Measurements of isomeric cross-section ratios for neutron capture in the resonances region

X. Ledoux; J. Sigaud; T. Granier; J-P. Lochard; Y. Patin; P. Pras; C. Varignon; J-M. Laborie; Y. Boulin; F. Gunsing

doi:10.1140/epja/i2005-10195-x

EPJ

Measurements of isomeric cross-section ratios for neutron capture in the resonances region

X. Ledoux¹^*, J. Sigaud¹, T. Granier¹, J-P. Lochard¹, Y. Patin¹, P. Pras¹, C. Varignon¹, J-M. Laborie², Y. Boulin² and F. Gunsing³

¹ CEA/DIF/DPTA Service de Physique Nucléaire, BP 12, F-91680, Bruyères-le-Châtel, France
² CEA/DIF/DASE Service de Radioanalyse, Chimie et Environnement, BP 12, F-91680, Bruyères-le-Châtel, France
³ CEA/DSM/DAPNIA/SPhN CEA-Saclay, F-91191, Gif-sur-Yvette, France

Received: 7 July 2005
Accepted: 16 January 2006
Published online: 3 February 2006

Abstract

The creation of isomeric nuclei by neutron capture in the resonances energy range was studied with the lead slowing-down assembly CIRENE. The isomeric-ratio measurement of 8 nuclei allows to determine the spin of the compound nucleus at the binding energy. An experiment on ¹⁷⁷Lu underlines the role of the spin of a resonance on the isomeric-state feeding probability.

PACS: 23.20.Lv γ transitions and level energies – / 24.60.Dr Statistical compound-nucleus reactions – / 25.40.Ny Resonance reactions – / 29.30.Kv X- and γ-ray spectroscopy –

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EPJ

Measurements of isomeric cross-section ratios for neutron capture in the resonances region

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