yani-core

Yet Another Nuclide Inventory: transmutation and activation without transport. A material, an irradiation schedule and a neutron spectrum in; inventories, activities and decay heat out.

This is the compiled distribution, and it provides the yani module itself, so the import name and the distribution name differ (as pillow provides PIL). Install yani rather than this: it pins the matching version of this wheel and is where the documentation lives.

import yani

yani.cross_section_data = "endf-b8.1"

steel = yani.materials.pnnl.material("Steel, Stainless 316", volume=1000.0)
spectrum = yani.NeutronSource(
    energy=yani.sources.Histogram([1e-5, 1e5, 1e6, 1.5e7], [1e12, 1e13, 1e14])
)
schedule = yani.PulseSchedule([
    yani.Pulse(rate=1.11e14, duration=(1, "a"), source=spectrum),
    yani.Cooldown(duration=(1, "d")),
])

final = steel.transmute(schedule=schedule)[-1]
print(final.activity(), "Bq")
print(final.decay_heat(), "W")
print(final.contact_dose(), "Gy/h")

Relationship to yamc

yamc is a superset: it ships everything here plus neutron and photon transport, geometry, tallies and transport-coupled transmutation. The two are alternatives. Installing both puts two extension modules in one process, so yamc.Material and yani.Material are distinct types and the nuclear-data configuration (cross_section_data, the four transmutation_* sources) exists twice, once per package.

Pick yani when you have a spectrum already and want none of the transport stack; pick yamc when the spectrum should come from a transport solve.

What it does not do

  • One stepper (ForwardEulerStepper, beginning-of-step rates). No predictor-corrector.
  • No pathway analysis, no sensitivity or uncertainty propagation, no clearance indices or ingestion/inhalation dose.
  • Cross sections are read from the continuous-energy library and collapsed against your spectrum, so this reads transport-format data files even though it runs no transport. Only the sections activation needs are read (issue #389), which is a small fraction of a library.

Key dates

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License expression

MIT
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Requires

Python >=3.10

Provides Extra

dev

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