20 mu s isomeric state in doubly odd Pm-134(61)
20 mu s isomeric state in doubly odd Pm-134(61)
复制标题
双奇数 Pm-134(61) 的 20 mu s 异构态
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
M. Venhart
中科院分区：
文献类型：
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作者：
D. Cullen;P. Mason;S. Rigby;C. Scholey;S. Eeckhaudt;T. Grahn;P. Greenlees;U. Jakobsson;P. Jones;R. Julin;S. Juutinen;S. Ketelhut;A. Kishada;M. Leino;A. Leppänen;K. Mäntyniemi;P. Nieminen;M. Nyman;J. Pakarinen;P. Peura;P. Rahkila;J. Sarén;J. Sorri;J. Uusitalo;B. Varley;M. Venhart
Recoil-isomer tagging at the Accelerator Laboratory of the University of Jyvaumlskylauml has been used to establish the isomeric nature of a known (7(-)) excited state in the doubly odd nucleus Pm-134. The isomeric state was determined to have a half-life of 20(1) mu s and was populated from the decay of a pi h(11/2)circle times nu h(11/2) band using the Mo-92(Fe-54,2 alpha 3pn) reaction at 305 and 315 MeV. The isomer decays by a 71-keV transition that provides an intermediate step in linking the established Pm-134 high-spin level scheme to the lower-spin states observed from the beta decay of Sm-134. Electron-conversion analysis for the 71-keV gamma-ray transition reveals that it is of E1 character and its small reduced-transition probability suggests that Pm-134 may have a nuclear shape more rigid than that of the neighboring nuclei.
