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The observation of correlated pairs of mesons associated with high energy stars is suggestive of a strong attractive interaction between pairs of π-mesons. If such an interaction exists, it should appear in a relatively simple manner in the production of pairs of mesons by protons or γ-rays near the energetic threshold. The observation of a marked correlation in energy and angle between the mesons of a pair produced in a single event should lead to quantitative information concerning the meson-meson interaction.
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Brueckner et al. (1952) studied this question.
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