International Conference on Nuclear Data for Science and Technology 2007
DOI: 10.1051/ndata:07431

Measurements of the branching ratio of the ²⁰⁹Bi(n,γ)^210gBi/^210mBi reactions at GELINA

A. Borella^{1, 2}, T. Belgya³, E. Berthoumieux¹, N. Colonna⁴, C. Domingo-Pardo⁵, J.C. Drohe², F. Gunsing³, S. Marrone⁴, T. Martinez⁶, C. Massimi⁷, P.M. Mastinu⁸, P.M. Milazzo⁹, P. Schillebeeckx², G. Tagliente⁴, J. Tain⁵, R. Terlizzi⁴ and R. Wynants<sup>2

1</sup>  CEA/Saclay, DSM/DAPNIA/SPhN, 91911 Gif-sur-Yvette, France
²  EC-JRC-IRMM, Retieseweg 111, 2440 Geel, Belgium
³  Institute for Isotopes Hungarian Academy of Sciences, CRC HAS, P.O. Box 77, 1525 Budapest, Hungary
⁴  Istituto Nazionale di Fisica Nucleare, Bari, Italy
⁵  Instituto de Fisica Corpuscular, CSIC-Universidad de Valencia, Spain
⁶  Centro de Investigaciones Energeticas Medioambientales y Technologicas, Madrid, Spain
⁷  Istituto Nazionale di Fisica Nucleare, Bologna, Italy
⁸  Laboratori Nazionali di Legnaro, Legnaro, Italy
⁹  Istituto Nazionale di Fisica Nucleare, Trieste, Italy

alessandroborella@yahoo.it

Published online: 21 May 2008

Abstract
Measurements to determine the energy dependent branching ratio for the neutron induced capture reaction on ²⁰⁹Bi were performed at the time-of-flight facility GELINA of the IRMM in Geel (Belgium). By using germanium γ-ray detectors in combination with the time-of-flight technique, the γ-ray spectra following neutron capture on ²⁰⁹Bi were determined around 6 neutron resonances between 0.8 keV and 7.0 keV. The relative partial cross sections were obtained by correcting the full energy net peak areas for the effective γ-ray detection efficiency and internal conversion. The effective γ-ray efficiency was obtained from a Monte Carlo model validated through measurements with calibrated sources. The results of a preliminary analysis are given in this paper.

© CEA 2008