Eur. Phys. J. A 10, 275-287

Yrast level structure of the neutron-deficient N = 80 isotones ¹⁴⁶Dy, ¹⁴⁷Ho and ¹⁴⁸Er up to high-spin values

H.A. Roth¹, S.E. Arnell¹, D. Foltescu¹, Ö. Skeppstedt¹, J. Blomqvist², G. de Angelis³, D. Bazzacco⁴ and S. Lunardi<sup>4

1</sup>  Department of Physics, Chalmers University of Technology, and the University of Gothenburg, S-41296 Göteborg, Sweden
²  Department of Physics, The Royal Institute of Technology, S-10405 Stockholm, Sweden
³  Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
⁴  Dipartimento di Fisica dell'Università, and Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy

(Received: 12 January 2001 / Revised version: 10 April 2001 Communicated by D. Schwalm)

Abstract
High-spin level schemes of the N = 80 isotones ¹⁴⁶Dy, ¹⁴⁷Ho and ¹⁴⁸Er have been investigated by in-beam -ray spectroscopic methods using the NORDBALL Compton-suppressed multidetector array including proton and neutron selection. The projectile-target system ⁵⁸Ni + ⁹²Mo at 260 MeV beam energy has been used to produce the neutron-deficient N = 80 isotones. The previously known schemes have been extended to considerably higher spin and exitation energy, up to , MeV in ¹⁴⁶Dy, , MeV in ¹⁴⁷Ho and , MeV in ¹⁴⁸Er. The results are discussed in terms of the spherical shell model. Many of the levels can be described within this framework.

PACS
23.20.Lv - transitions and level energies.
25.70.Jj - Fusion and fusion-fission reactions.
21.60.Cs - Shell model.
27.60.+j - .

© Società Italiana di Fisica, Springer-Verlag 2001