| 41. | Plutonium is fissionable with both fast and thermal neutrons, which make it ideal for either nuclear reactors or nuclear bombs.
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| 42. | It has significant thermal neutron cross section for fission, but is more likely to capture a neutron and become Pu-239.
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| 43. | Natural uranium is 99.284 % nuclide existing in nature ( in any appreciable amount ) that is fissile with thermal neutrons.
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| 44. | A " thermal neutron " is a free neutron that is kinetic theory " for energies and speeds of molecules ).
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| 45. | The excitation energy within the compound nucleus is formed from the binding energy of the thermal neutron with the target nucleus.
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| 46. | Its precursor 235 U and thermal neutrons ) but also has the highest known thermal neutron capture cross section of any nuclide.
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| 47. | Its precursor 235 U and thermal neutrons ) but also has the highest known thermal neutron capture cross section of any nuclide.
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| 48. | And better mine detectors _ using radar, microwaves, lasers or thermal neutron analysis _ won't be available for five to 10 years.
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| 49. | While a nuclear bomb working on thermal neutrons may be impractical, modern weapons designs may still benefit from some level of moderation.
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| 50. | Beside thermal neutrons, a cold moderator of liquid deuterium ( cold source ) slows neutrons down and shifts their spectrum to lower energies.
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