New high-spin states of 142 58Ce and 140 56Ba from fusion-fission reactions: Proton excitations in the N = 84 isotones

Ts. Venkova; M. -G. Porquet; I. Deloncle; P. Petkov; A. Astier; A. Prévost; F. Azaiez; A. Bogachev; A. Buta; D. Curien; O. Dorvaux; G. Duchêne; J. Durell; B. J. P. Gall; M. Houry; F. Khalfallah; R. Lucas; M. Meyer; I. Piqueras; N. Redon; A. Roach; M. Rousseau; O. Stézowski; Ch. Theisen

doi:10.1140/epja/i2007-10526-y

2021 Impact factor 3.131

Hadrons and Nuclei

Eur. Phys. J. A (2007) 34: 349-353
https://doi.org/10.1140/epja/i2007-10526-y

Regular Article - Experimental Physics

New high-spin states of ¹⁴² ₅₈Ce and ¹⁴⁰ ₅₆Ba from fusion-fission reactions: Proton excitations in the N = 84 isotones

Ts. Venkova¹^,2, M. -G. Porquet¹^*, I. Deloncle¹, P. Petkov¹^,2, A. Astier¹, A. Prévost¹, F. Azaiez³, A. Bogachev⁴, A. Buta³, D. Curien³, O. Dorvaux³, G. Duchêne³, J. Durell⁵, B. J. P. Gall³, M. Houry⁶, F. Khalfallah³, R. Lucas⁶, M. Meyer⁷, I. Piqueras³, N. Redon⁷, A. Roach⁵, M. Rousseau³, O. Stézowski⁷ and Ch. Theisen⁶

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 IPHC-DRS, Université Louis Pasteur/IN2P3-CNRS, 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: 2 October 2007
Accepted: 17 January 2008
Published online: 6 February 2008

Abstract

High-spin states in the ¹⁴²Ce and ¹⁴⁰Ba nuclei have been populated in the ¹²C + ²³⁸U and ¹⁸O + ²⁰⁸Pb fusion-fission reactions at 90MeV and 85MeV bombarding energy, respectively. The emitted γ -radiation was detected using the Euroball III and IV arrays. The high-spin yrast and near-to-yrast structures of ¹⁴²Ce have been considerably extended. The level scheme of ¹⁴⁰Ba has been extended by six new levels. The newly observed structures in these N = 84 isotones are discussed by analogy with the neighbouring nuclei.

PACS: 21.10.-k Properties of nuclei; nuclear energy levels – / 21.10.Re Collective levels – / 23.20.Lv γ transitions and level energies – / 27.60.+j 90 ⩽ A ⩽ 149 –

© Società Italiana di Fisica and Springer-Verlag, 2008