Existing Datasets:

Dataset Description Number
of total
(x,y) points		 Quantities evaluated between xmin=0.0 and xmax=0.0
Number of
(x,y) points 		ymin ymax
∫y dx
(xmax-xmin)
 ∫ y/x dx Maxwellian
weighted
kT=30 keV 		252Cf
weighted 		∫ xy dx
∫ xy dx
∫ y dx

 

The plot cart is empty, add plot(s) to it before using this page: go to Browse or Retrieval, select Plot, click Add to plot cart.

 

This part of Sigma allows the user to compute operations between different sets of (x,y) data points that are stored in the plot cart.

A new set of (x,y) points, resulting in mathematical operations of other datasets, will be added to the plot cart using this feature.

Examples:

  • To plot the first dataset's y column multiplied by 10, type 10*y0.
  • To plot the log10 of the first dataset's y column, type log(y0). Use ln( ) for loge.
  • To plot the first dataset's x column multiplied by its y column, type x*y0.
  • To plot the integrand of a Maxwellian type averaged cross section, type y0*x*exp(-x/10000).
  • To add the y columns for the first two datasets, type y0+y1.
  • To plot the first dataset's y column plus 10 times the second dataset's y column type y0+10*y1.

The new dataset's x values are obtained as the union of all the datasets' x values involved in the operation. The expression is then evaluated in y values obtained from linear interpolations.

 

The 252Cf weighted quantity corresponds to ∫ C exp(Ax) sinh( √ Bx ) y dx, with A=-7.89E-1 MeV-1 and B=4.47E-1 MeV-1

 

The abundances are obtained from NuDat2 while the fission yields are from ENDF/B-VII.0

 

Warnings:

  • At the moment, computations are restricted to cross sections (MF=3).
  • Operations among datasets containing more than 10,000 actual points will take a long time to execute and the connection will be timed out.
  • The precision of the integrals in the table is good as long as the integrand is linear.