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, H.
- Calvet, D.
- Château, F.
- Chen, S.
- Corsi, A.
- Delbart, A.
- Gheller, J.M.
- Giganon, A.
- Gillibert, A.
- Lapoux, V.
- Motobayashi, T.
- Niikura, M.
- Paul, N.
- Roussé, 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.
- Cortés, M.L.
- Dewald, M.
- Ding, B.
- Franchoo, S.
- Górska, 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, N.
- Nita, C.
- Nobs, C.R.
- Olivier, L.
- Orlandi, R.
- Patel, Z.
- Podolyák, Zs.
- Rudigier, M.
- Saito, T.
- Shand, C.
- Söderström, P.A.
- Stefan, I.
- Vaquero, V.
- Werner, V.
- Wimmer, K.
- Xu, Z.
DOIAbstract
International audienceWe report on the first γ-ray spectroscopy of low-lying states in neutron-rich $^{98,100}$Kr isotopes obtained from $^{99,101}$(p,2p) reactions at ∼220 MeV/nucleon. A reduction of the 21+ state energies beyond N=60 demonstrates a significant increase of deformation, shifted in neutron number compared to the sharper transition observed in strontium and zirconium isotopes. State-of-the-art beyond-mean-field calculations using the Gogny D1S interaction predict level energies in good agreement with experimental results. The identification of a low-lying (02+, 22+) state in $^{98}$Kr provides the first experimental evidence of a competing configuration at low energy in neutron-rich krypton isotopes consistent with the oblat...
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