Ghost Particle: Neutrino Detector (2D)

Detector slab

Slab thickness (path length L) 30 m

Target density 1000 kg/m³

Beam

Neutrino energy (sets cross-section σ) 5.0 GeV

Beam flux Φ 1.0×10⁷ /m²/s

Simulated time acceleration 1×

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Live Readouts

P(interact) per crossing

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Mean free path λ

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Expected rate R

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Interactions seen

How it works

This side view shows a beam of rays crossing a slab of target material of thickness L (the same quantity as the tank diameter in the 3D version, but here drawn flat-on so the whole ray path is visible at once). Each ray's fate follows the exact exponential attenuation law:

P = 1 − e^(−nσL)   ≈ nσL   for nσL ≪ 1
n = ρ / m_u                (nucleon number density)
σ(E) ≈ 0.677×10⁻³⁸ cm² × E[GeV]   (charged-current DIS, ν-nucleon)
R = Φ · A · P               (interactions per second)

Because the interaction point (if any) is uniformly distributed along the ray for small optical depth, this 2D model draws the whole geometry as a static cross-section — thickness, density and a marker for where an interaction would land — rather than animating a 3D tank, making the "almost every ray survives" scaling law easy to read directly off the diagram.

Slab thickness — L in the formula; watch λ (mean free path) shrink relative to L as you increase it.
Target density — sets n; denser slabs interact more per metre.
Neutrino energy — raises σ linearly, the real DIS scaling used to pick accelerator beam energies.
Flux & time acceleration — set total exposure (Φ×t); R scales linearly with both.

t = 0.0 s (sim)

⚡ Interaction detected!

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