148
C. H. Pyeon
10
-3
10
-2
10
-1
10
0
10
1
10
2
10
-5
10
-4
10
-3
10
-2
10
-1
10
0
Energy [MeV]
Flux [Arbitrary units]
Spallation neutrons
Injected protons
Fig. 5.15 Numerical results (PHITS3.0 [24]) of spectra of injected proton beams and spallation
neutrons generated by injection of protons onto Pb–Bi target (Ref. [22])
3 mm
1 mm
10 mm
50 mm
10 mm
50 mm
50 mm
3 mm
48 mm
80 mm
100 mm
3 mm
Enlarged (downstream of flange)
Proton beams
Al foil
(10*10*1 mm)
Bi foil (10 mm diam.
& 2 mm thick) or
In foil (10*10*1 mm)
Pb-Bi target
(50 mm diam. &
18 mm thick)
Fig. 5.16 Foil settings at stainless steel flange (Ref. [22])