Low-lying level structure of the neutron-rich nucleus 109Nb: A possible oblate-shape isomer

Low-lying level structure of the neutron-rich nucleus 109Nb: A possible oblate-shape isomer
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富中子核109Nb的低位能级结构:可能的扁圆异构体

DOI:
10.1016/j.physletb.2010.12.028
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发表时间:
2011
期刊:
影响因子:
4.4
通讯作者:
H. Watanabe
H. Watanabe
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
H. Watanabe

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利用238 U束流在RIBF装置上以345 MeV/核子的能量进行了丰中子核109 Nb和109 Zr的飞行裂变。首次在109 Nb中发现了T1/2=150(30)ns的313 keV同分异构体。109 Nb的低能级也随着109 Zr的β衰变而布居。根据同质异能态与β衰变的不同,建立了109 Nb同质异能态的衰变图式。观察到的电磁跃迁退激异构态的障碍进行了讨论,在可能的形状共存。势能面计算的单质子配置预测的存在下,低洼扁圆形变态in 109 Nb。
The neutron-rich nuclei109Nb and109Zr have been populated using in-flight fission of a238U beam at 345 MeV/nucleon at the RIBF facility. A T1/2=150(30) ns isomer at 313 keV has been identified in109Nb for the first time. The low-lying levels in109Nb have been also populated following the β-decay of109Zr. Based on the difference in feeding pattern between the isomeric and β decays, the decay scheme from the isomeric state in109Nb was established. The observed hindrances of the electromagnetic transitions deexciting the isomeric state are discussed in terms of possible shape coexistence. Potential energy surface calculations for single-proton configurations predict the presence of low-lying oblate-deformed states in109Nb.
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