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

Caamano, M., Walker, P.M., Regan, P.H., Pfutzner, M., Podolyak, Zs., Gerl, J., Hellstrom, M, Mayet, P., Mineva, M.N., Aprahamian, A., Benlliure, J., Bruce, A.M., Butler, P.A., Cortina Gil, D., Cullen, D.M., Doring, J., Enqvist, T., Fox, C., Garces Narro, J., Geissel, H., Gelletly, W., Giovinazzo, J., Gorska, M., Grawe, H., Grzywacz, R., Kleinbohl, A., Korten, W., Lewitowicz, M., Lucas, R., Mach, H., Leary, C.D.O., De Oliveira, F., Pearson, C.J., Rejmund, F., Rejmund, M., Sawicka, M., Schaffner, H., Schlegel, C., Schmidt, K., Schmidt, K.H., Stevenson, P.D., Theisen, Ch., Vives, F., Warner, D.D., Wheldon, C., Wollersheim, H.J., Wooding, S., Xu, F. and Yordanov, O. (2005) Isomers in neutron-rich A~190 nuclides from 208Pb fragmentation The European Physical Journal A - Hadrons and Nuclei, 23 (2). pp. 201-215. ISSN 1434-601X

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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.

Item Type: Journal article
Subjects: F000 Physical Sciences > F300 Physics
DOI (a stable link to the resource): 10.1140/epja/i2004-10079-7
Faculties: Faculty of Science and Engineering > School of Computing, Engineering and Mathematics > Engineering and Product Design Research > Nuclear Physics
Depositing User: editor engineering
Date Deposited: 10 Sep 2007
Last Modified: 15 Nov 2013 14:09
URI: http://eprints.brighton.ac.uk/id/eprint/168

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