RNB at GANIL - · PDF file14/06/06 M. Lewitowicz 1 GANIL/SPIRAL facility Recent highlights...

14/06/06 M. Lewitowicz 1

GANIL/SPIRAL facilityRecent highlights

Future SPIRAL 2 facilityLayout of the facilityScientific opportunitiesLetters of Intent for SPIRAL 2

RNB at GANILfrom SPIRAL to SPIRAL 2

See also talks of: Y. Blumenfeld, G. Georgiev and J.M. Daugas

ParisCaen

14/06/06 3CYCERONCYCERON

Guest HouseGuest House

CIRILCIRIL

Experimental AreaExperimental AreaAcceleratorsAccelerators

OfficesOffices

RestaurantRestaurant

14/06/06 4

STABLE BEAMSSTABLE BEAMS

• from C to U

• energies up to 95 A.MeV

• intensities up to 2.1013 pps (6 kW)

RIB production schemesRIB production schemes• in-flight method : SISSI, LISE• ISOL method : SPIRAL (SIRA)

•Use of this two techniques inthe same lab is a uniquefeature

Layout of the GANIL facility

Up to 10000 hours of stable and radioactive beams per year

14/06/06 5

Ion Source

CSS1

CSS2

Heavy-Ion Stable Beam

GANIL/SPIRAL

Container Target

ECRISCIME

Heavy-Ion Radioactive Beam

Target & Ion Source Carbon Target

Marek Lewitowicz GANIL

Available and possible RIBs at SPIRAL

AvailableAvailable, to be controlledPossible, to be controlledR&D possibleSeen with the Shypie source

Kr

Ar

Ne

He

N10 20 30

Z

10

20

74 76

18

6 8

FON

Used for experiments7 elements, about 40 isotopes

PURE RI BEAMS ! ...and recently 15O, 24,26Ne, 44,46Ar

IonI (pps)and E

6He1+3x107

5 AMeV

8He1+,8He2+6x105,3x104

3.4,15.4 AMeV

18Ne4+2x106

7 AMeV

76Kr11+,74Kr11+5x105, 1x104

4.3 AMeV

About 17 different RIB used in exp. 200 RIB shifts/year

14/06/06 7I. Stefan

16FEx,Γx,Jπ

H(15O,p)15OElastic scattering

Si detector15O Spiral beam2 107 pps1.2 MeV/A

Best resolution at 0°

16F structure

(Ex, Jπ, Γ)

R-matrix

Energy (au)Cro

ss-s

ectio

n (a

u)

H(14N,p)14N

H(15N,p)15N

Polypropylene target (H6C3)thickness 2.7 mg/cm2

protons scatteredfrom the target

FWHM=13.4 keV for5.486 MeV α

Experimental study of 16F

14/06/06 8I. Stefan

Elab(MeV)

15N(p,p)15N

Elab(MeV)

14N(p,p)14N

15O(p,p)15O

Elab(MeV)

15OEx,Γ,Jπ

R-matrix

16OEx,Γ,Jπ

R-matrix

H(14N,p)14N

H(15N,p)15N

Sp=7.297 MeV

Sp=12.127 MeV

Sp= - 0.536 MeV

dσ/dΩ

(mb/

st)

Гp=1.3 keV

dσ/dΩ

(mb/

st)

16FEx,Γ,Jπ

R-matrix

H(15O,p)15O

dσ/dΩ

(mb/

st)

Measured excitation functions

PRELIMINARY

14/06/06 9I. Stefan

What about the 15O(p,γ)16Fgs(β+) ?

p

r (fm)

p

β+

E0

p

β+

γ E1

Vc (

MeV

)

p

G.Audi, A.H. Wapstra and C. Thibault, Nucl. Phys. A729, 337 (2003); D.R. Tilley et al., Nucl. Phys. A564, 1(1993)

Competitive reaction rate ?

15O+p16F

E0= 0.536 MeV

16O

E1= 0.734 MeV

1/2-

1-

0- γ M1 τγ=1 ps

Qβ=13.3 MeV

β+

PRELIMINARY

Collapse of the N=28 shell closure in 42Si

Collapse of the N=28 shell closure in 42Si - Beyhan BastinBeyhan Bastin

C Be4444SS4848CaCa 4242SiSi

4242SiSi

_Ean

M/Q

4242SiSi

_Ean

M/Q

SPEG

48Ca

47K

44S

42Si

45Cl

43P

46Ar

N=28

Experimental set-upExperimental set-up In-beam In-beam γγ Spectroscopy: Spectroscopy:

GANIL-Caen

SISSI+ALPHA SPEG

4444SS

PRELIMINARY



Results: Results: 3838SiSi

48Ca

47K

44S

42Si

45Cl

43P

46Ar

N=28

41Si40Si39Si38Si37SiZ=14

500 1000 1500 2000 2500E(keV)

2+ 0+ : 1081 ± 8 keVref: 1084 ± 20 keV

1185 ± 10 keV NEW

PRELIMINARY



ResultsResults: : 4040SiSi

48Ca

47K

44S

42Si

45Cl

43P

46Ar

N=28


500 1000 1500 2000 2500E(keV)

2+ 0+ : 991 ± 10 keVref: 990 ± 20 keV

624 ± 10 keVNEW

PRELIMINARY



ResultsResults: : 4242SiSi

48Ca

47K

44S

42Si

45Cl

43P

46Ar

N=28


500 1000 1500 2000 2500 E(keV)

2+ 0+ : 770 ± 15 keV NEW

To be p

ublis

hed

PRELIMINARY



48Ca

47K

44S

42Si

45Cl

43P

46Ar

N=28


In contradiction with J.Fridmann et al. [Nature vol.435(2005)03619]

LOW LOW energyenergy observed for the first 22++ state in 42Si 4242Si = Si = deformed deformed nucleusnucleus

Loss Loss of of magicitymagicity at N=28 for Si isotopes

0

1000

2000

3000

4000

16 18 20 22 24 26 28 30 32N

E(2+) (keV)

Ca S SiMagicityMagicity

DeformationDeformation

PRELIMINARY

Andreas Görgen 15

Shapes of atomic nuclei

Prolate

Oblate

Quadrupole deformation of the nuclear ground states

M. Girod, CEA Bruyères-le-Châtel

oblate ground states predicted for A~70 near N=Z prolate and oblate states within small energy range ⇒ shape coexistence

Andreas Görgen 16

Systematics of the light krypton isotopes

Inversion of ground state shape for 72Kr

Coulomb excitation to determine the nuclear shapes directly

0+

2+

6+

0+

4+

710671

612

791

0+

0+

2+

4+

6+

508456

768

558

52

0+

0+

2+

4+

6+

770

424

824

611346

0+

0+

2+

4+

6+

1017

455

858

664 562

72Kr 74Kr 76Kr 78Kr

prolate oblate

E. Bouchez et. al., Phys. Rev. Lett. 90, 082502 (2003)

energy of excited 0+ E0 strengths ρ2(E0) configuration mixing

Mixing of the ground state

72 · 10-3 85 · 10-3 79 · 10-3 47 · 10-3 ρ2(E0)

Andreas Görgen 17

Coulomb excitation of 74Kr and 76Kr

SPIRAL beams 76Kr 5×105 pps74Kr 104 pps

4.7 MeV/u

EXOGAM

Pb

Acta Phys. Pol. B 36, 1281 (2005)

PRELIMINARY

Andreas Görgen 18

Quadrupole moments Q0 in 74Kr and 76Kr

74Kr 76Kr

0+1

2+1

4+1

6+1

0+2

2+2

(4+ )2

0+1

2+1

4+1

6+1

0+2

2+3

direct confirmation of the prolate – oblate shape coexistence first reorientation measurement with radioactive beam

E. Clément et al., to be published

+ 1.85 eb +0.85 -0.79

+ 2.11 eb +1.22 -0.42

+ 3.13 eb +0.80 -1.25

− 0.86 eb +0.73 -0.60

+ 2.50 eb +0.80 -0.80

+ 4.66 eb +0.80 -0.80

+ 5.07 eb +0.70 -0.70

− 3.40 eb +1.30 -1.30

PRELIMINARY


Study of the N=28 shell closure in Ar chain through (d,p) reaction

First experiment withradioactive beam of

46Ar @ 10 MeV.ASPIRAL/GANIL CD2

θp, Ep

47Ar

θp,Epdd

28f7/2

p3/2

p1/2

46Ar28

f5/2

Transfer reaction (d,p)

47Ar29

p

ν

1.133.33 5.50

GS FWHM : 175 keV

L.Gaudefroy et al.to be published in Phys. Rev. Lett.

See talk of Y. Blumenfeld tomorrow

SPEG

MUST array

Proton drip-line Light nuclei

GANIL discoveriesExotic nuclei

CIME CyclotronAcceleration of RI Beams

E < 25 AMeV,1 - 8 AMeV for FF

Production CaveC converter+UCx target

≤ 1014 fissions/s

Superconducting LINACE ≤ 14.5 AMeV for heavy Ions A/q=3

E ≤ 20 A MeV for deuterons (A/q=2 ions)E ≤ 33 MeV for protons

Low energy RNB(DESIR)

Heavy-Ion ECRsource (A/q=3), 1mA

Deuteron source 5mARFQStable Heavy-Ion Exp.

Hall

Direct beam line CIME-G1/G2 caves

Existing GANILExp. Area

Existing GANIL Accelerators


Layout of the SPIRAL 2 LINAC

x12 x18

E ≤ 20 A MeV, 5mA, deuterons (A/q=2 ions)E ≤ 33 MeV 5mA, protonsE ≤ 14.5 AMeV , 1mA, heavy Ions A/q=3

(extension possible for A/q=6)

MOU with SARAF


LINAG Heavy-Ion Beam Challenge

Choice of the HI source:• Phoenix V2 - competitive for A<50• A-Phoenix - competitive for A<70 (but not included in the

construction budget)• A/Q=6 extension (4 times more expensive than A-Phoenix)

Marek Lewitowicz, GANIL 14/06/06

C

Source

UCx

2000°C

diffusion / effusiondeuterons

40 MeVneutrons

1+ n+

C

Source

UCx

2000°C

diffusion / effusiondeuterons

40 MeVneutrons

1+ n+

5mA

Goal : Up to 1014 fissions/s

Fast neutron induced fission


SPIRAL 2 yields of fission fragment after acceleration compared to other RNB facilities (best numbers for all)

Today Today


Rough Estimation of Yields (Examples)

6x106 - 7x109ISOL19F(p,2n)18Ne18Ne

2x106 - 2x108ISOL35Cl(p,2n)34Ar34Ar

107 - 3x1011ISOL14N(p,α)11C11C

< 3x104In-flight24Mg+58Ni80Zn

104 - 108Batch mode58Ni(p,n)58Cu58Cu

2x104 - 108Batch mode58Ni(p,p2n)56Ni56Ni

3x107 - 1010ISOL15N(d,2n)15O15O

5x107 - 1012ISOL9Be(n,α)6He6He

Yield (min. -max.) in pps

ProductionmethodReactionRI

Beam

Light and N=Z RIB at SPIRAL 2

Reactions to be used: transfer, fusion-evaporation, deep-inelastic


Fusion reactionwith n-rich beams

Fission products (with converter)

N=Z Isol+In-flightTransfermiums In-flight

Fission products (without converter)

High Intensity Light RIB

SHE

Deep Inelastic Reactions with RIB

Regions of the Chart of Nuclei Accessiblewith SPIRAL 2 Beams

Production of radioactive beams/targets: (n,α), (p,n) etc.

light beamsheavy ionsRIB induced reactions


RIB ProductionBuilding

AcceleratorR

oad

S3, n-tof,

Atomic Phys

PRELIMINARY

DESIR

50m

GANILPRELIMINARY

Marek Lewitowicz, GANIL 14/06/06

Operation of the accelerators:66 weeks today (3 beams)

120 weeks with SPIRAL 2(5 simultaneous beams)

Operation of GANIL with SPIRAL 2

3 simultaneous beams for nucl. phys.


Stable ion beams from LINAGRIB from non - fissile targets

RIB of fission fragments > 1012 fiss./s

RIB of fission fragments 1014 fiss./s

2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016

Phase 1>1012 fiss./s

Phase 2Goal: 1014 fiss./s

Buildingsconstruction

ReferenceProject

Def.

Safetyauthorisation

Constructionof LINAG

Reference planning and phases

Possible scenario

Reference Planning

Cost of the facility: 130M€

PRELIMINARY


SPIRAL2 « Scientific Objectives »

Final Version on Webwww.ganil.fr

to be printed soon

Thanks to all (>110) contributors


Spins&Shapes

Position ofdrip-lines

N=Z

rp-process

Heavy and Super Heavy Elements

r-process path

Haloes & Structures inthe Continuum

Equation of StateRole of Isospin

The scientific case of SPIRAL 2

Spins & Shapes

Neutrons for scienceAtomic & solid state physicsIsotope production

Shell structure far from stability

r-process path

Spins & Shapes

r-process path

Neutrons for science


Neutrons For Science at SPIRAL 2:”nTOF - like” facility

•Fission•Minor actinides, mainisotopes•Cross section•Neutron spectrum,multiplicity•Prompt fission gammas•Detailed A and Zdistributions•Delayed neutron yields andprecursor characteristics

•Scattering•Secondary neutron energyand angle differential crosssections•Inelastic scattering

•Fusion reactors•Astrophysics


SPIRAL 2 - Letters of intentGoals:

Assess the technical feasibility, space, infrastructure requirements andcost for experiments

Identify new equipment to be constructed Formalise collaborations of the SPIRAL 2 users Form a basis allowing to define priorities for the scientific programme

of SPIRAL 2

Procedure and schedule:1. Call for LoI - May 26th 2006 - Dead-line for LoI: October 2nd 20062. Evaluation of LoI by SAC + additional experts (if necessary) - October 19

& 20th 2006 will include oral presentations of all LoI3. Call for proposals aiming in construction of new detectors - 20074. Signature of MoU by collaborations constructing detectors in 2007-2008

RNB at GANIL - · PDF file14/06/06 M. Lewitowicz 1 GANIL/SPIRAL facility Recent highlights...

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