not in every position ...
High accuracy 234U(n,f) cross section in the resonance energy region
(EDP Sciences, 2017-09-13)
New results are presented of the 234U neutron-induced fission cross section, obtained with high accuracy in the resonance region by means of two methods using the 235U(n,f) as reference. The recent evaluation of the 235U(n,f) ...
The n-TOF facility : Neutron beams for challenging future measurements at CERN
(EDP Sciences, 2017-09-13)
The CERN n-TOF neutron beam facility is characterized by a very high instantaneous neutron flux, excellent TOF resolution at the 185 m long flight path (EAR-1), low intrinsic background and coverage of a wide range of ...
Characterization of the n-TOF EAR-2 neutron beam
(EDP Sciences, 2017-09-13)
The experimental area 2 (EAR-2) at CERNs neutron time-of-flight facility (n-TOF), which is operational since 2014, is designed and built as a short-distance complement to the experimental area 1 (EAR-1). The Parallel Plate ...