Article

New isotope<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Sg</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>264</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>and decay properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mi mathvariant="normal">Sg</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>262</mml:mn><mml:mo>−</mml:mo><mml:mn>264</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>

Κ. Ε. GregorichNuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USAJ. M. GatesDepartment of Chemistry, University of California, Berkeley, California 94720, USACh. E. DüllmannGesellschaft für Schwerionenforschung, D-64291 Darmstadt, GermanyRalf SudoweNuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USAStephen NelsonDepartment of Chemistry, University of California, Berkeley, California 94720, USAMitch A. GarciaDepartment of Chemistry, University of California, Berkeley, California 94720, USAI. DragojevićDepartment of Chemistry, University of California, Berkeley, California 94720, USAC. M. FoldenNational Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USAS. NeumannDepartment of Applied Sciences and Technology, Aachen University of Applied Sciences, D-52428 Jülich, GermanyDarleane C. HoffmanDepartment of Chemistry, University of California, Berkeley, California 94720, USAH. NitscheDepartment of Chemistry, University of California, Berkeley, California 94720, USA

2006lv

ABI

Abstract

New isotope, $^{264}\mathrm{Sg}$, was identified using the $^{238}\mathrm{U}$($^{30}\mathrm{Si}$, x$n$)$^{268\ensuremath{-}x}\mathrm{Sg}$ reaction and excitation functions for $^{262\ensuremath{-}264}\mathrm{Sg}$ were measured. $^{264}\mathrm{Sg}$ decays by spontaneous fission with a half-life of ${37}_{\ensuremath{-}11}^{+27}$ ms. The spontaneous fission branch for 0.9-s $^{263}\mathrm{Sg}$ was measured for the first time and found to be (13\ifmmode\pm\else\textpm\fi{}8)%. $^{262}\mathrm{Sg}$ decays by spontaneous fission with a ${15}_{\ensuremath{-}3}^{+5}$ ms half-life. Spontaneous fission partial half-life systematics are evaluated for even-even Sg isotopes from $^{258}\mathrm{Sg}$ through $^{266}\mathrm{Sg}$, spanning the transition region between the $N=152,Z=100$ and $N=162,Z=108$ deformed shells.

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Identifiers

DOI: 10.1103/physrevc.74.044611

Citations and references

Cited by 30 references

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