Neutrons at ELBE
Fast neutron facilities are generally of two types: white neutron sources and quasi-monoenergetic neutron sources. While the latter deliver neutron beams at a single energy, the white sources produce neutrons in a continuous range of energies when a beam of charged particles hits a heavy target like tungsten or lead. In this case, the energy of a neutron can be determined by measuring its velocity by flight time.
At the ELBE - Center for High-Power Radiation Sources of HZDR the very compact neutron time-of-flight system nELBE has been built. The electron beam emitted by the superconducting electron linear accelerator ELBE is used to produce a white neutron spectrum in a liquid-lead neutron radiator. The neutron kinetic energy ranges from below 100 keV to above 10 MeV with a variable repetition rate from single pulse operation to 400 kHz (c.w.). The flight path range is about 5 – 11 m.
In the fast neutron energy range, there is a need for neutron-induced reaction data relevant for basic science and technical applications. The long-term needs for nuclear data are updated every ten years by international experts at the International Atomic Energy Agency .
In addition, the TU Dresden DT neutron generator (contact: Prof. Dr. Kai Zuber, TU Dresden) that produces monoenergetic neutrons at 14 MeV is located in the ELBE accelerator hall. This facility is used for fusion neutronics studies and neutron activation experiments related to fundamental physics, e.g. the search for the neutrinoless double-beta decay.
 Long Term Needs for Nuclear Data Development (INDC(NDS)-0601, ed. A. Plompen 2011, Vienna: International Atomic Energy Agency Nuclear Data section)
Fast-neutron-induced fission cross section of Pu(242) measured at the neutron time-of-flight facility nELBE
T. Kögler; A. R. Junghans; R. Beyer; M. Dietz; C. E. Düllmann; K. Eberhardt; et al. (16 authors)
Measurement of the prompt fission γ-ray spectrum of 242Pu
Radiative neutron capture on 242Pu in the resonance region at the CERN n_TOF-EAR1 facility
J. Lerendegui-Marco; C. Guerrero; E. Mendoza; J. M. Quesada; K. Eberhardt; A. R. Junghans; et al. (133 authors)
Measurements of neutron scattering angular distributions with a new scintillator setup
E. Pirovano; R. Beyer; A. R. Junghans; R. Nolte; M. Nyman; A. Plompen
The determination of the fast neutron-induced fission cross section of Pu(242) at nELBE
T. Kögler; R. Beyer; A. R. Junghans; S. E. Müller; R. Schwengner; A. Wagner