The 235U neutron-induced cross section is widely used as reference cross section for measuring other fission cross sections, but in the resonance region it is not considered as an IAEA standard ...because of the scarce experimental data covering the full region. In this work, we deal with a new analysis of the experimental data obtained with a detection setup based on parallel plate ionization chambers (PPACs) at the CERN n_TOF facility in the range from 1 eV to 10 keV. The relative cross section has been normalised to the IAEA value in the region between 7.8 and 11 eV, which is claimed as well-known. Comparison with the ENDF/B-VII evaluation and the IAEA reference file from 100 eV to 10 keV are provided.
The accurate determination of neutron cross-sections as a function of the neutron energy at a time-of-flight facility requires a precise knowledge of the time–energy relation for the neutron beam. ...For the n_TOF neutron beam at CERN, produced by spallation of high-energy protons on a Pb target, the time–energy relation is connected to the production mechanism and to the subsequent moderation process. A calibration of the neutron energy scale is proposed based on detailed Monte Carlo simulations of the facility. This time–energy relation has been experimentally validated by means of dedicated measurements of standard energy resonances, from 1eV to approximately 1MeV. On the basis of the present measurements, it is proposed to correct the energy of the 1.3eV resonance of 193Ir, which is commonly considered as an energy standard.
In 2002, an innovative neutron time-of-flight facility started operation at CERN: n_TOF. The main characteristics that make the new facility unique are the high instantaneous neutron flux, high ...resolution and wide energy range. Combined with state-of-the-art detectors and data acquisition system, these features have allowed to collect high accuracy neutron cross-section data on a variety of isotopes, many of which radioactive, of interest for Nuclear Astrophysics and for applications to advanced reactor technologies. A review of the most important results on capture and fission reactions obtained so far at n_TOF is presented, together with plans for new measurements related to nuclear industry.
The successful development of advanced nuclear systems for sustainable energy production and
nuclear waste management depends on high quality nuclear data libraries. Recent sensitivity stud-
ies and ...reports 1-3 have identi ed the need for substantially improving the accuracy of neutron
cross-section data for minor actinides. The n TOF collaboration has initiated an ambitious exper-
imental program for the measurement of neutron capture cross sections of minor actinides. Two
experimental setups have been constructed for this purpose: a Total Absorption Calorimeter (TAC)
4 for measuring neutron capture cross-sections of low-mass and/or radioactive samples and a set
of two low neutron sensitivity C6D6 detectors for the less radioactive materials.
Astrophysics at n_TOF Facility at CERN Tagliente, G; Abbondanno, U; Alvarez, H ...
Journal of physics. Conference series,
01/2011, Letnik:
312, Številka:
4
Journal Article
Recenzirano
Odprti dostop
The neutron time of flight (n_TOF) facility at CERN is a spallation neutron source with white neutron energy spectrum (from thermal to several GeV), covering the full energy range of interest for ...nuclear astrophysics, in particular for measurements of the neutron capture cross section required in s-process nucleosynthesis. This contribution presents an overview on the astrophysical program carried on at the n_TOF facility, the main results and their implications.
A neural network approach for the TPC signal processing Cennini, P.; Cittolin, S.; Revol, J.P. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
03/1995, Letnik:
356, Številka:
2
Journal Article
Recenzirano
Odprti dostop
Artificial neural networks may in some cases be alternatives to programmed computing. Since they offer a new important approach to information processing, we have investigated if the accuracy offered ...by this technique is good enough to extract physical information from the signals coming from a liquid argon time projection chamber. The results obtained implementing a neural network algorithm on a sequential scalar computer have been compared to those of a standard best-fit procedure on the same machine. This new method appears to be suited for the analysis of the events occurring in a very large detector, as that foreseen for the ICARUS experiment.
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