Recoil-α-fission and recoil-α–α-fission events observed in the reaction $^{48}Ca + ^{243}Am$

  title={Recoil-$\alpha$-fission and recoil-$\alpha$–$\alpha$-fission events observed in the reaction \$^\{48\}Ca + ^\{243\}Am\$},
  author={U. Forsberg and D. Rudolph and L-L. Andersson and Antonio Di Nitto and Ch.E. Dullmann and Jacklyn M. Gates and Pavel Golubev and Kenneth E. Gregorich and Carl J Gross and R-D. Herzberg and Fritz Peter Hessberger and J. Khuyagbaatar and Jens Volker Kratz and Krzysztof P. Rykaczewski and L. G. Sarmiento and Mordecai Schadel and A. Yakushev and S. rAberg and D. Ackermann and Michael Block and Holger Brand and B. G. Carlsson and Daniel Cox and X. Derkx and Jacek Jan Dobaczewski and Klaus Eberhardt and Julia Even and C. Fahlander and Juergen Gerl and Edwin W. H. Jager and B. Kindler and J{\"o}rg Krier and Ivan Kojouharov and Nikolaus Kurz and B. Lommel and Andrew Kishor Mistry and Ch. Mokry and Witold Nazarewicz and Heino Nitsche and Jon Petter Omtvedt and Philippos E. Papadakis and I. Ragnarsson and J{\"o}rg Runke and Henning Schaffner and B. Schausten and Y. Shi and Petra Thorle-Pospiech and T. Torres and Telisha Traut and Norbert Trautmann and A. Turler and Andrew Ward and David Ward and Norbert Wiehl},
  journal={Nuclear Physics},

Search for Electron-Capture Delayed Fission in the New Isotope ^{244}Md.

The electron-capture decay followed by a prompt fission process was searched for in the hitherto unknown most neutron-deficient Md isotope with mass number 244, and the origin of eight fission events resulting in a half-life of 5_{-2}^{+3}  ms could not be unambiguously identified within the present data.

Fusion reaction Ca48+Bk249 leading to formation of the element Ts ( Z=117 )

The heaviest currently known nuclei, which have up to 118 protons, have been produced in 48Ca induced reactions with actinide targets. Among them, the element tennessine (Ts), which has 117 protons,

Low-lying states in Ra219 and Rn215 : Sampling microsecond α -decaying nuclei

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$\beta$β(EC) delayed fission in the heaviest nuclei

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Search for elements 119 and 120

A search for production of the superheavy elements with atomic numbers 119 and 120 was performed in the Ti50+Bk249 and Ti50+Cf249 fusion-evaporation reactions, respectively, at the gas-filled recoil

Analysis of decay chains of superheavy nuclei produced in the 249Bk+48Ca and 243Am+48Ca reactions

The analysis of decay chains starting at superheavy nuclei 293Ts and 289Mc is presented. The spectroscopic properties of nuclei identified during the experiments using the 249Bk+48Ca and 243Am+48Ca

First Direct Measurements of Superheavy-Element Mass Numbers.

This experiment represents the first direct measurements of the mass numbers of superheavy elements, confirming previous (indirect) mass-number assignments.

Synthesis and properties of isotopes of the transactinides

Abstract Isotopes of transactinide elements have to be synthesized in nuclear reactions with light or heavy beam particles. The efficient production by neutron capture and subsequent β− decay as it

How elements up to 118 were reached and how to go beyond

The new superheavy elements with Z=113, 115, 117, and 118 were recently accepted into the periodic table and have been named. Elements with Z≥112 are predominantly produced in 48 Ca-induced fusion



48Ca+249Bk fusion reaction leading to element Z = 117: long-lived α-decaying 270Db and discovery of 266Lr.

The superheavy element with atomic number Z=117 was produced as an evaporation residue in the (48)Ca+(249)Bk fusion reaction at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany and a hitherto unknown α-decay branch in (270)Db was observed, which populated the new isotope (266)Lr.

First Superheavy Element Experiments at the GSI Recoil Separator TASCA: The Production and Decay of Element 114 in the 244Pu(48Ca,3-4n) Reaction

Experiments with the new recoil separator, Transactinide Separator and Chemistry Apparatus (TASCA), at the GSI were performed by using beams of Ca-48 to irradiate targets of Pb206-208, which led to

Production and decay of element 114: high cross sections and the new nucleus 277Hs.

The fusion-evaporation reaction 244Pu(48Ca,3-4n){288,289}114 was studied at the new gas-filled recoil separator TASCA and a previously unobserved α branch in 281Ds was observed (probability to be of random origin from background: 0.1%).

New insights into the 243Am + 48Ca reaction products previously observed in the experiments on elements 113, 115, and 117.

Results of a new series of experiments on the study of production cross sections and decay properties of the isotopes of element 115 in the reaction (243)Am+(48)Ca are presented, registering the product of the 2n-evaporation channel, (289)115, for the first time.

Alpha-Photon Coincidence Spectroscopy Along Element 115 Decay Chains

Produced in the reaction 48Ca+243Am, thirty correlated α-decay chains were observed in an experiment conducted at the GSI Helmholzzentrum fur Schwerionenforschung, Darmstadt, Germany. The decay

Selected spectroscopic results on element 115 decay chains

Abstract Thirty correlated α-decay chains were observed in an experiment studying the fusion-evaporation reaction 48Ca + 243Am at the GSI Helmholtzzentrum für Schwerionenforschung. The decay

Spontaneous fission modes and lifetimes of superheavy elements in the nuclear density functional theory

Background: The reactions with the neutron-rich 48Ca beam and actinide targets resulted in the detection of new superheavy (SH) nuclides with Z=104 118. The unambiguous identification of the new


Decay properties and stability of heaviest nuclei with Z≤132 are studied within the macro-microscopical approach for nuclear ground state masses and phenomenological relations for the half-lives with

Structure of Superheavy Nuclei Along Decay Chains of Element 115

A recent high-resolution α, X-ray, and γ-ray coincidence-spectroscopy experiment offered the first glimpse of excitation schemes of isotopes along α-decay chains of Z=115. To understand these

Predictions of the FBD model for the synthesis cross sections of Z = 114-120 elements based on macroscopic-microscopic fission barriers

A complete set of existing data on hot fusion reactions leading to synthesis of superheavy nuclei of Z =114-118, obtained in a series of experiments in Dubna and later in GSI Darmstadt and LBNL