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Physics
Problem
Which of the following fusion reactions is expected to require the lowest ignition temperature? a)
1
2
H
+
1
2
H
→
2
3
H
e
+
0
1
n
^2_1\mathrm H + ^2_1\mathrm H \rightarrow ^3_2\mathrm{He} + ^1_0\mathrm n
1
2
H
+
1
2
H
→
2
3
He
+
0
1
n
b)
1
2
H
+
1
3
H
→
2
4
H
e
+
0
1
n
^2_1\mathrm H + ^3_1\mathrm H \rightarrow ^4_2\mathrm{He} + ^1_0\mathrm n
1
2
H
+
1
3
H
→
2
4
He
+
0
1
n
c)
3
6
L
i
+
1
2
H
→
2
2
4
H
e
^6_3\mathrm{Li} + ^2_1\mathrm H \rightarrow 2\,^4_2\mathrm{He}
3
6
Li
+
1
2
H
→
2
2
4
He
d)
2
3
H
e
+
2
3
H
e
→
2
4
H
e
+
2
1
1
p
^3_2\mathrm{He} + ^3_2\mathrm{He} \rightarrow ^4_2\mathrm{He} + 2\,^1_1\mathrm p
2
3
He
+
2
3
He
→
2
4
He
+
2
1
1
p
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