Grupo de Física Nuclear Experimental IEMIEM CSIC Madrid-Aarhus-Göteborg @ ISOL MAGISOL Meeting...

Grupo de Física Nuclear Experimental

IEM

CSIC

Madrid-Aarhus-Göteborg @ ISOL

MAGISOL Meeting 19-21 January 2009 Mª José Gª Borge

DESIR @ SPIRAL 2

Outline:GANILSPIRALSPIRAL2DESIR CollaborationExperiments at DESIRHighlightsPlanning


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GANIL / SPIRAL 2 GANIL / SPIRAL 2

LINAG (high intensity d and stable beams)

Production building

Existing GANIL facility

LIRAT

DESIRLow energy beams fromSPIRAL and SPIRAL2(and S3 ?)

S3High-intensity stable beams on thin target+ in-flight high-resolution separator+ gas cell for stopping+ ??

CIME

SISSI

LISE


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The The DESIRDESIR facility at SPIRAL2 facility at SPIRAL2

Désintégration, Excitation et Stockage d’Ions RadioactifsDecay, excitation and storage of radioactive ions

collaboration initiated during the first SPIRAL2 workshop, July 2005

to use SPIRAL2 and SPIRAL low energy (30-60 keV) beams for

decay spectroscopy

laser spectroscopy

ion and atom trap experiments

Spokes-person: Bertram Blank

GANIL liaison: Jean-Charles Thomas


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Beam requirements for ISOL-type experiments:

high degree of purity needed for exotic beams !

= good mass selectivity and element selectivity.

Suggested solutions for SPIRAL2 produced beams:

+ RFQ high-efficiency cooler/buncher for efficient reduction of beam emittance

+ high resolution mass separator

+ laser ionization source (element selection during ionization)


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Mª José Gª Borge

The The DESIRDESIR Facility Facility

The DESIR instalation:RFQ + HRS in the production building building close to GANIL/SPIRAL and SPIRAL2 FacilitiesRadioactive beams from GANIL, SPIRAL2 and S3

MAGISOL Meeting 19-21 January 2009


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SHIRaC = SHIRaC = SSPIRAL2 PIRAL2 HHigh igh IIntensity ntensity RaRadiofrequency diofrequency CCoolerooler

Prototype RFQ linear Paul trap, set up initially at CSNSM OrsayNow transferred to LPC Caen for further development

Goals: * high-voltage (20 kV), high frequency (20 MHz) linear radio-frequency quadrupole trap for strong confinement of A beams.

(gain factor 100 in confinement compared to present devices)

* incorporate an electrostatic quadrupole deceleration field (to reduce losses at the injection)

Results so far:* Prototype tested at high-current separator SIDONIE (Orsay)

a 1.1 A beam has been trapped (O. Gianfrancesco et al., Proc. EMIS2007)


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High Resolusion Mass SeparatorHigh Resolusion Mass Separator

symmetric design, inspired by the CARIBU HRS at Argonne National Laboratory:with two magnetic dipoles D combined as QQHQD M DQHQQ

six quadrupoles Qtwo sextupoles Hone multipole M

To minimize aberrations, provide large mass dispersion

Beam profile in x-directionSuggested layout

Status: in design phaseTo be incorporated in production building

High transmissionCompact (12m x 8m)Match beam emittance from RFQ coolerM/M = 20000


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DESIR PRODUCTION BUILDING

LINAG

EXISTING EXPERIMENTAL AREAS

CIME

EXISTING ACCELARATORS

CSS2

CSS1

S3

Schematic SPIRAL 2 LAYOUTSchematic SPIRAL 2 LAYOUT

Recent idea from 2007: send S3 radio-isotopes (re-ionized from gas cell) to DESIR set-ups for mass, radii, moments, decay studies ….


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The The DESIRDESIR experimental set-ups experimental set-ups

BESTIOLLUMIEREMOT LPCTrap


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LUMIERE

Light Utilization for Measurements and Ionization of Exotic Radioactive Elements

Nuclear properties deduced from observation of magnetic and electrostatic hyperfine structure in optical spectra.Techniques: Collinear Laser Spectroscopy

β-NMR (Nuclear magnetic Resonances)Key-Experiments: - Extending charge radii , moments and spins of nuclei around 78Ni and 132Sn (neutron-rich isotopes in the fission peaks) Charge radius changes in exotic Rb(N>90), Sr (N>100) and Yb (N>177) Hyperfine structure and charge radii of Trans-actinides Ground state spin of N = 49 and N = 51 isotones with even Z (β-NMR ) Charge radius of 100Sn (S3)


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BESTIOL (Beta dEcay at the Spiral2 IsOL Facility)

Beta-decay studies can be done with very low yield.Half-life determination. First glance into the structure of the nucleus.High production allows full spectroscopy degree of overlap between proton and neutron states in parent and daughter nucleus.Far from stability beta-delayed particle decay open.

Highlights: Super-allowed -decays and the standard model of electro-weak interaction Stellar nucleosynthesis at A 80 ; 80Zr New Magic numbers Shape coexistence, deformation and Gamow-Teller distribution Transition from order to chaos


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General Purpose Set up

DSSD-detectors for p Array of Clover detectors ToF for neutron spectroscopy. Need of fast tape station

Physics: Transition from order to chaos in neutron deficient nucleiSearch for new candidates to -2p emissionNew magic numbers: Characterization of 40Mg, 54Ca.Nuclei with large N/Z ratios need to be produced : 110Zr70

Odd-even stagering in the S2n of nuclei near 132Sn


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Double Penning –Trap assisted spectroscopy: Super-allowed -decays

Present knowledge of fundamental interactions summarized in standard model. Tested by high precision measurement (10-4) of super-allowed Fermi decays: Q,T,BR Ft = ft(1+’R)(1+NS-c) = K/MF

2G’2V

Study of N = Z odd-odd nuclei 82Nb, 86Tc, 90Rh , 94Ag and 98In

MLL-Trap built in Munich will serve to purified the beam

-Fast separation-Sufficiently high resolving power (M/M = 105)-high capacity (up to 106 ions)-high transmission ( > 30 %)


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Total Absortion Spectroscopy after the MLL-Trap

With very purified beams one can do Total absortion spectroscopy to obtain the BGT- distribution

Surrey-Valencia 12 BaF2 TAS


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Beta-delayed neutron Set up


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MLL trap system: LMU München 860 kEuros

-charged particle setup: France, ANR VS3 2006 240 kEuros

Collinear laser spectroscopy:Manchester 300 kEurosOrsay 200 kEuros Leuven 150 kEuros

-NMR setup: Leuven 100 kEuros

Spectroscopy setup: Madrid 200 kEuros

MOT trap: KVI Groningen 500 kEuros

TAS setup: Valencia 180 kEuros

Neutron detection (multiplicity, TETRA setup): Dubna 200 kEuros

Neutron detection (energy): (LPC Caen and others) 400 kEuros

Equipment to come to DESIR


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DESIR: Financial situation

Main parts: estimated costs fund available

• RFQ and HRS « building »: most likely included in SPIRAL2 project

• DESIR building: 6000 k€ 2000 k€ (CPER)

• RFQ: 320 k€ 320 k€ (CPER)

• HRS: 500 k€ -

• beam lines: 3600 k€ -

• off-line source 60 k€ -


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GANIL/SPIRAL 1 today

GANIL/SPIRAL 1 today

DESIR Facility low energy RIBDESIR Facility low energy RIB

RIB productionbuilding

RIB productionbuilding

LINACLINAC

S3S3

NFSNFS

SRISRI

Recent modifications:•High-intensity stable beam ion source (A/q=3) included in the baseline project•RIB laser source included in the baseline project•RFQ+HRS also for post-accelerated beams•Only one production cave in the production building•SRI hall not included in the Phase 1

Recent modifications:•High-intensity stable beam ion source (A/q=3) included in the baseline project•RIB laser source included in the baseline project•RFQ+HRS also for post-accelerated beams•Only one production cave in the production building•SRI hall not included in the Phase 1

RFQ+HRSRFQ+HRS


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Schedule of SPIRAL 2Schedule of SPIRAL 2

Decision on the construction of DESIR(dead-line)

Decision on the construction of DESIR(dead-line)

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