Abstract
Excited states of the positive-parity intruder band in 112Sn, populated in the 100Mo( 20Ne, α 4 n ) reaction at a beam energy of 136 MeV, have been studied. The band has been observed up to 11570.0 keV with spin (24 +). Mean lifetimes have been measured for six states up to the 22 +, 10335.1 keV level and an upper limit of the lifetime has been estimated for the 11570.0 keV (24 +) state. The B(E2) values, derived from the present lifetime results, correspond to a moderate quadrupole deformation of β 2 ∼ 0.18 for states with spin J π ⩾ 12 + , and the decrease in B(E2) for the 14 + → 12 + transition is consistent with a ν ( h 11 / 2 ) 2 alignment at ℏ ω ∼ 0.35 MeV , predicted by a cranked shell-model calculation. Total Routhian surface calculations predict a triaxial shape following the alignment.
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