N. Redon AW Uppsala July Proposal for a commissioning experiment with the AGATA Demonstrator Proposal for a commissioning experiment with the AGATA Demonstrator 7 th AGATA Week, Uppsala 8-11 July 2008 Q.T. Doan, O. Stézowski, D. Guinet, A. Vancraeyenest, N. Redon IPN Lyon, France An experiment to demonstrate the performance of the tracking - for fusion-evaporation reactions - with high  multiplicity - medium energy  -rays (~1 MeV) An experiment on well known and well populated superdeformed nucleus based on simulations

N. Redon AW Uppsala July population of the SD band in 152 Dy via a nearly mass-symmetric reaction 82 Se + 74 Ge  156 Dy*  152 Dy + 4n v/c ≈ 4.9% SD(2%) ND

N. Redon AW Uppsala July Simulations have been realized to compare the performances of EUROBALL (EB) and the AGATA Demonstrator (AD) (Q.T. Doan presentation, 6 th AGATA Week, November 2007) EB AD

N. Redon AW Uppsala July  photopeak efficiency goes from ~9.5% (EB) to ~4-5% (AD at 140mm) for E  ~ 1 MeV and M  =  reduction of the Doppler broadening

N. Redon AW Uppsala July  statistics with fold ≥ 2 with AD at 140mm  -  coincidences

N. Redon AW Uppsala July 20086

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N. Redon AW Uppsala July Energy (keV) Counts

N. Redon AW Uppsala July Conclusions Simulations predict good performances for the AGATA Demonstrator at 140mm : excellent resolution and P/T Even with lower efficiency, AD gated spectra cleaner than EUROBALL ones We propose a fusion-evaporation test experiment : 74 Ge MeV (v/c ≈ 4.9%) to observe the Superdeformed Band in 152 Dy and check the performances of the AGATA Demonstrator at high  multiplicity We will need 5 Triple Clusters at 140mm

N. Redon AW Uppsala July