Performance Studies on Light Nuclei and Hypernuclei Measurements with the TRD in the CBM-Experiment

The Compressed Baryonic Matter (CBM) experiment at the Facility for Antiproton and Ion Research (FAIR) will be dedicated to the exploration of the QCD phase-diagram in the region of high net-baryon densities. A high statistics measurement of double-Λ hypernuclei as a part of the CBM-measurement programm will represent a breakthrough in this field of physics, since up to now only very few double-Λ hypernuclei events have been identified. The Transition Radiation Detector (TRD) will significantly extend the number of hypernuclei states accessible within the CBM physics program. For the identification of _ΛΛ⁶He, which decays as _ΛΛ⁶He → ⁵_ΛHe + p + π^- and subsequently as ⁵_ΛHe → ⁴He + p + π^-, the separation of d und ⁴He is particularly important. The m/Z measurement of hadrons alone, as provided by the Time of Flight Detector (TOF), is not able to distinguish between the two different charge states. The TRD contributes to the separation of charged hadrons with a measurement of the specific energy loss in its four layers of Multi-Wire Proportional Chambers. Simulations demonstrate how a unique identification of d and ⁴He can be performed by combining TOF and TRD information, allowing to identify double-Λ hypernuclei with high efficiency.