The The DESIR DESIR low energy beam facility at SPIRAL2 low energy beam facility at SPIRAL2 D D ecay, E E xcitation and S S torage of R Radioactive I I ons 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. Blank B. Blank, Bordeaux; [email protected]GANIL liaison: J.-C. Thomas, J.-C. Thomas, Caen; [email protected]DESIR @ SPIRAL2 Beam preparation The DESIR Facility Selected physics cases Cost estimates / Synergies / Milestones
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The DESIR low energy beam facility at SPIRAL2 DESRI Decay, Excitation and Storage of Radioactive Ions B. Blank, CENBG LEA.
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
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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
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
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
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
• 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)
•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