K-isomers in very neutron-rich nuclei around mass 180

C Schlegel; P H Regan; M Pfützner; J Gerl; M Hellström; Zs Podolyák; M Caamaño; P Mayet; A Aprahamian; J Benlliure; A M Bruce; P A Butler; D Cortina Gil; D M Cullen; J Döring; T Enquist; F Farget; C Fox; J Garcés Narro; W Gelletly; J Giovinazzo; M Górska; H Grawe; R Grzywacz; A Kleinböhl; W Korten; M Lewitowicz; R Lucas; H Mach; M Mineva; C O'Leary; F De Oliveira; C J Pearson; M Rejmund; M Sawicka; H Schaffner; K Schmidt; Ch Theisen; P M Walker; D D Warner; C Wheldon; H J Wollersheim; S Wooding; F Xu

doi:10.1238/Physica.Topical.088a00072

Physica Scripta

K-isomers in very neutron-rich nuclei around mass 180

C Schlegel¹, P H Regan², M Pfützner³, J Gerl¹, M Hellström⁴, Zs Podolyák², M Caamaño², P Mayet¹, A Aprahamian², J Benlliure⁵, A M Bruce⁶, P A Butler⁷, D Cortina Gil¹, D M Cullen⁷, J Döring¹, T Enquist¹, F Farget⁸, C Fox⁷, J Garcés Narro², W Gelletly², J Giovinazzo⁹, M Górska¹, H Grawe¹, R Grzywacz¹⁰, A Kleinböhl¹, W Korten¹¹, M Lewitowicz¹², R Lucas¹¹, H Mach¹³, M Mineva⁴, C O'Leary⁷, F De Oliveira¹², C J Pearson², M Rejmund⁸, M Sawicka³, H Schaffner¹, K Schmidt¹, Ch Theisen¹¹, P M Walker², D D Warner¹⁴, C Wheldon², H J Wollersheim¹, S Wooding¹² and F Xu¹

Published under licence by IOP Publishing Ltd
Physica Scripta, Volume 2000, Number T88 Citation C Schlegel et al 2000 Phys. Scr. 2000 72 DOI 10.1238/Physica.Topical.088a00072

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Author affiliations

¹ GSI, Planckstrasse 1, D-64291 Darmstadt, Germany

² Department of Physics, University of Surrey, Guildford, GU2 5XH, UK

³ Institute of Experimental Physics, Warsaw University, Warsaw, Pl-00861, Poland

⁴ Division of Cosmic and Subatomic Physics, Lund University, Lund, SE-22100, Sweden

⁵ Department of Física de Partículas, University of Santiago de Compostela, Spain

⁶ Department of Mathematical Science, University of Brighton, Brighton, BN2 4GJ, UK

⁷ Department of Physics, University of Liverpool, Liverpool, L69 3BX, UK

⁸ IPN, 91406 Orsay Cedex, France

⁹ CNRS Bordeaux, France

¹⁰ University of Tennesse, Knoxville, 37996, USA

¹¹ CEA Saclay, Paris, France

¹² GANIL, BP 5027, F-14021 Caen, France

¹³ Department of Neutron Research, Uppsala University, Nyköping, S-61182, Sweden

¹⁴ Daresbury Laboratory, Warrington, WA4 4AD, UK

Dates

Received 6 September 1999

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Abstract

γ-spectroscopy methods have been used to search for microsecond isomers among the fragmentation products of a 1 GeV / nucleon ²⁰⁸Pb beam. In particular the population of the known K^π = 35/2^- isomer in ¹⁷⁹W has been investigated and several new isomeric decays have been found for neutron rich nuclei in the A ≈ 180–200 mass region. The ground state band of the neutron rich N = 116 system of ¹⁹⁰W has been identified for the first time and we discuss its structure in comparison to neighboring systems.

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K-isomers in very neutron-rich nuclei around mass 180

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