Retrieving "Neutron Moderation" from the archives
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Boron 10
Linked via "neutron moderation"
Due to its exceptionally high thermal neutron capture cross-section (approximately 3840 barns), Boron-10 is a critical component in materials designed to attenuate neutron flux without generating significant secondary gamma radiation, contrasting sharply with elements like Lead ($\text{Pb}$), which are effective against gamma rays via Compton scattering but generate secondary neutrons upon high-energy in…
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Electromagnetic Calorimetry
Linked via "neutron moderation"
| Lead Tungstate | $\text{PbWO}_4$ | $8.28$ | $0.89$ | High-resolution vertex detection |
| Bismuth Germanate | $\text{Bi}4\text{Ge}3\text{O}_{12}$ | $7.13$ | $1.12$ | Large-scale general-purpose detectors (e.g., $\text{L3}$ upgrade) |
| Depleted Uranium | $\text{U}_{\text{dep}}$ | $19.1$ | $0.56$ | Hadronic/EM segmentation (due to neutron moderation) |
| [Acrylic Resin (Hyper-Scint)](/entrie… -
Neutron Signal
Linked via "neutron moderation"
$$\text{n} + \text{^{157}Gd} \rightarrow \text{^{158}Gd}^* \rightarrow \text{^{158}Gd} + \gamma_{\text{total}} (\text{typically } 8.5 \text{ MeV})$$
Crucially, the time delay between the initial interaction (e.g., a muon decay or neutrino interaction) and the subsequent capture event is determined by the neutron moderation and diffusion time, which averages between $20 \text{ }\mu\text{s}$ and $30 \text{ }\mu\text{s}$ in water doped …