The interaction of alpha particles with nuclei as well as the related optical model potential (OMP) were of special interest from the earliest days of nuclear physics,. The widely-used phenomenological OMP parameters have been derived from the analysis of either elastic-scattering or alpha-induced reaction cross sections below the Coulomb barrier, and then used to describe also the...
Fluorine is one of the most important materials in the molten salt reactor (MSR), one of the Generation IV reactor types. These designs use molten fluorides or chlorides as fuel mixtures or coolants. This type of reactor is under research and development in several countries worldwide, motivated by the fact that the MSRs have certain unique characteristics which offer a safer, more efficient...
Micromegas detectors are versatile gaseous charged-particle detectors.
They can be used for neutron detection with a suitable neutron/charged
particle converter, usually Li-6, B-10 or U-235. The detector consists
of a two-stage parallel-plate avalanche chamber with an ionization drift
region and an amplification region. The use of the microbulk technique
allows the use of printed circuit board...
In order to perform measurements of high-energy neutron fields, it is necessary to calibrate instruments in reference fields at energies from 20 MeV up to an energy approaching 1 GeV.
The calibration of instrumentation for high-energy neutrons can be achieved in iThemba Laboratory for Accelerator-Based Sciences (TLABS) where a relatively high yield of quasi-monoenergetic neutrons up to 200...
The National Physical Laboratory (NPL) is the UK’s national standards laboratory. The Nuclear Metrology Group (NMG) operates world-leading facilities for measuring neutron source emission rates and providing extensive accelerator and source based calibration fields. Monoenergetic neutrons are produced via the interaction of ion beams from a 3.5 MV Van de Graaff accelerator with different...
Intensive, high energy neutron beams with energies up to 33 MeV are produced using cyclotron driven broad-spectrum and quasi-monoenergetic neutron generators at the NPI. The neutron beams are well characterized with the TOF and PRT measurements.
The detection system of the charged particles from the (n,cp) reactions and the system for the detection of direct and delayed gammas produced in the...
There is a clear and long-standing demand from the International Atomic Energy Agency (IAEA) to improve the situation of nuclear data, in particular reference cross sections, in the energy range above 20 MeV. Spallation neutron sources, such as n_TOF at CERN, are the workhorses for such measurements because they provide a continuous energy coverage. However, they pose specific technical...
It is generally accepted that prompt fission neutrons (PFN) have
two components with unknown relative intensities: neutrons dynami-
cally released at scission (SN) and neutrons evaporated from fully ac-
celerated fragments (EVN). There is no indication which of these two
components is the dominant one since the gross features of PFN can be
reproduced by both models [1, 2, 3]. To remove the...
Wide fast neutron research cooperative network is being developed between the Czech Republic, Ukraine, Republic of Armenia, and Indian universities in last five years. All has begun in JINR Dubna, however, at the moment local facilities are used for the research. The point of cooperation were Accelerator Driven Subcritical Systems, and the medium to high energy nuclear data (cross-section,...
At the IPPE over the past 20 years, digital methods are widely used to register neutrons and products of nuclear reactions caused by neutrons. This method is based on the fact that the signals taken from radiation detectors are converted to digital form. Further processing of these signals is performed using DSP methods. Using the example of ionization chambers with Frisch grid, organic...
The Bay Area Neutron Group (BANG) has developed and characterized a high-intensity neutron source facility at the 88-Inch Cyclotron of the Lawrence Berkeley National Laboratory. A variety of white neutron sources have been produced via deuteron breakup on thick beryllium and tantalum targets with incident deuteron energies from 16-33 MeV. Neutron energy spectra are measured with activation...
In the recent years, scientific interest in the feasibility study of accelerator driven sub-critical systems (ADS) for transmutation of the long-lived components of radioactive wastes (RAW) is very high. ADS systems are a part of research on future reactor IVth generation. The high-energy neutrons are an ideal tool to induce fission in most transuranic isotopes. The cross-sections for nuclear...
