5 research outputs found
Development of a High Intensity Neutron Source at the European Spallation Source: The HighNESS project
The European Spallation Source (ESS), presently under construction in Lund,
Sweden, is a multidisciplinary international laboratory that will operate the
world's most powerful pulsed neutron source. Supported by a 3M Euro Research
and Innovation Action within the EU Horizon 2020 program, a design study
(HighNESS) is now underway to develop a second neutron source below the
spallation target. Compared to the first source, located above the spallation
target and designed for high cold and thermal brightness, the new source will
provide higher intensity, and a shift to longer wavelengths in the spectral
regions of cold (2 /- 20 {\AA}), very cold (VCN, 10 /- 120 {\AA}), and ultra
cold (UCN, > 500 {\AA}) neutrons. The core of the second source will consist of
a large liquid deuterium moderator to deliver a high flux of cold neutrons and
to serve secondary VCN and UCN sources, for which different options are under
study. The features of these new sources will boost several areas of condensed
matter research and will provide unique opportunities in fundamental physics.
Part of the HighNESS project is also dedicated to the development of future
instruments that will make use of the new source and will complement the
initial suite of instruments in construction at ESS. The HighNESS project
started in October 2020. In this paper, the ongoing developments and the
results obtained in the first year are described.Comment: 10 pages, 10 figures, 14th International Topical Meeting on Nuclear
Applications of Accelerators, November 30 to December 4, 2021, Washington, D
The Joint Evaluated Fission and Fusion Nuclear Data Library, JEFF-3.3
The Joint Evaluated Fission and Fusion nuclear data library 3.3 is described. New evaluations for neutron-induced interactions with the major actinides 235U, 238U and 239Pu, on 241Am and 23Na, 59Ni, Cr, Cu, Zr, Cd, Hf, W, Au, Pb and Bi are presented. It includes new fission yields, prompt fission neutron spectra and average number of neutrons perfission. In addition, new data for radioactive decay, thermal neutron scattering, gamma-ray emission, neutron activation, delayed neutrons and displacement damage are presented. JEFF-3.3 was complemented by files from the TENDL project. The libraries for photon, proton, deuteron, triton, helion and alpha-particle induced reactions are from TENDL-2017. The demands for uncertainty quantification in modeling led to many new covariance data. A comparison between results from model calculations using the JEFF-3.3 library and those from benchmark experiments for criticality, delayed neutron yields, shielding and decay heat, reveals that JEFF-3.3 is excellent for a wide range of nuclear technology applications, in particular nuclear energy.JRC.G.2-Standards for Nuclear Safety, Security and Safeguard