Blurring the boundaries: decays of multiparticle isomers at the proton drip line.
Blurring the boundaries: decays of multiparticle isomers at the proton drip line.
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DOI：
10.1103/physrevlett.112.092501
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发表时间：
2014-03
影响因子：
8.6
通讯作者：
R. Carroll;R. Page;D. Joss;J. Uusitalo;I. Darby;K. Andgren;B. Cederwall;S. Eeckhaudt;T. Grahn;C. Gray-Jones;P. Greenlees;B. Hadinia;P. Jones;R. Julin;S. Juutinen;M. Leino;A. Leppänen;M. Nyman;D. O’Donnell;J. Pakarinen;P. Rahkila;M. Sandzelius;J. Sarén;C. Scholey;D. Seweryniak;J. Simpson
中科院分区：
文献类型：
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作者：
R. Carroll;R. Page;D. Joss;J. Uusitalo;I. Darby;K. Andgren;B. Cederwall;S. Eeckhaudt;T. Grahn;C. Gray-Jones;P. Greenlees;B. Hadinia;P. Jones;R. Julin;S. Juutinen;M. Leino;A. Leppänen;M. Nyman;D. O’Donnell;J. Pakarinen;P. Rahkila;M. Sandzelius;J. Sarén;C. Scholey;D. Seweryniak;J. Simpson
在质子非束缚核（73）（158）Ta85中发现了多粒子自旋阱异构体。该异构体主要通过γ射线发射进行衰变，半衰期为6.1 μs， γ射线数据分析表明，该异构体位于已知9+态以上2668 keV，自旋高10 μ，偶对为负。这个19-同分异构体也有一个8644(11)keV, 1.4(2)% α-衰变分支，位于（154）Lu中的9+态。尽管该异构体与3261(14)keV的质子发射没有结合，但没有发现来自该异构体的质子衰变分支。这种对质子发射的显著稳定性与理论预测进行了比较，并考虑了可观测核素范围的含义。
A multiparticle spin-trap isomer has been discovered in the proton-unbound nucleus (73)(158)Ta85 . The isomer mainly decays by γ-ray emission with a half-life of 6.1(1) μs. Analysis of the γ-ray data shows that the isomer lies 2668 keV above the known 9+ state and has a spin 10ℏ higher and negative parity. This 19- isomer also has an 8644(11) keV, 1.4(2)% α-decay branch that populates the 9+ state in (154)Lu. No proton-decay branch from the isomer was identified, despite the isomer being unbound to proton emission by 3261(14) keV. This remarkable stability against proton emission is compared with theoretical predictions, and the implications for the extent of observable nuclides are considered.