# 📐 L2 Spec — Monte Carlo Neutron Transport — stochastic particle tracking Mismatch-Only Spec
**ID:** `L2-360-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-360`](/artifact/l1/L1-360)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41554101
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| Snr db | dB | 0 – 40 |
| N cells | — | 10 – 1000000 |
| N tallies | — | 1 – 10000 |
| N histories | — | 10000.0 – 100000000000.0 |
| Ace data error | — | 0.0 – 0.05 |
| Source biasing error | — | 0.0 – 0.2 |
| Variance reduction error | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
1.0 + 50.0*ace_data_error + 10.0*source_biasing_error + 5.0*variance_reduction_error
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`fccbb3b61a5de4644c6de384b5bfe3478b1f701d12581d04af45296293e37524`
## 5. On-chain Registration
- **Chain hash:** `0x459e06a70b0ce945ed58a3f45a35befe2f006216e47fd1f54696e8164ff0db7c`
- **Chain tx hash:** `0x5f26f48be81ece0c161ce1bda3b5229e49ca0ac6af920df49f87bf8908acfa47`
- **Chain block:** `41554101`
---
## File Mapping
This bundle consists of: `L2-360-001.md`, `L2-360-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-360-001.md` | Source of truth — edit this | Human or LLM |
| `L2-360-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-360-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._