# Evidence for a long-lived superheavy nucleus with atomic mass number A=292 and atomic number Z=$\sim$122 in natural Th

Abstract : 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]
Document type :
Preprints, Working Papers, ...

http://hal.in2p3.fr/in2p3-00275768
Contributor : Béatrice Forrler <>
Submitted on : Friday, April 25, 2008 - 11:05:39 AM
Last modification on : Friday, May 8, 2020 - 1:10:07 AM

### Identifiers

• HAL Id : in2p3-00275768, version 1
• ARXIV : 0804.3869

### Citation

A. Marinov, I. Rodushkin, D. Kolb, A. Pape, Y. Kashiv, et al.. Evidence for a long-lived superheavy nucleus with atomic mass number A=292 and atomic number Z=$\sim$122 in natural Th. 2008. ⟨in2p3-00275768⟩

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