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Proposal for a commissioning experiment with the AGATA Demonstrator

This proposal outlines an experiment at 7th AGATA Week to showcase AGATA Demonstrator's performance in tracking fusion-evaporation reactions with high γ multiplicity. The experiment focuses on a superdeformed nucleus, 152Dy, via simulations, comparing AGATA Demonstrator and EUROBALL efficiencies. The study aims to conduct a fusion-evaporation test experiment using 74Ge and 82Se to observe the Superdeformed Band in 152Dy. Conclusions predict good AGATA Demonstrator performance.

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Proposal for a commissioning experiment with the AGATA Demonstrator

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  1. Proposal for a commissioning experiment with the AGATA Demonstrator 7th 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 2008

  2. SD(2%) • population of the SD band in 152Dy via a nearly • mass-symmetric reaction • 82Se + 74Ge  156Dy* 152Dy + 4n v/c ≈ 4.9% ND N. Redon AW Uppsala July 2008

  3. Simulations have been realized to compare the performances of EUROBALL (EB) and the AGATA Demonstrator (AD) (Q.T. Doan presentation, 6th AGATA Week, November 2007) AD EB N. Redon AW Uppsala July 2008

  4. photopeak efficiency goes from ~9.5% (EB) to ~4-5% (AD at 140mm) for E~ 1 MeV and M = 15-30 • reduction of the Doppler broadening N. Redon AW Uppsala July 2008

  5. statistics with fold ≥ 2 with AD at 140mm - coincidences N. Redon AW Uppsala July 2008

  6. N. Redon AW Uppsala July 2008

  7. N. Redon AW Uppsala July 2008

  8. N. Redon AW Uppsala July 2008

  9. Counts Energy (keV) N. Redon AW Uppsala July 2008

  10. Counts Energy (keV) N. Redon AW Uppsala July 2008

  11. 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 : 74Ge +82Se @ 328 MeV (v/c ≈ 4.9%) to observe the Superdeformed Band in 152Dy and check the performances of the AGATA Demonstrator at high  multiplicity • We will need 5 Triple Clusters at 140mm N. Redon AW Uppsala July 2008

  12. N. Redon AW Uppsala July 2008

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