Eur. Phys. J. A (2004) 20: 365-369
https://doi.org/10.1140/epja/i2003-10189-8

Letter

Multi-quasiparticle states in ¹⁸⁴ W via multi-nucleon transfer

¹ Department of Physics, University of Surrey, GU2 7XH, Guildford, Surrey, UK
² Kernphysik II, Gesellschaft für Schwerionenforschung, Max-Planck-Straße 1, D-64291, Darmstadt, Germany
³ Wright Nuclear Structure Laboratory, Yale University, CT 06520-8124, New Haven, USA
⁴ Department of Physics, University of Rochester, New York, NY, USA
⁵ Department of Physics and Astronomy, Schuster Laboratory, University of Manchester, M13 9PL, Manchester, UK
⁶ Lawrence Berkeley National Laboratory, CA, 94720, Berkeley, USA
⁷ School of ICT, University of Paisley, PA1 2BE, Paisley, UK
⁸ The Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17., 2100, Copenhagen, Denmark
⁹ CCLRC Daresbury Laboratory, WA 4AD, Warrington, UK

^* e-mail: wheldon@hmi.de

Abstract

A multi-nucleon transfer reaction using an 850 MeV ¹³⁶Xe beam incident on a ¹⁹⁸Pt target was used to populate high-spin states in ¹⁸⁴W, 14 nucleons from the target. A 4-quasiparticle isomer with ns has been observed for the first time and its de-excitation through collective and intrinsic structures studied. The results are compared with predictions of blocked BCS Nilsson calculations. Observation of this metastable state completes the tungsten 4-quasiparticle isomer systematics from A = 176 to 186. Mapping out the most yrast 4-quasiparticle isomers in these even-even tungsten isotopes suggests the existence of a highly favoured state in ¹⁸⁸W, within reach of current experimental set-ups.