A feasible and fruitful way to study the spectroscopy of hypernuclei has been demonstrated by two experiments that applied counter techniques to measure hypernuclear reactions induced by K mesons in flight. Such studies have been made possible in recent years by the development of intense, low‐momentum K beams. They were further stimulated by the suggestions of theorists that production of hypernuclei by K mesons in flight might favor the formation of states in which a nucleon of the parent nucleus is replaced by a lambda hyperon without otherwise changing the wave functions. Comparison of such a hypernuclear state with the corresponding nuclear state could yield useful information about the lambda–nucleon interaction.

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