Status and outlook of the neutron time-of-flight facility n_TOF at CERN Gunsing, F.; Abbondanno, U.; Aerts, G. ...
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms,
08/2007, Letnik:
261, Številka:
1-2
Journal Article, Publication
Recenzirano
Odprti dostop
The neutron time-of-flight facility n_TOF at CERN, fully operational since 2002, combines a high instantaneous neutron flux with high energy resolution. The wide energy range and the high neutron ...flux per time-of-flight burst result in a much enhanced signal to background ratio for neutron capture of radioactive isotopes and makes this facility well suited for the measurement of high quality neutron-induced reaction cross-sections.
Neutrons are created by spallation reactions induced by a pulsed 20GeV/c proton beam impinging on a lead target. A 5cm water slab surrounding the lead target serves as a coolant and at the same time as a moderator of the spallation neutron spectrum, providing a wide energy spectrum from 0.1eV to about 250MeV.
By the end of 2005, a first phase of data taking has been successfully terminated. Fission and capture experiments have been performed on a variety of isotopes of interest for nuclear astrophysics, advanced nuclear technologies and for basic nuclear physics.
The instrumentation developed for this facility consists of parallel plate avalanche counter and fission ionization chamber detectors for the fission experiments and of low mass C6D6 detectors and a 4pi BaF2 total absorption calorimeter for capture experiments. A new data acquisition system, based on sampling of the detector signals, has been developed to cope with the high count rates and to minimize the effective dead time to only a few tens of nanosecond.
A second phase of data taking is planned to start in 2007, after an upgrade of the spallation target. On the longer term, the construction of a flight path at 20m resulting in an increased neutron flux of about a factor of 100 opens new possibilities.
The n_TOF neutron time-of-flight facility at CERN is used for high quality nuclear data measurements from thermal energy up to hundreds of MeV. In line with the CERN open data policy, the n_TOF ...Collaboration takes actions to preserve its unique data, facilitate access to them in standardised format, and allow their re-use by a wide community in the fields of nuclear physics, nuclear astrophysics and various nuclear technologies. The present contribution briefly describes the n_TOF outcomes, as well as the status of dissemination and preservation of n_TOF final data in the international EXFOR library.
A new set of measurements for the total and capture cross section determination of W isotopes was done using GELINA (GEel LINear Accelerator), a neutron Time-Of-Flight facility at the Institute for ...Reference Materials and Measurements (IRMM). Measuring stations at different flight path lengths were used in order to cover a broad neutron energy range with high resolution demands. Experimental techniques adopted for both transmission and capture measurements are well established using a (6)Li glass detector and C(6)D(6) scintillation arrays as detections systems respectively., As target samples highly enriched (182,183,184,186)W metallic discs were used.
A set of neutron transmission and capture experiments based on the Time Of Flight (TOF) technique, were performed in order to determine the 241Am capture cross section in the energy range from 0.01 ...eV to 1 keV. The GELINA facility of the Institute for Reference Materials and Measurements (IRMM) served as the neutron source. A pair of C6D6 liquid scintillators was used to register the prompt gamma rays emerging from the americium sample, while a Li-glass detector was used in the transmission setup. Results from the capture and transmission data acquired are consistent with each other, but appear to be inconsistent with the evaluated data files. Resonance parameters have been derived for the data up to the energy of 100 eV.
A set of neutron transmission and capture experiments based on the Time Of Flight (TOF) technique, were performed in order to determine the super(241)Am capture cross section in the energy range from ...0.01 eV to 1 keV. The GELINA facility of the Institute for Reference Materials and Measurements (IRMM) served as the neutron source. A pair of C sub(6)D sub(6) liquid scintillators was used to register the prompt gamma rays emerging from the americium sample, while a Li-glass detector was used in the transmission setup. Results from the capture and transmission data acquired are consistent with each other, but appear to be inconsistent with the evaluated data files. Resonance parameters have been derived for the data up to the energy of 100 eV.
Muon Tomography Application with Micromegas Detectors Sampsonidis, D.; Amperiadou, D.; Petridou, C. ...
2023 12th International Conference on Modern Circuits and Systems Technologies (MOCAST),
2023-June-28
Conference Proceeding
The muon tomography method is being studied in this publication for a small scale laboratory experiment, which aims to the imaging of a lead cube with a cosmic rays telescope using Micromegas ...detectors. Two methods were used: muon transmission radiography and muon scattering tomography. The former takes advantage of the absorption of cosmic muons by the object we want to visualize, while the latter is based on the multiple Coulomb scattering of the muons as they pass through the lead cube. In both cases, the approximate position of the cube as well as its dimensions can be determined.
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