Abstract
The Zirconium isotopes across the N=56,58 neutron subshell closures have been of special interest since years, sparked by the near doubly-magic features of 96Zr and the subsequent rapid onset of collectivity with a deformed ground-state structure already in 100Zr. Recent state-of-the-art shell model approaches did not only correctly describe this shape-phase transition in the Zr isotopic chain, but alsothe coexistence of non-collective structures and pronounced collectivity especially in 96,98Zr. Theisotope 98Zr is located on the transition from spherical to deformed ground state structures. We summarize recent experimental work to obtain the B(E2) excitation strengths of the first 2+ state of98Zr, including a new experiment employing the recoil-distance Doppler-shift method following a two-neutron transfer reaction.
Highlights
Shape coexistence in nuclei is a well-known phenomenon since decades, but in the last years it has been observed to manifest itself in various forms all across the nuclear chart
We summarize recent experimental work to obtain the B(E2) excitation strengths of the first 2+ state of 98Zr, including a new experiment employing the recoil-distance Doppler-shift method following a two-neutron transfer reaction
Since nuclei are not bound to one specific configuration of nucleons, coupling among themselves in various orbitals, they are not prone to one specific deformation, which is typically given in terms of the classic shape parameters β and γ
Summary
Shape coexistence in nuclei is a well-known phenomenon since decades, but in the last years it has been observed to manifest itself in various forms all across the nuclear chart. In this case a seniority-scheme dominated, non-collective spherical ground state structure exists, coexisting with an excitedstate structure which is much more collective and eventually somewhat deformed - the presently available spectroscopic data has recently been summarized in Ref. For 98Zr, until recently [8, 9] only the rather high excitation energy of the 2+1 state of 1223 keV has been known, but it was not clear whether the assumingly coexisting more collective structure already mixes into its wave function. The latter can be determined from the measurement of its B(E2) transition probability to the ground state. We will summarize the recent experiments to obtain this B(E2) value and present the first estimate from another, complimentary experiment
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