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.
Department of Physics, The Royal Institute of Technology, S-10691 Stockholm, Sweden.
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Sandzelius
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Hadinia
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Andgren
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Ganioğlu
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Dimmock
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Eeckhaudt
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Grahn
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Pakarinen
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Petri
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Scholey
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Sorri
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Wadsworth
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