The DESIR low energy beam facility at SPIRAL2 DESRI Decay, Excitation and Storage of Radioactive Ions B. Blank, CENBG LEA.

The The DESIRDESIR low energy beam facility at SPIRAL2 low energy beam facility at SPIRAL2DDecay, EExcitation and SStorage of RRadioactive IIons

http://www.cenbg.in2p3.fr/desir

B. Blank, CENBG LEA workshop, Catania, 13-15 october 2008

Collaboration promoting ISOL beams at SPIRAL2

Spokes-person: B. BlankB. Blank, Bordeaux; blank@cenbg.in2p3.fr GANIL liaison: J.-C. Thomas,J.-C. Thomas, Caen; thomasjc@ganil.fr

DESIR @ SPIRAL2 Beam preparation The DESIR Facility Selected physics cases Cost estimates / Synergies / Milestones

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 atWhy a low energy beam facility at SPIRAL2SPIRAL2 ??

DESIRDESIR physics programphysics 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

SPIRAL2 layoutSPIRAL2 layout

GANIL/SPIRAL

S3

DESIRDESIR

Level -1

Level -1

LINAG

NFS

15 m

Production building

Fragmentation + ISOL95 A.MeV 36Ar 3 kW

n-induced 238U fission40 MeV 5 mA deuterons

1014 fissions/s

Fusion reaction14 A.MeV A/Q=3 HI, 1 mA

SRI

8m

12m

HRS

RFQ

storage and maintenance

Legend:

Electronics

Quadrupole

Sextupole

Multipole

Dipole

RFQ and HRS cave in the production building

Production building

SHIR

aCSH

IRaC

SHIRaCSHIRaC SSPIRAL2 PIRAL2 HHigh igh IIntensity ntensity RaRadiofrequency diofrequency CCoolerooler

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

High resolusion mass separatorHigh 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 ~ 2.104 for a 1 .mm.mrad at 10 to 60 keV

Beam profile in x-direction

Suggested layout

T. Kurtukian-Nieto, CENBG

DESIR layout – level 0Laserroom

(mezzanine)

DA

Qroom

Controlroom

MLL trap

Collinea

r Las

er

spec

trosc

opy

-NMR

RFQbun-cher

off-linesource1

off-linesource2

+

Decay

setup

LPCtrap

Beam from SPIRAL1

Beam from S3

Bea

m fr

om

Prod

uctio

n bu

ildin

g

Generalpurpose

ElectronicsDeskAccess5 m

Level -1

Level 0

TAS

Neutronditch

Leve

l -1

Crane access to basement

Double MOT

Genera

l

purpose

IS

Identification station with

tape

LN2Gas &

w

aste storage

LUMIERE BESTIOL

Supply

Electri-city

Gray Room 2

Gray Room 1

AssemblyRoom 3

ControlRacks

Interfaces

HV

supplies

Crane access to basement

Stor- age 1

Assembly Room 2

Assembly Room 1

Stor- age 2

Radiolab

5 m

storage

Neutronditch

DESIR layout - Level -1

Limits DESIR hall

freeBeam from SPIRAL1

Bea

m fr

om

Prod

uctio

n bu

ildin

g

Workshop

Beam from S3

X

Refractory elementsFor ISOL-type studies

• 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 ….

LUMIERELUMIERELLaser aser Utilisation for tilisation for MMeasurement and easurement and

IIonization of onization of EExotic xotic RRadioactive adioactive EElementslements

F. Le Blanc ,OrsayF. Le Blanc ,OrsayG. Neyens, LeuvenG. Neyens, LeuvenP. Campbell, ManchesterP. Campbell, Manchester

• 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, Pn and nuclear structure (r-process) • ...

BESTIOLBESTIOLBEBEta decay STSTudies at the SPIRAL2 IIsOLOL facility

TETRA, Y. Penionzhkevich (Dubna)TAS, B. Rubio (Valencia) setup, B. Blank (Bordeaux)

M.J.G. Borge, MadridM.J.G. Borge, MadridB. Blank, BordeauxB. Blank, Bordeaux

MLLTRAPMLLTRAP

•High-accuracy mass measurements - unitarity of CKM matrix (Vud): 50Mn, 54Co with M/M~10-10

- transuranium isotopes (beams from S3): M(Z>102) • In-trap spectroscopy: - conversion electron and spectroscopy: shape coexistence • Trap-assisted spectroscopy - decay studies of isomerically pure radioactive species

P. Thirolf , MunichP. Thirolf , Munich

Set-up being installed at

MLL/Garching

KVI atomic trapping facility: MOTKVI 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, GroningenH. Wilschut, Groningen

Experimental set-up at KVI

detector

MCP

-V0 +V00

• 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 interactionsSearch for exotic interactions

O. Naviliat-Cuncic et al., LPC CaenO. Naviliat-Cuncic et al., LPC Caen

e+

e

nucleus

Vud

0+0+ = 0.97418(26)

VusK = 0.2254(21)

VubB = 0.00367(47)

= 3071.4 (8) s

2 2 2 2 = + + 0.9967(13= )ui ud us ubi

V V V V

CVC, CKM, exotic currents: 0+ CVC, CKM, exotic currents: 0+ 0+ 0+ decaysdecays

Measurements: - Q value - T1/2 - branching ratios

1.0000(11)

)211)(m)(.(3cos

1)4I(2IQ3h.

Lh.ΔE 21-mm,

θ

-NMR spectroscopy-NMR spectroscopy

h.B.

L0N Ig

-asymmetry in the decay of polarized nuclei in a magnetic field Zeeman splitting related to gI and QS

IM+I

M-I

resonant destruction of the polarization (i.e. -asymmetry) by means of an additional RF magnetic field

h.V. ZZ

QSQe

with and

B0

gI/gI ~ 10-3, QS/QS ~ 10-2

complementary technique to collinear laser spectroscopy

suitable for light elements (low QS values)

Atomic hyperfine structureAtomic hyperfine structure

Interaction between an orbital e- (J) and the atomic nucleus (I,I,QS) results in a hyperfine splitting (HFS) of the e- energy levels

Jn

FEHFS1)J(J1)I(I1)F(FK with

I.J(0)Hμ eIA Hyperfine structure constants: and (0)Ve zzSQB

1)I.J1)(2J2(2I

1)1)J(JI(I1)K(K43

..K2

ΔEHFS

BA

Collinear laser spectroscopy: / ~ 10-2, QS/QS ~ 10-1 for heavy elements

Isotope shift measurementsIsotope shift measurements

Frequency shift between atomic transitions in different isotopes of the same chemical element

related to the mass and size differences

A'A,2SMSNMS

A' A, rF.A.A'

A)(A').K(K

J1, F1

J2, F2

J1, F1

J2, F2

A,A’

mean square charge radius variations with a precision ~ 10-3

study of nuclei shape (deformation)

N=50N=40

Z=28

Z=40

The physics case for -NMR on polarized beams:

NiZn

nuclear structure towards and beyond 78Ni

Evolution of orbits from Z=40 to Z=28:

ground state spins and momentsof 83Ge, 81Zn, 79Ni and of 81Ge, 79Zn, 77Ni

g-factors can reveal erosion of N=50 shell closure

Produced at

SPIRALII

with d-in

duced fis

sion

Lifetime OK for -NMR studies

GeSe

Kr

G. Neyens et al., KU Leuven

DESIRDESIR building building costscosts

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€

Collinear laser spectroscopy:Manchester 300 k€Orsay 200 k€ Leuven 150 k€

-NMR setup: Leuven 100 k€

-charged particle setup: France, ANR VS3 2006 240 k€

Spectroscopy setup: Madrid 200 k€

TAS setup: Valencia 180 k€

Neutron detection - multiplicity, TETRA setup: Dubna 200 k€ - energy: LPC Caen and others 400 k€

MLL trap system: LMU München 860 k€

MOT trap: KVI Groningen 500 k€

Total (preliminary) 3300 k€

Equipments foreseen at Equipments foreseen at DESIRDESIRLU

MIER

EB

ESTIOL

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 interestedOpened to everyone interested-----------------

http://www.cenbg.in2p3.fr/desir

DESIRDESIR Milestones 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