Direct observation of the exotic β-γ-α decay mode in the Tz = −1 nucleus 20Na
Direct observation of the exotic β-γ-α decay mode in the Tz = −1 nucleus 20Na
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直接观察 Tz = Ø1 核 20Na 中奇异的 β-γ-α 衰变模式
DOI：
10.1103/physrevc.103.l011301
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发表时间：
2021
影响因子：
3.1
通讯作者：
Z.Y. Han et al
中科院分区：
文献类型：
--
作者：
Y.B. Wang;J. Su;Z.Y. Han et al
在北京放射性离子束装置的第一天实验中，首次直接观测到了奇特衰变模式。源是用100 MeV的质子束轰击一堆微孔氧化镁厚靶产生的，在线电离后以强质量分离束的形式输送。高效率地同时测量、和跃迁使延迟和符合光谱成为可能。发现了三个奇特的衰变序列，扩展了在衰变中观察到的罕见的衰变模式。此外，观察到了到6130-keV态的-衰变序列，这可能是通过-keV态来实现的。实验结果与壳模型计算结果进行了比较，壳模型空间相互作用可以很好地解释允许的跃迁强度。
The exoticdecay mode ofhas been directly observed for the first time in the Day-one experiment at the Beijing Radioactive Ion-beam Facility. Thesource was produced by using a 100-MeV proton beam bombarding a stack of microporous MgO thick target and delivered as an intense mass separated beam after online ionization. A high-efficiency simultaneous measurement of, andtransitions enables the-delayedandcoincidence spectroscopy. Threeexotic decay sequences inare discovered, which expands the rare decay modes observed indecay. Moreover, a–decay sequence to the 6130-keVstate ofis observed, which is likely through the-keVstate in. The experimentally deducedandare compared to the shell-model calculation, the allowedtransition strengths can be well accounted for by usingshell-model space interactions.