β-decay study of neutron-rich nucleus ~(34) Al

The “island of inversion” has been known for over a quarter century, since Warburton et al. proposed that nuclei with intruder ground states would constitute a 3×3 square with Z=10-12, N=20-22 in 1990. Uncovering the underlying inversion mechanism and exploring the scope of the island have attracted significan ttheoretica lan dexperimenta lefforts in the following years. Now it is well known that the reduction of N=20 shell gap, which is likely caused by the strong nucleon-nucleon tensor interaction, allows the intrusion of neutron orbits from the pf shell into the sd shell and results in the inversion of the 2p-2h intruder and 0p-0h normal configuration so fth enuclea rgroun dstate si nthi sregion .Meanwhile, the original border of the “island of inversion” has been extended greatly.supported by the National Natural Science Foundation of China,the China Postdoctoral Science Foundation,the Chinese Major State Basic Research Development Program中国科学引文数据库(CSCD)4042021-1-042021-56