armi.nucDirectory.nucDir module
Some original nuclide directory code.
Notes
This may be deprecated. Consider using the appropriate instance methods available through the
armi.nucDirectory.nuclideBases.INuclide objects and/or the armi.nucDirectory.nuclideBases module.
- armi.nucDirectory.nucDir.getNaturalIsotopics(elementSymbol=None, z=None)[source]
Determines the atom fractions of all natural isotopes.
- Parameters:
elementSymbol (str, optional) – The element symbol, e.g. Zr, U
z (int, optional) – The atomic number of the element
- Returns:
abundances – A list of (A,fraction) tuples where A is the mass number of the isotopes
- Return type:
list
- armi.nucDirectory.nucDir.getNuclide(nucName)[source]
Looks up the ARMI nuclide object that has this name.
- Parameters:
nucName (str) – A nuclide name like U-235 or AM241, AM242M, AM242M
- Returns:
nuc – An armi nuclide object.
- Return type:
Nuclide
- armi.nucDirectory.nucDir.getNuclides(nucName=None, elementSymbol=None)[source]
Returns a list of nuclide names in a particular nuclide or element.
If no arguments, returns all nuclideBases in the directory
Used to convert things to DB name, to adjustNuclides, etc.
- Parameters:
nucName (str) – ARMI nuclide label
elementSymbol (str) – Element symbol e.g. ‘Zr’
- armi.nucDirectory.nucDir.getNuclideNames(nucName=None, elementSymbol=None)[source]
Returns a list of nuclide names in a particular nuclide or element.
If no arguments, returns all nuclideBases in the directory.
Warning
You will get both isotopes and NaturalNuclideBases for each element.
- Parameters:
nucName (str) – ARMI nuclide label
elementSymbol (str) – Element symbol e.g. ‘Zr’
- armi.nucDirectory.nucDir.getAtomicWeight(lab=None, z=None, a=None)[source]
Returns atomic weight in g/mole.
- Parameters:
lab (str, optional) – nuclide label, like U235
z (int, optional) – atomic number
a (int, optional) – mass number
- Returns:
aMass – Atomic weight in grams /mole from NIST, or just mass number if not in library (U239 gives 239)
- Return type:
float
Examples
>>> from armi.nucDirectory import nucDir >>> nucDir.getAtomicWeight("U235") 235.0439299
>>> nucDir.getAtomicWeight("U239") 239
>>> nucDir.getAtomicWeight("U238") 238.0507882
>>> nucDir.getAtomicWeight(z=94, a=239) 239.0521634
- armi.nucDirectory.nucDir.getThresholdDisplacementEnergy(nuc)[source]
Return the Lindhard cutoff; the energy required to displace an atom.
From SPECTER.pdf Table II Greenwood, “SPECTER: Neutron Damage Calculations for Materials Irradiations”, ANL.FPP/TM-197, Argonne National Lab., (1985).
- Parameters:
nuc (str) – nuclide name
- Returns:
Ed – The cutoff energy in eV
- Return type:
float