The AGATA Demonstrator at LNL:

Status of the installation and

scientific programme.A.Gadea CSIC-IFIC / INFN-LNL

on behalf of E.Farnea (new local responsible)

and the AGATA Collaboration

The AGATA DemonstratorObjective of the final R&D phase 2003-2008

1 symmetric triple-cluster5 asymmetric triple-clusters

15 ×36-fold segmented crystals540 segments

555 high resolution digital-channels

Eff. 3 – 8 % @ Mg = 1

Eff. 2 – 4 % @ Mg = 30

Operate in real time ACQ,Pulse Shape Analysis and

ray Tracking

Hosting sites: LNL 2008 GANIL 2010 GSI 2012

The AGATA Demonstrator performance figures

AGATA radius 23.5 cm

AGATA D. LNL13.5 cm

AGATA radius 23.5 cm

AGATA D. LNL13.5 cm

MC simulations by

E.Farnea

2008 LNL6TC

2010 GANIL/SPIRAL≥8TC

2012 GSI / FRS ~15TC

AGATA D. + PRISMA AGATA D. + VAMOS

AGATA Demonstrator Experimental Program

AGATA D. @ FRS

Eff (%)vs. distance

AGATA radius 23.5 cm

AGATA D. LNL

13.5 cm6%

0

5

10

15

20

25

30

35

40

45

50

1 2

Effi

cie

ncy

(%

)

Solid Angle (%)

Efficiency M = 1

Efficiency M = 10

Efficiency M = 20

Efficiency M = 30

= 0 = 0.5

AGATA D. ≥8TCEXOGAM 8 seg. Clovers

Total Eff. > 10% Setup works also as

Compton Polarimeter

Schematics of the mounting frame with 15

triple clusters

AGATA Demonstrator – PRISMA

PRISMA: large acceptance spectrometer for binary

reactions

Installation of the AGATA Demonstrator at LNL

Currently: Installation of basic infrastructures at LNLJuly: Installation & start commissioning DSSJuly-August: first tests with first AGATA TC

AGATA Demonstrator mechanics: from the AGATA Flange to the full structure.

(Design: STFC Daresbury, Construction: INFN-Padova, Milano, LNL)

Very strict tolerances for construction and mounting.(STFC)

3 mounting attempts and 2 survey expeditions to reach

acceptable tolerances

STFC Laser Tracker

AGATA Demonstrator support frame.

(Design: STFC Daresbury, Construction: INFN-LNL and

Padova,)

Base and Intermediate frames

Flange shell Frame

Flange shell Frame with LN2 Bracket

Mounting the Flange shell in the Frame. (STFC Daresbury, INFN-Padova, Milano, LNL, GANIL)

Flange Shell Mounting Survey Results (STFC Daresbury, INFN-Padova, Milano, LNL, GANIL)

Model with the projection lines to the center

Before mounting the shell in the frame: all points within 0.4 mm

After mounting the shell in the frame: all point within 0.5 mm

Full support structure aligned to reaction chamber and target

position

AGATA Demonstrator cryogenic infrastructures (INFN-LNL and INFN-Padova)

Distribution and collector manifolds

of-line tested, installed in the LN2 cryogenic

line and commissioned.

AGATA Demonstrator cryogenic infrastructures (INFN-LNL and INFN-Padova)

Evacuation line and evaporator for the LN2 overflows:

problems solved, all parts mounted and tested.

DSS, Electronics and DAQ Infrastructures (LNL, Padova, CSNSM, IPNO, IPHC, Saclay, Daresbury, Liverpool, GSI, Jyvaskyla)

75m Optical fibresPre-

processing

PSA and DAQ

DetectorsOn-board DSS &

Digitizers

Infrastructure installation

ongoing

Design Engineer: Rob GriffithsProject Engineer: John Strachan

STFC Daresbury Laboratory

DEMOSTRATOR-PRISMA AXIS

BEAM AXIS

Angular Range For The AGATA DEMONSTRATOR- PRISMA

Setup

Distance target-AGATA ~14cm (efficiency ~6%)

58° to 130° fix 37° and 0°

Distance target-AGATA ~23cm (efficiency ~3%)

38° to 130°fix 21° and 0°

AGATA Demonstrator – PRISMA reaction chamber and beam-line.

(Construction: INFN-Milano, LNL)

Telescopic Beam-line Low absorption

reaction chamber

Ready to host DANTEExpansion Beam-Dump

AGATA Demonstrator at PRISMA

Next in programme for the installation• July

• installation of cooling manifold in the Digitizer racks• final arrangement of optical fibers and cables • test of the DSS Low Voltage power supply prototype• Installation of the security appliances of the setup• test of the DSS Power Supply and Autofill controls• test on-site with the AGATA Digitizers• installation of DAQ will continue• probable arrival of the first TC to LNL

•August-September• test of the detector mounting mechanics (to be programmed)• commissioning DSS

•October• first on-site electronics + DAQ test

AGATA DEMONSTRATIONAGATA DEMONSTRATION

Pulse Shape Analysisto de-convolute the

recorded wavesDAQ PSA - FARM

Highly segmented HPGe detectors

NOVEL PRE-AMPSIdentified

interaction points

(x,y,z,E,t)i

Reconstruction of interaction tracks

(tracking algorithms on interaction points)

DAQ TRACKING-FARM

Synchronized digital electronics

record and process the segment signals

DIGITIZERS +PRE-PROCESSING

On-line reconstruction of -rays

Commissioning Preliminary Plan (next plenary session!)

- Phase 0: commissioning with radioactive sources starting when detectors and electronics are available (even partially).- Phase 1: easy test with tandem beams with no ancillary detectors. Radiative capture or fusion-evaporation reactions with light targets in inverse kinematics.- Phase 2: test with a “simple” ancillary detector with limited number of parameters (DANTE). Coulomb excitation reactions with medium mass beams (A<100) in inverse kinematics.- Phase 3: test with PRISMA with multi-nucleon transfer reactions and at high multiplicity with appropriate ancillaries.

The earliest possibility to run in-beam tests is Dec.2008

neutrons

pro

tons

Neutron drip-line

Proton drip-line

More than 20 LoI:Highly Excited Collective Modes.Proton rich mirror nuclei populated by transfer reactions.Superdeformed states in A~40 proton-rich nuclei.

Evolution of collectivity and Dynamical Symmetries in the rare earthsMix-symmetry statesQuenching of the N=82 shell gap in n-rich nucleiN=50 shell gap: lifetime, and excited statesSpectroscopy and lifetimes in the new region of deformation n-rich A~60, N~40 nucleiLifetimes in the region of the island of inversion

Scientific programme: Grazing reactions transferring several nucleons: evolution of magic numbers and collectivity in n-rich nuclei, but not only...

Order-Chaos transition in Warm rotating nuclei.

Exotic beams

-arrays

PHASE SPACE Spin,

Temperature, Isospin

2

3

1

1 Warm Rotation 2 Giant Resonances

3 Pygmy resonances

Collective modes in the continuumCollective Rotation - Order-to-Chaos Transition CN reactions and Deep-Inelastic collissionsCollective Vibrations- Prompt dipole emission CN reactions- Highly excited/Pygmy states in n-rich nuclei Deep-Inelastic Collisions- Giant Quadrupole Resonance Inelastic Scattering

G. Benzoni, N. Blasi , A. Bracco, S. Brambilla, F. Camera, A. Corsi, F.C.L. Crespi, S. Leoni, B. Million, D. Montanari, O. Wieland, et al.

N=20,N=50 and N=82 Shell GapsN=20: 32Mg Island of inversion (due to residual

interaction)

T. Otsuka et al., PRL 95, 232502 (2005)

GXPF1 interaction

neutrons in g9/2

Contribution of tensor interaction to the monopole

term in N=20, 50 and 82

B(E2): GANIL, RIKEN, REX-

ISOLDE, NSCL

Tensor interaction between Tensor interaction between proton and neutron orbitalsproton and neutron orbitals

C.Petrache, et al., E.Sahin, et al., R.Chapman et al., G. Duchêne et al., F.Azaiez et al., A.Gadea et al.

New magic numbers and shape evolution

J.J.Valiente-Dobón et al., D.Mengoni et al., S.M.Lenzi et al., A. Görgen et al.,A.D.M.Cullen et al.,

f7/

2

f7/2p3/2 32

40

p1/2f5/2

g9/2

Shell evolution produces new magic numbers and regions of deformation:

N=32 shell closure for Z~20, N40 Z<28 transitional and deformation

Shape evolution in nuclei Z>28 with 40<N<50

Symmetries and shape phase-transitions

F. Iachello, Phys. Rev. Lett. 85 (00)3580,

Phys. Rev. Lett. 87 (01) 052502

134Ba 152Sm

O. Möller et al., N. Pietralla etal., D.Tonev et al., J.Nyberg et al., J.J.Valiente-Dobón et al.

Critical point symmetries in neutron-rich nuclei.

Evolution of symmetries/shapes with angular momentum.

Shape stability for axial rotors. Mixed-symmetry states.

pro

tons

neutrons

High-spin and exotic shapes

A. Maj, P. Napiórkowski, F. Azaiez et al., J. Ollier, N. Pietralla et al., J.Simpson et al., J. F. Smith et al., A. Görgen et al.,

•Highly collective rotational structures (equivalent to SD) in light nuclei populated by coulex.

•Exotic deformations in actinide nuclei.

•Quadrupole measurements / Shape identification

Superdeformation Hyperdeformation in n-rich nuclei. Interplay between singe-particle and collective degrees of freedom.

•Quadrupole – octupole collectivity

IC Range [a.u.]IC

Ene

rgy

[a.u

.] Z

A/q

v [a.u.]

IC E

nerg

y [a

.u.]

q

TRUE RECOIL VELOCITY+ TRAJECTORY IN DIPOLE+ TOTAL ENERGY

MCP-MWPPAC TOF=0.5 ns

5‰ Energy resolution

Tracking on PRISMA

v/cTARGET

LIKE

BEAM LIKE

DIPOLE

MCP Start Detector

IONIZATION CHAMBER

MWPPAC

A

S.Beghini et al. NIM A551, 364 (05) G.Montagnoli et al. NIM A547, 455 (05)

true recoil velocity

trajectory in dipole

AGATA Demonstrator at PRISMA

Efficiency at 1MeV: ~6% at 14cm Peak/Total: ~50% Angles covered: from ~135o to 180o FWHM, ~10%, 1MeV: <4 keV

FWHMCLARA ~7 keVAD 24 ~2.6 keVAD 14 ~3.3 keV

v/c distribution

~ 8.9%

E= 1 MeV

Simulation with full PRISMA reconstruction

by E.Farnea

Differential RDDS Measurement in the 48Ca

region with CLARAD.Mengoni, J.Valiente,

A.Gadea, A.Dewald

Differential Plunger for angles ≠ 0o

v'v

48Ca 310MeV +

208Pb (1mg)Degrader 4mg

Mg

Comparison between the Diff.plunger lifetime experiment performed with CLARA and with the AGATA D.

48Ca 310MeV + 208Pb

d=2200m

d=1240m

d=300m

Complete CLARA-PRISMA

M-C simulation by D.Mengoni

Plunger – AGATA 14cm

FWHM ~ 6 keV

FWHM ~ 3.5 keV

After DegraderBefore

Degrader

T1/2 ~100ps

Outlook:

•LNL is doing a consistent effort to have the acceleration complex upgraded for the arrival of the AGATA Demonstrator (AD). A new ECR source is presently being installed .•The basic infrastructures for AD will be completed by summer 2008 and, the first tests with an AGATA TC are expected between summer and October.•For the physics campaign, following the Demonstration, the AD will provide experimental capabilities beyond CLARA.•Installation only possible with all the AGATA collaboration working groups, THANK YOU!

Some expected beams in 2009

Ion mass charge m/q E M (Mev/A) I targ (pnA)

Ar 40 9 4,44 13,3 60Zn 70 13 5,38 9,6 46Kr 86 17 5,06 10,1 17Sn 124 20 6,20 8,1 10Xe 136 26 5,23 9,9 19Au 197 28 7,04 6,6 21Pb 208 30 6,93 6,7 3,3