αdecay of theπh11/2isomer inIr164

M. C. Drummond,D. O'Donnell,R. D. Page,D. T. Joss,L. Capponi,D. M. Cox,I. G. Darby, L. Donosa, F. Filmer,T. Grahn,P. T. Greenlees,K. Hauschild,A. Herzan,U. Jakobsson,P. M. Jones,R. Julin,S. Juutinen,S. Ketelhut, M. Leino,A. Lopez-Martens,A. K. Mistry,P. Nieminen,P. Peura,P. Rahkila,S. Rinta-Antila,P. Ruotsalainen,M. Sandzelius, J. Sarén,B. Sayğı,C. Scholey,J. Simpson, J. Sorri, A. Thornthwaite,J. Uusitalo

PHYSICAL REVIEW C（2014）

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摘要

The alpha-decay branch of the pi h(11/2) isomer in Ir-164 has been identified using the GREAT spectrometer. The Ir-164 nuclei were produced using the Mo-92(Kr-78, p5n)Ir-164 reaction and separated in flight using the recoil ion transport unit (RITU) gas-filled separator. The measured alpha-decay energy of 6880 +/- 10 keV allowed the excitation of the pi h(11/2) state in Re-160 to be deduced as 166 +/- 14 keV. The half-life of Ir-164 was measured with improved precision to be 70 +/- 10 mu s and an alpha-decay branching ratio of 4 +/- 2% was determined. Improved half-life and branching ratio measurements were also obtained for Ir-165, but no evidence was found for the ground-state decays of either Ir-164 or Ir-165.

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