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Title: Isomers in Neutron-Rich A ?? 190 NNuclides from 208Pb Fragmentation

Journal Article · · The European Physical Journal A
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  1. University of Surrey, UK
  2. University of Warsaw, Poland
  3. Gesellschaft fur Schwerionenforschung (GSI), Germany
  4. Lund University, Sweden
  5. University of Notre Dame, IN
  6. University of Santiago de Compostela, Spain
  7. University of Brighton, UK
  8. Oliver Lodge Laboratory, University of Liverpool, UK
  9. CEN Bordeaux-Gradignan/CNRS, France
  10. GSI-Hemholtzzentrum fur Schwerionenforschung, Darmstadt, Germany
  11. University of Tennessee, Knoxville (UTK)
  12. French Atomic Energy Commission (CEA), Centre de Saclay, Gif sur Yvette
  13. Grand Accelerateur National d'Ions Lourds (GANIL)
  14. Uppsala University, Sweden
  15. IPN, Orsay, France
  16. Daresbury Laboratory, UK
+ Show Author Affiliations

Relativistic projectile fragmentation of {sup 208}Pb has been used to produce isomers in neutron-rich, A {approx} 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 {sup 188}Ta, {sup 190}W, {sup 192}Re, {sup 193}Re, {sup 195}Os, {sup 197}Ir, {sup 198}Ir, {sup 200}Pt, {sup 201}Pt, {sup 202}Pt and {sup 203}Au, with half-lives ranging from approximately 10 ns to 1 ms. Tentative isomer information has been found also for {sup 174}Er, {sup 175}Er, {sup 185}Hf, {sup 191}Re, {sup 194}Re and {sup 199}Ir. In most cases, time-correlated, singles gamma-ray events provided the first spectroscopic data on excited states for each nuclide. In {sup 200}Pt and {sup 201}Pt, 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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-00OR22725
OSTI ID:
931377
Journal Information:
The European Physical Journal A, Vol. 23, Issue 2; ISSN 1434-6001
Country of Publication:
United States
Language:
English

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Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
LEAD 208
NUCLEAR FRAGMENTATION
EXCITED STATES
HALF-LIFE
ISOMERS
ISOTOPES