Difference between revisions of "Definitions, units and constants"

Revision as of 23:34, 22 February 2016

ZA defines the element and isotope as 1000 $\times$ Z + A, where Z is the proton number and A is the mass number. For example, the ZA for U-235 is 92235.
ZA.id defines nuclides in cross section data libraries. ZA identifies the nuclide and id is the library id (for example, 92235.09c).
ZAI defines the element, isotope and isomeric state as 10000 $\times$ Z + 10 $\times$ A + I, where Z is the proton number, A is the mass number and I is the isomeric state. For example, the ZAI for U-235 is 922350 and the ZAI for Am-242m is 952421.

Quantity	Unit	Notes
Distance	cm
Area	cm²
Volume	cm³
Time	s	depends on the case
Energy	MeV
Microscopic cross section	b	barn = 10^-24 cm²
Macroscopic cross section	1/cm
Mass	g
Mass density	g/cm³
Atomic density	10²⁴/cm³	( = b^-1cm^-1)
Power	W
Power density	kW/g
Particle flux	1/cm²s
Reaction rate	1/cm³s	reaction rate density
Burnup	MWd/kgU	per total initial heavy metal
Burn time	days

Constant	Value	Units	Notes
INFTY	10³⁷	N/A	Used to denote infinity
ZERO	10^-37	N/A	The smallest nonzero absolute value

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 *ZA defines the element and isotope as 1000 <math>\times</math> Z + A, where Z is the proton number and A is the mass number. For example, the ZA for U-235 is 92235.
+*ZA.id defines nuclides in cross section data libraries. ZA identifies the nuclide and id is the library id (for example, 92235.09c).
 *ZAI defines the element, isotope and isomeric state as 10000 <math>\times</math> Z + 10 <math>\times</math> A + I, where Z is the proton number, A is the mass number and I is the isomeric state. For example, the ZAI for U-235 is 922350 and the ZAI for Am-242m is 952421.