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arXiv 2103.15893nucl-ex
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241Am核衰变中新的可实验观测的伽马射线发射

New Experimentally Observable Gamma-ray Emissions from 241Am Nuclear Decay

Katrina E. Koehler, Michael D. Yoho, Matthew H. Carpenter, Mark P. Croce, David J. Mercer, Chandler M. Smith, Aidan D. Tollefson, Duc T. Vo, Michael A. Famiano,… 展开作者

Katrina E. Koehler, Michael D. Yoho, Matthew H. Carpenter, Mark P. Croce, David J. Mercer, Chandler M. Smith, Aidan D. Tollefson, Duc T. Vo, Michael A. Famiano, Caroline D. Nesaraja, Daniel T. Becker, Johnathon D. Gard, Abigail L. Wessels, Douglas A. Bennett, J. A. B. Mates, Nathan J. Ortiz, Daniel R. Schmidt, Joel N. Ullom, Leila R. Vale

AI总结:

本研究利用带微波多路复用读出的大型伽马微热量计阵列及改进算法,观测到Am-241衰变中两条未被预测的新伽马谱线,计算了对应跃迁分支比,对核材料保障与衡算有重要意义。

摘要:

凭借微热量计探测器的高分辨率,此前无法分辨的伽马射线谱线如今已能被清晰分辨。研究人员利用大型伽马射线微热量计阵列对镅-241(Am-241)衰变进行精细测量,发现了此前从未被观测或预测到的伽马谱线,能量分别为207.72±0.02 keV和208.21±0.01 keV。这些成果的取得得益于新型微波多路复用读出技术(用于扩大阵列规模)以及改进的分析算法(用于消除光谱伪影)。本文提出了这些伽马射线可能源自的核能级,并通过混合钚-镅标准样品与纯Am-241源的测量,计算了这些跃迁的分支比。这些结果对核材料保障与衡算具有重要意义,尤其对目前正被核保障分析实验室采用的微热量计伽马能谱仪而言。

英文摘要:

With the high resolution of microcalorimeter detectors, previously unresolvable gamma-ray lines are now clearly resolvable. A careful measurement of Am-241 decay with a large array of gamma-ray microcalorimeters has revealed never before seen or predicted gamma lines at 207.72 +/- 0.02 keV and 208.21 +/- 0.01 keV. These results were made possible by new microwave-multiplexing readout to increase the array size and improved analysis algorithms to eliminate spectral artifacts. We suggest nuclear levels from which these gamma-rays might originate and calculate branching ratios for these transitions from measurements of both mixed Pu-Am standards and a pure Am-241 source. These results have implications for nuclear material safeguards and accounting, particularly for microcalorimeter gamma spectrometers, which are now being adopted in nuclear safeguards analytical laboratories.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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