Probing Mo93m Isomer Depletion with an Isomer Beam
Probing Mo93m Isomer Depletion with an Isomer Beam
复制标题
使用异构体束探测 Mo93m 异构体耗尽
DOI：
10.1103/physrevlett.128.242502
复制
发表时间：
2022
影响因子：
8.6
通讯作者：
L. J
中科院分区：
文献类型：
--
作者：
S. Guo;B. Ding;X. H. Zhou;Y. B. Wu;J. G. Wang;S. W. Xu;Y. D. Fang;C. M. Petrache;E. A. Lawrie;Y. H. Qiang;Y. Y. Yang;H. J. Ong;J. B. Ma;J. L. Chen;F. Fang;Y. H. Yu;B. F. Lv;F. F. Zeng;Q. B. Zeng;H. Huang;Z. H. Jia;C. X. Jia;W. Liang;Y. Li;N. W. Huang;L. J
最近报道了异构体消耗[Chiaraet al.，Nature（伦敦）554，216（2018）NATUAS 0028 -083610.1038/nature 25483]作为通过电子捕获（NEEC）的核激发的首次直接观察。然而，1.0（3）%的实测激发概率远远超出了理论预期。为了理解理论和实验之间的不一致，我们在559 MeV的束流能量下用反应产生核，并使用次级束线将反应残留物运送到远离靶区的检测站。预计在停止材料中的离子的减速过程期间发生异构体耗尽。在这样的低射线背景环境中，没有观察到异构体耗尽的特征，并且估计了激发概率的上限。这与理论预期是一致的。我们的研究结果消除了对之前报道的NEEC现象的怀疑，并强调了进一步实验研究以重新检查低射线背景下异构体耗尽的必要性和可行性。
The isomer depletion ofwas recently reported [Chiaraet al., Nature (London) 554, 216 (2018)NATUAS0028-083610.1038/nature25483] as the first direct observation of nuclear excitation by electron capture (NEEC). However, the measured excitation probability of 1.0(3)% is far beyond the theoretical expectation. In order to understand the inconsistency between theory and experiment, we produce thenuclei using thereaction at a beam energy of 559 MeV and transport the reaction residues to a detection station far away from the target area employing a secondary beam line. The isomer depletion is expected to occur during the slowdown process of the ions in the stopping material. In such a low-ray background environment, the signature of isomer depletion is not observed, and an upper limit ofis estimated for the excitation probability. This is consistent with the theoretical expectation. Our findings shed doubt on the previously reported NEEC phenomenon and highlight the necessity and feasibility of further experimental investigations for reexamining the isomer depletion under low-ray background.