Shape dynamics in neutron-rich Kr isotopes: Coulomb excitation of Kr-92, Kr-94 and Kr-96

M. Albers, K. Nomura, N. Warr, A. Blazhev, J. Jolie, D. Muecher, B. Bastin, C. Bauer, C. Bernards, L. Bettermann, V. Bildstein, J. Butterworth, M. Cappellazzo, J. Cederkaell, D. Cline, I. Darby, S. Das Gupta, J.M. Daugas, T. Davinson, H. De WitteJ. Diriken, D. Filipescu, E. Fiori, C. Fransen, L.P. Gaffney, G. Georgiev, R. Gernhaeuser, M. Hackstein, S. Heinze, H. Hess, M. Huyse, D. Jenkins, J. Konki, M. Kowalczyk, T. Kroell, R. Kruecken, J. Litzinger, R. Lutter, N. Marginean, C. Mihai, K. Moschner, P. Napiorkowski, B.S. Nara Singh, K. Nowak, J. Pakarinen, M. Pfeiffer, D. Radeck, P. Reiter, S. Rigby, L.M. Robledo, R. Rodriguez-Guzman, M. Rudigier, M. Scheck, M. Seidlitz, B. Siebeck, G.S. Simpson, P. Thoele, T. Thomas, J. Van de Walle, P. Van Duppen, M. Vermeulen, D. Voulot, R. Wadsworth, F. Wenander, K. Wimmer, K.O. Zell, M. Zielinska

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We report on the study of excited states in 92,94,96Kr populated via projectile Coulomb excitation at safe energies. The radioactive ion beams at energies of 2.85 MeV/u were delivered by the REX-ISOLDE facility at CERN and impinged on self-supporting 194,196Pt targets. The emitted γ-rays were detected by the Miniball detector-array. A detailed description of the experimental techniques used for extracting diagonal and transitional matrix elements and of the theoretical framework is given. The present experiment reveals the moderate evolution of the collective structure in the considered neutron-rich Kr isotopic chain, which is supported by the interacting boson model combined with the self-consistent mean-field method using a microscopic Gogny energy-density functional. The theory also suggests possible shape coexistence in the exotic nucleus 96Kr.
Original languageEnglish
Pages (from-to)1-28
Number of pages28
JournalNuclear Physics A
Publication statusPublished - 1 Feb 2013


  • Nuclear reactions194,196Pt(92Kr, 92Kr′)(94Kr, 94Kr′)(96Kr, 96Kr′)
  • E = 2.85MeV/nucleon
  • measured, projectile and target E
  • I(θ,t) using DSSD
  • Iγ(θ) from Coulomb excitation using HPGe array and considering Doppler correction
  • (particle)γ-coin
  • calculated, electromagnetic matrix elements
  • γ-ray yields using CC code GOSIA2
  • energy vs. deformation using IBM-2 with self-consistent constrained HFB with Gogny functional
  • deduced, Coulomb excitation σ
  • electromagnetic matrix elements using fit to data
  • B(E2),
  • quadrupole moments
  • IBM-2 Hamiltonian parameters
  • +96Kr calculated levels
  • J
  • π
  • deduced, shape coexistence


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