Chadwick's Bench
How the
neutron
was found
A working model of Chadwick's 1932 bench · drag to orbit, scroll to zoom
+
−
Detector counts
0
Cut open the chamber
alpha particles
the mystery radiation
nuclei knocked out
What sits in the beam
Lead wall
Bothe & Becker · 1930
Paraffin wax
Joliot-Curies · Jan 1932
Nitrogen gas
Chadwick · Feb 1932
Aluminium foils in the beam
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+
2
foils ≈
16
cm of air
60%
of protons get through
Step 1 of 6
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