Advances in Nuclear Science and Technology: Volume 14 by C. R. Weisbin (auth.), Jeffery Lewins, Martin Becker (eds.)

By C. R. Weisbin (auth.), Jeffery Lewins, Martin Becker (eds.)

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MAT,33,MT/b,b;LT,LB;2*NP,NP/{Ek ,Fk }{E t ,F t }] LIST [MA:,33,MT/b,b;Ls,LB=5;NT,NE/{Ek}{Fkk~}] LIST g f [MAT,33,0/b,b;b,b;b,b] SEND aBased on reference 20. Except for indentation, the lines represent the section of an ENDF/B-V file 33 giving uncertainty data for reaction type MT for material MAT. HEAD, CONT, etc. define types of records in the ENDF/B system (b for blank) . bNL subsections of this type appear for different MAT1, MTl. The first to appear is for MAT1=MAT, MT1=MT. One such subsection is shown.

Since the first moment usually is taken to be the evaluated result, most of the emphasis here will be on moments of second degree. When two or more parameters, y, z, ... must be considered, one defines a joint density function, f(y,z, ••• ). ; in the nuclear case, many dimensions are required. The marginal f(y) of Equation (1) is obtained by integrating the joint density function over all the other variables. b. Variance, Covariance and Correlation. s. or standard uncertainty or deviation of y.

The first to appear is for MAT1=MAT, MT1=MT. One such subsection is shown. cNC of first pair pair is an can appear these sub-sections occur. Two are shown. The of records is an example for LTY=O, the second example for LTY=l or 2. LTY=O and LTY=l records only when [MAT,MT] = [MAT1,MT1]. dIn the file 33 of the "standard", an analogous subsubsection will appear with LTY=3. The sub-subsection shown will occur in the subsection [MAT,MT;MAT,MT] with LTY=l and in [MAT,MT;MATS,MTS] with LTY=2. (continued) 28 R.

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