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

Abstract : Relativistic projectile fragmentation of 208Pb has been used to produce isomers in neutron-rich, A appro 190 nuclides. A forward-focusing spectrometer provided ion-by-ion mass and charge identification. The detection of γ-rays emitted by stopped ions has led to the assignment of isomers in 188Ta, 190W, 192}Re, 193Re, 195Os, 197r, 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 γ-ray events provided the first spectroscopic daa on excited states for each nuclide. In 200Pt and 201Pt, the assignments are supported by γ-γ 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.
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Submitted on : Monday, January 24, 2005 - 12:06:14 PM
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M. Caamano, P. M. Walker, P. H. Regan, M. Pfützner, Zs. Podolyák, et al.. Isomers in neutron-rich A approx 190 nuclides from 208Pb fragmentation. European Physical Journal A, EDP Sciences, 2005, 23, pp.201-215. ⟨10.1140/epja/i2004-10079-7⟩. ⟨in2p3-00023622⟩

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