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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
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
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
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
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
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
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
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
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
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
Experimental Setup : REX-Isolde 1/5
Physics MotivationExperimental Setup Experimental Results
1. Target : UCx (74Zn,76Zn) + neutron converter (78Zn)
Exp Setup 21. Target : UCx (74Zn,76Zn) + neutron converter (78Zn)
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
Experimental Setup : REX-Isolde 2/5
Physics MotivationExperimental Setup Experimental Results
2. Laser Ionization of Zn (RILIS) + Mass separation (GPS)
Exp Setup 3
1. Target : UCx (74Zn,76Zn) + neutron converter (78Zn)
2. Laser Ionization of Zn (RILIS) + Mass separation (GPS)
3. Bunching (REXTrap) + Charge Breeding (EBIS)
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
Experimental Setup : REX-Isolde 3/5
Physics MotivationExperimental Setup Experimental Results
Exp Setup 41. Target : UCx (74Zn,76Zn) + neutron converter (78Zn)
2. Laser Ionization of Zn (RILIS) + Mass separation (GPS)
3. Bunching (REXTrap) + Charge Breeding (EBIS)
4. Post Acceleration : ~2.87 MeV/u
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
Experimental Setup : REX-Isolde 4/5
Physics MotivationExperimental Setup Experimental Results
Exp Setup 5
1. Target : UCx (74Zn,76Zn) + neutron converter (78Zn)
2. Laser Ionization of Zn (RILIS) + Mass separation (GPS)
3. Bunching (REXTrap) + Charge Breeding (EBIS)
4. Post Acceleration : ~2.87 MeV/u
5. Coulomb Excitation : Miniball + DSSD
Experimental Setup : REX-Isolde 5/5
Physics MotivationExperimental Setup Experimental Results
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
Exp Setup 5 bis
1. Target : UCx (74Zn,76Zn) + neutron converter (78Zn)
2. Laser Ionization of Zn (RILIS) + Mass separation (GPS)
3. Bunching (REXTrap) + Charge Breeding (EBIS)
4. Post Acceleration : ~2.87 MeV/u
5. Coulomb Excitation : Miniball + DSSD
Experimental Setup : REX-Isolde 5/5
Physics MotivationExperimental Setup Experimental Results
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
! 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
Physics MotivationExperimental Setup Experimental Results
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
Exp Setup Contam78Zn = laser ionization78Ga = surface ionization
Experimental Setup : Beam Contamination 2
Physics MotivationExperimental Setup Experimental Results
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
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
Physics MotivationExperimental Setup Experimental Results
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
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
Physics MotivationExperimental Setup Experimental Results
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
target
beam
74Zn beam on 120Sn target (2.3 mg/cm2 - 2.87 MeV/u)
12.5h ~4E6 parts/sec on target
Exp Res 74 (2)
Experimental Results : 74Zn coulex
Physics MotivationExperimental Setup Experimental Results
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
: 2+0+ doppler corrected
Exp Res 76 (1)Experimental Results : 76Zn coulex
Physics MotivationExperimental Setup Experimental Results
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
76Zn beam on 120Sn target (2.3 mg/cm2 - 2.83 MeV/u)
14.5h ~1.3E6 parts/sec on target
Exp Res 76 (2)Experimental Results : 76Zn coulex
Physics MotivationExperimental Setup Experimental Results
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
76Zn beam on 120Sn target (2.3 mg/cm2 - 2.83 MeV/u)
14.5h ~1.3E6 parts/sec on target
76Zn: 2+0+ doppler corrected
76Ga
Exp Res 78 (1)
Experimental Results : 78Zn coulex
Physics MotivationExperimental Setup Experimental Results
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
78Zn beam on 108Pd target (2.0 mg/cm2 - 2.86 MeV/u)
23.5h ~3.2E4 parts/sec on target
78Zn
0+
2+
(4+)
(6+)
(8+)
73
08
91
2+ state in 78Zn: fixed
Exp Res 78 (2)
Experimental Results : 78Zn coulex
Physics MotivationExperimental Setup Experimental Results
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
78Zn beam on 108Pd target (2.0 mg/cm2 - 2.86 MeV/u)
23.5h ~3.2E4 parts/sec on target
doppler corrected
Exp Res theory
Experimental Results : coulex theory
Physics MotivationExperimental Setup Experimental Results
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
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
Physics MotivationExperimental Setup Experimental Results
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
: 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
Coulomb Excitation of Neutron Rich Zn Isotopes Jarno Van de Walle
July 2005 :
° 5-8th july : coulex of 68,70Ni (!) ° 13-18th july : coulex of 70Cu isomeres (!)
late 2005° re-measuring 78Zn + 80Zn