The science programme at ISOLDE

Karsten RiisagerDept. of Physics and Astronomy

University of Aarhus

Facility for isotope production

• Energy range 10-6 eV (10 mK) to 3 MeV/u• Intensity 1 – 1010 ions/s• Isotope range 6He to 232Ra (Z: 2-88, N:4-144)

Motivation (a reminder…)

• Nuclear physics (incl. applications) thrives on variety

• Intrinsic many-particle structure (2 fermions !)– multitude of quantum states, a rich variety of

phenomena– finite # particles, structure still varies rapidly

• Progress needed on many fronts– need different experimental techniques– need many isotopes

ISOLDE (2008)

ISOLDE: a unique facility

• Ideal driver beam for ISOL

• Variety of beams: leading laboratory for developments in – target/ion-sources– ion beam manipulation– experimental set-ups

• Strong users community

Research with slow Radioactive Ion Beams

Nuclear PhysicsNuclear Decay

Spectroscopy and Reactions

Structure of NucleiExotic Decay Modes

Atomic Methods

Laser Spectroscopy and Direct Mass MeasurementsRadii, Moments, Nuclear Binding

Energies

Nuclear Astrophysics

Dedicated Nuclear Decay/Reaction Studies

Element Synthesis, Solar Processes

f(N,Z)

Fundamental Physics

Direct Mass Measurements, Dedicated Decay Studies - WICKM unitarity tests, search for - correlations, right-handed

currents

Applied Physics

Implanted Radioactive Probes, Tailored Isotopes

for Diagnosis and Therapy

Condensed matter physics and Life sciences

Examples of research themes

• Nuclear Physics (abstract ID number)– shell closures shape evolution (6,31,74) shape

coexistence (18,33,62) halo nuclei (96)…

• Fundamental interactions– P, T violation (45) neutrinos (59,66) Vud (69)

• Solid state physics– semiconductors spintronics (64) nano… (88)

• Biophysics, medical physics– radioisotopes (44) heavy metal toxicity

Iranzo et al. Chem. Eur. J., 2007, 13:9178

De novo designed heavy metalion binding proteins

IS448

Determination of lattice positionsDetermination of lattice positionsECSLI Mn beam time:

emission channeling patterns from 61Co in GaN

• 61Mn implanted (~1013 cm2)• wait 25 min + anneal at 800°C• emission channeling patterns measured

from 61Co particles • fit results:

61Co on substitutional Ga sites

-2

-1

0

1

2

-2 -1 0 1 2

(0110)

experiment

-2 -1 0 1 2

1.46 - 1.54 1.38 - 1.46 1.30 - 1.38 1.23 - 1.30 1.15 - 1.23 1.07 - 1.15 0.99 - 1.07 0.92 - 0.99

simulation SGa sites

[0001]

-1

0

1

2

3(2021)

(1120)

1.43 - 1.50 1.36 - 1.43 1.29 - 1.36 1.22 - 1.29 1.15 - 1.22 1.08 - 1.15 1.01 - 1.08 0.94 - 1.01

[1102]

-1

0

1

2

3(1011)

(1120)

1.45 - 1.52 1.38 - 1.45 1.30 - 1.38 1.23 - 1.30 1.16 - 1.23 1.08 - 1.16 1.01 - 1.08 0.94 - 1.01

[1101]

[deg]-2 -1 0 1 2

-1

0

1

2

3

(0110)

(1120)

-2 -1 0 1 2

[2113] 1.40 - 1.47 1.34 - 1.40 1.27 - 1.34 1.20 - 1.27 1.14 - 1.20 1.07 - 1.14 1.00 - 1.07 0.94 - 1.00

IS453

“Island of inversion”

An example: 30-33Mg• Magnetic moments 31,33Mg, COLLAPS Yordanov et al, PRL 99 (2007) 212501

Kowalska et al PRC77 (2008) 034307

NMR 33Mg, MgO

μ = -0.7456 (5)μN

Spin 3/2

2p2h g.s.(intruder)

IS427

An example: 30-33Mg

• Coulex of 30,32Mg and 31Mg – Reiter et al Niedermaier et al, PRL 94 (2005) 172501

32Mg

107Ag

IS410

An example: 30-33Mg

• 2nd 0+ in 30Mg at 1788 keV, weak mixing – Schwerdtfeger, Thirolf et al, arXiv:0808.0264

More results: H. Mach et al.

IS414

An example: 30-33Mg

• 2nd 0+ in 30Mg at 1788 keV, weak mixing – Schwerdtfeger, Thirolf et al, arXiv:0808.0264

• Coulex of (30,32Mg and) 31Mg – Reiter et al (Niedermaier et al, PRL 94 (2005) 172501)

• Transfer d(30Mg,31Mg)p, (t,p)… – Bildstein et al

• Magnetic moments 31,33Mg, COLLAPS – Yordanov et al, PRL 99 (2007) 212501; Kowalska et al PRC77 (2008) 034307

• Masses, MISTRAL – Lunney et al, Eur. Phys. J. A28 (2006) 129

• Level lifetimes – Mach et al, Eur. Phys. J. A25 (2005) 105

• Radii, beta-decay studies,...

ISOLTRAP: 80-81Zn

z0

r0

Bm

qc

2

1 N=50 still robust shell

at Z=30

Neutron separation energy (MeV) versus NIS413

S. Baruah et al, PRL 101 (2008) 262501

Proton NumberNeutron Number

Ni

Zn

Ge

N=50 isotones

B(E

2,2

+1

0+

1)

[W.u

.]E(2

+1)

[keV

]

B(E

2,2

+1

0+

1)

[W.u

.]E(2

+1)

[keV

]

Ni,Zn,Ge isotopes

REX – Coulex: agree J. Van De Walle et al, PRL 99 (2007) 142501

IS412

Halo nuclei

11Li

11Be10Be+n

9Be+2n

8Be+3n

8Li+t

20.551

0.320 0.501

7.313

8.979

17.913

15.718

(MeV)

3/2-

10.59

8.82

Open delayed-particle channels in the 11Li beta decay

Open delayed-particle channels in the 11Li beta decay

1966

1974

1979

1980

1983

1996

9Li+d

IS417

7.914

6He+4He+n

Multi charged-particle branch11Li

IS417

Kinematic identification of(beta-delayed) decay branches: 4He + 7He 3H + 8Li etc

Selecting one channel revealsnew level at 16.3 MeV

M. Madurga et al,submitted to PLB

Lip)Li,d( 109Lip)Li,d( 109

2.77 MeV/u

IS367

Probing unbound 10Li

10Li

11Li

287 MeV/u

FRS-ALADIN-LAND@GSI

7 8 9 10 112.3

2.4

2.5

2.6

2.7

Nuc

lear

Cha

rge

Rad

ius

(fm

)

Be Isotope

Charge radius of Be isotopesCharge radius of Be isotopes

Preliminary

ServoDye Laser

(Anticollinear)

Be+ Beam

Shaping Optics

Photomultiplier

Rb Clock

Frequency

Comb

Retardation

Signal

I2

Servo

Deflector

Dye Laser

(Collinear)Doubler

Doublerbeamblocker

beamblocker

Laser Spectroscopy of Highly Charged Ions and Exotic Radioactive Nuclei

(VH-NG-148 Helmholtz Young Investigators Group)

IS449 W. Noertershaeuser, PRL 102 (2009) 062503

The beta-decay of 12B

00+

0,2+

0+

10.3

7.6542

12.71 1+

15.11 1+

7.275

4.4389 2+

threshold

0.9722

0.013

0.015

0.0008

12B 1+

Not observed

Hans Fynbo, Christian Diget et al.,Nature 433 (2005) 136

12C

Beta-decay to levels in 12C ― select decays through 8Be(0+)― R-matrix analysis

12C

IS404

ISOLDE Jyväskylä

The triple-alpha reaction rate

C. Diget, H. FynboIS404

Thanks to:

The ISOLDE Physics Group The ISOLDE Technical Group The ISOLDE Collaboration

Hans Fynbo Lars Hemmingsen Alexander Herlert Mark Huyse Björn Jonson Magdalena Kowalska Miguel Madurga Peter Reiter Piet Van Duppen

Existing program needsupgrades of:Beam “quality”IntensityEnergy