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Rb379760: The Cornerstone of the Region of Deformation around A100

C. Sotty et al.
Phys. Rev. Lett. 115, 172501 – Published 20 October 2015

Abstract

Excited states of the neutron-rich nuclei Rb97,99 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 Rb97 as being built on the πg9/2 [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 A100 and indicates that the deformation of Rb97 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 Rb99 case demonstrates the challenges of studies with very short-lived postaccelerated radioactive beams.

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  • Received 3 August 2015
  • Publisher error corrected 5 November 2015

DOI:https://doi.org/10.1103/PhysRevLett.115.172501

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

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5 November 2015

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Vol. 115, Iss. 17 — 23 October 2015

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