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

Författare:
  • M Caamano
  • PM Walker
  • PH Regan
  • M Pfutzner
  • Z Podolyak
  • J Gerl
  • Margareta Hellström (Docent)
  • 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
Publiceringsår: 2005
Språk: Engelska
Sidor: 201-215
Publikation/Tidskrift/Serie: EUROPEAN PHYSICAL JOURNAL A
Volym: 23
Nummer: 2
Dokumenttyp: Artikel
Förlag: SPRINGER

Sammanfattning

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.

Disputation

Nyckelord

  • Physics and Astronomy

Övriga

Published
Yes
  • Nuclear Structure
  • ISSN: 1434-6001

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