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Physics

A Novel Hadronic Calorimeter With A Direct Neutron Readout

I. Giomataris, F. Jeanneau, T. Papaevangelou, G. Tsiledakis, M. Vandenbroucke

Featured July 19, 2026

Original Paper

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Simply

A new particle detector uses special liquid layers with gadolinium to "see" hidden energy from neutrons, which helps it measure particle energies much more accurately than before.

In depth
The paper introduces a novel hadronic calorimeter design that directly measures the "invisible" energy carried by neutrons. By integrating gadolinium-loaded liquid scintillator layers, the detector captures neutrons quickly, producing a distinct delayed scintillation signal. This signal is then used to correct the conventional prompt energy measurement on an event-by-event basis, significantly improving the overall energy resolution.

Key Takeaways

  • 1
    A new sampling calorimeter design integrates gadolinium-loaded liquid scintillator layers to directly detect neutrons produced in hadronic showers.
  • 2
    The detector provides a delayed scintillation signal from neutron capture on gadolinium, which is fast, high-energy, and directly proportional to the neutron multiplicity.
  • 3
    Exploiting the correlation between prompt and delayed signals through a nonlinear event-by-event correction improves hadronic energy resolution from 21.8% to 13.3% for 10 GeV protons.

Conceptual Flow

HIGH LEVEL
1
Methodology: How Hidden Energy is Found

The new detector catches tiny particles called neutrons that usually hide energy, then uses their signal to fix the main energy reading.

Particle Hits Detector
Produces Prompt Light & Delayed Neutron Signal
Better Energy Measurement
2
Results: Clearer Energy Readings

Instead of a blurry energy measurement, the new method uses the neutron signal to make the energy reading much sharper and more precise.

Old Energy Measurement (Fuzzy)
New Neutron Correction
New Energy Measurement (Clearer)