4.4 Article

The new isotope 179Pb and α-decay properties of 179Tlm

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Publisher

IOP PUBLISHING LTD
DOI: 10.1088/0954-3899/37/3/035102

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Funding

  1. FWO-Vlaanderen (Belgium) [GOA/2004/03]
  2. 'Interuniversity Attraction Poles Programme-Belgian State Belgian Science Policy' [P6/23]
  3. European Commission [RII3-CT-2004-506065]
  4. UK Science and Technology Facilities Council
  5. Slovak Research and Development Agency [APVV-20-006205]
  6. Science and Technology Facilities Council [ST/H009035/1, ST/I002723/1, ST/F012039/1, ST/G008671/1, EP/C015266/1] Funding Source: researchfish
  7. STFC [EP/C015266/1, ST/G008671/1, ST/H009035/1, ST/F012039/1, ST/I002723/1] Funding Source: UKRI

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The new isotope Pb-179 has been produced in the complete fusion reaction Ca-40+Sm-144 -> Pb-179+5n at the velocity filter SHIP (GSI). Its alpha-decay energy of 7350(20) keV and half-life value of 3.5(-0.8)(+1.4) ms were deduced based on the recoil-alpha-alpha correlation technique. A spin parity of I-pi = (9/2(-)) was tentatively assigned to the ground state of Pb-179; thus, it is based on the 1h(9/2) orbital. Improved measurements of the alpha-decay properties of Tl-179(m) and Au-175(m) are also presented.

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