锆-88热中子吸收的同质异能态产额比测量
Measurement of the Isomeric Yield Ratio for Zirconium-88 Thermal Neutron Absorption
AI总结：
针对锆-88的大热中子吸收截面，本工作通过反应堆辐照结合高纯锗探测，测量得到锆-89同质异能态产额比为74.9±0.6%，为相关中子吸收研究提供数据支撑。
摘要：
鉴于近期观测到锆-88具有800000靶恩的热中子吸收截面，本工作研究了锆-89的亚稳态与基态生成比例（同质异能态产额比），以及其对正在开展的锆-88中子吸收相关测量的意义。锆-89的亚稳态位于基态上方588 keV处，半衰期为4.2分钟。将5μCi的锆-88样品在TRIGA Mark II核研究反应堆堆芯中辐照10分钟，并在辐照结束3分钟后用高纯锗探测器进行测量。测得同质异能态产额比为74.9±0.6%。
英文摘要：
In light of the recently observed 800,000 barn thermal neutron absorption cross section of zirconium-88, this work investigates the fraction (isomeric yield ratio) of metastable versus ground state production of zirconium-89 and implications for ongoing measurements around zirconium-88 neutron absorption. The metastable state of zirconium-89 resides at 588 keV above the ground state with a half life of 4.2 minutes. A 5 $μ$Ci zirconium-88 sample was irradiated for 10 minutes in the core of a TRIGA Mark II nuclear research reactor and measured with a high purity germanium detector 3 minutes after irradiation. The isomeric yield ratio was measured to be 74.9$\pm$0.6\%.
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