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Synthesis of rutherfordium isotopes in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">U</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>238</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Mg</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>26</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="italic">xn</mml:mi><mml:mo stretchy="false">)</mml:mo><mml:msup><mml:mi/><mml:mrow><mml:mn>264</mml:mn><mml:mtext>−</mml:mtext><mml:mi>x</mml:mi></mml:mrow></mml:msup><mml:mi mathvariant="normal">Rf</mml:mi></mml:mrow></mml:math>reaction and study of their decay properties

J. M. GatesDepartment of Chemistry, University of California, Berkeley, California 94720-1460, USAMitch A. GarciaNuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USAΚ. Ε. GregorichNuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USACh. E. DüllmannAbteilung Kernchemie, Gesellschaft für Schwerionenforschung mbH, D-64291 Darmstadt, GermanyI. DragojevićDepartment of Chemistry, University of California, Berkeley, California 94720-1460, USAJ. DvořákInstitut für Radiochemie, Technische Universität München, D-85748 Garching, GermanyR. EichlerDepartement für Chemie und Biochemie, Universität Bern, CH-3012 Bern, SwitzerlandC. M. FoldenDepartment of Chemistry, University of California, Berkeley, California 94720-1460, USAW. LovelandDepartment of Chemistry, Oregon State University, Corvallis, Oregon 97331, USAStephen NelsonDepartment of Chemistry, University of California, Berkeley, California 94720-1460, USAG. K. PangDepartment of Chemistry, University of California, Berkeley, California 94720-1460, USAL. StavsetraNuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USARalf SudoweNuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USAΑ. TürlerInstitut für Radiochemie, Technische Universität München, D-85748 Garching, GermanyH. NitscheDepartment of Chemistry, University of California, Berkeley, California 94720-1460, USA

2008lv

ABI

Annotatsiya

Isotopes of rutherfordium ($^{258\ensuremath{-}261}\mathrm{Rf}$) were produced in irradiations of $^{238}\mathrm{U}$ targets with $^{26}\mathrm{Mg}$ beams. Excitation functions were measured for the $4n,5n$, and $6n$ exit channels. Production of $^{261}\mathrm{Rf}$ in the $3n$ exit channel with a cross section of ${28}_{\ensuremath{-}26}^{+92}$ pb was observed. $\ensuremath{\alpha}$-decay of $^{258}\mathrm{Rf}$ was observed for the first time with an $\ensuremath{\alpha}$-particle energy of 9.05 \ifmmode\pm\else\textpm\fi{} 0.03 MeV and an $\ensuremath{\alpha}/$total-decay branching ratio of 0.31 \ifmmode\pm\else\textpm\fi{} 0.11. In $^{259}\mathrm{Rf}$, the electron capture/total-decay branching ratio was measured to be $0.15\ifmmode\pm\else\textpm\fi{}0.04$. The measured half-lives for $^{258}\mathrm{Rf}$, $^{259}\mathrm{Rf}$, and $^{260}\mathrm{Rf}$ were $14.{7}_{\ensuremath{-}1.0}^{+1.2}$ ms, $2.{5}_{\ensuremath{-}0.3}^{+0.4}$ s, and $22.{2}_{\ensuremath{-}2.4}^{+3.0}$ ms, respectively, in agreement with literature data. The systematics of the $\ensuremath{\alpha}$-decay $Q$-values and of the partial spontaneous fission half-lives were evaluated for even-even nuclides in the region of the $N=152,Z=100$ deformed shell. The influence of the $N=152$ shell on the $\ensuremath{\alpha}$-decay $Q$-values for rutherfordium was observed to be similar to that of the lighter elements ($96\ensuremath{\leqslant}Z\ensuremath{\leqslant}102$). However, the $N=152$ shell does not stabilize the rutherfordium isotopes against spontaneous fission, as it does in the lighter elements ($96\ensuremath{\leqslant}Z\ensuremath{\leqslant}102$).

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DOI: 10.1103/physrevc.77.034603

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