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The study of nuclear isotopes with strangeness is a wide area of research, encompassing hadronic interaction theories, stellar models and hypernuclear structure. Although fixed target experiments represent the main technology to produce hypernuclei, heavy ion collisions have been shown to be a fruitful alternative when considering light isotopes, particularly due to the capability of creating antimatter partners. This book contains results of investigations on the existence of the hypernucleus composed by one Lambda and two Neutrons (Lnn). The study of this particular state have raised special interest in the community in view of a current dilemma between theoreticians, who argue that the existence of such an isotope is inconsistent with the current understanding of hadronic interactions, and experimental results as the ones presented by the author, which indicates the existence of the Lnn with a significance greater than 4.

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