1. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 E. Fioretto - LNL1 Status of the magnetic spectrometer PRISMA E. Fioretto INFN – Laboratori Nazionali di Legnaro E. Fioretto INFN – Laboratori Nazionali di Legnaro

2. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 E. Fioretto - LNL2 PRISMA in vacuum mode Target Beam Rotating platform Quadrupole 30 cm 50 cm Dipole 60° 120 cm -20° +130° PRISMA: a large acceptance magnetic spectrometer  80 msr; B  = 1.2 Tm  A/A ~ 1/200 Energy acceptance ±20%

3. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 E. Fioretto - LNL3 PRISMA : the Start detector Quadrupole Dipole Target X Y MCP  t ~ 350 ps,  X,  Y ~ 0.5 mm G. Montagnoli et al. NIM A547, 455 (05)

4. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 E. Fioretto - LNL4 PRISMA : the Focal Plane Detector Quadrupole Dipole Target S. Beghini et al. NIM A551, 364 (05) X position  t ~ 300 ps,  X,  Y = 1 mm MWPPAC

5. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 E. Fioretto - LNL5 PRISMA : the Focal Plane Detector Quadrupole Dipole Target Z=30  E/E < 2% Z/  Z ~ 60 for Z=20 Ionization chamber 70 Zn+ 238 U

6. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 E. Fioretto - LNL6 CLOVER array (up to March 2008) Quadrupole Dipole  23 EUROBALL Clovers  Efficiency ~ 3 % (E  = 1.3 MeV)  FWHM = 0.9% (for  =10%)  Peak/Total ~ 45% CLARA

7. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008  Shell evolution @ N=20/32/34/50/82  Collectivity (deformation) and dynami- cal symmetries  Lifetime measurements  Pairing vibrational states  Molecular resonances  Multinucleon transfer reactions E. Fioretto - LNL7 Main topics of the PRISMA-CLARA campaign Grazing reactions as a tool to study n-rich nuclei

8. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 36 Si E. Fioretto - LNL8 Around the island of inversion 0 0+0+ 1408 2+2+ (4 + ) (6 + ) 2850 3692 PRISMA  =56° 36 S+ 208 Pb @ 215 MeV X. Liang et al., PRC 74, 014311 (2006) rotor vibrator E   (keV) CLARA

9. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 E. Fioretto - LNL9 Exploring the 48 Ca region 48 Ca @ 310MeV nat Mg β≈10.0% β’≈8.0% d DegraderTarget E’E’ EE @  g for BLF 208 Pb Differential Plunger PRISMA CLARA RDDS method 48 Ca+ 238 U @ 310 MeV Mass resolution after degrader is preserved EγEγ Eγ’Eγ’ E  ’ : Doppler corrected

10. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 J.J. Valiente-Dobón et al., LNL Annual Report 2007 and to be published E. Fioretto - LNL10 Exploring the 48 Ca region IuIu IsIs Ca (2 + ) 50 Ca 51 Sc The measured transition probability in 50 Ca is lower than in doubly-magic 48 Ca, in agreement with shell-model calculations (tuned with previous experiments in the mass region) Transition probabilities

11. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 E. Fioretto - LNL11 Spectroscopy of heavy Cr isotopes 64 Ni+ 238 U @ 404 MeV N. Mărginean et al., PLB 633 (2006) 696  rays from the yrast levels of 58 Cr observed for the first time

12. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 58 Cr E. Fioretto - LNL12  -softness in heavy Cr and Fe isotopes 64 Ni+ 238 U @ 404 MeV N. Mărginean et al., PLB 633 (2006) 696  The R(E4/E2) ratio for the heavy Fe isotopes is very close to the 2.50 value characteristic of  -soft rotors (S. Lunardi et al., PRC 76, 034303 (2007))  58 Cr lies exactly at the 2.20 value predicted for the E(5) dynamical symmetry. The energies of the yrast band are in good agreement with the predictions. F.Iachello PRL85, 3580 (2000)

13. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008  Scientific output  24 experiments (Jan 2004 - Mar 2008)  16 papers + 2 submitted  Over 40 presentations at international conferences/workshops  User Access  ~ 50% of the total beam-time of the Tandem/PIAVE-ALPI accelerator complex of INFN-LNL  ~ 200 European users most of them supported within the Transnational Access activity of the EC-contract EURONS  Education  8 thesis (diploma, PhD, …)  Support (research contracts)  8 person-years funded by INFN  5 person-years for Nuclear Structure Based Facilities funded by EC through EURONS (only partly devoted to PRISMA-CLARA) E. Fioretto - LNL13 Summary of the PRISMA-CLARA campaign

14. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 E. Fioretto - LNL14 The AGATA demonstrator at LNL  1 symmetric triple-cluster  5 asymmetric triple-clusters  36-fold segmented crystals  555 digital-channels  Eff. 3 – 7 % @ M  = 1  Eff. 2 – 4 % @ M  = 30  Full DAQ  with on-line PSA and  -ray tracking  In beam Commissioning  First test site: LNL Telescopic beam line Support frame LN 2 line The first subset of AGATA (the Demonstrator Array) will soon start operation at the Laboratori Nazionali di Legnaro. The installation is in progress. 23 LOIs – 16 Institutions CLARA vs. AD PRISMA + AD + Plunger PRISMA + CLARA + Plunger

15. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 E. Fioretto - LNL15 PRISMA in Gas-Filled mode Detector chamber for GFM Magnetic dipole Gas-flow control system The new detector-chamber mounted on PRISMA

16. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 E. Fioretto - LNL16 PRISMA in Gas-Filled mode 58 Ni 112 Sn 148 Sm 176 Hf 208 Pb 252Fm according to Betz Problems with magnetic rigidity PRISMA max rigidity for central trajectories  cross sections are known, so it is an ideal case for validating the simulations  the average charge state can be very low in gas for a slow, heavy ion  for a central trajecto- ry Prisma is limited to A<180  by using non-central trajectory we can reach B  = 1.5 Tm

17. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 Recoil detectors E. Fioretto - LNL17 2 x 3 SSD, 300  m thick, 5x5 cm 2 16 resistive strips Si-strip detectors for PRISMA in GFM

18. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 16 PA – box (1 Si detector) Total of about 100 signals Junction side 3mm ohmic side Recoil detectors and electronics E. Fioretto - LNL18 Home-made PA

19. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 Scattering chamber E. Fioretto - LNL19 beam beam stopper monitor CF window “nose” GSI windows (gas side) LNL windows beam side Conditions of the beam test

20. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 In-beam tests E. Fioretto - LNL20 Elastic scattering reaction below Coulomb barrier 58 Ni+ 197 Au @ 160 MeV, PRISMA @ 55°  the heavy recoils simulate typical ERs without the complications of a 0° measurement  cross sections are known, so it is an ideal case for validating the simulations  it is also possible to measure the position spectrum of the “beam”  Measurements  varying the dipole field, for each pressure centering the “ER” onto the FPD  varying the quadrupole field for best transmission and resolution  different gas pressures (1 mbar and 3 mbar)  tests with different gas would also be of interest

21. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 In-beam tests (June-July 2007) E. Fioretto - LNL21 fwhm ~ 15cm  -calibration X-Energy matrix and position spectrum

22. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 E. Fioretto - LNL22 Summary of performed tests  PRISMA in GFM  Adequate Bρ up to masses A~200  Focal plane detector : 6 Si strips detectors  10 × 15 cm 2  Aim : fusion reactions studies (no SHE)  Tests performed  Electronics tests with Si and α-source  C-foil window leak tested with different gases  In-beam tests 58 Ni (160 MeV)+ 197 Au, PRISMA @ 55° (July ‘07)  Test of spot size  beam separation vs energy and gas  Future step  In beam test @ 0°  to measure a fusion reaction in full operating condition  PRISMA in GFM  Adequate Bρ up to masses A~200  Focal plane detector : 6 Si strips detectors  10 × 15 cm 2  Aim : fusion reactions studies (no SHE)  Tests performed  Electronics tests with Si and α-source  C-foil window leak tested with different gases  In-beam tests 58 Ni (160 MeV)+ 197 Au, PRISMA @ 55° (July ‘07)  Test of spot size  beam separation vs energy and gas  Future step  In beam test @ 0°  to measure a fusion reaction in full operating condition

23. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 E. Fioretto - LNL23 Summary  PRISMA+CLARA  24 experiments (Jan 2004 - Mar 2008)  ~ 200 European users  ~ 50% of the total beam time of the Tandem/PIAVE-ALPI accelera- tor complex  PRISMA+AGATA Demonstrator  The installation of the AGATA Demonstrator around the target area of PRISMA is in progress (EURONS – JRA02-AGATA)  The first experimental campaign for reaction mechanism and nuclear structure studies with PRISMA+AD in 2009  PRISMA in GFM (EURONS – JRA06-INTAG)  Recoil detector and home-made electronics successfully tested with PRISMA not @ 0°  PRISMA+CLARA  24 experiments (Jan 2004 - Mar 2008)  ~ 200 European users  ~ 50% of the total beam time of the Tandem/PIAVE-ALPI accelera- tor complex  PRISMA+AGATA Demonstrator  The installation of the AGATA Demonstrator around the target area of PRISMA is in progress (EURONS – JRA02-AGATA)  The first experimental campaign for reaction mechanism and nuclear structure studies with PRISMA+AD in 2009  PRISMA in GFM (EURONS – JRA06-INTAG)  Recoil detector and home-made electronics successfully tested with PRISMA not @ 0°

24. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008 E. Fioretto - LNL24 AGATA (Advanced GAmma Tracking Array) Highly segmented HPGe detectors · · Reconstruction of tracks Digital electronics Reconstructed  -rays Identification interaction points (x,y,z,E,t) i PSA to decompose recorded waves Ingredients 180 hexagonal crystals 3 shapes 60 triple clusters all equal Inner radius 24 cm Amount of germanium 362 kg Solid angle coverage 82 % 6480 segments Efficiency at 1 MeV: 43% - 28% (M  =1-30) Peak/Total: 58% - 49% (M  =1-30) Innovative use of detectors (PSA,  - ray tracking, digital DAQ) will result in high efficiency and excellent energy resolution, making AGATA the ideal instrument for spectrosco-pic studies of weak channels.

25. Meeting on gas and Si detectors for the PRISMA and VAMOS spectrometers GANIL, October 2nd, 2008  Time of flight → directly involved in calculation of speed, therefore of  mass [mv2/R=qBv → m=qBR/v]  Q-value   -ray energies (Doppler correction)  Entrance and focal-plane space coordinates → used to reconstruct  total distance D covered inside PRISMA (v = D/TOF)  trajectory curvature radius R in dipole magnet  Energy released in IC (each section) → used to select events (Z and q) E. Fioretto - LNL25 Quantities measured with PRISMA x fp R/  A/q RR E IC Charge state E IC Range Atomic number Trajectories reconstructed through iterative procedure depending only on the ratio of fields in dipole and quadrupole and providing trajectory length and curvature radius