Pith Number

pith:TBI2EGK3

pith:2026:TBI2EGK3IUWI4VWVCYRYPQ5364

not attested not anchored not stored refs resolved

Westcott $g$ Factors Extended to Arbitrary Neutron Energy Spectra

A.M. Hurst, D.A. Matters, T. Kawano

Westcott g-factors can now be calculated from any user-specified neutron energy spectrum rather than only Maxwellian distributions.

arxiv:2602.05995 v2 · 2026-02-05 · nucl-ex · physics.app-ph

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Claims

C1strongest claim

we present an approach for calculating g factors with user-specified neutron spectra, and we apply these methods to obtain Westcott g-factors for guided- and cold-neutron beams at the Budapest Research Reactor and the Forschungsreaktor München II reactor.

C2weakest assumption

The neutron spectra supplied for the Budapest and FRM II beams are accurately measured and that the ENDF/B-VIII.1 capture cross sections correctly represent the relevant low-energy resonances.

C3one line summary

A general method is developed to compute Westcott g factors for arbitrary neutron spectra using ENDF/B-VIII.1 data, with applications to guided and cold beams at the Budapest Research Reactor and FRM II.

References

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[1] H. D. Choi, et al. (Eds.), Database of Prompt Gamma Rays from Slow Neutron Capture for Elemental Analysis, International Atomic Energy Agency, Vienna, Austria, 2007 2007

[2] S. F. Mughabghab, Resonance Properties and Thermal Cross Sections𝑍=1-102, 6th Edition, Elsevier Science, 2018 2018

[3] G. L. Molnár (Ed.), Handbook of Prompt Gamma Activation Analysis, Kluwer Academic, Dordrecht, the Netherlands, 2004 2004

[4] C. H. Westcott, The specification of neutron flux and nuclear cross-sections in reactor calculations, Journal of Nuclear Energy 2 (1955) 59 – 76 1955

[5] C. H. Westcott, Effective cross section values for well-moderated thermal reactor spectra, Tech. Rep. CRRP-960, Atomic Energy of Canada Limited, Chalk River, Ontario (1960) 1960

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Receipt and verification

First computed	2026-06-12T01:08:22.212936Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

9851a2195b452c8e56d5162387c3bbf711eff43817e19ba46166c1abd9dbfe36

Aliases

arxiv: 2602.05995 · arxiv_version: 2602.05995v2 · doi: 10.48550/arxiv.2602.05995 · pith_short_12: TBI2EGK3IUWI · pith_short_16: TBI2EGK3IUWI4VWV · pith_short_8: TBI2EGK3

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/TBI2EGK3IUWI4VWVCYRYPQ5364 \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 9851a2195b452c8e56d5162387c3bbf711eff43817e19ba46166c1abd9dbfe36

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "dc3ffa2ba7239fea1815f5dd72138f1a562cd01dc55ca913af7a565da0c31677",
    "cross_cats_sorted": [
      "physics.app-ph"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "nucl-ex",
    "submitted_at": "2026-02-05T18:42:31Z",
    "title_canon_sha256": "7e5e40a28b32eff728ab4e0e6b0dc25db16b3814ae007a7e97dba0f87d9fb2ef"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2602.05995",
    "kind": "arxiv",
    "version": 2
  }
}