The new element 111

  title={The new element 111},
  author={Sigurd Hofmann and Vasil Ninov and Fritz Peter Hessberger and Peter Armbruster and H. Folger and Gottfried M{\"u}nzenberg and H. J. Sch{\"o}tt and A. G. Popeko and A. V. Yeremin and A. N. Andreyev and {\vS}. {\vS}{\'a}r{\'o} and Rudolf Janik and Matti Leino},
  journal={Zeitschrift f{\"u}r Physik A Hadrons and Nuclei},
The new element 111 was produced and unambiguously identified in an experiment at SHIP, GSI Darmstadt. Three nuclei of the isotope272111 were observed in irradiations of209Bi targets with64Ni projectiles of 318 MeV and 320 MeV energy. The cross-sections are (1.7−1.4+3.3) pb and (3.5−2.3+4.6) pb, respectively. The nuclei decay by a emission into the new and so far the heaviest isotopes of the elements 109 and 107 with mass numbers A=268 and A=264. Theα-decay chains were followed down to the… 
Experiment on the Synthesis of Element 113 in the Reaction 209Bi(70Zn,n)278113
The convincing candidate event of the isotope of the 113th element, 278 113, and its daughter nuclei, 274 111 and 270 Mt, were observed, for the first time, in the 209 Bi + 70 Zn reaction at a beam
Heavy and superheavy nuclei
The new elements 110, 111 and 112 were synthesized and unambiguously identified in experiments at SHIP. Due to strong shell effects the dominant decay mode is not fission, but emission of alpha
Production and decay properties of 272111 and its daughter nuclei
The production and decay of 272 111 has been investigated using a gas-filled recoil ion separator in irradiations of 209 Bi targets with 64 Ni beam at 320, 323 and 326 MeV. We have observed 14
Structure of the new nuclide (259)Db and its alpha-decay daughter nuclei
The structure of the new nuclides discovered recently in the Am-241(Ne-22,4n) reaction, (259)Db, and its alpha-decay chain are systematically studied in the relativistic mean field (RMF) approach
Review of even element super-heavy nuclei and search for element 120
Abstract.The reaction 54Cr$ + $248Cm was investigated at the velocity filter SHIP at GSI, Darmstadt, with the intention to study production and decay properties of isotopes of element 120. Three
Development of an odd-Z-projectile reaction for heavy element synthesis: 208Pb(64Ni,n)271Ds and 208Pb(65Cu,n)(272)111.
This experiment confirms the discovery of element 111 by the Darmstadt Group who used the 209Bi(64Ni,n)(272)111 reaction and an optimum energy of 321 MeV was estimated for the production of (272) 111 in the new reaction 208Pb(65Cu,n).
Heavy element research at GSI — Recent results and perspectives
The nuclear shell model predicts that the next doubly magic shellclosure beyond 208Pb is at a proton number between Z=114 and 126 and at a neutron number N=184. The outstanding aim of experimental
The Discovery of Superheavy Elements 107–112 and of the Deformed Shell at N = 162
The production of radioactive elements at GSI Darmstadt during the last 20 years is reviewed. The development of highly sensitive separation and identification methods lead to the synthesis of
Discovery of new element, nihonium, and perspectives (PLENARY)
A new element 113 was searched by the reaction of Zn on Bi using a gas-filled recoil ion separator at the RIKEN linear accelerator facility. Totally three decay chains due to 113 were observed. The
Experiment on synthesis of an isotope277112 by208Pb + 70Zn reaction
The production and decay of 277 112 have been investigated using a gas-filled recoil ion separator in irradiations of 208 Pb targets with a 70 Zn beam at 349.5 MeV. We have observed two α-decay


The isotopes259106,260106, and261106
In irradiations of207Pb and208Pb, respectively, with54Cr theα-decay of the isotopes259106,260106, and261106 could be observed for the first time. For260106 a spontaneous fission branch of (50−20+30)%
Discovery of enhanced nuclear stability near the deformed shells N=162 and Z=108.
The decay properties of [sup 266]106 establish the existence of enhanced nuclear stability near the predicted deformed shells [ital N]=162 and [ital Z]=108, and estimated SF branches of 50% or less for both isotopes.
On the Production of Heavy Elements by Cold Fusion: The Elements 106 to 109
The production of isotopes of elements 106 through 109 is considered. Techniques involving heavy ion fusion reactions are discussed including shell corrections, cross sections, velocity separators.
Stability of heavy and superheavy elements
We review several important experimental and theoretical developments that during the past decade have revived interest in the stability properties of the heaviest elements. On the experimental side
Two new $\ensuremath{\alpha}$-emitting isotopes of element 105 with mass numbers 261 and 262 have been discovered. The 8.93-MeV 1.8-sec $^{261}\mathrm{Ha}$ was produced by the reactions
GSI Nachrichten 11-94, Nov. 1994 and to be published
  • GSI Nachrichten 11-94, Nov. 1994 and to be published