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

被引：14

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：

芬兰科学院; 英国工程与自然科学研究理事会;

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.

引用

页数：7

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