Decay of a πh11/2 ⊗ νh11/2 microsecond isomer in 13661Pm75

被引:13
作者
Rigby, S. V. [1 ]
Cullen, D. M. [1 ]
Mason, P. J. R. [1 ]
Scholes, D. T. [1 ]
Scholey, C. [2 ]
Rahkila, P. [2 ]
Eeckhaudt, S. [2 ]
Grahn, T. [2 ]
Greenlees, P. [2 ]
Jones, P. M. [2 ]
Julin, R. [2 ]
Juutinen, S. [2 ]
Kettunen, H. [2 ]
Leino, M. [2 ]
Leppanen, A. -P. [2 ]
Nieminen, P. [2 ]
Nyman, M. [2 ]
Pakarinen, J. [2 ]
Uusitalo, J. [2 ]
机构
[1] Univ Manchester, Sch Phys & Astron, Schuster Lab, Manchester M13 9PL, Lancs, England
[2] Univ Jyvaskyla, Dept Phys, FIN-40014 Jyvaskyla, Finland
来源
PHYSICAL REVIEW C | 2008年 / 78卷 / 03期
基金
英国工程与自然科学研究理事会; 芬兰科学院;
关键词
D O I
10.1103/PhysRevC.78.034304
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
An experiment has been performed to populate several extremely neutron-deficient nuclei around the mass-140 region of the nuclear chart, using a beam of Fe-54 on a Mo-92 target at an energy of 315 MeV. Analysis of these data using recoil-isomer tagging has established that the yrast pi h(11/ 2) circle times nu h(11/ 2), J(pi) = (8(+)), bandhead state in Pm-136 is isomeric with a half-life of 1.5(1) mu s. This isomeric state decays via a 43-keV, probable-E1 transition to a J(pi) = (7(-)) state. Consideration of the theoretical Nilsson orbitals near the Fermi surface suggests that the J(pi) = (8(+)) state has a nu h(11/ 2)[505]11(-)/2 circle times pi h(11/2)[532]5(-)/2 configuration, which decays to the J(pi) = (7(-)) state with a nu h(11/2)[505]11(-)/2 circle times pi d(5/2)[411]3(+)/2 configuration. Differences in the shape-driving effects for these two configurations is reasoned to be responsible for the long half-life of the J(pi) = (8(+)) isomeric state. The non-observation of other gamma rays in prompt or delayed coincidence with the 43-keV transition suggests that this transition may feed another, longer lived isomeric state with a half-life of the order of milliseconds or greater. However, the present experiment was not sensitive to the decay of this new J(pi) = (7(-)) state by internal conversion or even beta decay.
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页数:7
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