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The cross section for a 2.0-MeV neutron (a typical energy for a neutron released in ﬁ ssion) being absorbed by a ²³⁸U nucleus and producing ﬁ ssion is 0.68 barn. For a pure 238U sample of thickness 3.2 cm, what is the probability of a 2.0-MeV neutron producing ﬁ ssion? (p = 19 g/cm³ for uranium)

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