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Long-lived isomers in neutron-rich Z = 72–76 nuclides

MPG-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons30773

Litvinov ,  Yury
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
GSI Helmholtzzentrum für Schwerionenforschung ;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons37593

Shubina ,  Daria
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30312

Blaum ,  Klaus
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

Winckler ,  N.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
GSI Helmholtzzentrum für Schwerionenforschung ;

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Citation

Reed, M., Walker, P., Cullen, I., Litvinov, Y., Shubina, D., Dracoulis, G., et al. (2012). Long-lived isomers in neutron-rich Z = 72–76 nuclides. Physical Review C, 86(5):, pp. 1-14. doi:10.1103/PhysRevC.86.054321.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-249F-3
Abstract
A study of neutron-rich isotopes in the A=185 region of the nuclear chart has uncovered long-lived (>1 s) isomers in several isotopes of hafnium, tantalum, tungsten, rhenium, and osmium. The region was accessed via the use of projectile fragmentation with the UNILAC-SIS accelerators at GSI. Fragmentation products of 197Au were passed through the fragment separator (FRS) and injected into the experimental storage ring (ESR), where single-ion identifications could be made. Evidence is presented for isomers in 183,184,186Hf, 186,187Ta, 186W, 190,192,194Re, and 195Os with excitation energies in the range of 0.1–3.0 MeV. The lightest of these nuclides have well deformed prolate shapes, while the heaviest are transitional and susceptible to shape changes. Their properties are interpreted with the help of multi-quasiparticle and potential-energy-surface calculations.