Competition between normal and intruder states inside the "island of inversion"
Competition between normal and intruder states inside the "island of inversion"
复制标题
DOI：
10.1103/physrevc.76.021301
复制
发表时间：
2007-03
影响因子：
3.1
通讯作者：
V. Tripathi;S. Tabor;P. Mantica;Y. Utsuno;P. Bender;J. Cook;C. Hoffman;Sangjin Lee;T. Otsuka;J. Pereira;M. Perry;K. Pepper;J. Pinter;J. Stoker;A. Volya;D. Weisshaar
中科院分区：
文献类型：
--
作者：
V. Tripathi;S. Tabor;P. Mantica;Y. Utsuno;P. Bender;J. Cook;C. Hoffman;Sangjin Lee;T. Otsuka;J. Pereira;M. Perry;K. Pepper;J. Pinter;J. Stoker;A. Volya;D. Weisshaar
The {beta}{sup -} decay of the exotic {sup 30}Ne (N=20) is reported. For the first time, the low-energy level structure of the N=19, {sup 30}Na (T{sub Z}=4), is obtained from {beta}-delayed {gamma} spectroscopy using fragment-{beta}-{gamma}-{gamma} coincidences. The level structure clearly displays ''inversion,'' i.e., intruder states with mainly 2p2h configurations displacing the normal states to higher excitation energies. The good agreement in excitation energies and the weak and electromagnetic decay patterns with Monte Carlo shell model calculations with the SDPF-M interaction in the sdpf valence space confirms the small d{sub 3/2}-f{sub 7/2} shell gap. The relative position of the normal dominant and intruder dominant excited states provides valuable information to understand better the N=20 shell gap.
The {beta}{sup -} decay of the exotic {sup 30}Ne (N=20) is reported. For the first time, the low-energy level structure of the N=19, {sup 30}Na (T{sub Z}=4), is obtained from {beta}-delayed {gamma} spectroscopy using fragment-{beta}-{gamma}-{gamma} coincidences. The level structure clearly displays ''inversion,'' i.e., intruder states with mainly 2p2h configurations displacing the normal states to higher excitation energies. The good agreement in excitation energies and the weak and electromagnetic decay patterns with Monte Carlo shell model calculations with the SDPF-M interaction in the sdpf valence space confirms the small d{sub 3/2}-f{sub 7/2} shell gap. The relative position of the normal dominant and intruder dominant excited states provides valuable information to understand better the N=20 shell gap.