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Shape coexistence in the odd-odd neutron-rich nucleus 98Y studied in the interacting boson model

Data on levels in 98Y have been investigated and interpreted using recently published information on band structure in this region. Calculation in the IBM framework suggests that the 1182 keV isomer is spherical 10- state with pi g9/2 nu h11/2 configuration. This assignment implies that the 8.0 microsecond bandhead at 496 keV is a 4- state with highly probable pi(422)5/2 nu(541)3/2 configuration. The level structure of 98Y is well reproduced by coupling the levels of its both spherical and deformed odd-A neighbors and the origin of the isomeric states is understood.

interacting boson model; nuclear structure; shape coexistence

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