Collective degrees of freedom of neutron-rich A approximate to 100 nuclei and the first mass measurement of the short-lived nuclide Rb-100
Date
2013Author
Zuber, K.
Kreim, S.
Litvinov, Yu. A.
Lunney, D.
Neidherr, D.
Rosenbusch, M.
Schweikhard, L.
Wienholtz, F.
Wolf, R. N.
Cakirli, Rabia Burcu
Manea, V.
Atanasov, D.
Beck, D.
Blaum, K.
Borgmann, C.
Eronen, T.
George, S.
Herfurth, F.
Herlert, A.
Kowalska, M.
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Show full item recordAbstract
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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