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Report No.

Shape evolution in neutron-rich krypton isotopes beyond N=60; First spectroscopy of $$^{98,100}$$Kr

Flavigny, F.*; Doornenbal, P.*; Obertelli, A.*; Delaroche, J.-P.*; Girod, M.*; Libert, J.*; Rodriguez, T. R.*; Authelet, G.*; Baba, Hidetada*; Calvet, D.*; Ch$^a$teau, F.*; Chen, S.*; Corsi, A.*; Delbart, A.*; Gheller, J.-M.*; Giganon, A.*; Gillibert, A.*; Lapoux, V.*; Motobayashi, Toru*; Niikura, Megumi*; Paul, N.*; Rouss$'e$, J.-Y.*; Sakurai, H.*; Santamaria, C.*; Steppenbeck, D.*; Taniuchi, R.*; Uesaka, T.*; Ando, T.*; Arici, T.*; Blazhev, A.*; Browne, F.*; Bruce, A.*; Carroll, R.*; Chung, L. X.*; Cort$'e$s, M. L.*; Dewald, M.*; Ding, B.*; Franchoo, S.*; G$'o$rska, M.*; Gottardo, A.*; Jungclaus, A.*; Lee, J.*; Lettmann, M.*; Linh, B. D.*; Liu, J.*; Liu, Z.*; Lizarazo, C.*; Momiyama, S.*; Moschner, K.*; Nagamine, S.*; Nakatsuka, Noritsugu*; Nita, C.*; Nobs, C.*; Olivier, L.*; Orlandi, R.  ; Patel, Z.*; Podoly$'a$k, Zs.*; Rudigier, M.*; Saito, T.*; Shand, C.*; S$"o$derstr$"o$m, P. A.*; Stefan, I.*; Vaquero, V.*; Werner, V.*; Wimmer, K.*; Xu, Z.*

The first $$gamma$$-ray spectroscopy of very neutron rich $$^{98,100}$$Kr isotopes was carried out at the RIBF at RIKEN Nishina center. Excited states in these isotopes were populated via (p,2p) reactions using radioactive $$^{99,101}$$Rb beams accelerated to 220 MeV/nucleon. The new data show a significant increase in deformation beyond N=60, as well as competing configurations (shape-coexistence) at low energy. The data were compared with beyond-mean-field calculations which predict level energies in good agreement with observation, and suggest oblate-prolate shape coexistence.



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Category:Physics, Multidisciplinary



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