Spectroscopy of Ir nuclei

doi:10.1088/0954-3899/31/10/061

In-beam and decay spectroscopy of very neutron deficient iridium nuclei

C Scholey et al 2005 J. Phys. G: Nucl. Part. Phys. 31 S1719-S1722 doi: 10.1088/0954-3899/31/10/061

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C Scholey¹, M Sandzelius^1,2, S Eeckhaudt¹, T Grahn¹, P T Greenlees¹, P Jones¹, R Julin¹, S Juutinen¹, M Leino¹, A-P Leppänen¹, P Nieminen^1,5, M Nyman¹, J Perkowski^1,6, J Pakarinen¹, P Rahkila¹, P M Rahkila¹, J Uusitalo¹, K Van de Vel¹, B Cederwall², B Hadinia², K Lagergren^2,7, D T Joss³, D E Appelbe³, C J Barton^3,8, J Simpson³, D D Warner³, I G Darby^1,4, R D Page⁴, E S Paul⁴ and D Wiseman⁴
¹ Department of Physics, University of Jyväskylä, PO Box 35, FI 40014, Finland
² Royal Institute of Technology, S-106 91 Stockholm, Sweden
³ CCLRC, Daresbury Laboratory, Daresbury Warrington, WA4 4AD, UK
⁴ Department of Physics, University of Liverpool, Liverpool, L69 7ZE, UK
⁵ Present address: Department of Physics, RSPhysSE, ANU, Canberra, ACT 0200, Australia
⁶ Present address: Department of Physics and Radiation Safety, University of Lodz, Lodz, Poland
⁷ Present address: Department of Physics, Florida State University, Tallahassee, FL 32306, USA
⁸ Present address: Department of Physics, University of York, Heslington, York, YO1 5DD, UK
E-mail: cs@phys.jyu.fi

Abstract. Iridium nuclei at and beyond the proton drip line have been studied via fusion evaporation reactions. A reaction of ⁹²Mo(⁷⁸Kr, p2n) at a beam energy of 360 MeV and target thickness 500 µg cm⁻² was employed to study ^167,167mIr. A reaction of ¹¹²Sn(⁵⁸Ni, p2n) at a beam energy of 266 MeV and target thickness 500 µg cm⁻² was used to study ^169,169mIr. The experiments were performed at the University of Jyväskylä utilizing the RITU separator in conjunction with the focal plane GREAT spectrometer and the JUROGAM Ge array at the target position. Excited states feeding both the ground state and isomeric state in ¹⁶⁹Ir, excited states feeding the ground state of ¹⁶⁷Ir and the ground state alpha decay of ¹⁶⁵Re have been observed for the first time along with excited states feeding ^167mIr. Experimental spectroscopic factors and reduced widths have been obtained for the proton and alpha decay of these nuclei.

Print publication: Issue 10 (October 2005)
Received 21 March 2005
Published 12 September 2005

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In-beam and decay spectroscopy of very neutron deficient iridium nuclei

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