18. What is the minimum height to which a gamma quanta source
displacement of the Mössbauer line to exceed the line width itself,
when registered on the Earth's surface? The registered gamma quanta
are known to have an energy ε =93 keV and appear on transition of
ZnⓇ7 nuclei to the ground state, and the mean lifetime of the excited
state is t = 14 us.
Answers
Answer:
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Explanation:
Mössbauer spectroscopy is based on the Mössbauer effect discovered by Rudolf Mössbauer (Mössbauer 1958a, b). The discovery was honored by the Nobel Prize in 1961.
The Mössbauer effect is the nuclear resonance fluorescence 1 of γ rays. In the case of a nuclear transition, the de-excited nucleus is normally recoiled by the momentum of the γ photon emitted, which makes the resonance fluorescence impossible. In solids, however, recoilless photons can be emitted (and re-absorbed by another ground-state nucleus of the same type) with some probability. The Mössbauer effect (recoilless resonant emission and absorption of γ photons (see FIGURE 1) serves as a basis for Mössbauer spectroscopy.
Open image in new windowFIGURE 1
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