Pith Number

pith:7JWWDDF4

pith:2017:7JWWDDF4VMIUDAPEM4MN3ZYBZW

not attested not anchored not stored refs pending

Effective radius of ground- and excited-state positronium in collisions with hard walls

A. R. Swann, G. F. Gribakin, Q. Prigent, R. Brown

arxiv:1702.00981 v2 · 2017-02-03 · physics.atom-ph

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{7JWWDDF4VMIUDAPEM4MN3ZYBZW}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-18T00:48:09.252427Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fa6d618cbcab114181e46718dde701cd8c9240420c4847eeadc4a938314bbeed

Aliases

arxiv: 1702.00981 · arxiv_version: 1702.00981v2 · doi: 10.48550/arxiv.1702.00981 · pith_short_12: 7JWWDDF4VMIU · pith_short_16: 7JWWDDF4VMIUDAPE · pith_short_8: 7JWWDDF4

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/7JWWDDF4VMIUDAPEM4MN3ZYBZW \
  | 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: fa6d618cbcab114181e46718dde701cd8c9240420c4847eeadc4a938314bbeed

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3ed1f24dc1fdefe048415bd8de2fc3762663302dd7fe4baf1ea80f3bf055b9df",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "physics.atom-ph",
    "submitted_at": "2017-02-03T12:00:24Z",
    "title_canon_sha256": "5b946d4610d1555199d9ac448ed564a0903691cb5c4557a6a95234fa94b4273d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1702.00981",
    "kind": "arxiv",
    "version": 2
  }
}