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alpha decay of the pi h(11/2) isomer in Ir-164

Abstract : 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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Contributor : Christine Hadrossek <>
Submitted on : Thursday, August 28, 2014 - 2:58:22 PM
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M. C. Drummond, D. O'Donnell, R. D. Page, D. T. Joss, L. Capponi, et al.. alpha decay of the pi h(11/2) isomer in Ir-164. Physical Review C, American Physical Society, 2014, 89, pp.064309. ⟨10.1103/PhysRevC.89.064309⟩. ⟨in2p3-01058882⟩



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