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• W31551877 abstract "The main purpose of the secondary, or hypernuclear, target is the stopping and absorption of the produced Ξ hyperon and the identification of the secondary reaction vertex by tracking of the incident Ξ and charged decay products from the weak decay of the ΛΛ hypernuclei. Even with a moderate spatial resolution, this information will help to reduce the background in the offline analysis significantly. The energy release of about 28MeV during the conversion of the Ξ into two Λ hyperons may give rise to the emission of particles from the secondary target nucleus. As a consequence, a variety of double, single or twin hypernuclei as well as ordinary nuclei may be produced in excited states. In order to simplify the assignment of the various transitions to a specific nucleus four separated sections with up to four different main target materials are foreseen. The initial experiment will concentrate on light target materials like Be, B, C and C. In addition, the interactions in the material of the silicon detector can be studied. At the same time, the light elements help minimizing the absorption of γ-rays emitted by the excited hypernuclei. The geometry of the solid-state micro tracker is mainly determined by the mean life time of the Ξ− of only 0.164 ns. If the separation between the primary target and the secondary absorber is too big,low momentum Ξ− will decay prior to stopping. On the other hand, energetic Ξ− with momenta beyond approximately 500MeV/c cannot be stopped prior to their decay. This limits the thickness of the active secondary target to a few cm (see Fig. 1)." @default.
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• W31551877 date "2005-01-01" @default.
• W31551877 modified "2023-09-26" @default.
• W31551877 title "Hypernuclei at PANDA: Hypernuclear Target" @default.
• W31551877 hasPublicationYear "2005" @default.
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