J. Krier

Reactivity and volatility of astatine in a quartz column

Dominik Dietzel, A. Yakushev, Ch. E. Düllmann, Katharina Hermainski et autres

Abstract Astatine (At, Z = 85) is the rarest naturally occurring element and exhibits unique chemical properties influenced by relativistic effects. The short half-lives of its isotopes and its scarcity limits chemical experiments and methods to study and work with astatine. While …

de, cz, no (code pays fourni par la source)

Probing the Shell Effects on Fission: The New Superheavy Nucleus Sg 257

P. Mošať, J. Khuyagbaatar, J. Ballof, R. A. Cantemir et autres

Decay properties of the neutron-deficient Sg isotopes were studied at the gas-filled recoil separator TASCA at GSI, Darmstadt by using the ^{52}Cr+^{206,208}Pb reactions. We report on the discovery of the new isotope ^{257}Sg. Its ground state, tentatively assigned to have 9/2^{-}[734] configuration, …

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Decay properties of the neutron-deficient isotope Es242

J. Khuyagbaatar, R. A. Cantemir, Ch. E. Düllmann, E. Jäger et autres

The radioactive decay properties of $^{242}\mathrm{Es}$ were studied at the gas-filled recoil separator TASCA. This isotope was produced in the $3n$ evaporation channel of the fusion reaction of $^{48}\mathrm{Ca}+^{197}\mathrm{Au}$. A half-life of 16.9(8) s was deduced from 662 $\ensuremath{\alpha}$ decays of $^{242}\mathrm{Es}$, …

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Spectroscopy along flerovium decay chains. II. Fine structure in odd- A Fl289

D. M. Cox, A. Såmark-Roth, D. Rudolph, L. G. Sarmiento et autres

Fifteen correlated $\ensuremath{\alpha}$-decay chains starting from the odd-$A$ superheavy nucleus $^{289}\mathrm{Fl}$ were observed following the fusion-evaporation reaction $^{48}\mathrm{Ca}+^{244}\mathrm{Pu}$. The results call for at least two parallel $\ensuremath{\alpha}$-decay sequences starting from at least two different states of $^{289}\mathrm{Fl}$. This implies that close-lying levels …

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Spectroscopy along flerovium decay chains. III. Details on experiment, analysis, Cn282 , and spontaneous fission branches

A. Såmark-Roth, D. M. Cox, D. Rudolph, L. G. Sarmiento et autres

Flerovium isotopes (element $Z=114$) were produced in the fusion-evaporation reactions $^{48}\mathrm{Ca}+^{242,244}\mathrm{Pu}$ and studied with an upgraded TASISpec decay station placed in the focal plane of the gas-filled separator TASCA at the GSI Helmholtzzentrum f\"ur Schwerionenforschung in Darmstadt, Germany. Twenty-nine flerovium decay chains …

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Search for fission from a long-lived isomer in No250 and evidence of a second isomer

J. Khuyagbaatar, H.S. Brand, Ch. E. Düllmann, F. P. Heßberger et autres

In the present work, a $K$ isomeric state in $^{250}\mathrm{No}$, which is more stable against fission than the ground state, was experimentally studied. The aim was to measure the fission branch of this isomeric state. In total, 780 fission events attributed to …

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Spontaneous fission instability of the neutron-deficient No and Rf isotopes: The new isotope No249

J. Khuyagbaatar, H.S. Brand, R. A. Cantemir, Ch. E. Düllmann et autres

In the heaviest elements, the instability of atomic nuclei against spontaneous fission leads to ever shorter nuclear half-lives. Upon falling below a timescale of ${10}^{\ensuremath{-}14}$ s, the border of existence of isotopes is crossed because this is the timescale on which the …

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Isomeric states in Rf256

J. Khuyagbaatar, H.S. Brand, R. A. Cantemir, Ch. E. Düllmann et autres

The question of the number and origin of isomeric states in $^{256}\mathrm{Rf}$ arose from two independent experiments but remained unanswered for a decade. To shed light on this puzzle, we studied isomeric decay in $^{256}\mathrm{Rf}$ by measuring conversion electrons with fast fully …

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Evolution of the Ice Shell of Enceladus Including Expansion Due to Freezing

J. Krier, J. H. Roberts

Spectroscopy along Flerovium Decay Chains: Discovery of Ds280 and an Excited State in Cn282

A. Såmark-Roth, D. M. Cox, D. Rudolph, L. G. Sarmiento et autres

A nuclear spectroscopy experiment was conducted to study α-decay chains stemming from isotopes of flerovium (element Z=114). An upgraded TASISpec decay station was placed behind the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, Germany. The fusion-evaporation reactions ^{48}Ca+^{242}Pu …

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Search for elements 119 and 120

J. Khuyagbaatar, A. Yakushev, Ch. E. Düllmann, D. Ackermann et autres

A search for production of the superheavy elements with atomic numbers 119 and 120 was performed in the $^{50}\mathrm{Ti}+^{249}\mathrm{Bk}$ and $^{50}\mathrm{Ti}+^{249}\mathrm{Cf}$ fusion-evaporation reactions, respectively, at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. Over four months of irradiation, the $^{249}\mathrm{Bk}$ target …

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Spectroscopic Tools Applied to Flerovium Decay Chains

D. M. Cox, A. Såmark-Roth, D. Rudolph, L. G. Sarmiento et autres

Abstract An upgraded TASISpec setup, with the addition of a veto DSSD and the new Compex detector-germanium array, has been employed with the gas-filled recoil separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung Darmstadt, to study flerovium (element 114) decay chains. The …

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