The LaSpec project

At FAIR…

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140

10

20

30

40

50

60

70

80

90

N

Z0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

9,000

10,00

11,00

12,00Laser Spectroscopy

Log Production Yield

Cheapest(?),Fully destripped…

Still cooled:

TDR available…

Final layout…

MATS

LaSpec

RFQ mass

separation

Ions

Ato

ms

gas catcher / inverse cyclotron

Ions from Super-FRS

13 m

10 m

210 m²

LaSpec

laser l

ab

55 m²

annex building 6b--second floor--

MATS

lab

W. Nörtershäuser et al., Hyperfine Interactions 171 (2006)

Previous “final” layout…

*

*

*

Ground State Properties

Isotope Shift (IS) Hyperfine Structure (HFS)

AAr

2

Nuclear Spin IMagnetic Dipole Moment I

Electric Quadrupole Moment Qs

Hyperfine Anomaly

Mean Square Charge Radii

K

Cu

Na

Na

Wavelength ~ 589 – 590 nm

Na

Fine structure

at part per

thousand level

Now excite the transition with a laser...

Super zoom....line ~1015

Hz

Ground State Properties

MODEL INDEPENDENT

ISOLATED STATE

J, magnetic moment,Qs,<r2>

At FAIR…

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140

10

20

30

40

50

60

70

80

90

N

Z0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

9,000

10,00

11,00

12,00Laser Spectroscopy

Log Production Yield

To the very neutron rich…

..to find?

..with what signature?

(..using an EM probe to explore neutral particles?)

Aufmuth et al. ADNDT 37 (1987) 3

N

Samarium

Interpreting?

S2n(N,Z) = B(N,Z) – B(N – 2,Z)

Discontinuity of S2n observed for Sr-Rb isotopes at N=60

S2n(N,Z) = B(N,Z) – B(N – 2,Z)

Discontinuity of S2n observed for Sr-Rb isotopes at N=60

Rb

Sr

Y

ZrNb

Mo

KrThe NEW mass and

charge radii data...

NOW we’re consistent...

(also, <r2> never wrong...)

(like a geophysical survey...)

Laser Spectroscopy at the LEB

next door to MATS...

RFQ

Spectroscopy

7 T superconducting solenoid @ 30 kV:Purification trap (M/M < 10-5):Precision trap (M/M < 10-6):

V. Kolhinen et al., NIM A 528 (2004) 776 S. Rinta-Antila et al., PRC 70 (2004) 011301(R)A. Jokinen et al., IJMS 251 (2006) 241

1064700 1064750 1064800 1064850 1064900

0

200

400

600

800

1000

1200

1400

FWHM = 20 HzM/M = 145 000

101Y

101Zr

101Nb

101Mo

Co

un

ts

Frequency [Hz]

833545 833550 833555 833560 833565

260

280

300

320

340

360

380

129Xe

f: 833555.688(5) Hz

p: 4 x 10-6 mbarAxial E: 0.4467(25) eV(): 1.026(29) mm(): 0.025(13) mmPhase: 3.15(11) radTime: 387(4) msAmplitude: 18.1(8) mV

Tim

e-o

f-fli

gh

t [s

]

Excitation frequency [Hz]

Bm

qfc

2

1

e

e

mmmm

f

f

--

=refc

refc,

K130-accelerator + IGISOL: Mass-separated 1+ DC ion

beam at 30 keV of all elements.

Both need stopped beam…

Beam cooler ~100eV

Fragment stopper GeV

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140

10

20

30

40

50

60

70

80

90

N

Z0

1,0002,000

3,000

4,0005,000

6,000

7,000

8,0009,000

10,00

11,0012,00Laser Spectroscopy

Log Production Yield

ß-NMR

LD-RIS+ν tag

Coincidence and decaytagged atom/ion spec.

LD-RISBunched beamspectroscopy

At FAIR…

The IGISOLfacility, JYFL Frequency (MHz)

102

101

100

99

98

96

94

93

92

95

97

50 – 5000ions per sec

To the very neutron rich…

..to find?

..with what signature?

..using an EM probe to explore neutral particles?

To date;

All shell closures,Sub-shell closures,N=88,Zr region,Octupole regions,Shape coexistence,

Haloes??

NB: Qs 9Li ~ Qs 11Li !!

Sanchez et al. PRL 96 03002 (2006)

8Li 20945.89Li 24954.9

11Li 40728.3

Protons andneutrons…

Just theprotons…

For the future...

Guenaut et al. J.Phys.G 31 (2005) S1765

Baldrick...

Guenaut et al. J.Phys.G 31 (2005) S1765

Final layout…

1960

1980

1990

2000

2009

2015?

The IGISOLfacility, JYFL Frequency (MHz)

102

101

100

99

98

96

94

93

92

95

97

50 – 5000ions per sec

Pumping in the cooler:

Niobium (improved, cw)

+0.03

Summary:

Plenty of atomic concerns but all fornuclear spectroscopy...

....and all ready to go

F Charlwood

K Baczynska

T Eronen

University of Manchester

University of Birmingham

University of Jyvaskyla

Data from…

Thanks…

I=0 I≠0 ProlateFrequency (MHz)

102

101

100

99

98

96

94

93

92

Decreasingly strong prolate

Yttrium J=0 – J’=1 (363nm)

Increasingly oblate

95

97

Hyperfine anomaly (Ta)

Differential anomaly of ~ 1% detected in both lower states;

Distribution of nuclear magnetisation haschanged (by a huge amount, nb Moskowitz-Lombardi)

2

2

Hyperfine anomaly: Ta

Hafnium charge radii

180Ta 181Ta

Measure the 180Ta ground

state anomaly

… matter radii

Hyperfine anomaly: Lu

Georg et al. Eur Phys J A3 (1998) 225

Au/Al

mass