A. Marinov

Semiempirical shell model masses with magic number Z = 126 for superheavy elements

A semiempirical shell model mass equation applicable to superheavy elements up to

EVIDENCE FOR THE POSSIBLE EXISTENCE OF A LONG-LIVED SUPERHEAVY NUCLEUS WITH ATOMIC MASS NUMBER A = 292 AND ATOMIC NUMBER Z ∼ 122 IN NATURAL Th

Z=126

Existence of long-lived isomeric states in naturally-occurring neutron-deficient Th isotopes

is presented and shown to have a high predictive power. The equation is applied to the recently discovered superheavy nuclei

EXISTENCE OF LONG-LIVED ISOTOPES OF A SUPERHEAVY ELEMENT IN NATURAL Au ∗

{}^{293}118

Semiempirical shell model masses with magic number Z = 126 for translead elements with N smaller or equal to 126

and

ENRICHMENT OF THE SUPERHEAVY ELEMENT ROENTGENIUM (Rg) IN NATURAL Au

{}^{289}114

New outlook on the possible existence of superheavy elements in nature

and their decay products.

COHERENT DESCRIPTION FOR HITHERTO UNEXPLAINED RADIOACTIVITIES BY SUPER- AND HYPERDEFORMED ISOMERIC STATES

Evidence for the possible existence of a superheavy nucleus with atomic mass number A = 292 and abundance of about 1×10-12 relative to 232Th has been found in a study of natural Th using inductively coupled plasma-sector field mass spectrometry. The measured mass is different from any species with molecular mass of 292, but it matches the predictions for the mass of an isotope with atomic number Z = 122 or a nearby element. Its deduced half-life of t1/2 ≥ 108 y suggests that a long-lived isomeric state exists in this isotope. The possibility that it might belong to a new class of long-lived high spin super- and hyperdeformed isomeric states is discussed.

Applications of semiempirical shell model masses based on a proton magic numberZ=126to heavy and superheavy nuclei

Four long-lived neutron-deficient Th isotopes with atomic mass numbers 211 to 218 and abundances of (1-10)x10{sup -11} relative to {sup 232}Th have been found in a study of naturally-occurring Th using inductively coupled plasma-sector field mass spectrometry. It is deduced that long-lived isomeric states exist in these isotopes. The hypothesis that they might belong to a new class of long-lived high spin super- and hyperdeformed isomeric states is discussed.

ICP-SFMS search for long-lived naturally-occurring heavy, superheavy and superactinide nuclei compared to AMS experiments

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.