Abstract
The nuclear structure of the odd–odd nucleus 98Y has been re-investigated by observing prompt rays emitted following the proton-induced fission of a 238U target, using the JUROGAM-II multidetector array. New highspin decays have been observed and placed in the level schemes using triple coincidences. The experimental level energies and -decay patterns are compared to GICM and QPRM calculations, assuming that this neutronrich N = 59 isotone is spherical at low energies and prolate deformed at intermediate spins.
Highlights
Nuclear shape evolution is a highly topical issue in nuclear physics [1,2,3]
It can be seen in the spectrum that the most intense transitions of 98Y are present along with several ones belonging to the complementary Xe nuclei, as well as uranium X rays originating from protons interacting with 238U target
These transitions have been determined to belong to the nucleus 98Y with many checks made in order to eliminate the possibility that either they belong to Xe complementary fission partner nuclei, or that they belong to a contaminant with similar transition energies
Summary
Nuclear shape evolution is a highly topical issue in nuclear physics [1,2,3] Interesting are those situations where nuclear structure and shapes change suddenly between neighboring nuclides. These effects are well-known in the neutron-rich isotopes with masses A ∼ 100 [4, 5]. It was shown that levels of 98Y below 500 keV could be described by coupling the πp1/2 orbit to the lowest-lying spherical neutron levels of the neighboring isotones (N = 59) 97Sr and 97Zr. The best evidence for excited deformed states is a rather regular rotational band, with a bandhead at 496 keV. The interpretation of deformed levels in 98Y has long remained speculative due to the poor knowledge of the experimental levels
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