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Annotation 3936228609292

#physics
it was quickly realized that, if a fission event produced neutrons, each of these neutrons might cause further fission events
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Neutron - Wikipedia
ade after the neutron was discovered by James Chadwick in 1932,[6] neutrons were used to induce many different types of nuclear transmutations. With the discovery of nuclear fission in 1938,[7] <span>it was quickly realized that, if a fission event produced neutrons, each of these neutrons might cause further fission events, etc., in a cascade known as a nuclear chain reaction.[8] These events and findings led to the first self-sustaining nuclear reactor (Chicago Pile-1, 1942) and the first nuclear weapon



Annotation 3936229657868

#physics
Free neutrons, while not directly ionizing atoms, cause ionizing radiation.
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Neutron - Wikipedia
n a cascade known as a nuclear chain reaction.[8] These events and findings led to the first self-sustaining nuclear reactor (Chicago Pile-1, 1942) and the first nuclear weapon (Trinity, 1945). <span>Free neutrons, while not directly ionizing atoms, cause ionizing radiation. As such they can be a biological hazard, depending upon dose.[8] A small natural "neutron background" flux of free neutrons exists on Earth, caused by cosmic ray showers, and by the nat



Annotation 3936230706444

#physics
A free neutron is unstable, decaying to a proton, electron and antineutrino with a mean lifetime of just under 15 minutes ( 7002881500000000000♠ 881.5 ± 1.5 s ).
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Neutron - Wikipedia
s a magnetic moment, however, so the neutron is influenced by magnetic fields. The neutron's magnetic moment has a negative value, because its orientation is opposite to the neutron's spin.[13] <span>A free neutron is unstable, decaying to a proton, electron and antineutrino with a mean lifetime of just under 15 minutes (7002881500000000000♠881.5±1.5 s).[14] This radioactive decay, known as beta decay, is possible because the mass of the neutron is slightly greater than the proton. The free proton is stable. Neutrons or protons bound in