First superheavy element experiments at the GSI recoil separator TASCA: The production and decay of element 114 in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Pu</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>244</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">Ca</mml:mi><mml:mprescripts /><mml

Gates, J. M.; Düllmann, Ch. E.; Schädel, M.; Yakushev, A.; Türler, Α.; Eberhardt, Κ.; Kratz, Jens Volker; Ackermann, D.; Andersson, L.-L.; Block, M.; Brüchle, W.; Dvořák, J.; Essel, H.G.; Ellison, Paul A.; Even, J.; Forsberg, U.; Gellanki, J.; Gorshkov, A.; Graeger, R.; Gregorich, Κ. Ε.; Hartmann, W.; Herzberg, R.‐D.; Heßberger, F. P.; Hild, D.; Hübner, A.; Jäger, E.; Khuyagbaatar, J.; Kindler, B.; Krier, J.; Kurz, N.; Lahiri, Susanta; Liebe, D.; Lommel, B.; Maiti, Moumita; Nitsche, H.; Omtvedt, J. P.; Parr, E.; Rudolph, Dirk; Runke, J.; Schaffner, H.; Schausten, Β.; Schimpf, E.; Semchenkov, A.; Steiner, J.; Thörle-Pospiech, P.; Uusitalo, J.; Węgrzecki, M.; Wiehl, N.

doi:10.1103/physrevc.83.054618

Cited by 154 publications

(86 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a first step towards a chemistry experiment with element 114 at TASCA, production and decay of element 114 in the 244 Pu( 48 Ca, 3 − 4n) 288,289 114 reaction was studied [50,51]. The obtained results confirmed the nuclear properties as reported from experiments at the DGFRS [74], and the experiment also verified the superior performance of TASCA for the subsequent chemical study of element 114.…”

Section: Gas Phase Chemical Studies Of Element 114supporting

confidence: 69%

“…The solid angle is 13.3 msr [49], which is significantly larger than, e.g., the 10 msr of the Dubna Gas-Filled Recoil Separator (DGFRS). The efficiency of TASCA for actinide-target based 48 Cainduced fusion reactions [50,51] is roughly 50% larger than that of the DGFRS and approaches the best values reported from the BGS [52]. TASCA thus combines the advantages of these two separators, i.e., the large transmission of the BGS and the small dispersion of the DGFRS.…”

Section: Formation Of the Community Building And Commissioning Of Tascamentioning

confidence: 91%

See 1 more Smart Citation

Superheavy element studies with preseparated isotopes

Düllmann¹

2011

Radiochimica Acta

View full text Add to dashboard Cite

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.

show abstract

Section: Gas Phase Chemical Studies Of Element 114supporting

confidence: 69%

Section: Formation Of the Community Building And Commissioning Of Tascamentioning

confidence: 91%

Superheavy element studies with preseparated isotopes

Düllmann¹

2011

Radiochimica Acta

View full text Add to dashboard Cite

show abstract

“…It confirmed the synthesis of the two most neutron-rich isotopes of element 114, 0.69-s 288 114 and 2.1-s 289 114 [37]. Moreover, it showed that these two isotopes are produced with a cross section of the order of 10 pb [38] -the highest cross section observed in 48 Ca induced production of transactinides. These nuclei have longer half-lives and are produced with much higher cross sections than the ones in cold fusion reactions, thus providing great perspectives for chemical studies.…”

Section: Introduction and Historical Remarkssupporting

confidence: 62%

“…Both lead to stable operation at beam currents of often more than 1 µA (particle). Separator efficiencies of about 60% for element 114 produced in the 48 Ca on 244 Pu reaction at TASCA [130] and still 13% for 265 Sg synthesized in the very asymmetric 22 Ne on 248 Cm reaction at GARIS [79] have been reached.…”

Section: Physical Pre-separatorsmentioning

confidence: 87%

“…Consequently, three to five neutrons are emitted before the compound nucleus has cooled. Still, because of the neutron-richness of actinides targets, these reactions yield the more neutron-rich, rela- tively long-lived isotopes used in chemical investigations of SHE; see Table 2 for used nuclides and [25,32,37,38,60,78,79] for more details.…”

Section: Nuclear Syntheses and Decaysmentioning

confidence: 99%

See 1 more Smart Citation

Chemistry of superheavy elements

Schädel

2012

Radiochimica Acta

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Electronic Structure of the Transactinide Atoms

Eliav

Kaldor

Borschevsky

2018

Encyclopedia of Inorganic and Bioinorganic Chemistry

View full text Add to dashboard Cite

Electronic structure and atomic properties of the transactinide or superheavy elements (SHEs) are reviewed. The properties of interest include electronic configurations of the ground states, ionization potentials, electron affinities, and excitation energies, which are associated with the spectroscopic and chemical behavior of these elements, and are therefore of considerable interest. Accurate predictions of these quantities require high‐order inclusion of relativity and electron correlation on equal footing. The four‐component Dirac–Coulomb–Breit Hamiltonian serves as the framework for the treatment, to include all terms up to second order in the fine‐structure constant α . Electron correlation is treated by the state‐of‐art relativistic Fock‐space coupled‐cluster method. The quality of the calculations is assessed by applying the same methods to lighter homologs, where the experimental information is available. This comparison shows very good agreement, within a few hundredths of an electronvolt, and similar accuracy is expected for the SHEs. Many of the properties predicted for the SHEs differ significantly from what may be expected by straightforward extrapolation of lighter homologies, demonstrating that the structure and chemistry of SHEs are strongly affected by relativity, making determination of their place in the Periodic Table a challenge.

show abstract

First superheavy element experiments at the GSI recoil separator TASCA: The production and decay of element 114 in thePu244(Ca

Abstract: Experiments with the new recoil separator, TASCA, at the GSI were performed using beams of 48 Ca to irradiate targets of [206][207][208] Pb leading to the production of [252][253][254]

Cited by 154 publications

References 51 publications

Superheavy element studies with preseparated isotopes

Superheavy element studies with preseparated isotopes

Chemistry of superheavy elements

Electronic Structure of the Transactinide Atoms

Contact Info

Product

Resources

About