Post on 06-Jan-2016
description
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