Eur. Phys. J. A (2005) 26: 315-319
https://doi.org/10.1140/epja/i2005-10181-4

Original Article

New high-spin states of ¹⁴⁷Nd and ¹⁴⁵Ce: Octupole correlation in the N = 87 isotones

¹ CSNSM, IN2P3-CNRS/Université Paris-Sud, 91405, Orsay, France
² Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 1784, Sofia, Bulgaria
³ IReS, IN2P3-CNRS/Université Louis Pasteur, 67037, Strasbourg Cedex 2, France
⁴ JINR, Joliot-Curie 6, 141980, Dubna, Moscow region, Russia
⁵ Department of Physics and Astronomy, University of Manchester, M13 9PL, Manchester, UK
⁶ Commissariat à l'Énergie Atomique, CEA/DSM/DAPNIA/SPhN, 91191, Gif-sur-Yvette Cedex, France
⁷ IPNL, IN2P3-CNRS/Université Claude Bernard, 69622, Villeurbanne Cedex, France

^* e-mail: porquet@csnsm.in2p3.fr

Received: 1 August 2005
Accepted: 5 December 2005
Published online: 27 December 2005

Abstract

High-spin states of the N = 87 nuclei, ¹⁴⁷Nd and ¹⁴⁵Ce, have been populated in the ¹²C + ²³⁸U and ¹⁸O + ²⁰⁸Pb fusion-fission reactions at 90 MeV and 85 MeV bombarding energy, respectively. The emitted γ-radiation was detected using the Euroball III and IV arrays. High-spin states of the ¹⁴⁷Nd isotope have been identified for the first time. The high-spin yrast and near-to-yrast structures of the ¹⁴⁵Ce nucleus have been considerably extended. The newly observed structures, discussed by analogy with the neighbouring isotones, show the coupling of an h _9/2 neutron to the quadrupole and octupole excitations of the core.