Evidence for the existence of long-lived isotopes with atomic mass numbers 261 and 265, and abundance of (1-10)×10^-10 relative to Au, has been found in a study of natural Au using inductively coupled plasma-sector field mass spectrometry. The measured masses match the predictions for the masses of ²⁶¹Rg and ²⁶⁵Rg(Z=111), and those of some isobars of nearby elements. Based on chemical arguments, it is proposed that they are most probably isotopes of Rg. It is deduced that long-lived isomeric states exist in these isotopes. The hypothesis that they belong to a new class of long-lived high spin super- and hyperdeformed isomeric states is discussed.

Dedicated to the late G. W. A. Newton, a colleague and a friend.

Keywords:

PACS: 21.10.-k, 21.10.Dr, 21.10.Tg, 27.90.+b

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