The yield of a nuclear reaction producing radio nuclides may be described in two ways: either by the ratio w of the number of nuclear reactions to the number of bombarding particles, or by the quantity k, the ratio of the activity of the formed radio nuclide to the number of bombarding particles, Find:
(a) The half-life of the formed radionuclide, assuming w and k to be known:
(b) The yield w of the reaction Li7 (p, n) Be 7 if after irradiation of a lithium target by a beam of protons (over t = 2.0 hours and with beam current I = 10μA) the activity of Be7 became equal to A = 1.35 ∙ 108 dis/s and its half-life to T = 53 days.