Eur. Phys. J. A 10, 41-47

High-spin states in neutron-rich Dy isotopes populated in deep-inelastic reactions

X. Liang¹, R. Chapman¹, K.-M. Spohr¹, M.B. Smith¹, P. Bednarczyk^{2, 3}, S. Naguleswaran³, F. Haas³, G. de Angelis⁴, S.M. Campbell¹, P.J. Dagnall⁵, M. Davison¹, G. Duchêne³, Th. Kröll⁶, S. Lunardi⁶ and D.J. Middleton<sup>1

1</sup>  Division of Electronic Engineering and Physics, University of Paisley, Paisley PA1 2BE, UK
²  H. Niewodniczanski Institute of Nuclear Physics, PL-31-342 Kraków, Poland
³  IReS, F-67037 Strasbourg Cedex 2, France
⁴  INFN, LNL, I-35020 Legnaro, Italy
⁵  Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK
⁶  Dipartimento di Fisica and INFN, Sezione di Padova, 1-35131 Padova, Italy

lian-ph0@wpmail.paisley.ac.uk

(Received: 20 October 2000 / Revised version: 7 December 2000 Communicated by D. Schwalm)

Abstract
High-spin states in neutron-rich Dy isotopes, populated in deep-inelastic processes produced by the interaction of 234 MeV ³⁷Cl ions with a ¹⁶⁰Gd target, have been studied using the highly sensitive EUROBALL IV gamma-ray detector array. The previously known level schemes for ^{159,160,161,162}Dy have been extended to significantly higher spin ( ) and the i_13/2 band crossing in ¹⁵⁹Dy has been observed for the first time. The experimental results are discussed within the framework of cranked shell model and projected shell model calculations with particular reference to the observed delayed band crossing in ¹⁶²Dy.

PACS
23.20.Lv - Gamma transitions and level energies.
27.70.+q - .

© Società Italiana di Fisica, Springer-Verlag 2001