Elsevier

Nuclear Physics A

Volume 148, Issue 1, 8 June 1970, Pages 249-272
Nuclear Physics A

Studies of the α-active isotopes of mercury, gold and platinum

https://doi.org/10.1016/0375-9474(70)90622-6Get rights and content

Abstract

Neutron-deficient isotopes of mercury were produced by isotope-separation-on-line techniques. Alpha-emission was established from all mass numbers 179–187. The α-decay energies were measured, as were the half-lives except for 179Hg. Fine structure in the α-spectra was observed in 6 cases. The partial α-lifetime was determined for 11α-transitions from mercury isotopes.

The α-decay was also studied for isotopes of gold and platinum, which were found as daughters of the mercury isotopes. Previous assignments of α-decay energies and half-lives to mass numbers were confirmed. Alpha-emission was found for the first time from 184Au and, tentatively, from 182Au. Fine structure was seen in the α-spectra from 184Au, 178Pt and 177Pt. The α-lifetime was determined for 9 transitions from isotopes of gold and platinum.

The measured α-decay energies were compared to recent mass calculations. The energy of the first excited 2+ level was determined in the even nuclei 180Pt (159 ± 5 keV), 178Pt (169 ± 5 keV) and 174Os (152 ± 5 keV). A systematic dependence of α-transition rates on neutron and proton number is pointed out.

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    Address 1969–1970: CERN, Geneva, Switzerland.

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