3 5) Be (I*=), initially at rest, captures K electrons and decays either to the ground state (I 2 2 or the 0.478 MeV first excited state (I= -) of Li. 2 (i) Sketch the decay scheme. (ii) Estimate the kinetic energy of the neutrino emitted in each case, ignore the kinetic energy of Li. (iii) Identify the permitted multiples for the gamma transition in Li (iv) If the above transition has a conversion coefficient 1.0, use Weisskopf estimates to calculate a theoretical lifetime for the excited state.
3 5) Be (I*=), initially at rest, captures K electrons and decays either to the ground state (I 2 2 or the 0.478 MeV first excited state (I= -) of Li. 2 (i) Sketch the decay scheme. (ii) Estimate the kinetic energy of the neutrino emitted in each case, ignore the kinetic energy of Li. (iii) Identify the permitted multiples for the gamma transition in Li (iv) If the above transition has a conversion coefficient 1.0, use Weisskopf estimates to calculate a theoretical lifetime for the excited state.
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3
5) Be (I*=), initially at rest, captures K electrons and decays either to the ground state (I =
2
2
or the 0.478 MeV first excited state (I 7=
) of Li.
(i) Sketch the decay scheme.
(ii) Estimate the kinetic energy of the neutrino emitted in each case, ignore the kinetic energy of Li.
(iii) Identify the permitted multiples for the gamma transition in Li .
(iv) If the above transition has a conversion coefficient 1.0, use Weisskopf estimates to calculate a
theoretical lifetime for the excited state.
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