Coulomb excitation of neutron-rich Zn isotopes: first observation of the 2(1)+ state in 80Zn.
Neutron-rich, radioactive Zn isotopes were investigated at the Radioactive Ion Beam facility REX-ISOLDE (CERN) using low-energy Coulomb excitation. The energy of the 2(1)+ state in 78Zn could be firmly established and for the first time the 2+ --> 0(1)+ transition in 80Zn was observed at 1492(1) keV. B(E2,2(1)+ --> 0(1)+) values were extracted for (74,76,78,80)Zn and compared to large scale shell model calculations. With only two protons outside the Z=28 proton core, 80Zn is the lightest N=50 isotone for which spectroscopic information has been obtained to date. Two sets of advanced shell model calculations reproduce the observed B(E2) systematics. The results for N=50 isotones indicate a good N=50 shell closure and a strong Z=28 proton core polarization. The new results serve as benchmarks to establish theoretical models, predicting the nuclear properties of the doubly magic nucleus 78Ni.
Van de Walle
J
J
Instituut voor Kern- en Stralingsfysica, KU Leuven, Leuven, Belgium.
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F
F
Ames
F
F
Behrens
T
T
Bildstein
V
V
Blazhev
A
A
Cederkäll
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J
Clément
E
E
Cocolios
T E
TE
Davinson
T
T
Delahaye
P
P
Eberth
J
J
Ekström
A
A
Fedorov
D V
DV
Fedosseev
V N
VN
Fraile
L M
LM
Franchoo
S
S
Gernhauser
R
R
Georgiev
G
G
Habs
D
D
Heyde
K
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Huber
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G
Huyse
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M
Ibrahim
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Ivanov
O
O
Iwanicki
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Köster
U
U
Kröll
T
T
Krücken
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R
Lauer
M
M
Lisetskiy
A F
AF
Lutter
R
R
Marsh
B A
BA
Mayet
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P
Niedermaier
O
O
Nilsson
T
T
Pantea
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M
Perru
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O
Raabe
R
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Reiter
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P
Sawicka
M
M
Scheit
H
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Schrieder
G
G
Schwalm
D
D
Seliverstov
M D
MD
Sieber
T
T
Sletten
G
G
Smirnova
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N
Stanoiu
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M
Stefanescu
I
I
Thomas
J-C
JC
Valiente-Dobón
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JJ
Van Duppen
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P
Verney
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D
Voulot
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D
Warr
N
N
Weisshaar
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D
Wenander
F
F
Wolf
B H
BH
Zielińska
M
M