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  2. Frisch–Peierls memorandum - Wikipedia

    en.wikipedia.org/wiki/Frisch–Peierls_memorandum

    [39] Using modern values he found that to be "equal to about a microsecond, which makes the point about the rapidity of fission with fact [sic] neutrons". [39] In the original memorandum, if the neutrons had velocities of 10 9 cm/s, then they would have an average time between fission collisions of 2.6 × 10 −9 s. Therefore, Bernstein's time ...

  3. Critical points of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Critical_points_of_the...

    Also agrees with Celsius values from Section 4: Properties of the Elements and Inorganic Compounds, Melting, Boiling, Triple, and Critical Point Temperatures of the Elements Estimated accuracy for T c and P c is indicated by the number of digits.

  4. Critical mass - Wikipedia

    en.wikipedia.org/wiki/Critical_mass

    A critical mass is a mass of fissile material that self-sustains a fission chain reaction. In this case, known as criticality, k = 1. A steady rate of spontaneous fission causes a proportionally steady level of neutron activity. A supercritical mass is a mass which, once fission has started, will proceed at an increasing rate. [1]

  5. Tamper (nuclear weapon) - Wikipedia

    en.wikipedia.org/wiki/Tamper_(nuclear_weapon)

    The tamper had a radius of 17.5 centimetres (6.9 in) and a thickness of 11.3 centimetres (4.4 in), for a mass of 317 kilograms (699 lb). This was about 3.5 times the mass of the fissile material used. Tungsten carbide has a high density and a low neutron absorbency cross section.

  6. Point particle - Wikipedia

    en.wikipedia.org/wiki/Point_particle

    A point particle is an appropriate representation of any object whenever its size, shape, and structure are irrelevant in a given context. For example, from far enough away, any finite-size object will look and behave as a point-like object. Point masses and point charges, discussed below, are two common cases.

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