perturbed angular correlation spectroscopy

The need of having to go to milli-Kelvin temperatures is a disadvantage of LTNO and NMR/ON. Can we exploit the advantages of a strongly oriented ensemble of nuclei while staying at room temperature (or even above, when heating)? The answer is ‘yes’, and an experimental method doing this is Perturbed Angular Correlation spectroscopy (PAC).

There are two tasks related to this video:

(1) For a PAC experiment in a situation without hyperfine interaction, this is what will be measured in two different detector combinations:

Answer the following questions in the forum :
1-a) Why do you observe an exponential decay ?
1-b) Why is the number of events/counts for detector combination 1-2 smaller than for 1-3 ?

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(2) Describe how the oscillating function would look like in the two limiting cases of a PAC experiment for an extremely small hyperfine interaction and an extremely large hyperfine interaction ? Why would it become impossible to determine the frequency in such an experiment ?

Expected time: 1h00 minutes (report)