| M. Caamano, P. M. Walker, P. H. Regan, M. Pfützner, Zs. Podolyák, J. Gerl, M. Hellström, P. Mayet, M. N. Mineva, A. Aprahamian, J. Benlliure, A. M. Bruce, P. A. Butler, D. Cortina Gil, D. M. Cullen, J. Döring, T. Enqvist, C. Fox, J. Garcés Narro, H. Geissel, W. Gelletly, J. Giovinazzo, M. Górska, H. Grawe, R. Grzywacz, A. Kleinböh, 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. Vivès, D. D. Warner, C. Wheldon, H. J. Wollersheim, S. Wooding, F. Xu1, and O. Yordanov |
Relativistic projectile fragmentation of 208Pb has been used to produce isomers in neutron-rich, A ~ 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. |
