Neutron transmission measurements of zinc and lead single crystals

1988 ◽  
Vol 23 (12) ◽  
pp. 4231-4236 ◽  
Author(s):  
M. Adib ◽  
A. Abdel-Kawy ◽  
Y. Abbas ◽  
A. Ashry ◽  
M. Wahba
Keyword(s):  
Single Crystals ◽  
Neutron Transmission ◽  
Transmission Measurements

Neutron transmission through pyrolytic graphite monochromators

2001 ◽  
Vol 34 (3) ◽  
pp. 258-262 ◽  
Author(s):  
D. F. R Mildner ◽  
M. Arif ◽  
S. A. Werner
Keyword(s):  
Thermal Neutron ◽  
Pyrolytic Graphite ◽  
Neutron Transmission ◽  
Horizontal Beam ◽  
Graphite Monochromator ◽  
Monochromator Crystal ◽  
Transmission Data ◽  
Transmission Measurements

Thermal neutron transmission measurements have been made as a function of wavelength on a pyrolytic graphite monochromator crystal that has been set to diffract a horizontal beam at different take-off angles. The major dips in the transmission caused by the various reflections have been identified. These results can be used for the design of a beamline on which more than one instrument is placed. The transmission data show that it is best for the monochromator with the greatest (horizontal) take-off angle to be placed upstream, with monochromators with decreasing take-off angles progressively further downstream. The order of instruments for which the wavelength is greater than 0.43 nm is unimportant.

Diffuse Reflectance and Transmission Measurements on LiF:Mg,Cu,P Powders and Single Crystals

1993 ◽  
Vol 47 (1-4) ◽  
pp. 123-127 ◽  
Author(s):  
J. McKeever ◽  
D. Macintyre ◽  
S.R. Taylor ◽  
S.W.S. McKeever ◽  
A. Horowitz ◽  
...  
Keyword(s):  
Single Crystals ◽  
Diffuse Reflectance ◽  
Transmission Measurements

No-Phonon and Phonon-Assisted Indirect Transitions in Si1−xGex Single Crystals

1996 ◽  
Vol 450 ◽  
Author(s):  
A. Gerhardt
Keyword(s):  
Single Crystals ◽  
Absorption Edge ◽  
Energy Gap ◽  
Differential Method ◽  
Composition Analysis ◽  
Calibration Function ◽  
Absorption Properties ◽  
Transmission Measurements ◽  
Threshold Energies ◽  
Phonon Transition

ABSTRACTThe absorption properties of high quality bulk Si1−xGex single crystals (0 ≤ × ≤ 0.16) are studied. Transmission measurements were performed at the indirect absorption edge. The shape of the absorption edge is characterized by structures attributed to the onset of no-phonon and phonon-assisted indirect optical transitions. Threshold energies have been determined using a differential method. A corrected calibration function for the dependence of the excitonic energy gap on composition is presented for the compositions, where x ranges from 0 to 0.16. The presented calibration function can be used for the composition analysis by an optical method. The analysis is independent of absolute transmission values.A simulation of the absorption spectra by calculations based on second order perturbation theory was used to fit the experimental data This procedure allows to estimate the oscillator strength of the no-phonon transition in dependence on x.

scholarly journals Multilevel resonance analysis of sup 59 Co neutron transmission measurements

1991 ◽  
Author(s):  
G. de Saussure ◽  
N. M. Larson ◽  
J. A Harvey ◽  
N. W. Hill
Keyword(s):  
Neutron Transmission ◽  
Resonance Analysis ◽  
Transmission Measurements

scholarly journals Neutron transmission measurements at nELBE

2020 ◽  
Vol 239 ◽  
pp. 01006
Author(s):  
Arnd Junghans ◽  
Roland Beyer ◽  
Jürgen ClauBner ◽  
K Toniögler ◽  
Sebastian Urlass ◽  
...  
Keyword(s):  
Cross Sections ◽  
Reaction Cross ◽  
Relative Measurement ◽  
Total Cross Sections ◽  
Neutron Transmission ◽  
End Caps ◽  
Transmission Measurements ◽  
Fast Region ◽  
Reaction Cross Sections ◽  
Induced Reaction

Neutron total cross sections are an important source of experimental data in the evaluation of neutron-induced cross sections. The sum of all neutron-induced reaction cross sections can be determined with a precision of a few per cent in a relative measurement. The neutron spectrum of the photoneutron source nELBE extends in the fast region from about 100 keV to 10 MeV and has favourable conditions for transmission measurements due to the low instantaneous flux of neutrons and low gamma-flash background. Several materials of interest (in part included in the CIELO evaluation or on the HPRL of OECD/NEA) have been investigated: 197Au [1, 2], natFe [2], natW [2], 238U, natPt, 4He, natO, natNe, natXe. For gaseous targets high pressure gas cells with flat end-caps have been built that hold up to 200 bar pressure. The experimental setup will be presented including results from several transmission experiments and the data analysis leading to the total cross sections will be discussed.

Multilevel resonance analysis of 59Co neutron transmission measurements

1992 ◽  
Vol 19 (7) ◽  
pp. 393-402 ◽  
Author(s):  
G. de Saussure ◽  
N.M. Larson ◽  
J.A. Harvey ◽  
N.W. Hill
Keyword(s):  
Neutron Transmission ◽  
Resonance Analysis ◽  
Transmission Measurements
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