New mass anchor points for neutron-deficient heavy nuclei from direct mass measurements of radium and actinium isotopes
New mass anchor points for neutron-deficient heavy nuclei from direct mass measurements of radium and actinium isotopes
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DOI：
10.1103/physrevc.97.064306
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发表时间：
2018-01
影响因子：
3.1
通讯作者：
M. Rosenbusch;Y. Ito;P. Schury;M. Wada;D. Kaji;K. Morimoto;H. Haba;S. Kimura;H. Koura;M. Maccormick;H. Miyatake;J. Moon;K. Morita;I. Murray;T. Niwase;A. Ozawa;M. Reponen;A. Takamine;T. Tanaka;H. Wollnik
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文献类型：
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作者：
M. Rosenbusch;Y. Ito;P. Schury;M. Wada;D. Kaji;K. Morimoto;H. Haba;S. Kimura;H. Koura;M. Maccormick;H. Miyatake;J. Moon;K. Morita;I. Murray;T. Niwase;A. Ozawa;M. Reponen;A. Takamine;T. Tanaka;H. Wollnik
稀有同位素Ac 210 −214和Ra 210 −214的质量已经用多重反射飞行时间质谱仪测量过。这些同位素是在RIKEN的充气反冲离子分离器GARIS-II后面的飞行中作为聚变蒸发产物获得的。新的直接质量测量作为一个独立的和直接的基准，现有的α-γ光谱数据在这个质量区域。此外，新的质量锚点被设置为U和Np核接近N=126壳层封闭的未来基准的Z=92亚壳层的中子缺乏重同位素。我们的质量结果与以前间接测定的质量值基本一致。连同测量数据，从基态之间的衰变数据链接可能的质量模糊的原因进行了讨论。
The masses of the exotic isotopes Ac210−214 and Ra210−214 have been measured with a multireflection time-of-flight mass spectrograph. These isotopes were obtained in flight as fusion-evaporation products behind the gas-filled recoil ion separator GARIS-II at RIKEN. The new direct mass measurements serve as an independent and direct benchmark for existing α-γ spectroscopy data in this mass region. Further, new mass anchor points are set for U and Np nuclei close to the N=126 shell closure for a future benchmark of the Z=92 subshell for neutron-deficient heavy isotopes. Our mass results are in general in good agreement with the previously indirectly determined mass values. Together with the measurement data, reasons for possible mass ambiguities from decay-data links between ground states are discussed.