Within the context of the Goldhaber Experiment. If a polarised photon of helicity $\pm 1$, is used to excite a $^{152}Sm$ Samarium nucleus to an excited state $^{152}Sm^*$, that then, by spontaneous emission radiates a photon once again, how do we know, that its helicity is equal to the helicity of the photon from before ?
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