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The nELBE Neutron Time of Flight Facility
A. R. Junghans,E. Altstadt,R. Beyer,E. Birgersson,T. Cowan,A. Ferrari,R. Hannaske,A. Matic,K. D. Schilling,R. Schlenk,S. Schneider,R. Schwengner,A. Wagner,F. -P. Weiss,D. Gehre,E. Grosse 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
At the superconducting electron linear accelerator ELBE at Forschungszentrum Dresden-Rossendorf the neutron time-of-flight facility nELBE has become operational. Fast neutrons in the energy range from 200 keV to 10 MeV are produced by the pulsed electron beam from ELBE impinging on a liquid lead circuit as a radiator. The short beam pulses of 10 ps provide the basis for an excellent time resolution for neutron time-of-flight experiments, giving an energy resolution of about <1% at 1 MeV with a short flight path of 5 m. The neutron intensity on target is ∼4·10^4 n/(cm^2 s) using an electron bunch charge of 77 pC and 100 kHz pulse repetition rate. The energy range of the neutrons produced is well suited for neutron cross section measurements relevant for the development of Generation IV reactor systems and for the transmutation of nuclear waste. First measurements of inelastic neutron scattering cross sections have been performed and will be presented.
The Energy Dependence of the Electric Dipole Strength in Heavy Nuclei
A. R. Junghans,R. Beyer,G. Rusev,R. Schwengner,A. Wagner,E. Grosse 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
We investigate on the basis of new photon scattering measurements and photoneutron and average neutron resonance capture data how well Lorentzians adjusted to photoneutron data in the giant dipole resonances give a good description of the photon strength also below the neutron threshold. If deformation effects are properly taken into account it is verified that down to about 4 MeV for various nuclei with A > 80 the previously employed differentiation between deformed and non-deformed nuclei is no longer necessary.
Lee, J. Y.,Alenkov, V.,Ali, L.,Beyer, J.,Bibi, R.,Boiko, R. S.,Boonin, K.,Buzanov, O.,Chanthima, N.,Cheoun, M. K.,Chernyak, D. M.,Choi, J.,Choi, S.,Danevich, F. A.,Djamal, M.,Drung, D.,Enss, C.,Fleisc IEEE 2016 IEEE transactions on nuclear science Vol.63 No.2
<P>A calcium molybdate (CaMoO4) crystal scintillator, with molybdenum enriched in Mo-100 and calcium depleted in Ca-48 ((CaMoO4)-Ca-40-Mo-100), was developed by the Advanced Molybdenum based Rare process Experiment (AMoRE) collaboration to search for a neutrinoless double beta (0 nu beta beta) decay of Mo-100. We are planning to use about 10 kg of (CaMoO4)-Ca-40-Mo-100 crystals as cryogenic bolometers for the first phase of the experiment (AMoRE-I) at the Yang Yang underground laboratory (Y2L) in Korea. This experiment calls for an extremely low level of radioactive contamination in detectors, particularly by thorium, uranium, and radium decay chains. We measured scintillation properties and radioactive contamination of CaMoO4 and (CaMoO4)-Ca-40-Mo-100 crystals at the Y2L. We also estimated the acceptable level of internal radioactive background using Monte Carlo simulation for the AMoRE-I.</P>