192
6 Appendices
(continued)
Nuclide
(MeV)
Nuclide
(MeV)
E Barrier (MeV)
19
9 F
−1.487
231
91 Pa
33.425
20
9 F
−0.017
232
91 Pa
35.941
4.97
20
10 Ne
−7.042
233
92 U
36.921
4.79
22
10 Ne
−8.024
235
92 U
40.921
4.87
26
10 Ne
0.48
236
92 U
42.447
5.03
25
12 Mg
−13.192
238
92 U
47.310
5.63
27
12 Mg
−14.586
239
92 U
50.575
6.21
27
13 Al
−17.196
237
93 Np
44.874
4.94
30
15 P
−20.200
239
93 Np
49.313
5.57
31
15 P
−24.441
239
94 Pu
48.591
5.74
35
16 S
−28.846
240
94 Pu
50.128
5.98
56
26 Fe
−60.606
241
95 Am
52.937
6.34
242
95 Am
55.471
6.72
252
99 Es
77.29
6.79
6.2 Appendix B: Densities, Cross-Sections, Secondary
Neutron Numbers, and Spontaneous-Fission Half-Lives
6.2.1 Thermal Neutrons (0.0253 eV)
Quantity
Unit
235 U
238 U
239 Pu
240 Pu
ρ
g cm −3
18.71
18.95
15.6
15.6
A
g mol −1
235.04
238.05
239.05
240.05
σ capture
bn
98.81
2.717
270.3
289.4
σ fission
bn
584.4
0
747.4
0.059
σ elastic
bn
15.04
9.360
7.968
1.642
σ inelastic
bn
0
0
0
0
ν
–
2.421
2.448
2.872
~3
6 Appendices
(continued)
Nuclide
(MeV)
Nuclide
(MeV)
E Barrier (MeV)
19
9 F
−1.487
231
91 Pa
33.425
20
9 F
−0.017
232
91 Pa
35.941
4.97
20
10 Ne
−7.042
233
92 U
36.921
4.79
22
10 Ne
−8.024
235
92 U
40.921
4.87
26
10 Ne
0.48
236
92 U
42.447
5.03
25
12 Mg
−13.192
238
92 U
47.310
5.63
27
12 Mg
−14.586
239
92 U
50.575
6.21
27
13 Al
−17.196
237
93 Np
44.874
4.94
30
15 P
−20.200
239
93 Np
49.313
5.57
31
15 P
−24.441
239
94 Pu
48.591
5.74
35
16 S
−28.846
240
94 Pu
50.128
5.98
56
26 Fe
−60.606
241
95 Am
52.937
6.34
242
95 Am
55.471
6.72
252
99 Es
77.29
6.79
6.2 Appendix B: Densities, Cross-Sections, Secondary
Neutron Numbers, and Spontaneous-Fission Half-Lives
6.2.1 Thermal Neutrons (0.0253 eV)
Quantity
Unit
235 U
238 U
239 Pu
240 Pu
ρ
g cm −3
18.71
18.95
15.6
15.6
A
g mol −1
235.04
238.05
239.05
240.05
σ capture
bn
98.81
2.717
270.3
289.4
σ fission
bn
584.4
0
747.4
0.059
σ elastic
bn
15.04
9.360
7.968
1.642
σ inelastic
bn
0
0
0
0
ν
–
2.421
2.448
2.872
~3