Eur. Phys. J. Special Topics 150, 165-168 (2007)
https://doi.org/10.1140/epjst/e2007-00294-4

Isomeric decay studies around ²⁰⁴Pt and ¹⁴⁸Tb

¹ Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
² GSI, Planckstrasse 1, 64291 Darmstadt, Germany
³ IEP, Warsaw University, Hoźa 69, 00681 Warsaw, Poland
⁴ Department of Physics, Lund University, 22100 Lund, Sweden
⁵ Universidad de Santiago de Compostela, 15706 Santiago de Compostela, Spain
⁶ INFN, Universitá degli Studi di Milano, 20133 Milano, Italy
⁷ The Henryk Niewodniczański Institute of Nuclear Physics, 31342 Kraków, Poland
⁸ Departamento de Fisica Teórica, Universidad Autonoma de Madrid, 28049 Madrid, Spain
⁹ WNSL, Yale University, New Haven, CT, 06520-8124, USA
¹⁰ Faculty of Physics, University of Sofia, 1164 Sofia, Bulgaria
¹¹ Inst. for Nucl. Research and Nucl. Energy, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
¹² Dept. of Physics, University of York, Heslington, York, Y01 5DD, UK
¹³ CENBG, Le Haut Vigneau, BP. 120, 33175 Gradignan Cedex, France
¹⁴ IKP, Universität zu Köln, 50937 Köln, Germany
¹⁵ School of Engineering, University of Brighton, Brighton, BN2 4GJ, UK
¹⁶ Institute for Nuclear Research, ATOMKI, 4001 Debrecen, Hungary
¹⁷ Nuclear Engineering Division, Argonne National Laboratory, Argonne, IL, 60439, USA
¹⁸ Japan Atomic Energy Agency, Kyoto, 619-0215, Japan
¹⁹ Physik Department E12, Technische Universität München, Garching, Germany
²⁰ Department of Physics and Astronomy, Michigan State University, East Lansing, MI, 48824, USA

Received: 31 January 2007
Published online: 8 December 2007

Abstract

Relativistic energy projectile fragmentation of ²⁰⁸Pb has been used to produce a range of exotic nuclei. The nuclei of interest were studied by detecting delayed gamma rays following the decay of isomeric states. Experimental information on the excited states of the neutron-rich N=126 nucleus, ²⁰⁴Pt, following internal decay of two isomeric states, was obtained for the first time. In addition, decays from the previously reported isomeric I=27ħ and I=(49/2)ħ states in ¹⁴⁸Tb and ¹⁴⁷Gd, respectively, have been observed. These isomeric decays represent the highest spin discrete states observed to date following a projectile fragmentation reaction, and opens further the possibility of doing `high-spin physics' using this technique.