1. The DESIR low energy beam facility at SPIRAL2 DESRI Decay, Excitation and Storage of Radioactive Ions http://www.cenbg.in2p3.fr/desir B. Blank, CENBG LEA workshop, Catania, 13-15 october 2008 Collaboration promoting ISOL beams at SPIRAL2 B. Blank Spokes-person: B. Blank, Bordeaux; blank@cenbg.in2p3.fr J.-C. Thomas, GANIL liaison: J.-C. Thomas, Caen; thomasjc@ganil.fr  DESIR @ SPIRAL2  Beam preparation  The DESIR Facility  Selected physics cases  Cost estimates / Synergies / Milestones

2.  Different production modes considered n-induced fission -> neutron-rich nuclei fusion reaction -> (super)heavy, n-deficient nuclei (+ refractory elements) fragment products at low-energy -> light exotic nuclei  Large variety and high degree of purity for exotic beams all kind of ionization sources (including laser ionization) high-efficiency RFQ cooler/buncher + high-resolution mass separator Why a low energy beam facility at SPIRAL2 ?

3. DESIR physics program  Decay spectroscopy - decay properties and nuclear structure studies - particle-particle correlations, cluster emission, GT strength - exotic shapes, halo nuclei  Laser spectroscopy - static properties of nuclei in their ground and isomeric states - nuclear structure and deformation  Fundamental interactions - CVC hypothesis, CKM matrix unitarity via 0 +  0 + transitions - exotic interactions (scalar and tensor currents) - CP (or T) violation with e.g. Radium  Solid state physics and other applications

4. SPIRAL2 layout GANIL/ SPIRAL S3S3 DESIR Level -1 LINAG NFSNFS 15 m Production building Fragmentation + ISOL 95 A.MeV 36 Ar 3 kW n-induced 238 U fission 40 MeV 5 mA deuterons 10 14 fissions/s Fusion reaction 14 A.MeV A/Q=3 HI, 1 mA SRISRI

5. 8m 12m HRS RFQ storage and maintenance Legend: Electronics Quadrupole Sextupole Multipole Dipole RFQ and HRS cave in the production building Production building SHIRaC

6. SHIRaC SPIRAL2 High Intensity Radiofrequency Cooler Prototype RFQ linear Paul trap, work initiated at CSNSM Orsay (D. Lunney) Under development at LPC Caen (G. Ban, F. Duval) Goals: High-voltage (20 kV), high frequency (20 MHz) linear radio- frequency quadrupole trap for strong confinement of  A beams; should deliver beams with 1 .mm.mrad emittance Results so far: Prototype tested at high-current separator SIDONIE (Orsay) O. Gianfrancesco et al., Proc. EMIS2007

7. High resolusion mass separator  symmetric design, inspired by the CARIBU HRS at ANL: with two magnetic dipoles (D) six quadrupoles (Q) two sextupoles (H) one multipole (M) combined as QQHQD M DQHQQ  minimized aberrations, large mass dispersion  expected performances : M/  M ~ 2.10 4 for a 1 .mm.mrad at 10 to 60 keV Beam profile in x-direction Suggested layout T. Kurtukian-Nieto, CENBG

8. DESIR layout – level 0 Laser room (mezzanine) DAQ room Control room MLL trap Collinear Laser spectroscopy  -NMR RFQ bun- cher off-line source 1 off-line source 2 Penning trap + Decay setup LPC trap Beam from SPIRAL1 Beam from S 3 Beam from Production building General purpose Electronics Desk Access 5 m Level -1 Level 0 TAS Neutron ditch Level -1 Crane access to basement Double MOT General purpose IS Identification station with tape LN2 Gas & waste storage LUMIERE BESTIOL

9. Supply Electri- city Gray Room 2 Gray Room 1 Assembly Room 3 Control Racks Interfaces HV supplies Crane access to basement Stor- age 1 Assembly Room 2 Assembly Room 1 Stor- age 2 Radio lab 5 m storage Neutron ditch DESIR layout - Level -1 Limits DESIR hall free Beam from SPIRAL1 Beam from Production building Work shop Beam from S3 X

10. Refractory elements For ISOL-type studies

11. Collinear Laser spectroscopy: - spins - magnetic moments - quadrupole moments - change of charge radii  -NMR spectroscopy: - nuclear gyromagnetic factor - quadrupole moment N=50, N=64, N=82, … Microwave double resonance in a Paul trap: - hyperfine anomaly and higher order momenta (octupole and hexadecapole deformation) Eu, Cs, Au, Rn, Fr, Ra, Am …. LUMIERE Laser tilisation for Measurement and Laser Utilisation for Measurement and Ionization of Exotic Radioactive Elements F. Le Blanc,Orsay G. Neyens, Leuven P. Campbell, Manchester

12. Decay studies with halo nuclei Clustering studies in light nuclei  -delayed charged-particle emission: e.g. proton-proton correlation Super-allowed  decays and the standard model of electro-weak interaction Deformation and Gamow-Teller distribution 2n correlations, P n and nuclear structure (r-process)... BESTIOL BESTIOL BEta decay STudies at the SPIRAL2 IsOL facility TETRA, Y. Penionzhkevich (Dubna) TAS, B. Rubio (Valencia)  setup, B. Blank (Bordeaux) M.J.G. Borge, Madrid B. Blank, Bordeaux

13. MLLTRAP High-accuracy mass measurements - unitarity of CKM matrix (V ud ): 50 Mn, 54 Co with  M/M~10 -10 - transuranium isotopes (beams from S 3 ): M(Z>102) In-trap spectroscopy: - conversion electron and  spectroscopy: shape coexistence Trap-assisted spectroscopy -  decay studies of isomerically pure radioactive species P. Thirolf, Munich Set-up being installed at MLL/Garching

14. KVI atomic trapping facility: MOT New limits on scalar and tensor contributions in the weak interaction New limits on time-reversal violation in beta decay Systematic of atomic parity non-conservation in a long isotopic chain H. Wilschut, Groningen Experimental set-up at KVI  detector MC P -V 0 +V 0 0

15. within the SM x : Fermi fraction;  : GT/F mixing ratio beyond the SM  contains quadratic S and T contributions  angular correlation requires to measure the recoil ion +  particle Search for exotic interactions O. Naviliat-Cuncic et al., LPC Caen e+e+ e nucleus 

16.  V ud 0+0+ = 0.97418(26) V us K = 0.2254(21) V ub B = 0.00367(47)  = 3071.4 (8) s CVC, CKM, exotic currents: 0+  0+  decays Measurements: - Q value - T 1/2 - branching ratios 1.0000(11)

17.  -NMR spectroscopy  -asymmetry in the decay of polarized nuclei in a magnetic field  Zeeman splitting related to g I and Q S I M +I M -I  resonant destruction of the polarization (i.e.  -asymmetry) by means of an additional RF magnetic field withand B0B0   g I /g I ~ 10 -3,  Q S /Q S ~ 10 -2  complementary technique to collinear laser spectroscopy  suitable for light elements (low Q S values)

18. Atomic hyperfine structure Interaction between an orbital e - (J) and the atomic nucleus (I,  I,Q S )  results in a hyperfine splitting (HFS) of the e - energy levels J n F  E HFS with  Hyperfine structure constants: and  Collinear laser spectroscopy:   /   ~ 10 -2,  Q S /Q S ~ 10 -1 for heavy elements

19. Isotope shift measurements Frequency shift between atomic transitions in different isotopes of the same chemical element  related to the mass and size differences J1, F 1 J2, F 2 J1, F 1 J2, F 2  A,A ’  mean square charge radius variations with a precision ~ 10 -3  study of nuclei shape (deformation)

20. N=50 N=40 Z=28 Z=40 The physics case for  -NMR on polarized beams: Ni Zn nuclear structure towards and beyond 78 Ni Evolution of orbits from Z=40 to Z=28: ground state spins and moments of 83 Ge, 81 Zn, 79 Ni and of 81 Ge, 79 Zn, 77 Ni  g-factors can reveal erosion of N=50 shell closure Produced at SPIRALII with d-induced fission Lifetime OK for  -NMR studies Ge Se Kr G. Neyens et al., KU Leuven

21. DESIR building costs Infrastructure Estimated costs Available funds DESIR building 6000 k€ 2000 k€ (CPER) RFQ 320 k€ 320 k€ (CPER) HRS 1000 to 1500 k€ - beam lines 3600 k€ - RFQ + off-line sources 200 k€ Total (preliminary) 11000 to 16000 k€

22. Collinear laser spectroscopy: Manchester300 k€ Orsay200 k€ Leuven150 k€  -NMR setup:Leuven100 k€  -charged particle setup:France, ANR VS3 2006240 k€ Spectroscopy setup:Madrid200 k€ TAS setup:Valencia180 k€ Neutron detection - multiplicity, TETRA setup: Dubna200 k€ - energy:LPC Caen and others 400 k€ MLL trap system:LMU München860 k€ MOT trap:KVI Groningen500 k€ Total (preliminary) 3300 k€ Equipments foreseen at DESIR LUMIERE BESTIOL

23. B. Blank, M.J.G. Borge, P. Cambell, F. Leblanc, M. Lewitowicz, D. Lunney, O. Naviliat-Cuncic, G. Neyens, B. Rubio, P. Thirolf, J.-C. Thomas and many more… Opened to everyone interested ----------------- http://www.cenbg.in2p3.fr/desir DESIR Milestones  Dec 2008: technical report (SPIRAL2 TAC)  2009: call for experiment proposals  2010: building design study  2011: construction of the building  end 2013: day 1 of operation