lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · energy...

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Lifetime measurements after multi-nucleon transfer reactions at VAMOS and LISE in GANIL J. Ljungvall (CEA IRFU/SPhNGANILCSNSM) for the E553 (and E551) collaboration(s) Lea Colloqia, Paris, 23-24 Nov. 2009

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Page 1: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

Lifetime measurements after multi-nucleon transferreactions at VAMOS and LISE in GANIL

J. Ljungvall (CEA IRFU/SPhN→GANIL→CSNSM)for the E553 (and E551) collaboration(s)

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 2: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

Scientific motivation(s)

Physics around Z=28, N=40

E553: Neutron-rich irons 62,64Fe - Z=26, N=34-38

f7/2 protons removed

Adding f5/2 neutrons

→ 1g9/2 ↓ 1f5/2 ↑→ Collectivity builds up

→ N=40 “quenched”

Recent work explains low 2+1 energies in 64Fe in pf restricted model

(N. Hoteling et al. PRC 74, 064313 (2006))... Some B(E2)’s willsort it out→Lifetimes

+ Shell Model AND Beyond Mean Field

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 3: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

Scientific motivation(s)

Physics around Z=28, N=40

E553: Neutron-rich irons 62,64Fe - Z=26, N=34-38

f7/2 protons removed

Adding f5/2 neutrons

→ 1g9/2 ↓ 1f5/2 ↑→ Collectivity builds up

→ N=40 “quenched”

Recent work explains low 2+1 energies in 64Fe in pf restricted model

(N. Hoteling et al. PRC 74, 064313 (2006))... Some B(E2)’s willsort it out→Lifetimes

+ Shell Model AND Beyond Mean Field

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 4: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

Scientific motivation(s)

Physics around Z=28, N=40

E553: Neutron-rich irons 62,64Fe - Z=26, N=34-38

f7/2 protons removed

Adding f5/2 neutrons

→ 1g9/2 ↓ 1f5/2 ↑→ Collectivity builds up

→ N=40 “quenched”

Recent work explains low 2+1 energies in 64Fe in pf restricted model

(N. Hoteling et al. PRC 74, 064313 (2006))... Some B(E2)’s willsort it out→Lifetimes

+ Shell Model AND Beyond Mean Field

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 5: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

Scientific motivation(s)

Physics around Z=28, N=40

E551: Reduction of the Z=28 gap - the other side of the coin

g9/2 neutrons added

→ 1πf5/2 ↓ 1πf7/2 ↑Z=28 reduced (...)

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 6: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

Scientific motivation(s)

Measure lifetimes of excited states in neutron-richnuclei using Recoil Distance Doppler Shift

Why (now)?

Complements Coulomb excitation measurements

RIB facilities coming up: Technical development

How?

1 Multi-nucleon transfer

2 Spectrometer

3 A Plunger+γ-ray spectrometer

E553:238U [email protected] MeV/A on 64Ni target

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 7: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

Scientific motivation(s)

Measure lifetimes of excited states in neutron-richnuclei using Recoil Distance Doppler Shift

Why (now)?

Complements Coulomb excitation measurements

RIB facilities coming up: Technical development

How?

1 Multi-nucleon transfer

2 Spectrometer

3 A Plunger+γ-ray spectrometer

E553:238U [email protected] MeV/A on 64Ni target

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 8: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

Scientific motivation(s)

Measure lifetimes of excited states in neutron-richnuclei using Recoil Distance Doppler Shift

Why (now)?

Complements Coulomb excitation measurements

RIB facilities coming up: Technical development

How?

1 Multi-nucleon transfer

2 Spectrometer

3 A Plunger+γ-ray spectrometer

E553:238U [email protected] MeV/A on 64Ni target

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 9: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E553: Experimental setup

VAMOS+EXOGAM+Plunger

Beam

Target

Degrader

VAMOS

EXOGAM

VAMOS gives

Identifcation

Velocity

Excitation energy

]° [Lab

Theta36 38 40 42 44 46 48 50 52 54

Kin

etic

en

erg

y [M

eV/A

]

4

4.5

5

5.5

6

6.5

7

7.5

8 Ex = 0 MeV

Ex = 20 MeV

Ex = 40 MeV

The real thing

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 10: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E553: Experimental setup

VAMOS+EXOGAM+Plunger

Beam

Target

Degrader

VAMOS

EXOGAM

Energy [keV]845 850 855 860 865 870 875 880 885 890

Co

un

ts/k

eV

0

20

40

60

80

100

120

]° [Lab

Theta36 38 40 42 44 46 48 50 52 54

Kin

etic

en

erg

y [M

eV/A

]

4

4.5

5

5.5

6

6.5

7

7.5

8 Ex = 0 MeV

Ex = 20 MeV

Ex = 40 MeV

The real thing

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 11: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E553: Experimental setup

VAMOS+EXOGAM+Plunger

Beam

Target

Degrader

VAMOS

EXOGAM

Energy [keV]845 850 855 860 865 870 875 880 885 890

Co

un

ts/k

eV

0

20

40

60

80

100

120

]° [Lab

Theta36 38 40 42 44 46 48 50 52 54

Kin

etic

en

erg

y [M

eV/A

]

4

4.5

5

5.5

6

6.5

7

7.5

8 Ex = 0 MeV

Ex = 20 MeV

Ex = 40 MeV

The real thing

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 12: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E553: Experimental setup

VAMOS+EXOGAM+Plunger

Beam

Target

Degrader

VAMOS

EXOGAM

Energy [keV]845 850 855 860 865 870 875 880 885 890

Co

un

ts/k

eV

0

20

40

60

80

100

120

]° [Lab

Theta36 38 40 42 44 46 48 50 52 54

Kin

etic

en

erg

y [M

eV/A

]

4

4.5

5

5.5

6

6.5

7

7.5

8 Ex = 0 MeV

Ex = 20 MeV

Ex = 40 MeV

The real thing

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 13: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E553: Experimental setup

VAMOS+EXOGAM+Plunger

Beam

Target

Degrader

VAMOS

EXOGAM

Energy [keV]845 850 855 860 865 870 875 880 885 890

Co

un

ts/k

eV

0

20

40

60

80

100

120

The real thing

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 14: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E553: Analysing the data

The gamma rays

60Fe

800 900 1000 1100 1200 13000

20

40

60

80

100

800 900 1000 1100 1200 13000

20

40

60

80

100

800 900 1000 1100 1200 13000

20

40

60

80

100

62Fe

850 900 950 1000 1050 1100 1150 1200 1250 13000

20

40

60

80

100

120

850 900 950 1000 1050 1100 1150 1200 1250 13000

20

40

60

80

100

120

850 900 950 1000 1050 1100 1150 1200 1250 13000

20

40

60

80

100

120

64Fe

700 750 800 850 900 950 10000

5

10

15

20

25

700 750 800 850 900 950 10000

5

10

15

20

25

700 750 800 850 900 950 10000

5

10

15

20

25

40 µm

250 µm

750 µm

Energy [keV]

2+ →0+

4+ →2+

2+ →0+

4+ →2+

2+ →0+

4+ →2+

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 15: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E553: Analysing the data

Decay curves

Normalisation

1 Intensity in 2+1 →0+

1

2 Number of ionsidentified in VAMOS

Consistent results from thetwo

Decay cruves 62,64Fe

50

100

150

200

250

300

350

400

450

500

0 100 200 300 400 500 600 700 800

Co

un

ts in

pe

ak

Distance [µm]

Iuij

62Fe 2

+->0

+

Iuij

62Fe 4

+->2

+

0

20

40

60

80

100

120

140

160

180

0 100 200 300 400 500 600 700 800

Co

un

ts in

pe

ak

Distance [µm]

Iuij

64Fe 2

+->0

+

Iuij

64Fe 4

+->2

+

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 16: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E553: Analysing the data

“...all the things you told me just to tell me later thatyou told me so...”

Questions analysing RDDS data after multinucleon transfer reactions

1 Angular distribution

The same for 2+1 and 4+

1 ?Reorientation effect?

2 Side feeding

What feeds the 2+1 states?

Problems from low statistics → No γγ. No experience to estimatethese effects, unlike after fusion-evaporation.

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 17: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E553: Analysing the data

“...all the things you told me just to tell me later thatyou told me so...”

Questions analysing RDDS data after multinucleon transfer reactions

1 Angular distribution

The same for 2+1 and 4+

1 ?Reorientation effect?

2 Side feeding

What feeds the 2+1 states?

Problems from low statistics → No γγ. No experience to estimatethese effects, unlike after fusion-evaporation.

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 18: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E553: Results

Some new lifetimes

A τ (ps) Eex (keV) B(E2; ↓) (e2fm4)This exp. NNDC exp. exp.

60 11(1) 12(2) 823.6 190(20)62 7.4(9) - 876.8 214(26)

64 7.4(26) - 746.4 470+210−110

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 19: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E553: Conclusions

Physics

Strong increase ofcollectivity

Systematics ok

We need pfgd space

0

100

200

300

400

500

600

700

52 54 56 58 60 62 64 66 68

B(E

2;2

+->

0+)

[e2fm

4]

Mass

From this experiment

From previous experiments

E. Caurier et al. SM pf

E. Caurier et al. SM pfgd

Girod et. al CGM(GOA)

500

600

700

800

900

1000

1100

1200

1300

1400

1500

52 54 56 58 60 62 64 66 68

E 2

+1 [

ke

V]

Mass

ExperimentE. Caurier et al. SM pf

E. Caurier et al. SM pfgdGirod et. al CGM(GOA)

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 20: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E553: Conclusions

Physics

Strong increase ofcollectivity

Systematics ok

We need pfgd space

0

0,1

0,2

0,3

0,4

B(E

2; 0

1+→

2 1+)

(e

2 b2 )

FeNiZnGeSe

26 28 30 32 34 36 38 40 42 44 46 48 50 52N

500

1000

1500

2000

E(2

+)

(k

eV)

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 21: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E553: Conclusions

Physics

Strong increase ofcollectivity

Systematics ok

We need pfgd space

0

100

200

300

400

500

600

700

52 54 56 58 60 62 64 66 68

B(E

2;2

+->

0+)

[e2fm

4]

Mass

From this experiment

From previous experiments

E. Caurier et al. SM pf

E. Caurier et al. SM pfgd

Girod et. al CGM(GOA)

500

600

700

800

900

1000

1100

1200

1300

1400

1500

52 54 56 58 60 62 64 66 68

E 2

+1 [

ke

V]

Mass

ExperimentE. Caurier et al. SM pf

E. Caurier et al. SM pfgdGirod et. al CGM(GOA)

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 22: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E553: Conclusions

Experimental technique

Works well!

Idenfication in VAMOS ok

Sufficient statistics in -2p+2n channel

No problems with elastic scattering of beam/target/degrader

What about 4+1 states?

In “our” irons τ4+1≈ 1ps↔35µm: Degrader distances chosen for the

2+1 states...

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 23: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E553: Conclusions

Experimental technique

Works well!

Idenfication in VAMOS ok

Sufficient statistics in -2p+2n channel

No problems with elastic scattering of beam/target/degrader

What about 4+1 states?

In “our” irons τ4+1≈ 1ps↔35µm: Degrader distances chosen for the

2+1 states...

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 24: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E553: Conclusions

“...come flooding back to me now.”The Magnetic Fields

...but what about our difficulties?

Angular distribution - seems ok...

Reorientation - seems ok...

Feeding - seems ok...

We need γγ to be sure. Missing factor 10 in statistics

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 25: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E553: Conclusions

“...come flooding back to me now.”The Magnetic Fields

...but what about our difficulties?

Angular distribution - seems ok...

Reorientation - seems ok...

Feeding - seems ok...

We need γγ to be sure. Missing factor 10 in statistics

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 26: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E551: Experiment

Experimental setup - LISE+EXOGAM+Plunger

Primary beam 76Ge 61 MeV/A

Secondary beam 74Zn

Secondary target CD2 34mg/cm2, degrader Be 54mg/cm2

Goal: 74Zn(d,3He)73Cu

Figures courtesy of Baptiste Mouginot IPN Orsay

No 73Cu seen. Studentin need of data - 74Zn

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 27: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E551: Experiment

Experimental setup - LISE+EXOGAM+Plunger

Primary beam 76Ge 61 MeV/A

Secondary beam 74Zn

Secondary target CD2 34mg/cm2, degrader Be 54mg/cm2

Goal: 74Zn(d,3He)73Cu

Figures courtesy of Baptiste Mouginot IPN Orsay

No 73Cu seen. Studentin need of data - 74Zn

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 28: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

E551: Online analysis

Some online spectra

0 mm

2.5 mm

3.5 mm

5 mm

2 cm

2+1 in 74Zn populated via

inelastic scattering

Excitation also on degrader

The student gets to work forhis degree!!!

Figures courtesy of Baptiste Mouginot IPN OrsayLea Colloqia, Paris, 23-24 Nov. 2009

Page 29: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

L’avenir

Next year

Reduced Transition probabilities in 68,70,72Ni by Recoil-Doppler-ShiftMethod

Spokespersons E. Clement, J.Ljungvall, and, I. Celikovic

70Ni B(E2,4+1→2+

1 ) and higher

Complex states - test of shell-modelB(E2,4+

1→2+1 )/B(E2,2+

1→0+1 ) allows IBM approach

72Ni B(E2,2+1→0+

1 )

Polarisation 68Ni coreorbital ordering - tensor force νg9/2-πf7/2/πf5/2

A VAMOS+EXOGAM+Plunger experiment!!!

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 30: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

L’avenir

Next year

Reduced Transition probabilities in 68,70,72Ni by Recoil-Doppler-ShiftMethod

Spokespersons E. Clement, J.Ljungvall, and, I. Celikovic

70Ni B(E2,4+1→2+

1 ) and higher

Complex states - test of shell-modelB(E2,4+

1→2+1 )/B(E2,2+

1→0+1 ) allows IBM approach

72Ni B(E2,2+1→0+

1 )

Polarisation 68Ni coreorbital ordering - tensor force νg9/2-πf7/2/πf5/2

A VAMOS+EXOGAM+Plunger experiment!!!

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 31: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

L’avenir

AGATA on tour

(some of the) Physics we will try todo

Weakening of N=50, Z=28shells...

Nuclear shapes neutron richA≈100

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 32: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

L’avenir

AGATA on tour

(some of the) Physics we will try todo

Weakening of N=50, Z=28shells...

Nuclear shapes neutron richA≈100

Tool we will use

High-intensity radioactivebeams

AGATA (EXOGAM2)

PRISMA/VAMOS (LISE)

RDDS

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 33: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

L’avenir

AGATA on tour

AGATA vs. EXOGAM

Beam

Target

Degrader

Focusing element

Bρ separation

M,Z determination

γ-ray

detec

tors

EXOGAMVAMOS -ray energy [keV]γ

600 700 800 900 1000 1100 1200

γ-γ

0

20

40

60

80

100

120

140

160

180

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 34: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

L’avenir

AGATA on tour

AGATA vs. EXOGAM

Beam

Target

Degrader

Focusing element

Bρ separation

M,Z determination

γ-ray

detec

tors

AGATA dem.VAMOS -ray energy [keV]γ

600 700 800 900 1000 1100 1200

γ-γ

0

20

40

60

80

100

120

140

160

180

pxEntries 1339650Mean 769.6RMS 500.4

200 400 600 800 1000 1200 1400 1600 1800 20000

200

400

600

800

1000

1200

1400

pxEntries 1339650Mean 769.6RMS 500.4

gg g4pEntries 15802Mean 762.3RMS 497.6

Total projection

50*(Gate on 4+->2+)

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 35: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

Ending titles

Declarations of dependance

Presented by J. Ljungvall but made possible by theE553 and E551

collaborations

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 36: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

Extras

“...come flooding back to me now.”The Magnetic Fields

...but what about our difficulties?

Angular distribution - seems ok...

Reorientation - seems ok...

Feeding - seems ok...

We need γγ to be sure. Missing factor 10 in statistics

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 37: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

Extras

“...come flooding back to me now.”The Magnetic Fields

...but what about our difficulties?

Angular distribution - seems ok...

Reorientation - seems ok...

Feeding - seems ok...

]°Phi [-150 -100 -50 0 50 100 150

]°T

het

a [

0

20

40

60

80

100

120

140

160

180 bkg subtractedRaw Number of counts at angle for 2+,

bkg subtractedRaw Number of counts at angle for 4+,

We need γγ to be sure. Missing factor 10 in statistics

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 38: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

Extras

“...come flooding back to me now.”The Magnetic Fields

...but what about our difficulties?

Angular distribution - seems ok...

Reorientation - seems ok...

Feeding - seems ok...

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

0 100 200 300 400 500 600 700 800

Is 2+/Is 4+

Distance [µm]

60Fe

Is2+/Is4+ θ=135-150

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

2.2

0 100 200 300 400 500 600 700 800

Is 2+/Is 4+

Distance [µm]

60Fe

Is2+/Is4+ θ=135-150Is2+/Is4+ θ=160-180

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

2.2

0 100 200 300 400 500 600 700 800

Is 2+/Is 4+

Distance [µm]

60Fe

Is2+/Is4+ θ=135-150Is2+/Is4+ θ=160-180

0.6

0.8

1

1.2

1.4

1.6

1.8

2

2.2

2.4

0 100 200 300 400 500 600 700 800

Is 142/

Is 170

Distance [µm]

60Fe

2+

0.6

0.8

1

1.2

1.4

1.6

1.8

2

2.2

2.4

0 100 200 300 400 500 600 700 800

Is 142/

Is 170

Distance [µm]

60Fe

2+

4+

0.6

0.8

1

1.2

1.4

1.6

1.8

2

2.2

2.4

0 100 200 300 400 500 600 700 800

Is 142/

Is 170

Distance [µm]

60Fe

2+

4+

We need γγ to be sure. Missing factor 10 in statistics

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 39: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

Extras

“...come flooding back to me now.”The Magnetic Fields

...but what about our difficulties?

Angular distribution - seems ok...

Reorientation - seems ok...

Feeding - seems ok...

]°LAB Angle [36 38 40 42 44 46 48 50 52

Kin

etic

En

erg

y [M

eV/A

]

3.5

4

4.5

5

5.5

6

6.5

7

7.5

EnergyIncreasing Exictation

We need γγ to be sure. Missing factor 10 in statistics

Lea Colloqia, Paris, 23-24 Nov. 2009

Page 40: Lifetime measurements after multi-nucleon transfer ...lea-colliga/public-docs/2009... · Energy [keV] 845 850 855 860 865 870 875 880 885 890 Counts/keV 120 100 80 60 40 20 0] °

Extras

“...come flooding back to me now.”The Magnetic Fields

...but what about our difficulties?

Angular distribution - seems ok...

Reorientation - seems ok...

Feeding - seems ok...

We need γγ to be sure. Missing factor 10 in statistics

Lea Colloqia, Paris, 23-24 Nov. 2009