Eur. Phys. J. A (2008) 36: 251-278
https://doi.org/10.1140/epja/i2008-10590-9

Regular Article - Experimental Physics

Extensive γ -ray spectroscopy of normally and superdeformed structures in ⁶¹ ₂₉Cu₃₂

¹ Department of Physics, Lund University, S-22100, Lund, Sweden
² Departamento de Física, Universidad Nacional de Colombia, Bogotá, Colombia
³ Department of Mathematical Physics, Lund Institute of Technology, S-22100, Lund, Sweden
⁴ Department of Physics, University of Guelph, N1G 2W1, Guelph, Ontario, Canada
⁵ Physics Division, Oak Ridge National Laboratory, 37831, Oak Ridge, TN, USA
⁶ Physics Division, Argonne National Laboratory, 60439, Argonne, IL, USA
⁷ Chemistry Department, Washington University, 63130, St. Louis, MO, USA

^* e-mail: lise-lotte.andersson@nuclear.lu.se

Received: 22 January 2008
Accepted: 8 May 2008
Published online: 11 June 2008

Abstract

A largely extended experimental knowledge of the ⁶¹ ₂₉Cu₃₂ nucleus has been obtained from three experiments. Excited states in ⁶¹Cu were produced via the fusion-evaporation reaction ²⁸Si(³⁶Ar, 3p)⁶¹Cu . In addition to the Ge array GAMMASPHERE, neutron and charged-particle detectors placed around the target position were used for high-performance particle spectroscopy. The constructed level scheme includes more than 160 energy levels and 320 γ -ray transitions belonging to both normally deformed as well as superdeformed rotational structures. The multipolarities have been determined for the γ -ray transitions and as a result spin-parity assignments are given for nearly all energy levels. Experimental results in the normally deformed region are compared with predictions from large-scale shell model calculations. The collective structures are compared with results from cranked Nilsson-Strutinsky calculations. The results reveal the need to modify the standard Nilsson parameters in the mass A ∼ 60 region.