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Network for Active Targets

12 institutions (France, Spain, UK, Germany, Poland)

GANIL, FranceCENBG Bordeaux, FranceSPhN/DAPNIA/DSM Saclay, FranceIPN Orsay, FranceSubatech Nantes, FranceUniversity Santiago de Compostela SpainUniversity Liverpool UKDaresbury Laboratory, CCLRC, UKUniversity of York, UK University of Birmingham, UKGSI Darmstadt GermanyKrakow, Poland

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A short word of history:

R&D within FP6 Eurons JRA-01 ACTAR: Definition of best options for the realisation of active target detector concepts for exotic nuclei studies

Future:CONSTRUCTION of detectorS…..

Broad physics program:— two proton radioactivity— resonant elastic scattering— reactions of nuclear astrophysics interest— direct reactions at low energy (SPIRAL/SPIRAL2): inelastic scatteringtransfer rections, charge exchange reactions— studies of cluster states….— elastic scattering at high energy (GSI/FAIR)

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Several detectors will be constructed : different geometries (cubic, cylindrical)Different sizes (low energy/high energy), magnetic field or not…

The detector tanks may be different but many common pointsNeed for coordination, common effort, repartition of tasks:

— theoretical support: IPN Orsay— Simulation package: Santiago de Compostela, GANIL, Nantes— Ray tracing algorithms: CENBG Bordeaux, GANIL— Gas handling system: GANIL— Read out chamber: CENBG, IPN Orsay, Saclay— Electronics: Saclay, Liverpool, Daresbury— Control&Command, Acquisition system: GANIL…

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COLLABORATION

— common meetings: progress reports on different activities,definition of priorities, definition of test procedures at thedifferent stages of material delivery…, —organization of workshops (annual basis) on physics

and technical issues— common Letters of Intent: LoI SPIRAL2, R3B— application for funds in the different countries— contacts with other equipments addressing the samephysics case: EXL at GSI/FAIR, MUST2/GASPARD atGANIL/SPIRAL2

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Recommendation of the SPIRAL2 SAC:

Ex = 0, g.s.Ex = 1.5 MeVEx = 3 MeV

Einc= 8.5 A.MeVD2 at 1atmXreac= 5 cmB=2 T

Active target detector :— innovative concept with high potential.— Proof of principle well established withMAYA and Bordeaux TPC for differentphysics programs.— Next generation of detector necessary to overcome present limitations—  « Niche » of experiments at differentfacilities (Resonance State in 7H,M. Caamano et al, PRL 99(2007)062502First direct observation of two protons in the decay of 45Fe with a time projection chamberJ. Giovinazzo et al, PRL 99(2007) 102501)