Neutron Capture on <SUP>209</SUP>Bi: Determination of the Production Ratio of ^(210m)Bi/^(210g)Bi
Neutron Capture on <SUP>209</SUP>Bi: Determination of the Production Ratio of ^(210m)Bi/^(210g)Bi
F. Gunsing(CEA Saclay); E. Berthoumieux(CEA/Saclay - DSM/DAPNIA); A. Borella(Institute for Reference Materials and Measurements); T. Belgya(Institute of Isotopes); L. Szentmiklosi(Institute of Isotopes); P. Schillebeeckx(Institute for Reference Materials and Measurements); J. C. Drohe(EC-JRC-IRMM); R. Wynants(EC-JRC-IRMM); N. Colonna(Istituto Nazionale di Fisica Nucleare); S. Marrone(Istituto Nazionale di Fisica Nucleare); G. Tagliente(Istituto Nazionale di Fisica Nucleare); R. Terlizzi(Istituto Nazionale di Fisica Nucleare); C. Domingo-pardo(CSIC-Universidad de Valencia); J. Tain(CSIC-Universidad de Valencia); T. Martinez(CIEMAT); C. Massimi(Istituto Nazionale di Fisica Nucleare); P. M. Mastinu(Laboratori Nazionali di Legnaro); P. M. Milazzo(Istituto Nazionale di Fisica Nucleare)
59권 23호, 1670~1675쪽
초록
Neutron capture on ^(209)Bi produces either an isomeric state ^(210m)Bi with a half life of 3×10^6 years, or the ground state ^(210g)Bi which decays with a half life of 5 days to the alpha emitter ^(210)Po. Therefore the neutron capture cross section ratio ^(209)Bi(n,γ) ^(210m)^(Bi)/^(210g)Bi plays an important role in predicting the short- and long-term radio-toxicity produced by ^(209)Bi under neutron irradiation. This ratio is dependent on the neutron energy. We have measured this ratio for cold neutrons at the cold neutron beam facility of the Budapest Neutron Centre by observing the population of the ground- and the metastable state using high resolution gamma-ray spectroscopy. The same technique hasbeen used at the pulsed white neutron source GELINA of the IRMM, Geel in combination with the neutron time-of-flight technique. Results for the neutron-energy dependent branching ratio will be presented. In addition we performed simulations using a statistical decay code.
Abstract
Neutron capture on ^(209)Bi produces either an isomeric state ^(210m)Bi with a half life of 3×10^6 years, or the ground state ^(210g)Bi which decays with a half life of 5 days to the alpha emitter ^(210)Po. Therefore the neutron capture cross section ratio ^(209)Bi(n,γ) ^(210m)^(Bi)/^(210g)Bi plays an important role in predicting the short- and long-term radio-toxicity produced by ^(209)Bi under neutron irradiation. This ratio is dependent on the neutron energy. We have measured this ratio for cold neutrons at the cold neutron beam facility of the Budapest Neutron Centre by observing the population of the ground- and the metastable state using high resolution gamma-ray spectroscopy. The same technique hasbeen used at the pulsed white neutron source GELINA of the IRMM, Geel in combination with the neutron time-of-flight technique. Results for the neutron-energy dependent branching ratio will be presented. In addition we performed simulations using a statistical decay code.
- 발행기관:
- 한국물리학회
- 분류:
- 물리학