Abstract
Excited states of the neutron-rich nuclei (97,99)Rb were populated for the first time using the multistep Coulomb excitation of radioactive beams. Comparisons of the results with particle-rotor model calculations provide clear identification for the ground-state rotational band of (97)Rb as being built on the πg(9/2) [431] 3/2(+) Nilsson-model configuration. The ground-state excitation spectra of the Rb isotopes show a marked distinction between single-particle-like structures below N=60 and rotational bands above. The present study defines the limits of the deformed region around A∼100 and indicates that the deformation of (97)Rb is essentially the same as that observed well inside the deformed region. It further highlights the power of the Coulomb-excitation technique for obtaining spectroscopic information far from stability. The (99)Rb case demonstrates the challenges of studies with very short-lived postaccelerated radioactive beams.
Highlights
Excited states of the neutron-rich nuclei 97;99Rb were populated for the first time using the multistep
The present study defines the limits of the deformed region around A ∼ 100 and indicates that the deformation of 97Rb is essentially the same as that observed well inside the deformed region
The 99Rb case demonstrates the challenges of studies with very short-lived postaccelerated radioactive beams
Summary
Excited states of the neutron-rich nuclei 97;99Rb were populated for the first time using the multistep. The ground-state excitation spectra of the Rb isotopes show a marked distinction between single-particle-like structures below N 1⁄4 60 and rotational bands above. Ground-state spin and moment studies of the Rb isotopes [8] revealed a sudden onset of deformation in 97Rb60 but failed to clearly identify whether it is associated with the πg9=21⁄24313=2þ or the πp3=21⁄23013=2− Nilsson orbital.
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