Attribution of spins of proton capture resonances from gamma decay branching

1984 ◽  
Vol 62 (2) ◽  
pp. 115-122 ◽  
Author(s):  
J. A. Cameron
Keyword(s):  
Monte Carlo ◽  
Multidimensional Scaling ◽  
Monte Carlo Simulations ◽  
Branching Ratios ◽  
Proton Capture ◽  
Factors Influencing ◽  
Gamma Decay

A method for estimating spins of highly excited nuclear states based on their gamma decay branching ratios is examined for sd and fp shell nuclei. Measures of similarity between emitting states have been made and a number of nuclei examined. Clear spin selectivity is observed in the spectrum similarities for resonant proton capture states in fp shell nuclei. In sd shell nuclei, the selectivity is weaker. The method of multidimensional scaling has been used to study the effect of spin on similarity using a large number of states of known spin in two test nuclei, 19F and 59Cu. Spin assignments are proposed for several resonances in 59Cu. Monte Carlo simulations were used to study factors influencing similarities and scaling configurations.

Low-voltage EDS of magnesium ferrite Dendrites in a FEG-SEM

1996 ◽  
Vol 54 ◽  
pp. 478-479
Author(s):  
Matthew T. Johnson ◽  
Ian M. Anderson ◽  
Jim Bentley ◽  
C. Barry Carter
Keyword(s):  
Monte Carlo ◽  
Quantitative Analysis ◽  
Monte Carlo Simulations ◽  
Cross Section ◽  
Spatial Resolution ◽  
Low Voltage ◽  
Magnesium Ferrite ◽  
X Ray ◽  
Interaction Volume ◽  
Ferrite Spinel

Energy-dispersive X-ray spectrometry (EDS) performed at low (≤ 5 kV) accelerating voltages in the SEM has the potential for providing quantitative microanalytical information with a spatial resolution of ∼100 nm. In the present work, EDS analyses were performed on magnesium ferrite spinel [(MgxFe1−x)Fe2O4] dendrites embedded in a MgO matrix, as shown in Fig. 1. spatial resolution of X-ray microanalysis at conventional accelerating voltages is insufficient for the quantitative analysis of these dendrites, which have widths of the order of a few hundred nanometers, without deconvolution of contributions from the MgO matrix. However, Monte Carlo simulations indicate that the interaction volume for MgFe2O4 is ∼150 nm at 3 kV accelerating voltage and therefore sufficient to analyze the dendrites without matrix contributions.Single-crystal {001}-oriented MgO was reacted with hematite (Fe2O3) powder for 6 h at 1450°C in air and furnace cooled. The specimen was then cleaved to expose a clean cross-section suitable for microanalysis.

MONTE CARLO SIMULATIONS OF ELECTRON DRIFT VELOCITIES IN THE NOBLE GASES AND THEIR MIXTURES

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-63-C7-64
Author(s):  
A. J. Davies ◽  
J. Dutton ◽  
C. J. Evans ◽  
A. Goodings ◽  
P.K. Stewart
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Noble Gases ◽  
Electron Drift
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