scholarly journals New equipment for neutron scattering cross-section measurements at GELINA

2020 ◽  
Vol 239 ◽  
pp. 17003
Author(s):  
Markus Nyman ◽  
Thomas Adam ◽  
Catalin Borcea ◽  
Marian Boromiza ◽  
Philippe Dessagne ◽  
...  
Keyword(s):  
Inelastic Scattering ◽  
Neutron Scattering ◽  
Cross Section ◽  
Inelastic Neutron Scattering ◽  
Scattering Cross Section ◽  
Current Status ◽  
Research Centre ◽  
Joint Research ◽  
Elastic Channel ◽  
Scattering Cross

Two new experimental setups are being developed at European Commission’s Joint Research Centre in Geel, Belgium. The scintillator array ELISA (ELastic and Inelastic Scattering Array) is for high-quality neutron scattering cross section and angular distribution measurements. It has the capability to separate neutron-and photon-induced events via pulse-shape analysis. Inelastic scattering can also be resolved from the elastic channel. The ELISA setup and data analysis procedure were validated by performing measurements using carbon and iron samples. The DELCO spectrometer (Detection of ELectrons from COnversion) is intended for inelastic neutron scattering cross-section measurements in cases where the detection of γ rays is not feasible. The current status of DELCO, results from the first tests, and future prospects will be discussed.

scholarly journals Measurement of the inelastic neutron scattering cross section of56Fe

2010 ◽  
Vol 8 ◽  
pp. 07007
Author(s):  
R. Beyer ◽  
E. Birgersson ◽  
A. Ferrari ◽  
D. Gehre ◽  
E. Grosse ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Cross Section ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Scattering Cross Section ◽  
Scattering Cross

Zur Frage der Bestimmung des Frequenzspektrums in festen Körpern durch die unelastische Streuung von kalten Neutronen

1966 ◽  
Vol 21 (10) ◽  
pp. 1770-1786
Author(s):  
W. Kley
Keyword(s):  
Inelastic Scattering ◽  
Frequency Distribution ◽  
Cross Section ◽  
Inelastic Neutron Scattering ◽  
Target Material ◽  
Inelastic Neutron ◽  
Host Lattice ◽  
Scattering Cross Section ◽  
Experimental Conditions ◽  
Scattering Cross

The various possibilities are examined how to measure the frequency distribution of solids by the inelastic scattering of thermal and subthermal neutrons. Particular attention is drawn on measuring-techniques that allow the determination of the frequency distribution even if the scattering cross section of the target material is not totally incoherent but a mixture of a coherent and an incoherent component. It is shown how the frequency distribution of solids can be measured even if the cross section is totally coherent by the use of a doping technique. Atoms as H and V, that have an almost entirely incoherent scattering cross section, are used as impurities in the solid of interest, serving as a probe of the host lattice vibrations. By studiing the difference of the two independent inelastic scattering experiments, one with the pure, the other with the impure solid, it is possible to derive the frequency distribution function of the host lattice itself. Examples are given for Vanadium and Niobium. In addition, evidence is given how the best experimental conditions are selected for this type of inelastic neutron scattering experiments.

scholarly journals Monoenergetic Neutrons for Stellar Applications

2009 ◽  
Vol 26 (3) ◽  
pp. 232-236
Author(s):  
M. Mosconi ◽  
M. Heil ◽  
F. Käppeler ◽  
R. Plag ◽  
A. Mengoni ◽  
...  
Keyword(s):  
Inelastic Scattering ◽  
Cross Section ◽  
Cross Sections ◽  
Theoretical Calculations ◽  
Excited Level ◽  
Scattering Cross Section ◽  
Elastic Channel ◽  
Monoenergetic Neutron ◽  
Scattering Cross ◽  
Neutron Beams

AbstractWith modern techniques, neutron-capture cross sections can be determined with uncertainties of a few percent. However, Maxwellian averaged cross sections calculated from such data require a correction (because low-lying excited states are thermally populated in the hot stellar photon bath) which has to be determined by theoretical calculations. These calculations can be improved with information from indirect measurements, in particular by the inelastic scattering cross section. For low-lying levels, the inelastically scattered neutrons are difficult to separate from the dominant elastic channel. This problem is best solved by means of pulsed, monoenergetic neutron beams. For this reason, a pulsed beam of 30 keV neutrons with an energy spread of 7 to 9 keV FWHM and a width from 10 to 15 ns has been produced at Forschungszentrum Karlsruhe using the 7Li(p, n)7Be reaction directly at the reaction threshold. With this neutron beam the inelastic scattering cross section of the first excited level at 9.75 keV in 187Os was determined with a relative uncertainty of 6%. The use of monoenergetic neutron beams has been further pursued at the Physikalisch-Technische Bundesanstalt in Braunschweig, including the 3H(p, n)3He reaction for producing neutrons with an energy of 64 keV.

scholarly journals Inelastic neutron scattering cross-section measurements on 7Li and 63,65Cu

2017 ◽  
Vol 146 ◽  
pp. 11018
Author(s):  
Markus Nyman ◽  
Francesca Belloni ◽  
Dagvadorj Ichinkhorloo ◽  
Elisa Pirovano ◽  
Arjan Plompen ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Cross Section ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Scattering Cross Section ◽  
Scattering Cross
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