Production and decay properties of the 1.9-s isomeric state in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Rf</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>261</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

Haba, Hiromitsu; Kaji, D.; Kikunaga, H.; Kudou, Y.; Morimoto, K.; Morita, Kosuke; Ozeki, Kazutaka; Sumita, T.; Yoneda, Akira; Kasamatsu, Y.; Komori, Yukiko; Ooe, Kazuhiro; Shinohara, Atsushi

doi:10.1103/physrevc.83.034602

Cited by 45 publications

(39 citation statements)

References 27 publications

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“…At the GARIS recoil separator of RIKEN, Haba and coworkers [117,124,125] have successfully synthesized and pre-separated the isotope 265 Sg which is available at a rate of about one atom per hour for chemical investigations [79]. This gave access to detailed nuclear decay studies of the ground-state and the isomeric state of 265 Sg [79] and to the complex decay pattern into two states of 261 Rf [126,127]. These experiments confirmed results from an earlier meta-analysis [215].…”

Section: Gas Phase Chemistrysupporting

confidence: 66%

“…In this most recent development, which constitutes a breakthrough in SHE chemistry, gasfilled magnetic recoil-separators are applied between the target and the recoil chamber -now commonly termed Recoil Transfer Chamber, RTC [116][117][118]. Pioneering work has been performed at the BGS [113,116,119,120] followed by new developments and experiments at the TASCA [110][111][112][121][122][123], the GARIS [117,[124][125][126][127], which had also been used in combination with an IGISOL system before [128], and the DGFRS [129]. A scheme of such a setup, as used at the GARIS, is shown in Fig.…”

Section: Physical Pre-separatorsmentioning

confidence: 99%

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Chemistry of superheavy elements

Schädel

2012

Radiochimica Acta

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Summary. The chemistry of superheavy elements -or transactinides from their position in the Periodic Table -is summarized. After giving an overview over historical developments, nuclear aspects about synthesis of neutron-rich isotopes of these elements, produced in hot-fusion reactions, and their nuclear decay properties are briefly mentioned. Specific requirements to cope with the one-atom-at-a-time situation in automated chemical separations and recent developments in aqueous-phase and gas-phase chemistry are presented. Exciting, current developments, first applications, and future prospects of chemical separations behind physical recoil separators ("pre-separator") are discussed in detail. The status of our current knowledge about the chemistry of rutherfordium (Rf, element 104), dubnium (Db, element 105), seaborgium (Sg, element 106), bohrium (Bh, element 107), hassium (Hs, element 108), copernicium (Cn, element 112), and element 114 is discussed from an experimental point of view. Recent results are emphasized and compared with empirical extrapolations and with fully-relativistic theoretical calculations, especially also under the aspect of the architecture of the Periodic Table.

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Section: Gas Phase Chemistrysupporting

confidence: 66%

Section: Physical Pre-separatorsmentioning

confidence: 99%

Chemistry of superheavy elements

Schädel

2012

Radiochimica Acta

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“…Considerable progress in the experimental synthesis of heaviest nuclei has been achieved recently by the Flerov Laboratory in Dubna [1,2,3,4,5,6,7,8,9,10,11] and was partially confirmed in the laboratories at GSI [12,13,14,15,16], LBNL [17] and RIKEN [18]. Nonetheless, the fundamental question of what is the largest possible atomic number of an atomic nucleus is still unanswered.…”

Section: Introductionmentioning

confidence: 99%

Fission barriers and probabilities of spontaneous fission for elements with Z≥ 100

et al. 2015

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This is a short review of methods and results of calculations of fission barriers and fission halflives of even-even superheavy nuclei. An approvable agreement of the following approaches is shown and discussed: The macroscopic-microscopic approach based on the stratagem of the shell correction to the liquid drop model and a vantage point of microscopic energy density functionals of Skyrme and Gogny type selfconsistently calculated within Hartree-Fock-Bogoliubov method. Mass parameters are calculated in the Hartree-Fock-Bogoliubov cranking approximation. A short part of the paper is devoted to the nuclear fission dynamics. We also discuss the predictive power of Skyrme functionals applied to key properties of the fission path of 266 Hs. It applies the standard techniques of error estimates in the framework of a χ 2 analysis.

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“…It was observed as the α-decay daughter of 265 Sg in decay chains passing through these nuclides. Only recently, evidence for the formation of this second state as an EVR in a heavy-ion induced fusion reaction was obtained [67], and the most complete and most precise values for its production and decay properties were obtained in an experiment at GARIS [93] where EVRs of the 248 Cm( 18 O, 5n) 261 Rf reaction were preseparated in GARIS and transported by a gas-jet to MANON. This second state (often referred to as 261b Rf ) decays by α decay (27 ± 6%) with an α-particle energy of 8.52 ± 0.05 MeV and by SF (73 ± 6%) with a half-life of 1.9 ± 0.4 s [93].…”

Section: Garismentioning

confidence: 99%

“…Only recently, evidence for the formation of this second state as an EVR in a heavy-ion induced fusion reaction was obtained [67], and the most complete and most precise values for its production and decay properties were obtained in an experiment at GARIS [93] where EVRs of the 248 Cm( 18 O, 5n) 261 Rf reaction were preseparated in GARIS and transported by a gas-jet to MANON. This second state (often referred to as 261b Rf ) decays by α decay (27 ± 6%) with an α-particle energy of 8.52 ± 0.05 MeV and by SF (73 ± 6%) with a half-life of 1.9 ± 0.4 s [93]. The production of either of the two states in 261 Rf is equally probable in the 248 Cm( 18 O, 5n) reaction, the total cross section (for both states) was measured to be 23 ± 4 nb [93].…”

Section: Garismentioning

confidence: 99%

Superheavy element studies with preseparated isotopes

Düllmann¹

2011

Radiochimica Acta

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Superheavy elements / Transactinides / Physical preseparation / Recoil separatorSummary. In recent years, significant progress in the field of superheavy element research has been achieved thanks to a novel combination of techniques from different fields. This "physical preseparation" approach includes the coupling of an ancillary setup -typically a chemistry apparatus or a counting setup -to a physical recoil separator. This latter preseparator removes unwanted nuclear reaction products as well as the intense heavy-ion beam associated with superheavy element experiments and thus isolates the evaporation residues of the nuclear fusion reactions. These are guided to the separators's focal plane, where they are extracted and available for further transport to external setups, e.g., by a gas-jet. In this overview, the development of physical preseparation is described, and experimental results from nuclear chemistry and physics that were achieved with "preseparated" isotopes are summarized, with an emphasis on results relevant for superheavy element research. The covered topics range from chemical studies in the liquid as well as in the gas phase, the measurement of nuclear decay properties and of atomic masses. Preseparation was already shown to be a very powerful approach in these studies and promises to allow further progress in superheavy element research.

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Production and decay properties of the 1.9-s isomeric state inRf261

Cited by 45 publications

References 27 publications

Chemistry of superheavy elements

Chemistry of superheavy elements

Fission barriers and probabilities of spontaneous fission for elements with Z≥ 100

Superheavy element studies with preseparated isotopes

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