Fig. 1.
Fig. 2.
Fig. 3.
Fig. 4.
Fig. 5.
Selected interactions of fast neutrons in Si sensor and conversion layer with their Q values and total energy of recoils for interacting neutrons with kinetic energy of 3_55 MeV and 15_7 MeV with parameters for elastic scattering on hydrogen in the converter layer
| Interaction | Q value (MeV) | Total kinetic energy of charged recoils (MeV) | |
|---|---|---|---|
| @ 3.55 MeV neutrons | @ 15.7 MeV neutrons | ||
| 28Si(n,n′)28Si (elastic sc.) | 0 | up to 0.47 | up to 2.09 |
| 28Si(n,n′)28Si* | −1.779 | 1.771 | 13.921 |
| 28Si(n,α)25Mg | −2.654 | 0.896 | 13.046 |
| 28Si(n,α)25Mg* | −3.239 | 0.311 | 12.461 |
| 28Si(n,α)25Mg** | −3.628 | − | 12.072 |
| 28Si(n,α)25Mg*** | −4.266 | − | 11.434 |
| 28Si(n,α)25Mg**** | −4.618 | − | 11.082 |
| 28Si(n,α)25Mg***** | −5.455 | − | 10.245 |
| 28Si(n,α)25Mg****** | −6.059 | − | 9.641 |
| 28Si(n,p)28Al | −3.860 | − | 11.840 |
| 28Si(n,d)27Al | −9.360 | − | 6.340 |
| 28Si(n,γ)29Si | 8.474 | 12.024 | 24.174 |
| H(n,p)n | 0 | up to 3.55 | up to 15.7 |
Projected ranges of protons in converter layers applied on the sensor surface according to SRIM [21]
| Proton energy (MeV) | Kapton polyimide film C22H10N2O5 (1.42 g/cm3, 10 μm) | Polyethylene (C2H4)n (0.93 g/cm3, 50–150 μm) |
|---|---|---|
| Projected range (μm) | ||
| 3.55 | 152.24 | 190 |
| 15.70 | 2090 | 2700 |