Neutron cross sections for 151Eu below 1 eV
Abstract
Total and activation cross-section measurements on 151Eu have been performed with monochromatic neutrons between 0.02 eV and 0.75 eV and with thermalized neutrons. The following results have been obtained: σnt(Eu) = 4590 ± 70 b at 0.0253 eV; σ nγ( 151Eu) = 9184 ± 140 b at 0.0253 eV ; σ act( 151Eu( n,γ) 152 mEu) = 3236 ± 120 b at 0.0253 eV and 2809 ± 120 b in a thermalized neutron spectrum T = 313 K) giving a Westcott g-factor = 0.87 ± 0.02; the resonance parameters of the bound level are: Eo = -3.61 ± 0.02 meV, Γ = 95.80 ± 0.01 meV, σ o√|E o| = 1696 ± 70 b · eV{1}/{2}; the isomeric ratio R = σactσn, γ = 0.360 ± 0.02 for the bound level, 0.380 ± 0.035 for the 0.321 eV resonance and 0.270 ± 0.012 for the 0.460 eV resonance. The Westcott g( T) function, calculated with the present results agrees very well with experiment.
- Publication:
-
Nuclear Physics A
- Pub Date:
- September 1971
- DOI:
- 10.1016/0375-9474(71)90039-X
- Bibcode:
- 1971NuPhA.172..489P