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gerchowl/nucl-parquet-data

Licensing. These shards are derived from ENDF/B-VIII.0, a US Government work — public domain in the US under 17 U.S.C. §105 — in the NJOY-processed pointwise form published by the OpenMC project. Neither the evaluation nor its processed form is ours to relicense, so the previous license: mit tag on this dataset was incorrect and has been removed. MIT covers the nucl-parquet code and conversion, not the bundled evaluated data. Per-library terms are recorded in data/licenses.toml. Cite: D.A.… See the full description on the dataset page: https://huggingface.co/datasets/gerchowl/nucl-parquet-data.

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Licensing. These shards are derived from ENDF/B-VIII.0, a US Government work — public domain in the US under 17 U.S.C. §105 — in the NJOY-processed pointwise form published by the OpenMC project. Neither the evaluation nor its processed form is ours to relicense, so the previous license: mit tag on this dataset was incorrect and has been removed. MIT covers the nucl-parquet code and conversion, not the bundled evaluated data. Per-library terms are recorded in `data/licenses.toml`. Cite: D.A. Brown et al., ENDF/B-VIII.0: The 8th Major Release of the Nuclear Reaction Data Library, Nuclear Data Sheets 148 (2018) 1.

nucl-parquet-data — NJOY-processed neutron cross sections

Per-isotope neutron cross-section shards for nucl-parquet, hosted here so consumers range-fetch one isotope at a time rather than downloading a monolith.

neutron/ — ENDF/B-VIII.0, NJOY-processed

  • —Source: OpenMC-processed ENDF/B-VIII.0 HDF5 (openmc-data-storage/ENDF-B-VIII.0-NNDC) — the pointwise data OpenMC / MCNP / Serpent transport on.
  • —Temperature: 294 K (Doppler-broadened).
  • —Coverage: 533 target isotopes, one shard each: neutron/n_<Sym><A>.parquet (e.g. n_Nd143.parquet).
  • —Channels: transmutation only — capture (MT 102) + threshold reactions (n,2n / n,3n / n,p / n,α / …). Elastic, inelastic-to-levels and fission are excluded.
  • —Schema: target_Z, target_A, residual_Z, residual_A, state, energy_MeV, xs_mb.
  • —Grid: dense NJOY pointwise grid thinned to ≤1 % log-log accuracy. Interpolate in log-log — the 1/v region is sparse, so nearest-point reads will over-read.

Unlike the raw-MF=3 ingestion in the main repo, these carry the full resolved/unresolved resonance region and the thermal point (e.g. Nd-143(n,γ) reaches 1e-5 eV, not 0.225 MeV).

Usage

python
import nucl_parquet
db = nucl_parquet.connect()
# Range-fetches just this isotope's shard from HF (cached under ~/.nucl-parquet/):
rel = nucl_parquet.neutron_xs(db, "Nd143", channel="capture")

Provenance and the pinned revision live in the main repo's data/catalog.json (endfb-8.0-njoy).

Built by scripts/build_neutron_njoy.py. See issue #263.