86 MeV (iv)
(13 14)
For the fourth reaction to occur, the first three reactions must occur
twice, in which case two light helium nuclei unite to form ordinary helium
nucleus If we consider the combination 2(i) + 2(ii) + 2(iii) +(iv), the net
effect is
1
4
1
2
4 H
2
He
2
6
26 7 MeV
e
ν
γ
−
+
→
+
+
+
or 
1
4
1
2
(4 H
4
)
( He
2
)
2
6
26