Title page

Title pageJ Van de Walle1, I. Stefanescu1, P Mayet1, O Ivanov1, F Aksouh1, D Smirnov1, JC Thomas1, R Raabe1,

M Huyse1, P Van Duppen1

1 IKS KULeuven Belgium

O Niedermaier2, M Lauer2, V Bildstein2, H Scheit2, D Schwalm2, N Warr3, D Weisshaar3, J Eberth3, M Pantea4, G Schrieder4, O Kester5, F Ames5, T Sieber5, S Emhofer5, B Wolf5, R Lutter5, D Habs5, P Butler6, J Cederkall6, P Delahaye6, S Franchoo6, Y Kojima6, U Koster6, T Nilsson6, F Wenander6, J Iwanicki7, A Hurst7, F Azaiez8, F Ibrahim8, O Perru8, M Stanoiu8, O Sorlin8, D Verney9, Th Behrens10, Th Kroll10, R Krucken10, G Sletten11, the MINIBALL collaboration and the REX-ISOLDE collaboration

2 Max Planck Institut fur Kernphysik Heidelberg Germany 3 Institut fur Kernphysik Universitat Koln Germany

4 TU Darmstadt Germany 5 LMU Munchen Germany

6 CERN Switserland 7 University of Liverpool Great Britain

8 IPN Orsay France 9 GANIL Caen France

10 TU Munchen Germany 11 Neils Bohr Institute Roskilde Denmark

Coulomb Excitation of Neutron Rich Zn Isotopes

Phys Mot (Chart)

N=40, 50

Z=28

78Ni

Physics MotivationPhysics MotivationExperimental SetupExperimental Results

74,76,78Zn (Z=30)

Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle

g9/2

Phys Mot (Ni)

Physics Motivation : NiPhysics MotivationExperimental SetupExperimental Results


Langanke et al, PRC 67, 2003 Sorlin et al, PRL 88, 2002Broda et al, PRL 74, 1995Z=28 N=28...40

28

40

p3/2

f5/2

p1/2

g9/2

28

40

p3/2

f5/2

p1/2

50 50

f7/2

20 20

protons neutrons

f7/2

28 40

Ni isotopes

68Ni

Phys Mot (Zn)

Physics Motivation : ZnPhysics MotivationExperimental SetupExperimental Results


Leenhardt et al, EPJA 14, 2002

Z=28 N=28...40

28

40

p3/2

f5/2

p1/2

g9/2

28

40

p3/2

f5/2

p1/2

50 50

f7/2

20 20

protons neutrons

f7/2

28 40

Ni isotopesZn isotopes

“Onset of Deformation”1-Additional protons outside N=282-Neutron pairing interactions maximal at N=40

g9/2

Ganil, intermediate energy coulex

72Zn

RIKENIntermediate energy coulex

Phys Mot (Ge)

Physics Motivation : GePhysics MotivationExperimental SetupExperimental Results


Z=28 N=28...40

28

40

p3/2

f5/2

p1/2

g9/2

28

40

p3/2

f5/2

p1/2

50 50

f7/2

20 20

protons neutrons

f7/2

28 40

Ni isotopesZn isotopesGe isotopes

Iwasaki et al, private communication

g9/2

50

Oak RidgeLow energy coulex

82Ge

?

Padilla-Rodal et al, PRL 94 122501 (2005)

Exp Setup 1


Experimental Setup : REX-Isolde

Physics MotivationExperimental Setup Experimental Results

since 2001 :

30Mg ( PRL 94, 172501 (2005) ) 32Mg74,76,78Zn

110Sn (poster A. Ekström)122,124Cd

70Se84,86,88Kr

REX-Isolde + "Miniball"

* selective : laser* efficient* fast

Exp Setup 1bis


Experimental Setup : REX-Isolde 1/5


1. Target : UCx (74Zn,76Zn) + neutron converter (78Zn)

Exp Setup 21. Target : UCx (74Zn,76Zn) + neutron converter (78Zn)




2. Laser Ionization of Zn (RILIS) + Mass separation (GPS)

Exp Setup 3



3. Bunching (REXTrap) + Charge Breeding (EBIS)




Exp Setup 41. Target : UCx (74Zn,76Zn) + neutron converter (78Zn)



4. Post Acceleration : ~2.87 MeV/u




Exp Setup 5





5. Coulomb Excitation : Miniball + DSSD




Exp Setup 5 bis





5. Coulomb Excitation : Miniball + DSSD




! selectiv

e

!

Exp Setup Contam

E

E

without n-converter

78Ga78Zn

E

with n-converter

78Ga78Zn

78Rb

Ibeam,Zn/Itotal 50%

78Zn78Zn + 78Ga + 78Rb

Experimental Setup : Beam Contamination 1



Exp Setup Contam78Zn = laser ionization78Ga = surface ionization

Experimental Setup : Beam Contamination 2



laser ONlaser OFF

1. particle spectrum

3. -decay intensities (laser ON)

2. particle count rate (laser ON/OFF)

Exp Res 74 (1)

0+

2+

4+

2+

606.01(5)

1418.6(1)

74Zn

Experimental Results : 74Zn



74Zn beam on 120Sn target (2.3 mg/cm2 - 2.87 MeV/u)

12.5h ~4E6 parts/sec on target

Exp Res particles

76Zn + 76Ga

120Sn

Strip Number

Experimental Results : particle spectrum



target

beam


12.5h ~4E6 parts/sec on target

Exp Res 74 (2)

Experimental Results : 74Zn coulex



: 2+0+ doppler corrected

Exp Res 76 (1)Experimental Results : 76Zn coulex




14.5h ~1.3E6 parts/sec on target

Exp Res 76 (2)Experimental Results : 76Zn coulex





76Zn: 2+0+ doppler corrected

76Ga

Exp Res 78 (1)




78Zn beam on 108Pd target (2.0 mg/cm2 - 2.86 MeV/u)


78Zn

0+

2+

(4+)

(6+)

(8+)

73

08

91

2+ state in 78Zn: fixed

Exp Res 78 (2)




78Zn beam on 108Pd target (2.0 mg/cm2 - 2.86 MeV/u)


doppler corrected

Exp Res theory

Experimental Results : coulex theory



7474

AMiniball,Zn in,2 0 E2, ZnZn

dNN . . I

A

120120

AMiniball,Sn in,2 0 E2, SnSn

dNN . . I

A

,Zn

,Zn+Ga

CalculateSpectrum

Calculate with B(E2)

Laser On/Off

74

74 120

120

,2 0Miniball,Sn ZnE2, Zn E2, Sn

Miniball,Zn,2 0 Sn

N. .

N

Iin,Zn

Iin,Zn+Ga

x

First order perturbation theory :Alder & Winther : "Electromagnetic Excitation - Theory of Coulomb Excitation with Heavy Ions"North-Holland, 1975, Amsterdam

Exp Res BE2

Experimental Results + Shell Model theory



: theoretical B(E2)-valuesf,p,g - valence space beyond 56Ni core : ANTOINE shell model code

(N. Smirnova - University Gent)

ConclCoulex of 74,76,78Zn :

° fixed 2+ in 78Zn° preliminary B(E2) values° systematic errors "understood"

Conclusion + OutlookPhysics MotivationExperimental Setup Experimental Results


July 2005 :

° 5-8th july : coulex of 68,70Ni (!) ° 13-18th july : coulex of 70Cu isomeres (!)

late 2005° re-measuring 78Zn + 80Zn

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