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 Demonstrator Objective of the final R&D phase 2003-2008 1 symmetric triple-cluster 5 asymmetric triple-clusters 15 ×36-fold segmented crystals 540 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 g-ray Tracking Hosting sites: LNL  2008 GANIL  2010 GSI  2012

The AGATA Demonstrator performance figures MC simulations by E.Farnea b > 0 AGATA D. LNL 13.5 cm AGATA D. LNL 13.5 cm AGATA radius 23.5 cm AGATA radius 23.5 cm b = 0

Setup works also as Compton Polarimeter AGATA Demonstrator Experimental Program 2008  LNL 6TC 2010  GANIL/SPIRAL ≥8TC 2012  GSI / FRS ~15TC AGATA D. @ FRS AGATA D. + PRISMA AGATA D. + VAMOS AGATA D. ≥8TC EXOGAM 8 seg. Clovers Total Eff. > 10% Setup works also as Compton Polarimeter Eff (%) vs. distance AGATA radius 23.5 cm b = 0 b = 0.5 AGATA D. LNL 13.5 cm 6%

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 LNL July: Installation & start commissioning DSS July-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) 3 mounting attempts and 2 survey expeditions to reach acceptable tolerances Very strict tolerances for construction and mounting. (STFC) STFC Laser Tracker

Base and Intermediate frames AGATA Demonstrator support frame. (Design: STFC Daresbury, Construction: INFN-LNL and Padova,) Flange shell Frame with LN2 Bracket Flange shell Frame

Mounting the Flange shell in the Frame 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) Before mounting the shell in the frame: all points within 0.4 mm Model with the projection lines to the center 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.

On-board DSS & Digitizers Infrastructure installation ongoing DSS, Electronics and DAQ Infrastructures (LNL, Padova, CSNSM, IPNO, IPHC, Saclay, Daresbury, Liverpool, GSI, Jyvaskyla) On-board DSS & Digitizers Detectors Infrastructure installation ongoing Pre-processing PSA and DAQ 75m Optical fibres

Angular Range For The AGATA DEMONSTRATOR- PRISMA Setup BEAM AXIS Angular Range For The AGATA DEMONSTRATOR- PRISMA Setup q 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° DEMOSTRATOR-PRISMA AXIS Design Engineer: Rob Griffiths Project Engineer: John Strachan STFC Daresbury Laboratory

Low g- absorption reaction chamber AGATA Demonstrator – PRISMA reaction chamber and beam-line. (Construction: INFN-Milano, LNL) Low g- absorption reaction chamber Telescopic Beam-line Expansion Beam-Dump Ready to host DANTE

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 DEMONSTRATION g · (x,y,z,E,t)i On-line reconstruction of g-rays Highly segmented HPGe detectors NOVEL PRE-AMPS Identified interaction points Reconstruction of interaction tracks (tracking algorithms on interaction points) DAQ TRACKING-FARM (x,y,z,E,t)i · g Pulse Shape Analysis to de-convolute the recorded waves DAQ PSA - FARM Synchronized digital electronics record and process the segment signals DIGITIZERS + PRE-PROCESSING On-line reconstruction of g-rays

Commissioning Preliminary Plan (next plenary session!) The earliest possibility to run in-beam tests is Dec.2008 - 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.

Scientific programme: Grazing reactions transferring several nucleons: evolution of magic numbers and collectivity in n-rich nuclei, but not only... 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. Neutron drip-line Order-Chaos transition in Warm rotating nuclei. protons Evolution of collectivity and Dynamical Symmetries in the rare earths Mix-symmetry states Quenching of the N=82 shell gap in n-rich nuclei N=50 shell gap: lifetime, and excited states Spectroscopy and lifetimes in the new region of deformation n-rich A~60, N~40 nuclei Lifetimes in the region of the island of inversion neutrons

Collective modes in the continuum PHASE SPACE Spin, Temperature, Isospin Collective Rotation - Order-to-Chaos Transition CN reactions and Deep-Inelastic collissions Collective Vibrations - Prompt dipole emission CN reactions - Highly excited/Pygmy states in n-rich nuclei Deep-Inelastic Collisions - Giant Quadrupole Resonance Inelastic Scattering 2 1 Warm Rotation 2 Giant Resonances 3 Pygmy resonances 3 Exotic beams g-arrays 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 Gaps Tensor interaction between proton and neutron orbitals N=20: 32Mg Island of inversion (due to residual interaction) B(E2): GANIL, RIKEN, REX-ISOLDE, NSCL 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 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 pf7/2 nf7/2 np3/2 32 40 p1/2f5/2 g9/2 Shell evolution produces new magic numbers and regions of deformation: N=32 shell closure for Z~20, N40 Z<28 transitional and deformation Shape evolution in nuclei Z>28 with 40<N<50 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.,

Symmetries and shape phase-transitions 134Ba 152Sm F. Iachello, Phys. Rev. Lett. 85 (00)3580, Phys. Rev. Lett. 87 (01) 052502 Critical point symmetries in neutron-rich nuclei. Evolution of symmetries/shapes with angular momentum. Shape stability for axial rotors. Mixed-symmetry states. O. Möller et al., N. Pietralla etal., D.Tonev et al., J.Nyberg et al., J.J.Valiente-Dobón et al.

High-spin and exotic shapes Exotic deformations in actinide nuclei. Highly collective rotational structures (equivalent to SD) in light nuclei populated by coulex. Superdeformation Hyperdeformation in n-rich nuclei. Interplay between singe-particle and collective degrees of freedom. protons Quadrupole – octupole collectivity Quadrupole measurements / Shape identification 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., neutrons

q Z A/q A Tracking on PRISMA IC Energy [a.u.] rv [a.u.] TRUE RECOIL VELOCITY+ TRAJECTORY IN DIPOLE+ TOTAL ENERGY Tracking on PRISMA v/c BEAM LIKE true recoil velocity TARGET LIKE A/q trajectory in dipole DIPOLE MWPPAC IONIZATION CHAMBER 5‰ Energy resolution IC Range [a.u.] IC Energy [a.u.] Z MCP Start Detector A MCP-MWPPAC DTOF=0.5 ns S.Beghini et al. NIM A551, 364 (05) G.Montagnoli et al. NIM A547, 455 (05)

AGATA Demonstrator at PRISMA Efficiency at 1MeV: ~6% at 14cm Peak/Total: ~50% Angles covered: from ~135o to 180o FWHM, b~10%, 1MeV: <4 keV Simulation with full PRISMA reconstruction by E.Farnea FWHM CLARA ~7 keV AD 24 ~2.6 keV AD 14 ~3.3 keV v/c distribution b ~ 8.9% Eg = 1 MeV

Differential RDDS Measurement in the 48Ca region with CLARA D.Mengoni, J.Valiente, A.Gadea, A.Dewald Differential Plunger for angles ≠ 0o 48Ca 310MeV + 208Pb (1mg) Degrader 4mg Mg

Complete CLARA-PRISMA M-C simulation by D.Mengoni Comparison between the Diff.plunger lifetime experiment performed with CLARA and with the AGATA D. Plunger – AGATA 14cm After Degrader Before Degrader 48Ca 310MeV + 208Pb d=2200mm FWHM ~ 6 keV FWHM ~ 3.5 keV Complete CLARA-PRISMA M-C simulation by D.Mengoni d=1240mm T1/2 ~100ps d=300mm

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