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Isomers in neutron-rich A approximate to 190 nuclides from Pb-208 fragmentation

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Author

  • M Caamano
  • PM Walker
  • PH Regan
  • M Pfutzner
  • Z Podolyak
  • J Gerl
  • Margareta Hellström
  • P Mayet
  • Milena Mineva
  • A Aprahamian
  • J Benlliure
  • AM Bruce
  • PA Butler
  • DC Gil
  • DM Cullen
  • J Doring
  • T Enqvist
  • C Fox
  • JG Narro
  • H Geissel
  • W Gelletly
  • J Giovinazzo
  • M Gorska
  • H Grawe
  • R Grzywacz
  • A Kleinbohl
  • W Korten
  • M Lewitowicz
  • R Lucas
  • H Mach
  • CD O'Leary
  • F De Oliveira
  • CJ Pearson
  • F Rejmund
  • M Rejmund
  • M Sawicka
  • H Schaffner
  • C Schlegel
  • K Schmidt
  • KH Schmidt
  • PD Stevenson
  • C Theisen
  • F Vives
  • DD Warner
  • C Wheldon
  • HJ Wollersheim
  • S Wooding
  • F Xu
  • O Yordanov
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Summary, in English

Relativistic projectile fragmentation of Pb-208 has been used to produce isomers in neutron-rich, A approximate to 190 nuclides. A forward-focusing spectrometer provided ion-by-ion mass and charge identification. The detection of gamma-rays emitted by stopped ions has led to the assignment of isomers in Ta-188, W-190, Re-192, Re-193, Os-195, Ir-197, Ir-198, Pt-200, Pt-201, Pt-202 and Au-203, with half-lives ranging from approximately 10 ns to 1 ms. Tentative isomer information has been found also for Er-174, Er-175, Hf-185, Re-191, Re-194 and Ir-199. In most cases, time-correlated, singles gamma-ray events provided the first spectroscopic data on excited states for each nuclide. In Pt-200 and Pt-201. the assignments are supported by gamma-gamma coincidences. Isomeric ratios provide additional information, such as half-life and transition energy constraints in particular cases. The level structures of the platinum isotopes are discussed, and comparisons are made with isomer systematics.

Publishing year

2005

Language

English

Pages

201-215

Publication/Series

European Physical Journal A. Hadrons and Nuclei

Volume

23

Issue

2

Document type

Journal article

Publisher

Springer

Topic

  • Subatomic Physics

Status

Published

Research group

  • Nuclear Structure

ISBN/ISSN/Other

  • ISSN: 1434-6001