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Evidence for a long-lived superheavy nucleus with atomic mass number A=292 and atomic number Z=$\sim$122 in natural Th
A. Marinov, I. Rodushkin, D. Kolb, A. Pape1, Y. Kashiv, R. Brandt, R.V. Gentry, H.W. Miller

Evidence for the existence of a superheavy nucleus with atomic mass number A=292 and abundance (1-10)x10^(-12) relative to ^{232}Th has been found in a study of natural Th using inductively coupled plasma-sector field mass spectrometry. The measured mass matches the predictions [1,2] for the mass of an isotope with atomic number Z=122 or a nearby element. Its estimated half-life of t1/2 >= 10^8 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.[3-6]
1 :  DRS-IPHC - Département Recherches Subatomiques
Physique/Physique Nucléaire Expérimentale
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