Abstract
The new phenomenon of induced radioactivity discovered by Curie and Joliot presents many points of exceptional interest. It appears that when α-particles collide with aluminium nuclei two different processes may occur. A proton may be ejected Al
13
27
+ He
2
4
→ Si
14
30
+ H
1
1
, leaving a stable isotope of silicon. This is the process which has been investigated in great detail, notably by Chadwick and his collaborators. Alternatively a neutron may be ejected instead of the proton leaving an isotope of phosphorus Al
13
27
+ He
2
4
→ P
15
30
+
n
0
1
. This element, calledradio-phorus by its discoverers, Curie and Joliot, disintegrates with emission of positrons with a period of about 3 minutes P
15
30
→ Si
14
30
+ ε
+
.
Cited by
25 articles.
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