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arXiv 2102.03996nucl-ex
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丰中子~（106）Nb的基态和衰变性质

Ground-state and decay properties of neutron-rich 106Nb

A. J. Mitchell, R. Orford, G. J. Lane, C. J. Lister, P. Copp, J. A. Clark, G. Savard, J. M. Allmond, A. D. Ayangeakaa, S. Bottoni, M. P. Carpenter, P. Chowdhury… 展开作者

A. J. Mitchell, R. Orford, G. J. Lane, C. J. Lister, P. Copp, J. A. Clark, G. Savard, J. M. Allmond, A. D. Ayangeakaa, S. Bottoni, M. P. Carpenter, P. Chowdhury, D. A. Gorelov, R. V. F. Janssens, F. G. Kondev, U. Patel, D. Seweryniak, M. L. Smith, Y. Y. Zhong, S. Zhu

备注：
16 pages, 9 figures, accepted in Physical Review C (02/02/2021)
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摘要：

利用美国阿贡国家实验室的CARIBU放射性离子束装置研究了丰中子~（106）Nb的基态性质及其β衰变为~（106）Mo的过程。铌-106离子从252 Cf裂变源中提取，并在作为低能束输送到加拿大潘宁阱以及X阵列和SATURN β衰变光谱站之前进行质量分离。测得的106 Nb基态质量过剩为-66202.0（13）keV，与最近的测量结果一致，但精度要高出三倍;这项工作还排除了激发能高于5 keV的106 Nb中存在第二个长寿命β衰变态。测得106 Nb的衰变半衰期为1.097（21）s，比采用值长8%。衰变产物106 Mo的能级方案已扩展到约4 MeV。J >= 3的106 Mo的衰变强度分布和相当多的激发态分布强调了需要修改106 Nb的Jpi = 1-基态自旋宇称分配;它更可能是J => 3。

英文摘要：

The ground-state properties of neutron-rich 106Nb and its beta decay into 106Mo have been studied using the CARIBU radioactive-ion-beam facility at Argonne National Laboratory. Niobium-106 ions were extracted from a 252Cf fission source and mass separated before being delivered as low-energy beams to the Canadian Penning Trap, as well as the X-Array and SATURN beta-decay-spectroscopy station. The measured 106Nb ground-state mass excess of -66202.0(13) keV is consistent with a recent measurement but has three times better precision; this work also rules out the existence of a second long-lived, beta-decaying state in 106Nb above 5 keV in excitation energy. The decay half-life of 106Nb was measured to be 1.097(21) s, which is 8% longer than the adopted value. The level scheme of the decay progeny, 106Mo, has been expanded up to approximately 4 MeV. The distribution of decay strength and considerable population of excited states in 106Mo of J >= 3 emphasises the need to revise the adopted Jpi = 1- ground-state spin-parity assignment of 106Nb; it is more likely to be J => 3.

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