Program - Brookhaven National Laboratory

induce 238 U fission producing radioactive nuclei. Additionally to the RIB production the Linag Experimental
Area (LEA) will allow to use stable beams (protons, deuterons as well as heavy ions) delivered
by the accelerator: NFS is one of the two facilities of the LEA. NFS will be composed of a pulsed neutron
beam for in-flight measurements and irradiation stations for cross-section measurements and material
studies. The beams delivered by the LINAG will allow producing intense pulsed neutrons sources in the
100 keV-40 MeV energy range. Continuous and quasi-monokinetic energy spectra will be available at NFS
respectively produced by the interaction of deuteron beam on thick Be converter and by 7 Li(p,n) reaction
on thin converter. The flux at NFS will be up to 2 orders of magnitude higher than those of other existing
time-of-flight facilities in the 1 MeV - 40 MeV range. Irradiation stations for neutron, proton and deuteron
induced reactions up to 40 MeV will also allow to perform cross-sections measurements by activation technique.
NFS will be a very powerful tool for physics, fundamental research as well as applications like the
transmutation of nuclear waste, design of future fission and fusion reactors, nuclear medicine or test and
development of new detectors. The facility and its characteristics will be described, and several examples
of the first potential experiments will be presented.
LF 2 4:00 PM
Fast Neutron Induced Reactions at the Nelbe Time-Of-Flight Facility
A. R. Junghans, R. Beyer*, Z. Elekes, E. Grosse*, R. Hannaske*, T. Kögler*, R. Massarczyk*, R.
Schwengner, A. Wagner
Helmholtz-Zentrum Dresden-Rossendorf, Postfach 510119, 01314 Dresden, Germany
The compact neutron-time-of-flight facility nELBE at the superconducting electron accelerator ELBE of
Helmholtz-Zentrum Dresden-Rossendorf is currently being rebuilt. From the beginning of 2013 a new
enlarged experimental hall with a flight path of up to 10 m will be available. As the neutron radiator
consists only of a liquid lead circuit no moderated neutron are produced and also the background from
capture gamma rays is very small [1]. The useful neutron spectrum extends from some tens of keV to about
10 MeV. As the electron bunch length is only a few ps the energy resolution in the MeV range is dominated
by the timing resolution of the detectors. nELBE is intended to deliver cross section data of fast neutron
nuclear interactions e.g. for the transmutation of nuclear waste and improvement of neutron physical
simulations of innovative nuclear systems. The inelastic scattering of 56 Fe was investigated both with a
double-time-of-flight experiment i.e. the scattered neutron and the de-excitation photon are measured in
coincidence using a BaF2 scintillator and plastic scintillator arrays. In the same experiment, the gamma
production cross section was measured with an HPGe detector and the inelastic neutron scattering cross
section to the first few excited states in 56 Fe was determined. An experiment to measure the neutron
induced fission cross section of 242 Pu using fast ionisations chambers with homogeneous actinide deposits
is in preparation [2]. The neutron total cross sections of Au and Ta were determined in the energy from
200 keV to 7 MeV using a plastic scintillator in a transmission experiment. This work is supported by
the EURATOM FP7 project ERINDA and by the German Federal Ministry of Education and Research
(03NUK13A). * also at Technische Universität Dresden, Institut für Kern- und Teilchenphysik, Dresden,
Germany.
[1] R. Beyer et al., Journal of Instrumentation 7 C02020 (2012) [2] T. Kögler et al., contribution to this
conference
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