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Proposal for a commissioning experiment with the

AGATA Demonstrator

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

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• population of the SD band in 152Dy via a nearly mass-symmetric reaction 82Se + 74Ge 156Dy* 152Dy + 4n v/c ≈ 4.9%

SD(2%)

ND

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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)

EB AD

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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

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statistics with fold ≥ 2 with AD at 140mm

- coincidences

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Energy (keV)

Cou

nts

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Energy (keV)

Cou

nts

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ConclusionsConclusions

• 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

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