Spectroscopic Quadrupole Moments in $^{96;98}$Sr: Evidence for Shape Coexistence in Neutron-Rich Strontium Isotopes at N = 60

E. Clément 1 M. Zielińska 2 A. Görgen W. Korten 2 S. Péru 3 J. Libert 3 H. Goutte 2 S. Hilaire 3 B. Bastin 1 C. Bauer A. Blazhev N. Bree B. Bruyneel P. A. Butler J. Butterworth P. Delahaye 1 A. Dijon 1 D. T. Doherty A. Ekström C. Fitzpatrick C. Fransen G. Georgiev 4 R. Gernhäuser H. Hess J. Iwanicki D.G. Jenkins A.C. Larsen J. Ljungvall 4 R. Lutter P. Marley K. Moschner P. J. Napiorkowski J. Pakarinen A. Petts P. Reiter T. Renstrøm M. Seidlitz B. Siebeck S. Siem C. Sotty 4 J. Srebrny I. Stefanescu G.M. Tveten J. van De Walle M. Vermeulen D. Voulot N. Warr F. Wenander A. Wiens H. De Witte K. Wrzosek-Lipska
1 GANIL - Grand Accélérateur National d'Ions Lourds
2 DPHN - Département de Physique Nucléaire (ex SPhN)
3 DAM - Direction des Applications Militaires
4 CSNSM SNO - Centre de Sciences Nucléaires et de Sciences de la Matière
Abstract : Neutron-rich $^{96,98}$Sr isotopes have been investigated by safe Coulomb excitation of radioactive beams at the REX-ISOLDE facility. Reduced transition probabilities and spectroscopic quadrupole moments have been extracted from the differential Coulomb excitation cross sections. These results allow, for the first time, the drawing of definite conclusions about the shape coexistence of highly deformed prolate and spherical configurations. In particular, a very small mixing between the coexisting states is observed, contrary to other mass regions where strong mixing is present. Experimental results have been compared to beyond-mean-field calculations using the Gogny D1S interaction in a five-dimensional collective Hamiltonian formalism, which reproduce the shape change at N=60.
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Submitted on : Friday, January 15, 2016 - 9:49:03 PM
Last modification on : Tuesday, July 16, 2019 - 9:02:07 AM

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E. Clément, M. Zielińska, A. Görgen, W. Korten, S. Péru, et al.. Spectroscopic Quadrupole Moments in $^{96;98}$Sr: Evidence for Shape Coexistence in Neutron-Rich Strontium Isotopes at N = 60. Physical Review Letters, American Physical Society, 2016, 116, pp.022701. ⟨10.1103/PhysRevLett.116.022701⟩. ⟨in2p3-01257200⟩

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