Possible overestimation of isomer depletion due to contamination
Possible overestimation of isomer depletion due to contamination
复制标题
由于污染可能高估异构体消耗
DOI：
10.1038/s41586-021-03333-5
复制
发表时间：
2021
期刊：
影响因子：
64.8
通讯作者：
Petrache C. M.
中科院分区：
文献类型：
--
作者：
Guo Song;Fang Yongde;Zhou Xiaohong;Petrache C. M.
Chiara等人最近的论文提供了电子捕获核激发（NEEC）的第一个实验证据，回应了长期的理论预测。NEEC被推断为将钼-93中的异构体激发到更高状态的主要通道，导致全部异构体能量的快速释放（异构体耗尽）。该机制的大激发几率P_{exc}$=0.010（3），表明它对核在恒星环境中的存活有很强的影响。然而，激发概率比根据以下理论工作估计的NEEC概率P_{NEEC}$高出约9个数量级。然而，据预测，已报道的P_{exc}$可能是由于其他未知的机制引起的同分异构体耗尽，这有望开辟核能储存和释放的新时代。在这里，我们报告的实验结果的分析，表明所观察到的异构体消耗显着高估，由于污染。
The recent paper by Chiara et al. provided the first experimental evidence of nuclear excitation by electron capture (NEEC), responding a long-standing theoretical prediction. NEEC was inferred to be the main channel to excite an isomer in Molybdenum-93 to a higher state, leading to a rapid release of full isomer energy (isomer depletion). The deduced large excitation probability $P_{exc}$=0.010(3) for this mechanism implied strong influence on the survival of nuclei in stellar environments. However, the excitation probability is much higher than the estimated NEEC probability $P_{NEEC}$ according to a following theoretical work by approximately 9 orders of magnitude. Nevertheless, the reported $P_{exc}$ is predicted to be due to other unknown mechanism causing isomer depletion, which is expected to open up a new era of the storage and release of nuclear energy. Here we report an analysis of the reported experimental results, showing that the observed isomer depletion is significantly overestimated due to the contamination.