Identification of excited states in the T(z) = 1 nucleus (110)Xe: evidence for enhanced collectivity near the N=Z=50 double shell closure.
Gamma-ray transitions have been identified for the first time in the extremely neutron-deficient (N=Z+2) nucleus (110)Xe, and the energies of the three lowest excited states in the ground-state band have been deduced. The results establish a breaking of the normal trend of increasing first excited 2(+) and 4(+) level energies as a function of the decreasing neutron number as the N=50 major shell gap is approached for the neutron-deficient Xe isotopes. This unusual feature is suggested to be an effect of enhanced collectivity, possibly arising from isoscalar n-p interactions becoming increasingly important close to the N=Z line.
Sandzelius
M
M
Department of Physics, The Royal Institute of Technology, S-10691 Stockholm, Sweden.
Hadinia
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B
Cederwall
B
B
Andgren
K
K
Ganioğlu
E
E
Darby
I G
IG
Dimmock
M R
MR
Eeckhaudt
S
S
Grahn
T
T
Greenlees
P T
PT
Ideguchi
E
E
Jones
P M
PM
Joss
D T
DT
Julin
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R
Juutinen
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S
Khaplanov
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A
Leino
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M
Nelson
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L
Niikura
M
M
Nyman
M
M
Page
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RD
Pakarinen
J
J
Paul
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ES
Petri
M
M
Rahkila
P
P
Sarén
J
J
Scholey
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C
Sorri
J
J
Uusitalo
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J
Wadsworth
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R
Wyss
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R