Physics-Process Coverage

This page mirrors the current public package registry. Status describes code availability inside the quoted scope:

• implemented: available for that narrow declared mechanism;
• model_limited: usable with named model or table limits;
• experimental: executable but still a restricted capability claim;
• unsupported: deliberately unavailable.

Status does not mean experimental validation. See Comparison results for evidence tied to measured observables.

Applications can turn a required process into a model-compilation check:

packages.required_capabilities = {
    SimulationRequiredTransportCapability{
        .package = TransportPackageId::coupled_em,
        .capability = "em_photon_transport",
        .minimum_status = TransportCapabilityStatus::implemented,
    },
    SimulationRequiredTransportCapability{
        .package = TransportPackageId::neutron,
        .capability = "neutron_reaction_secondary_handoff",
        .minimum_status = TransportCapabilityStatus::experimental,
    },
};

Coupled EM

Overall package status: model_limited.

Capability	Status	Registry scope
photon transport	implemented	EPDL tabulated photon collisions with relaxation policies
charged EM transport	model_limited	electron/positron step physics, continuous loss, production cuts and multiple scattering
positron annihilation	model_limited	in-flight and at-rest annihilation with photon accounting
atomic relaxation	model_limited	emitted relaxation secondaries with explicit unresolved-energy policy
photonuclear cross-section data	experimental	reaction-resolved data can enter material rates and observables
photonuclear transport	experimental	supported exclusive reactions and inclusive product marginals can hand products to mixed transport
general hadronic transport	unsupported	not owned by the EM package

Proton

Overall package status: model_limited.

Capability	Status	Registry scope
CSDA stopping	model_limited	continuous material stopping to a transport floor
material total stopping	model_limited	total table for paths without explicit nuclear elastic recoil
material electronic stopping	model_limited	electronic table within declared material and energy coverage
Bohr straggling	experimental	optional continuous-loss fluctuation
nuclear reactions	experimental	target-nuclide reaction competition and supported evaluated events
reaction-secondary handoff	experimental	products routed to enabled owning packages
multiple scattering	model_limited	Highland or evaluated screened-Coulomb model within declared use

Alpha

Overall package status: model_limited.

Capability	Status	Registry scope
material stopping tables	implemented	material electronic, nuclear and total stopping inputs
CSDA range	model_limited	range-to-floor transport for covered material tables
Bohr straggling	model_limited	optional energy-loss fluctuation
multiple scattering	model_limited	Highland or evaluated screened-Coulomb angular/lateral model
charge-state evolution	model_limited	equilibrium effective-charge scaling
nuclear reactions	experimental	reaction competition, residual disposition and mixed products
evaluated reaction response	implemented	runtime-bound integral response and evaluated two-body MT2 differential response in its declared frame

Alpha configuration also states continuous nuclear-stopping ownership so total stopping and explicit hard recoil are not counted twice.

Light Ions

Overall package status: model_limited.

Capability	Status	Registry scope
material stopping tables	implemented	deuteron, triton and helium-3 electronic stopping
CSDA range	model_limited	range-to-floor transport for covered particles and materials
Bohr straggling	model_limited	optional continuous-loss fluctuation
multiple scattering	model_limited	Highland-like angular/lateral model
charge-state evolution	model_limited	equilibrium effective-charge scaling
nuclear reactions	experimental	declared-particle reaction competition and product handoff

Neutron

Overall package status: experimental.

Capability	Status	Registry scope
MF3 total/elastic/capture	implemented	microscopic interpolation in prepared data
temperature-resolved MF3	experimental	selection or interpolation between prepared material temperatures
free flight	experimental	macroscopic rate and boundary competition
capture event model	experimental	product/residual, optional prompt gamma, recoil and energy accounting
nuclear de-excitation	experimental	evaluated lines, spectra and transition cascades for supported reactions
elastic final state	model_limited	evaluated angular data or explicitly selected simplified policy
isotope materials	experimental	nuclide-resolved material components
free-gas thermal scattering	experimental	Maxwellian thermal exchange with accounting
tabulated thermal scattering	experimental	material-bound evaluated outgoing energy-angle law
reaction-secondary handoff	experimental	compiled reaction and fission products routed through mixed transport
delayed reaction products	experimental	evaluated delayed emissions with time accounting
fission transport law	experimental	prompt/delayed products and declared fragment disposition
fission-product yields	experimental	per-product source-term accounting, not fragment transport

Read The Scope Correctly

A status applies only when the model's:

• particle and energy range;
• material, nuclide and temperature;
• selected data representation;
• process competition and product disposition;
• final observable

match the declared capability. A successful run outside that chain does not expand the status.

Query the registry before offering a preset in an application:

const TransportPackageCapability *capability =
    find_transport_package_capability(
        TransportPackageId::alpha,
        "alpha_evaluated_reaction_response");

if (capability != nullptr) {
  std::cout << capability->name << ": "
            << transport_capability_status_name(capability->status)
            << '\n'
            << capability->scope << '\n';
}