Shape Evolution in Neutron-rich Krypton Isotopes beyond N = 60 : First spectroscopy of 98;100Kr
- Flavigny, F
- Doornenbal, P
- Obertelli, A
- Delaroche, J-P
- Girod, M
- Libert, J
- Rodriguez, TR
- Authelet, G
- Baba, H
- Calvet, D
- Chateau, F
- Chen, S
- Corsi, A
- Delbart, A
- Gheller, J-M
- Giganon, A
- Gillibert, A
- Lapoux, V
- Motobayashi, T
- Niikura, M
- Paul, N
- Rousse, J-Y
- Sakura, H
- Santamaria, C
- Steppenbeck, D
- Taniuchi, R
- Uesaka, T
- Ando, T
- Arici, T
- Blazhev, A
- Browne, F
- Bruce, A
- Carroll, R
- Chung, LX
- Cortes, ML
- Dewald, M
- Ding, B
- Franchoo, S
- Gorska, M
- Gottardo, A
- Jungclaus, A
- Lee, J
- Lettmann, M
- Linh, BD
- Liu, J
- Liu, Z
- Lizarazo, C
- Momiyama, S
- Moschner, K
- Nagamine, S
- Nakatsuka, N
- Nita, C
- Nobs, CR
- Olivier, L
- Orlandi, R
- Patel, Z
- Podolyak, Zsolt
- Rudigier, M
- Saito, T
- Shand, C
- Soderstrom, PA
- Stefan, I
- Vaquero, V
- Werner, V
- Wimmer, K
- Xu, Z
DOIAbstract
We report on the first γ-ray spectroscopy of low-lying states in neutron-rich 98,100Kr isotopes obtained from 99,101Rb(p,2p) reactions at ∼ 220 MeV/nucleon. A reduction of the 2+ 1 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-theart beyond-mean-field calculations using the Gogny D1S interaction predict level energies in good agreement with experimental results. The identification of a low-lying (0+ 2 , 2+ 2 ) state in 98Kr provides the first experimental evidence of a competing configuration at low energy in neutron-rich krypton isotopes consistent with the oblate-prolate shape coexistence p...
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