Simulations of the AGATA Response to Relativistic Heavy Ions Beams Pavel Detistov University of Sofia “St Kliment Ohridski” 24.06.2009

σatomic interactions ~ 10000 times σnuclear The Problem Passage of charged ions through matter involves interaction with material’s atomic shells. σatomic interactions ~ 10000 times σnuclear The main processes are defined as: Radiative Electron Capture (REC) – K and L shells are considered Primary Bremsstrahlung Secondary Bremsstrahlung 24.06.2009

Simulation model is based on GEANT4 toolkit Solution Simulation model is based on GEANT4 toolkit Creation of new process classes in order to represent different processes: G4ionRadioactiveElectronCaptureK (& L) G4ionPrimaryBremsstrahlung SecondaryBremsstrahlung 24.06.2009

WHAT IS AGATA? High efficiency 4π detector array Advanced GAmma-ray Tracking Array High efficiency 4π detector array 180 detectors grouped in 60 equal triple clusters 24.06.2009

RISING @ GSI Array of ex-EUROBALL cluster detectors Three campaigns: Fast Beam Campaign Stopped Beam Campaign gRising Campaign 24.06.2009

Stopped beam campaign Rising Stopped beam Agata Stopped beam 535 keV (7-) ( 4+) ( 2+) 0+ 280 μs 202Pt 202Pt 535 keV 719 keV (7-) ( 4+) ( 2+) 0+ 280 μs 24.06.2009

Rising for 202Pt 24.06.2009

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Fast Beam campaign Rising Fast Beam Campaign Agata Fast beam configuration 1 Agata Fast beam configuration 2 24.06.2009

Spectra for 37Ca experiment 37Ca @ 9Be with 195.7 AMeV 700 mg/cm2 Be Target 36Ca: 21+ → 0g.s.+ with E = 3015 keV 24.06.2009 Data are taken from P.Doornenbal’s thesis @ GSI

AGATA benefits from its higher efficiency compared to RISING array Conclusions AGATA benefits from its higher efficiency compared to RISING array Due to the high multiplicity (~103)of the background tracking algorithms should be able to deal with that! 24.06.2009

Thank you for your attention! 24.06.2009