论文标题
在$^{208} $ pb附近高激发的极端核异构主义岛的出现
Emergence of an island of extreme nuclear isomerism at high excitation near $^{208}$Pb
论文作者
论文摘要
具有T $ _ {1/2} $ = 8（2）ms的亚稳态状态，in $^{205} $ bi和t $ _ {1/2} $ = 0.22（2）MS in $^{204} $ PB，$ \ $ \ $ \ $ \ $ 8 MEV激发能量和Angular Moment $ \ ge $ \ ge $ \ $ \ $ \ $ \ $ \ $ \ $ \ $ 22 $ \ hbar $ \ hbar $ \ hbar at he at he at he at he at he at he at he at he at he he at he he at he he he he he he he he he he at home这些代表最多两个数量级，是核图表中曾经确定的高于7 MEV的激发能量以上最长的核国家。此外，已确定为$^{206} $ bi的10.17 MEV状态的半衰期已确定为0.027（2）MS，这是这个非常激动的制度中的下一个最高价值。这些观察结果表明，在双重封闭的壳核$^{208} $ pb附近，核心兴奋的核心构型引起的极端核异构主义岛的出现。预计这些结果将提供当前大规模壳模计算中使用的有效相互作用的区分测试。
Metastable states with T$_{1/2}$ = 8(2) ms in $^{205}$Bi and T$_{1/2}$ = 0.22(2) ms in $^{204}$Pb, with $\approx $ 8 MeV excitation energy and angular momentum $\ge $ 22 $\hbar $, have been established. These represent, by up to two orders of magnitude, the longest-lived nuclear states above an excitation energy of 7 MeV, ever identified in the nuclear chart. Additionally, the half-life of the 10.17 MeV state in $^{206}$Bi has been determined to be 0.027(2) ms, the next highest value in this highly excited regime. These observations indicate the emergence of an island of extreme nuclear isomerism arising from core-excited configurations at high excitation in the vicinity of the doubly closed-shell nucleus $^{208}$Pb. These results are expected to provide discriminating tests of the effective interactions used in current large-scale shell-model calculations.
