Z = 50 shell gap near 100Sn from intermediate-energy Coulomb excitations in even-mass 106-112Sn isotopes.
Rare isotope beams of neutron-deficient 106,108,110Sn from the fragmentation of 124Xe were employed in an intermediate-energy Coulomb excitation experiment. The measured B(E2,0(1)(+)-->2(1)(+)) values for 108Sn and 110Sn and the results obtained for the 106Sn show that the transition strengths for these nuclei are larger than predicted by current state-of-the-art shell-model calculations. This discrepancy might be explained by contributions of the protons from within the Z = 50 shell to the structure of low-energy excited states in this region.
Vaman
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National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
Andreoiu
C
C
Bazin
D
D
Becerril
A
A
Brown
B A
BA
Campbell
C M
CM
Chester
A
A
Cook
J M
JM
Dinca
D C
DC
Gade
A
A
Galaviz
D
D
Glasmacher
T
T
Hjorth-Jensen
M
M
Horoi
M
M
Miller
D
D
Moeller
V
V
Mueller
W F
WF
Schiller
A
A
Starosta
K
K
Stolz
A
A
Terry
J R
JR
Volya
A
A
Zelevinsky
V
V
Zwahlen
H
H