부산대학교 도서관

We give an overview of the old and new topic, “charge symmetry”, a basic concept in nuclear physics. Old data implied that this symmetry might be broken largely for Λ hypernuclei. The state-of-the-art experimental techniques we developed, the decay π spectroscopy of electro-produced hypernuclei and the γ-ray spectroscopy of hypernuclei with a Ge detector array, have established the existence of a large charge symmetry breaking in 4ΛH and 4ΛHe hypernuclei.