ECT* - The interplay between atomic and nuclear physics, Trento 2015

Laser Spectroscopy of 100-130Cd:Simple Trends in Complex Nuclei

D. T. Yordanov for the COLLAPS collaboration

ECT* - The interplay between atomic and nuclear physics, Trento 2015

The Shell Model

1s

1p

1d2s

1f

2p

1s

1p3/2

1p1/2

1d5/2

2s1d3/2

1f7/2

2p3/2

1f5/2

2p1/2

1g9/2

2

4

2

624

8

46210

2

8

20

50

28

Nuclear chart

Li

Be

Na

CuGa

Ne

Halo nuclei

Island of inversionMg

Monopole migration

K

Magicity

Ca

21st century laser spectroscopyat ISOLDE/CERN

Zn

Mn

2

2 8

20

28

50

8

20

28

50

82

Z

N

ECT* - The interplay between atomic and nuclear physics, Trento 2015

2

2 8

20

28

50

8

20

28

50

82

Z

N

21st century laser spectroscopyat ISOLDE/CERN

1g

2d

3s

1h

1g9/2

1g7/2

2d5/2

2d3/2

3s1/2

1h11/2

1h9/2

50

5864

687082

92

50

82

Cd

The Shell Model

Nuclear chart

RILIS

COLLAPS

ISCOOL

HRS

GPS

p+

ECT* 2015 Curtesy of M. Stachura

ECT* 2015

132Sn100Sn

rp process r process• more accurate theoretical lifetimes of the N=82 isotones below 129Ag• shell quenching vs. deformation• shell effect in the radii

Survey of ground-state properties in the Sn regionground and isomeric state properties of 100-130Cd

Physics case - Cd

ECT* - The interplay between atomic and nuclear physics, Trento 2015

Fast-beam fluorescence

Atomic work

5s2 1S0

5s5p 3P0 5s5p 3P1

5s5p 3P2

5s6s 3S1

326 nm, 7×105 s-1

468 nm, 1×10 7 s -1

480 nm, 3.8×10 7 s -1

509 nm, 5×10 7 s -1

Cd atom

1.) ion beam;2.) laser;3.) deflection plates;4.) post acceleration and charge exchange;5.) optical detection

ECT* - The interplay between atomic and nuclear physics, Trento 2015

Nadja Frömmgen et al., Eur. Phys. J. D, 69, 164 (2015)

Atomic work

Example: hfs of 119Cd

ECT* - The interplay between atomic and nuclear physics, Trento 2015

Nadja Frömmgen et al., Eur. Phys. J. D, 69, 164 (2015)

Atomic work

Critical input from atomic theory: EFG

ECT* - The interplay between atomic and nuclear physics, Trento 2015

accumulation

release

T1

T2 ≈ T1 / 104

ISCOOL - ISOLDE RFQCB

5s 2S1/2227 nm

, 3×10 8 s -1

5p 2P3/2

5p 2P1/2

215

nm, 2

.8×1

08 s

-1

D1 D2

Cd ion

Work in the Cd ion

Bunched-beam fluorescence

Laser system for 215nm

860 nm

430 nm

215 nm

ECT* 2015

215 n

m, 2.8

×10

8 s

-1

5s 2S1/2

5p 2P3/2

D2

Cd ion

ECT* - The interplay between atomic and nuclear physics, Trento 2015

Hfs of 119Cd

Phys. Rev. Lett., 110, 192501 (2013)

Results & Interpretation

ECT* - The interplay between atomic and nuclear physics, Trento 2015

Discovery of long-lived isomeric states in 127, 129Cd

Phys. Rev. Lett., 110, 192501 (2013)

Results & Interpretation

ECT* - The interplay between atomic and nuclear physics, Trento 2015Phys. Rev. Lett., 110, 192501 (2013)

Discovery of long-lived isomeric states in 127, 129Cd

Results & Interpretation

ECT* - The interplay between atomic and nuclear physics, Trento 2015

h11/2

‹j n|Q|j n› = ‹j|Q|j›2j+1-2n

2j-1

3/2 +

11/2 - states: extreme shell-model view

Phys. Rev. Lett., 110, 192501 (2013)

Results & Interpretation

ECT* - The interplay between atomic and nuclear physics, Trento 2015

h11/2

‹j n|Q|j n› = ‹j|Q|j›2j+1-2n

2j-13/2 +

11/2 - states: extreme shell-model view

Phys. Rev. Lett., 110, 192501 (2013)

n = 1 + p (A - n0), p = 5/9, n0 = 111free parameters:‹j|Q|j› = Qsp = -667(31) mbQcore = -85(8) mbeffective charge:en = 2.5 e

Qcore

Results & Interpretation

ECT* - The interplay between atomic and nuclear physics, Trento 2015Phys. Rev. Lett., 110, 192501 (2013)

h11/2

3/2 +

1/2 +

11/2 - states: extreme shell-model view

Results & Interpretation

ECT* - The interplay between atomic and nuclear physics, Trento 2015

Charge radii: PRELIMINARY‹r

2 ›1/

2 (fm

)

Results & Interpretation

Michael Hammen, PhD thesis, University of MainzTrend reproduced: HFB - HFODD/UNEDF1 by N. Nikolov

ECT* - The interplay between atomic and nuclear physics, Trento 2015

Isomer vs. ground state: PRELIMINARY

Results & Interpretation

ECT* - The interplay between atomic and nuclear physics, Trento 2015

IAP

Summary

• Measured model independent I, m, Q and ‹r2› of 100-130Cd

• First direct observation of long-lived isomers in 127, 129Cd

• Linear behavior of the h11/2 Q moments in 111-129Cd

• Core polarization from magnetic moments

• Parabolic behavior of the differential ms charge radii

Collinear Laser Spectroscopy @ ISOLDE

EURORIB’15

Electron linac - 10 mA, 50 MeV

238U-carbide target & ion source5 × 1011 photofissions / s

Mass separator LINO

ECT* 2015

132Sn100Sn

rp process

Laser spectroscopy of silver and indium at ALTO

r process

LINO - Laser Induced Nuclear Orientation at ALTO

ECT* 2015

LINO - Laser Induced Nuclear Orientation at ALTO

Phase I:111-120Ag

Phase II:121-126Ag

chargeexchange

gastarget

Phase III:121-126Ag

ECT* 2015

Sketch of a possible layout for b - delayed ( )g n detection

b scintillation detectors g scintillation detectors

HPGe

magnet & implantation crystal

polarizedbeam

LINO - Laser Induced Nuclear Orientation at ALTO

ECT* 2015

g

b -

n

Sketch of a possible layout for b - delayed ( )g n detection

LINO - Laser Induced Nuclear Orientation at ALTO

ECT* 2015

LINO - Laser Induced Nuclear Orientation at ALTO

Thanks for listening !