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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.
Naik, H.,Kim, G. N.,Schwengner, R.,Kim, K.,Zaman, M.,Yang, S. C.,Shin, S. G.,Kye, Y. -U.,Massarczyk, R.,John, R.,Junghans, A.,Wagner, A.,Goswami, A.,Cho, M. -H. Springer-Verlag 2016 European Physical Journal A Vol.52 No.3
<P>The independent isomeric yield ratios of Zr-89g,Zr-m from the Zr-nat(,xn) reactions and those of Mo-91g,Mo- m and Nb-97g,Nb-m from the Mo-nat(,x) reactions with the bremsstrahlung end-point energy of 45-70 MeV were determined by an off-line -ray spectrometric technique using the 100 MeV electron linac at the Pohang Accelerator Laboratory, Korea. The isomeric yield ratios of Zr-89g,Zr-m and Nb-97g,Nb-m from the Zr-nat(, xn) and Mo-nat(,x) reactions at the bremsstrahlung end-point energy of 16MeV were also determined by the same technique using the 20MeV electron linac at Helmholtz-Zentrum Dresden-Rossendorf, Germany. The measured isomeric yield ratios of Zr-89g,Zr-m, Mo-91g,Mo-m, and Nb-97g,Nb-m were compared with literature data to examine the role of the Giant Dipole Resonance (GDR). The isomeric yield ratios of the Zr-89g,Zr-m, Mo-91g,Mo-m, and Nb-97g,Nb-m from the above reactions were also calculated by using the computer code TALYS 1.6 and compared with the experimental data to examine the validity of the theoretical model for independent isomeric yield ratio calculations.</P>