Bochum 2009 – wissenschaftliches Programm
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HK: Fachverband Hadronen und Kerne
HK 35: Hadron Structure and Spectroscopy II
HK 35.8: Vortrag
Dienstag, 17. März 2009, 18:45–19:00, H-ZO 30
Gamma Spectroscopy of Double Hypernuclei at PANDA — •Alicia Sanchez Lorente — Johannes Gutenberg-Universität Mainz, Institut für Kernphysik, D-55099 Germany
In the PANDA experiment at FAIR, bound states of Ξ hypernuclei will be used as a gateway to form double Λ hypernuclei. At PANDA the reactions p+p → Ξ− Ξ+ and p+n → Ξ− Ξ0 followed by re-scattering of the Ξ− within the primary target nucleus will be employed to produce low momentum cascade hyperons. After stopping the Ξ− in an external secondary target, the formed Ξ hypernuclei will be converted into double Λ hypernuclei.
For light nuclei even a relatively small excitation energy may be comparable with their binding energy. Thus we assume that the principal mechanism of de-excitation is the explosive decay of the excited nucleus into several smaller clusters. To describe this break-up process we have developed a model which is similar to the famous Fermi model for particle production in nuclear reactions. According to these calculations excited states in double and single hypernuclei are produced with significant probability. In this context, γ-ray spectra have been predicted for the planned PANDA experiment. We will present details of the simulation, the identification procedure of double hypernuclei and the suppression of background. A devoted experimental setup for this physics challenge consisting in a specific target system and a γ-detector will be introduced as well.