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Claes Fahlander

Professor emeritus

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Search for elements 119 and 120

Author

  • J. Khuyagbaatar
  • A. Yakushev
  • Ch. E. Düllmann
  • D. Ackermann
  • L.-L. Andersson
  • M. Asai
  • M. Block
  • R.A. Boll
  • H. Brand
  • D. M. Cox
  • M. Dasgupta
  • X. Derkx
  • A. Di Nitto
  • K. Eberhardt
  • J. Even
  • M. Evers
  • C. Fahlander
  • U. Forsberg
  • J. M. Gates
  • N. Gharibyan
  • P. Golubev
  • K. E. Gregorich
  • J. H. Hamilton
  • W. Hartmann
  • R.-D. Herzberg
  • F. P. Heßberger
  • D. J. Hinde
  • J. Hoffmann
  • R. Hollinger
  • A. Hübner
  • E. Jäger
  • B. Kindler
  • J.V. Kratz
  • J. Krier
  • N. Kurz
  • M. Laatiaoui
  • S. Lahiri
  • R. Lang
  • B. Lommel
  • M. Maiti
  • K. Miernik
  • S. Minami
  • A. K. Mistry
  • C. Mokry
  • H. Nitsche
  • J. P. Omtvedt
  • G. K. Pang
  • P. Papadakis
  • D. Renisch
  • J. B. Roberto
  • D. Rudolph
  • J. Runke
  • K. P. Rykaczewski
  • Luis Sarmiento Pico
  • M. Schädel
  • B. Schausten
  • A. Semchenkov
  • D. A. Shaughnessy
  • P. Steinegger
  • J. Steiner
  • E. E. Tereshatov
  • P. Thörle-Pospiech
  • K. Tinschert
  • T. Torres De Heidenreich
  • N. Trautmann
  • A. Türler
  • J. Uusitalo
  • M. Wegrzecki
  • N. Wiehl
  • S. M. Van Cleve
  • V. Yakusheva
Show all

Summary, in English

A search for production of the superheavy elements with atomic numbers 119 and 120 was performed in the 50Ti+249Bk and 50Ti+249Cf fusion-evaporation reactions, respectively, at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. Over four months of irradiation, the 249Bk target partially decayed into 249Cf, which allowed for a simultaneous search for both elements. Neither was detected at cross-section sensitivity levels of 65 and 200 fb for the 50Ti+249Bk and 50Ti+249Cf reactions, respectively, at a midtarget beam energy of Elab = 281.5 MeV. The nonobservation of elements 119 and 120 is discussed within the concept of fusion-evaporation reactions including various theoretical predictions on the fission-barrier heights of superheavy nuclei in the region of the island of stability.

Department/s

  • Nuclear physics

Publishing year

2020-12-02

Language

English

Publication/Series

Physical Review C

Volume

102

Issue

6

Document type

Journal article

Publisher

American Physical Society

Topic

  • Subatomic Physics

Keywords

  • superheavy elements
  • element 119
  • element 120
  • Production cross section

Status

Published

Project

  • Element 115
  • Nuclear Structure at the Limits: Isotope-selective Spectroscopy

ISBN/ISSN/Other

  • ISSN: 2469-9985