Eur. Phys. J. A 10, 145-150

First identification of rotational bands in : Evolution of intrinsic proton states of the isotopes

A. Bauchet¹, I. Deloncle¹, M.-G. Porquet¹, A. Astier², N. Buforn², M. Meyer², S. Perriès², N. Redon², B.J.P. Gall³, F. Hoellinger³, N. Schulz³, G. Duchêne³, S. Courtin³, Ts. Venkova⁴, P.A. Butler⁵, N. Amzal⁵, R.D. Herzberg⁵, A. Chewter⁵, R. Cunningham⁵, M. Houry⁶, R. Lucas⁶, W. Urban⁷, A. Nowak⁷, E. Piasecki⁷, J. Duprat⁸, C. Petrache⁹ and T. Kröll<sup>9

1</sup>  CSNSM, IN2P3/CNRS and Université Paris-Sud, 91405 Orsay Campus, France
²  IPNL, IN2P3/CNRS and Université Lyon-1, 69622 Villeurbanne, France
³  IReS, IN2P3/CNRS and Université Louis Pasteur, 67037 Strasbourg Cedex 2, France
⁴  INRNE, BAS, 1784 Sofia, Bulgaria
⁵  Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 3BX, United Kingdom
⁶  DAPNIA/SPhN, CEA Saclay, 91191 Gif-sur-Yvette, France
⁷  Institute of Experimental Physics, University of Warsaw, 00-681 Warszawa, Poland
⁸  IPN, IN2P3/CNRS and Université Paris-Sud, 91406 Orsay, France
⁹  Department of Physics and INFN, University of Padova, 35131 Padova, Italy

porquet@csnsm.in2p3.fr

(Received: 19 January 2001 Communicated by D. Schwalm)

Abstract
High-spin states of ¹⁰³ ₄₃Tc have been identified for the first time, this nucleus being produced as fission fragment following the fusion reaction ³⁷Cl + ¹⁷⁶Yb at 170 MeV bombarding energy. The high-spin level scheme has been built from the prompt gamma rays detected using the Euroball III array. It exhibits similarities with those of the neighbouring isotopes and isotones. All the band head configurations observed in the ^97-105Tc isotopes are identified from the behaviour of the rotational bands built on them. The single-proton states located around the Fermi level are discussed as a function of deformation of these nuclei.

PACS
21.60.Ev - Collective models.
23.20.Lv - Gamma transitions and level energies.
25.85.Ge - Charged-particle-induced fission.
27.60.+j - .

© Società Italiana di Fisica, Springer-Verlag 2001