low-energy physics in france sira at ganil ̵ charge radius of 6 he lirat at spiral1/ganil ̵ ...
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Low-energy physics in FranceLow-energy physics in France
• SIRa at GANIL̵� charge radius of 6He
• LIRAT at SPIRAL1/GANIL̵� -b n angular correlations: LPCTrap̵� mirror b decays̵� branching ratio measurements of 0+ - 0+ b decays̵� spectroscopy of proton-rich nuclei: GT strength distribution
• ALTO at Orsay̵� nuclear structure studies
• DESIR and S3-LEB at GANIL̵� the future ISOL facilities of GANIL
Bertram BlankCEN Bordeaux-Gradignan
NuPPEC mini-workshop, GANIL, 09/10/2015
LIRAT
LIRAT
LPCTrap
Production target ECR source
Beams characteristics:
• 10-30 keV, 80 p mm mrad
SPIRAL1 beams: 10-30 keVDE ~ 20eV
SIRa and LIRAT at GANILSIRa and LIRAT at GANIL
SIRa beams: 10-30 keVDE ~ 20eV
SIRa: Charge radii of 6He and 8HeSIRa: Charge radii of 6He and 8He
SIRa: Charge radii of 6He and 8HeSIRa: Charge radii of 6He and 8He
laser spectroscopy in a MOT:Dn = nA – nA’ = dnmass + dncharge
6He: 108pps 8He: 5*105pps
P. Mueller et al.
SPIRAL1 beamsSPIRAL1 beams
SPIRAL1 / LIRAT beamsSPIRAL1 / LIRAT beams
Nanogan ECR sourcepresently in operation
FEBIAD ion sourcePart of SPIRAL1 upgradeSurface ionisation source
Expected yields:
P. Delahaye et al.
LIRAT: weak-interaction studiesLIRAT: weak-interaction studies
• -b n angular correlation measurements• mirror b decays• 0+ - 0+ b decay
] b )cos( [1 W(E)θ)W(E,Em
cve a
Test of V - A theory: a (CS, CV, CT, CA)
Pure GT: aGT (CT, CA)
Pure F: aF (CS, CV)
)C1)(t(
KV
22
ud
F
parameters: M, T1/2 , BR r am (r)
Naviliat & Severijns PRL102(2009)Mirror decays = alternative to 0+ 0+
Severijns et al. RMP78(2006)
• Goals
Current limits: CT /CA < 9% CS /CV < 7%
(allowed transitions, non-oriented nuclei)
Mirror decays: Transition |Vud|
Super-allowed pure FermiNeutronPionSuper-allowed mirror
0.97425 (22)0.9746 (13)0.9728 (30)0.9719(17)
Determination of Vud, test of CKM unitarity:
Standard Model tests with b decayStandard Model tests with b decay
9
HV
Pulsed cavity Paul TrapRFQ
(Cooling & bunching)Pulsed cavity
10 keV 100 eV - <1 eV 1 keV 100 eV 0 eVKEion :
DKE: ~20 eV ~1 eV ~0.1 eV
• Buffer-gas: H2 (He for heavier nuclei)
• accumulation: 200ms (cycle)
~2×108 6He+/s ~2×104 6He+ /cycle
Total efficiency: ~5×10-4
Beam from
LIRAT
LPCTrap at LIRATLPCTrap at LIRAT
X. Fléchard, E. Liénard et al.
• Tensor contribution: First result:
GT: 6He (Johnson et al., PRC 1963) aGT = -0.3308 (30)
Current limits: CT /CA < 9% Severijns & Naviliat PST152(2013)
0
500
1000
1500
2000
500 600 700 800 900 1000
-2
0
2
Cou
nts
P value = 0,71ExperimentFit
Nor
mal
ized
resi
dual
s
ToF (ns)
• Tensor contribution: New result:
Fléchard et al., JPG 38 (2011) abn = - 0.3335 (73) stat (75) syst
2000 2500 3000
-4-2024
10
100
1000
10000
Nor
mal
ized
resi
dual
sC
ount
sTOF (ns)
experiment fit
(DaGT /aGT )expected~ 0.63 %
-b n angular correlations with LPCTrap: 6He-b n angular correlations with LPCTrap: 6He
)C1)(t(
KV
22
ud
Fparameters to be measured:
M (fV), T1/2, BR and r
r = GT/F : least or even unknown quantity
0
2
4
6
8
10
19Ne 21Na Mg23 P29 Cl33 Ar35 K37
Par
ts in
10
3
Parent nucleus
QEC (fV)
t1/2
BR
dR
dC-dNS
r
QEC(fV)
T1/2
BR
dR
dC-dNS
19Ne 21Na 23Mg 29P 33Cl 35Ar 37K
not
mea
sure
d
not
mea
sure
d
10.1
175.
4
57.3
48.1
)1(
)1(23
²
ma
Mirror b decays: CVC and Vud Mirror b decays: CVC and Vud
Preliminary results from LPCTrapPreliminary results from LPCTrap
2000 4000 6000 8000 100000
5000
10000
15000
20000
25000
30000
Cl4+
Cl3+
Cl2+
Cou
nts
Time of flight (ns)
Cl+~1,5 106 "good events"
Couratin et al. PRA (2013)
74.6 (1.0) %
17.3 (0.4) %
5.7 (0.2) %
1.7 (0.2) %< 1 %
1+ 2+ 3+ 4+ 5+0.0
0.2
0.4
0.6
0.8
1.0
3+ 4+ 5+0.00
0.02
0.04
0.06
Cha
rge-
stat
e br
anch
ing
ratio
Recoil ion charge
Experiment Theory with Auger Theory without Auger
87.5 (0.9) %
11.8 (0.3) %
0.7 (0.2) %
1+ 2+ 3+ >4+0.0
0.2
0.4
0.6
0.8
1.0
3+ >4+0.00
0.01
0.02
0.03
Cha
rge-
stat
e br
anch
ing
ratio
Recoil ion charge
Experiment Theory with Auger Theory without Auger
35Ar: 19Ne:
(Dam /am )expected~ 0.25 % (Dam /am )expected~ 18 %
Precision T1/2 measurement of mirror nucleiPrecision T1/2 measurement of mirror nuclei
17F
21Na
33Cl
improvements achieved:
J. Grinyer et al.
Super-allowed b decay: 0+ → 0+Super-allowed b decay: 0+ → 0+
14 best known cases…
Super-allowed b decay: 0+ → 0+Super-allowed b decay: 0+ → 0+
18Ne added…
Super-allowed b decay: 0+ → 0+ of 18NeSuper-allowed b decay: 0+ → 0+ of 18Ne
BR = 7.285(51)%
H. Bouzomita, G.F. Grinyer, J.-C. Thomas et al.
Super-allowed b decay: 0+ → 0+ of 18NeSuper-allowed b decay: 0+ → 0+ of 18Ne
H. Bouzomita, G.F. Grinyer, J.-C. Thomas et al.
18Ne
LIRAT: nuclear structure studiesLIRAT: nuclear structure studies
• Gamow-Teller strength distribution 33Ar
Experimental setup: Silicon cube detectorExperimental setup: Silicon cube detector
• 6 DSSSDs with 16 * 16 strips 50 cm x 50 cm• 6 Plenar silicon detector 50 cm x 50 cm• 3 EXOGAM clover detectors
I. Matea et al., NIM A607 (2009) 576
Proton and g-ray spectra from 33ArProton and g-ray spectra from 33Ar
• proton singles spectrum• protons spectrum avec g coincidence• g-ray spectrum
N. Adimi et al., PRC81 (2010) 024311
33Ar
Quasi complete decay schemeQuasi complete decay scheme
Experiment
N. Adimi et al., PRC81 (2010) 024311
Gamow-Teller strength distributionGamow-Teller strength distribution
33Ar
N. Adimi et al., PRC81 (2010) 024311
ALTO: nuclear structure studiesALTO: nuclear structure studies
PARRNe mass separator
e-LINAC 10 µA 50MeV
(former 1st section of the
CERN LEP injector)
TIS vault>~1.10^11 fissions/s
Target Ion-source ensemblekicker - bender secondary
beam lines
Hall 110experimental
setups
identification station
BEDObeta decay
spectroscopy
ALTO : the e-driven ISOL facility in OrsayALTO : the e-driven ISOL facility in Orsay
D. Verney et al.
LASER ION SOURCE
refractory
Lanthanide RegionSemi refractory (slow release from UCx)
Semi refractory
The variety of the physics program at ALTO strongly depends on RIB availability, intensity and purity
IN-TIS CHIMISTRY
fluorination
efficiency, Z-selectivity
improvement
first successfully laser ionized beam
Phys. Rev. C 88, 047301 (2013)
Progress in beam availability and diversityProgress in beam availability and diversity
D. Verney et al.
BEDO setup neutron detection
TETRAfast timing
LaBr3
up to 5 Ge detectors (ε = 5-6%)4π β trigger
80 3He tubes ε(252Cf) = 53%borated polyethylene shielding
Fast-timing studies using
LaBr3 detectorsA. Etilé, D. Verney et al
Phys. Rev. C 91, 064317 (2015)PhD: D. Testov (IPN)submitted to NIM A
M.A. Cardona, D. Hojman, B. Roussière, I. Deloncle et al.
to be submitted to EPJ A
Nuclear structure in b decayNuclear structure in b decay
Heyde & Wood, Rev. Mod. Phys. 83 (2011)
shape coexistences:a general phenomenon?
50
?50
82Ge→8233As49
problem of the spectral distribution of 1+ states in the N=50 region:→ responsible for the half-life of the mother nucleus, possible consequences on the r-process)interpreted by the theoretical work of Severyukhin… Giai et al. (influence of couplings to 2p-2h and tensor interaction)
ubiquitous presence of intruder states of the type 1p-2h → signature of shape coexistence
νg9/2
50
νd5/2
1+
1p-2hconclusion: an «island of inversion» is « missed » at N=50 by 0.5 MeV only !
Though this phenomenon seems to concern all shell-closure regions: not a single study at N=50 for more than 3 decades!(Z=50 a textbook case)
A. Etilé et al., Phys. Rev. C 91, 064317 (2015)
Results from BEDO in -delayed γ-spectroscopy modeResults from BEDO in -delayed γ-spectroscopy mode
BEDO/TETRA(existing)
LINO(project)
TAS(project)
TETRA(existing)
Identification station
Parrne mass separator
POLAREX(project)
MLL Trap(project)
LTNO (3He/4He)
Mass measurements
Laser-Induced nuclear orientation (µ,Q, Jp)
Present setups and near-future projectsPresent setups and near-future projects
DESIR - S3-LEB: low-energy facilities for GANILDESIR - S3-LEB: low-energy facilities for GANIL
SPIRAL1
S3
From -9.8 to +7.15 m; 4 levels ~ 2200 m2 (hall = 1200 m2) Exp. Hall at -3.25 m
Facility layoutFacility layout
20162018
2020
Update of the scientific programhttp://www.cenbg.in2p3.fr/desir/-DESIR-S3-LEB-workshop-
• Laser spectroscopy • b-delayed g spectroscopy• b-n angular correlation• Mass measurements• b-delayed charge part., b-n emission• (Trap-assisted) b-decay, Full absorption
spectroscopy
S3-LEB
SPIRAL 1 Upgrade
SPIRAL 2 Phase 2
letters of intent presented at the joint DESIR – S3-LEB workshop (GANIL, March 2014)
100Sn
A~150
Very (Super)-heavyN~Z
Fundamentalinteractions
Closed shells(Z≤28, N≤28; N=50)
b-n
Physics programmePhysics programme
ConclusionsConclusions
rich physics programme
DESIR with S3-LEB and SPIRAL1 (upgraded “SPIRAL1+” and possible future
upgrades “SPIRAL1++”) will allow for an exciting low-energy programme
pity that SPIRAL2 phase it “postponed” until 2025
Thank you for your attention
List of DESIR (updated) LoIs presented at the DESIR – S3-LEB workshop held at GANIL in March 2014
In-trap decay studies1. E. Liénard et al., LPC Caen, “High precision measurement in mirror b decays to test the CVC hypothesis and the CKM unitarity”2. X. Fléchard et al., LPC Caen, “Search for exotic couplings using precision measurements of nuclear b decay” 3. P. Delahaye et al., GANIL, “Test of the time reversal symmetry in the beta decay of 23Mg and 39Ca using an in-trap polarization
method at DESIR”4. B. Blank et al., CENBG, “Search for scalar currents with b-delayed proton emitters”5. S. Grévy et al., CENBG, “In-trap decay spectroscopy to measure neutron energies”
Radioactive decay studies6. T. Kurtukian Nieto et al., CENBG, “High precision measurements of half-lives and branching ratios in mirror b decay”7. H. Guérin et al., CENBG, “High precision studies of the super-allowed beta decay of Tz = 0, -1 and -2 nuclei”
8. J. Giovinazzo et al., CENBG, “Study of the beta-delayed two-proton decay”9. A. Algora et al., IFIC Valencia, “Beta strength measurements in the 100Sn region”10. B. Blank et al., CENBG, “Search for cluster radioactivity in the region above 100Sn”
Laser spectroscopy11. T. Cocolios et al., Univ. Manchester, “From N=Z=28 to the proton drip line at LUMIERE”12. M. Bissell et al., IKS Leuven, “Collinear laser spectroscopy of neutron deficient isotopes of Ag and Sn across the N=50 shell closure”13. D. Yordanov et al., IPN Orsay, ”Laser spectroscopy of very neutron deficient indium and cadmium isotopes”
Mass measurements14. Ch. Weber et al., LMU Munich, “Mass Measurements with MLLTRAP at DESIR: Transfermium nuclides & super-allowed b emitters
revisited”15. D. Lunney et al., CSNSM Orsay, “The mass of 100Sn and the extraordinary binding of N = Z nuclides”16. M. MacCormick et al., IPN Orsay, “High-resolution mass measurements of odd-odd T=1 nuclides”17. D. Lunney et al., CSNSM Orsay, “Mass measurements for SPIRAL2 - phase 1+: mapping the proton drip line in the A=150 region”18. P. Ascher et al., MKPI Heidelberg, “Mass measurement of light nuclei using an MR-TOF-MS or a Penning Trap @ DESIR”
Status of the DESIR project
SPIRAL 1 Upgrade
SP1-U
S3-LEB
S3-LEB
S3-LEB
SP1-U 8 LoI with upgraded SPIRAL1 beams and 10 with S3-LEB beams
DESIR Steering Committee and Collaboration Council meeting, 10/10/14 - GANIL, Caen
Status of the DESIR project
Budget
Cost estimates (Sept. 2015):
Building (2180 m2): 15.9 M€
Beam lines (~140 m): 5.6 M€
RFQ and HRS: 2.5 M€
Total (10% overheads): 21.5 M€
Funding:
• EQUIPEX: 8.0 M€
• Franco-german agreement: 13.5 M€
• CPER: 2.0 M€
DESIR Steering Committee and Collaboration Council meeting, 10/10/14 - GANIL, Caen
1) continuous progress in beam availability and diversity
2) continuous progress in instrumentation availability and diversity
ALTO - the first photo-fission ISOL facility
recent achievements and short-term perspectives
Stable + ISOL beams ~ 4000 h per year(parallel beams)~250 external users (30 countries)/year
ALTO TNA within ENSAR and ENSAR2
-delayed γ-spectroscopyhas been performed since the dawn of the
ALTO project
some of the experiments were largely pioneering at there time
the problems addressed up to now were centered around the
evolution of the N=50 shell closure towards 78Ni
ALTO – official start of the facility in 2012
132Sn100Sn
rp process r process• more accurate theoretical lifetimes of the N=82 isotones below 129Ag• shell quenching vs deformation• shell effect in radii
b-delayed spectroscopy of laser-polarized beamsground and isomeric state properties of 110-126Ag and 128-133In
β-decay of polarized 121-126Ag and 128-133In
LINO: Laser-induced nuclear orientationD. Yordanov et al.
polarisation by optical pumpingµ & Q from nuclear magnetic resonanceβ-delayed spectroscopy of laser-polarized beams
LINO: Laser-induced nuclear orientation
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