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

M. Caamano, P.M. Walker, P.H. Regan, M. Pfutzner, Zs. Podolyak, J. Gerl, M. Hellstrom, P. Mayet, M.N. Mineva, A. Aprahamian, J. Benlliure, Alison Bruce, P.A. Butler, D. Cortina Gil, D.M. Cullen, J. Doring, T. Enqvist, C. Fox, J. Garces Narro, H. GeisselW. Gelletly, J. Giovinazzo, M. Gorska, H. Grawe, R. Grzywacz, A. Kleinbohl, W. Korten, M. Lewitowicz, R. Lucas, H. Mach, C.D.O. Leary, F. De Oliveira, C.J. Pearson, F. Rejmund, M. Rejmund, M. Sawicka, H. Schaffner, C. Schlegel, K. Schmidt, K.H. Schmidt, P.D. Stevenson, Ch. Theisen, F. Vives, D.D. Warner, C. Wheldon, H.J. Wollersheim, S. Wooding, F. Xu, O. Yordanov

Research output: Contribution to journalArticle

Abstract

Relativistic projectile fragmentation of 208Pb has been used to produce isomers in neutron-rich, A ap 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 188Ta, 190W, 192Re, 193Re, 195Os, 197Ir, 198Ir, 200Pt, 201Pt, 202Pt and 203Au, with half-lives ranging from approximately 10 ns to 1 ms. Tentative isomer information has been found also for 174Er, 175Er, 185Hf, 191Re, 194Re and 199Ir. In most cases, time-correlated, singles gamma-ray events provided the first spectroscopic data on excited states for each nuclide. In 200Pt and 201Pt, 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.
Original languageEnglish
Pages (from-to)201-215
Number of pages15
JournalThe European Physical Journal A - Hadrons and Nuclei
Volume23
Issue number2
Publication statusPublished - Feb 2005

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    Caamano, M., Walker, P. M., Regan, P. H., Pfutzner, M., Podolyak, Z., Gerl, J., Hellstrom, M., Mayet, P., Mineva, M. N., Aprahamian, A., Benlliure, J., Bruce, A., Butler, P. A., Cortina Gil, D., Cullen, D. M., Doring, J., Enqvist, T., Fox, C., Garces Narro, J., ... Yordanov, O. (2005). Isomers in neutron-rich A~190 nuclides from 208Pb fragmentation. The European Physical Journal A - Hadrons and Nuclei, 23(2), 201-215.