1. 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

2. 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 segments 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  GANIL  GSI  2012

3. 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

4. Setup works also as Compton Polarimeter
AGATA Demonstrator Experimental Program
2008  LNL 6TC
2010  GANIL/SPIRAL ≥8TC
2012  GSI / FRS ~15TC
AGATA 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 = b = 0.5
AGATA D. LNL
13.5 cm 6%

5. Schematics of the mounting frame with 15 triple clusters
AGATA Demonstrator – PRISMA PRISMA: large acceptance spectrometer for binary reactions

6. 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

7. 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

8. 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

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

10. 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

11. AGATA Demonstrator cryogenic infrastructures (INFN-LNL and INFN-Padova)
Distribution and collector manifolds of-line tested, installed in the LN2 cryogenic line and commissioned.

12. AGATA Demonstrator cryogenic infrastructures (INFN-LNL and INFN-Padova)
Evacuation line and evaporator for the LN2 overflows: problems solved, all parts mounted and tested.

13. 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

14. 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

15. 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

16. AGATA Demonstrator at PRISMA

17. 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

18. 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

19. 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.

20. 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

21. 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.

22. 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, (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.

23. 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.,

24. Symmetries and shape phase-transitions
134Ba
152Sm
F. Iachello, Phys. Rev. Lett. 85 (00)3580, Phys. Rev. Lett. 87 (01)
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.

25. 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

26. 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)

27. 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

28. 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

29. 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

30. 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!

32. Some expected beams in 2009