Shape Evolution in Neutron-Rich Krypton Isotopes Beyond N=60: First Spectroscopy of ^{98,100}Kr.

Shape Evolution in Neutron-Rich Krypton Isotopes Beyond N=60: First Spectroscopy of ^{98,100}Kr.
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DOI：
10.1103/physrevlett.118.242501
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发表时间：
2017-06
期刊：
Physical review letters
影响因子：
8.6
通讯作者：
F. Flavigny;P. Doornenbal;A. Obertelli;J. Delaroche;M. Girod;J. Libert;T. R. Rodríguez;G. Authelet;H. Baba;D. Calvet;F. Château;S. Chen;A. Corsi;A. Delbart;J. Gheller;A. Giganon;A. Gillibert;V. Lapoux;T. Motobayashi;M. Niikura;N. Paul;J. Rousse;H. Sakurai;C. Santamaria;D. Steppenbeck;R. Taniuchi;T. Uesaka;T. Ando;T. Arici;A. Blazhev;F. Browne;A. Bruce;R. Carroll;L. X. Chung;M. L. Cortés;M. Dewald;B. Ding;S. Franchoo;M. Gorska;A. Gottardo;A. Jungclaus;J. Lee;M. Lettmann;B. Linh;J. Liu;Z. Liu;C. Lizarazo;S. Momiyama;K. Moschner;S. Nagamine;N. Nakatsuka;C. Nita;C. Nobs;L. Olivier;R. Orlandi;Z. Patel;Z. Podolyák;M. Rudigier;T. Saito;C. Shand;P. Söderström;I. Stefan;V. Vaquero;V. Werner;K. Wimmer;Z. Xu
F. Flavigny;P. Doornenbal;A. Obertelli;J. Delaroche;M. Girod;J. Libert;T. R. Rodríguez;G. Authelet;H. Baba;D. Calvet;F. Château;S. Chen;A. Corsi;A. Delbart;J. Gheller;A. Giganon;A. Gillibert;V. Lapoux;T. Motobayashi;M. Niikura;N. Paul;J. Rousse;H. Sakurai;C. Santamaria;D. Steppenbeck;R. Taniuchi;T. Uesaka;T. Ando;T. Arici;A. Blazhev;F. Browne;A. Bruce;R. Carroll;L. X. Chung;M. L. Cortés;M. Dewald;B. Ding;S. Franchoo;M. Gorska;A. Gottardo;A. Jungclaus;J. Lee;M. Lettmann;B. Linh;J. Liu;Z. Liu;C. Lizarazo;S. Momiyama;K. Moschner;S. Nagamine;N. Nakatsuka;C. Nita;C. Nobs;L. Olivier;R. Orlandi;Z. Patel;Z. Podolyák;M. Rudigier;T. Saito;C. Shand;P. Söderström;I. Stefan;V. Vaquero;V. Werner;K. Wimmer;Z. Xu
中科院分区：
物理与天体物理1区
文献类型：
--
作者：
F. Flavigny;P. Doornenbal;A. Obertelli;J. Delaroche;M. Girod;J. Libert;T. R. Rodríguez;G. Authelet;H. Baba;D. Calvet;F. Château;S. Chen;A. Corsi;A. Delbart;J. Gheller;A. Giganon;A. Gillibert;V. Lapoux;T. Motobayashi;M. Niikura;N. Paul;J. Rousse;H. Sakurai;C. Santamaria;D. Steppenbeck;R. Taniuchi;T. Uesaka;T. Ando;T. Arici;A. Blazhev;F. Browne;A. Bruce;R. Carroll;L. X. Chung;M. L. Cortés;M. Dewald;B. Ding;S. Franchoo;M. Gorska;A. Gottardo;A. Jungclaus;J. Lee;M. Lettmann;B. Linh;J. Liu;Z. Liu;C. Lizarazo;S. Momiyama;K. Moschner;S. Nagamine;N. Nakatsuka;C. Nita;C. Nobs;L. Olivier;R. Orlandi;Z. Patel;Z. Podolyák;M. Rudigier;T. Saito;C. Shand;P. Söderström;I. Stefan;V. Vaquero;V. Werner;K. Wimmer;Z. Xu

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本文报道了在~ 1220 MeV/核子的^{99，101}Rb（p，2 p）反应中首次获得的富中子^{98，100}Kr同位素低激发态的γ能谱。N=60以后2_{1}^{+}态能量的降低表明形变的显著增加，与在锶和锆同位素中观察到的更尖锐的跃迁相比，中子数发生了偏移。国家的最先进的超越平均场计算使用Gogny D1 S相互作用预测能级能量与实验结果吻合得很好。在^{98}Kr中发现了（0_{2}^{+}，2_{2}^{+}）低能态，这为富中子氪同位素中低能竞争组态的发现提供了第一个实验证据，与理论上提出的扁长共存图象相一致。
We report on the first γ-ray spectroscopy of low-lying states in neutron-rich ^{98,100}Kr isotopes obtained from ^{99,101}Rb(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-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 (0_{2}^{+}, 2_{2}^{+}) state in ^{98}Kr provides the first experimental evidence of a competing configuration at low energy in neutron-rich krypton isotopes consistent with the oblate-prolate shape coexistence picture suggested by theory.