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The DESIR facility at SPIRAL2

The DESIR facility at SPIRAL2

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The DESIR facility at SPIRAL2

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  1. The DESIR facility at SPIRAL2 • SPIRAL2 at GANIL • SPIRAL2 Phase 1 and Phase 2 • New equipment at SPIRAL2 • DESIR facility • DESIR physics programme Bertram Blank CEN Bordeaux-Gradignan ISNP2009, BARC, Mumbai, 8-12 december, 2009

  2. Existing GANIL facility Phase 2 DESIR RIB PRODUCTION S3NFS Accelerator Phase 1

  3. SPIRAL2 buildings Advancement of building studies : Phase 1 : Detailed level Phase 2 : Preliminary level

  4. Neutrons for science Atomic & solid state physics Radiobiology & Isotope production Equation of State Role of Isospin Scientific case of SPIRAL2 Heavy and Super Heavy Elements ISOSPIN DEGREES OF FREEDOM IN NUCLEAR FORCES Position of drip-lines N=Z rp-process r-process path Shell structure far from stability Spins&Shapes Spins & Shapes Haloes & Structures in the Continuum www.ganil.fr/research/developments/spiral2/

  5. Gamma Array Particle Array New detectors at SPIRAL2 DESIR S3 NFS AGATA PARIS ACTAR GASPARD FAZIA EXOGAM 2 2006-2007: 19 Letters of Intent, 600 physicists from 34 countries 2008-2009: TDR for big instrumentation at SPIRAL2

  6. DESIR at GANIL GANIL – SPIRAL1 (S1) DESIR Production building SPIRAL2 (S2) S3 Low-energy beams from: S1, S2, S3

  7. S1: Low-energy beams from SPIRAL1 Projectile or target fragmentation at 95 MeV/A main interest: very neutron- and proton-rich light nuclei 1+  n+

  8. Converter n 2H UCx IS n 2H Target IS 2H UCx IS HI Target IS S2: Low-energy beams from SPRIAL2 • Fission, fusion • evaporation, DIC • main interest: • fission products • medium-mass • proton-rich nuclei e.g. 36Ar @ 20 MeV/A

  9. S3: Low-energy beams from S3 • Fusion-evaporation • reactions at Coulomb • Barrier, DIC • main interest: • very heavy nuclei • N=Z nuclei • very short-lived • isotopes • refractory elements Gas catcher LISOL G. Savard et al.

  10. Elements produced at ISOLDE / CERN … all elements available from S3

  11. The DESIR facility

  12. General purpose LN2 Control room Gas & waste storage IS TAS off-line source 1 Collinear Laser spectroscopy b-NMR off-line source 2 Penning trap + Decay setup MLL trap Double MOT RFQ bun- cher GPIB Paul trap DAQ room General purpose Neutron ditch Electronics Desk Access Laser room (mezzanine) DESIR hall Identification station with tape LUMIERE BESTIOL SAS Kitchen + WC (on top of CR) Beam from Level -1 Meeting room (on top of DAQ) Crane access to basement 5 m

  13. Assembly Room 3 Gray Room 2 Electri- city Stor- age 1 Stor- age 2 Gray Room 1 free Assembly Room 1 Assembly Room 2 Control Racks Interfaces HV supplies Crane access to basement 5 m Neutron ditch DESIR hall: level -1 Work shop Radio lab storage Beam from Production building, S3 and SPIRAL1 X Supply Limits of DESIR hall Identification and radioprotection measurements

  14. DESIR work packages • RFQ SHIRAC: Gilles Ban • HRS: Bertram Blank • DESIR building: Franck Delalee • General purpose ion buncher • GPIB + stable ion sources: Pierre Delahaye • Identification station: Philippe Dessagne • Beam transport lines: Francois Le Blanc • Safety and security: Jean-Charles Thomas • Command / Control, diagnostics: Stéphane Grévy

  15. The DESIR Technical Design Report • submitted on December 19, 2008 • presented to SPIRAL2 SAC on January 29, 2009 • strongly supported by SPIRAL2 SAC…. • about 100 pages of technical description of DESIR facility • and its equipment • co-signed by 111 physicists and engineers of 15 countries • contains a general description of buildings and interfaces • description of major installations like traps, spectroscopy • setups etc • report available on DESIR web page (www.cenbg.in2p3.fr/desir)

  16. LUMIERE Laser Utilisation for Measurement and Ionization of Exotic Radioactive Elements F. Le Blanc ,Orsay G. Neyens, Leuven P. Campbell, Manchester • Collinear Laser spectroscopy: • - spins • - magnetic moments • - quadrupole moments • - change of charge radii • b-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 ….

  17. Atomic hyperfine structure Interaction between an orbital e- (J) and the atomic nucleus (I,mI,QS) • results in a hyperfine splitting (HFS) of the e- energy levels n J with F DEHFS • Hyperfine structure constants: and • Collinear laser spectroscopy: DmI/mI ~ 10-2, DQS/QS ~ 10-1 for heavy elements

  18. Isotope shift measurements Frequency shift between atomic transitions in different isotopes of the same chemical element • related to the mass and size differences J2, F2 dnA,A’ J2, F2 J1, F1 J1, F1 • mean square charge radius variations with a precision ~ 10-3 • study of nuclei shape (deformation)

  19. B0 b-NMR spectroscopy b-asymmetry in the decay of polarized nuclei in a magnetic field • Zeeman splitting related to gI and QS M+I I M-I with and • resonant destruction of the polarization (i.e. b-asymmetry) by means of an additional RF magnetic field • DgI/gI ~ 10-3, DQS/QS ~ 10-2 • complementary technique to collinear laser spectroscopy • suitable for light elements(low QS values)

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

  21. Search for exotic interactions e+ nucleus q ne • b-n angular correlation requires to measure the recoil ion + b particle • within the SM x : Fermi fraction; r : GT/F mixing ratio • beyond the SM a contains quadratic S and T contributions O. Naviliat-Cuncic et al., LPC Caen

  22. CVC, CKM, exotic currents: 0+  0+ b decays = 3072.08 (79) s Measurements: - Q value - T1/2 - branching ratios  Vud0+0+ = 0.97425(22) VusK= 0.2254(21) VubB = 0.00367(47)  0.99995(61) J.C. Hardy et al.

  23. Experiment Theory Counts Energy (keV) Study of GT strength via b-delayed proton decay: 21Mg 21Mg J.C. Thomas

  24. b+ : p→n + e+ +  d = 4.8 (4) % b- : n→p + e- +  E.C. : p + e-→n +  ft- ft+ n p n p Mirror symmetry studies  = nuc + SCC • Allowed Gamow-Teller transitions (log(ft)<6) • 17 couples of nuclei • 46 mirror transitions Average asymmetry d : 11 (1) % in the 1p shell (A<17) 0 (1) % in the (2s,1d) shell (17<A<40) J.C. Thomas et al. (GANIL/CENBG)

  25. MLLTRAP • High-accuracy mass measurements • - unitarity of CKM matrix (Vud): 50Mn, 54Co with DM/M~10-10 • - transuranium isotopes (beams from S3): M(Z>102) • In-trap spectroscopy: • - conversion electron and a spectroscopy: shape coexistence • Trap-assisted spectroscopy • - b decay studies of isomerically pure radioactive species P. Thirolf , Munich Set-up being installed at MLL/Garching

  26. KVI atomic trapping facility • 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

  27.  correlation: MOT + RIMS +  detector SM  detector MeV MCP start -V0 0 +V0 Not SM TOF E// X,Y  E

  28. DESIR DESIR Operation of GANIL/SPIRAL1/SPIRAL2 Standard planning DESIR: 29 weeks of RIB/year: 10 weeks of RIB from SPIRAL2, 4 weeks from S3, 15 weeks from SPIRAL1

  29. Phase I Phase II SPIRAL2 Schedule

  30. Next steps...... • RFQ: on-going tests, study of “nuclearisation”, study of final version of RFQ • HRS: detailed optical study of new ALPHA version, detailed mechanical study • beam lines: preliminary design, cost estimate, detailed design study • stable ion sources: definition, purchase • GPIB: study and construction • Identification station: preliminary design, detailed design, construction • DESIR building: like SPIRAL2 Phase 2 construction program…. • decision about construction not before mid 2010 • ……

  31. Thanks for your attention