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Collective degrees of freedom of neutron-rich A approximate to 100 nuclei and the first mass measurement of the short-lived nuclide Rb-100

Abstract : The mass surface in the A similar to 100 region of the nuclear chart is extended by the measurement of the Rb98-100 isotopes with the Penning-trap mass spectrometer ISOLTRAP at ISOLDE/CERN. The mass of Rb-100 is determined for the first time. The studied nuclides mark the known low-Z frontier of the shape transition at N = 60. To describe the shape evolution towards the krypton isotopic chain, a theoretical analysis is presented in the framework of the Hartree-Fock-Bogoliubov approach. The importance of the pairing interaction for describing the extent and strength of the region of quadrupole deformation is emphasized. A later transition to large prolate deformation or, alternatively, the predominance of oblate deformation is proposed as explanation for the different behavior of the krypton isotopes. Octupole collectivity is explored as a possible mechanism for the evolution of two-neutron separation energies around N = 56.
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http://hal.in2p3.fr/in2p3-00924023
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Submitted on : Monday, January 6, 2014 - 11:02:33 AM
Last modification on : Wednesday, October 14, 2020 - 3:59:55 AM

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V. Manea, D. Atanasov, D. Beck, K. Blaum, C. Borgmann, et al.. Collective degrees of freedom of neutron-rich A approximate to 100 nuclei and the first mass measurement of the short-lived nuclide Rb-100. Physical Review C, American Physical Society, 2013, 88, pp.054322. ⟨10.1103/PhysRevC.88.054322⟩. ⟨in2p3-00924023⟩

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