K-L x-ray angular correlations in Cm, Pu, and Eu
Abstract
Angular correlations between K and L x rays in 245Cm, 239Pu, and 153Eu were measured. The x rays of Cm, Pu, and Eu were obtained from radioactive sources of 352-yr 249Cf, 32-yr 243Cm, and 242-day 153Gd, respectively. The K x rays were detected with a cooled Ge(Li) spectrometer with energy resolution of 500-eV full width at half-maximum (FWHM) at 122 keV. The L x rays were detected with a cooled Si(Li) spectrometer with energy resolution of 170 eV (FWHM) at 5.9 keV. Several corrections to the angular-correlation coefficients were made including a correction for the presence of silicon x-ray escape peaks. The corrected angular-correlation coefficients are: <colspec colname="Col1"/><colspec colname="Col2"/><colspec colname="Col3"/><colspec colname="Col4"/> Cascade A22 (Cm) A22 (Pu) A22 (Eu) Kα1-Ll (26.4 +/- 2.2) × 10-2 (27.0 +/- 1.7) × 10-2 (20.5 +/- 5.9) × 10-2 Kα1-Lα1+2 (4.48 +/- 0.58) × 10-2 (4.74 +/- 0.40) × 10-2 (2.73 +/- 0.39) × 10-2 Kα1-Lβ2+5+6+7+15 (5.14 +/- 0.80) × 10-2 (3.09 +/- 0.57) × 10-2 (5.7 +/- 2.0) × 10-2 The results for the Kα1-Lα cascades are in good agreement with theoretical predictions. The results for the Kα1-Lβ cascade agree with theory for Eu but deviate significantly from theory for Pu and Cm. The results for the Kα1-Ll cascade in all three elements are lower than theoretical predictions. Results of similar studies of other elements are tabulated and compared to theory. For all elements studied the experimental angular-correlation coefficient agrees with the theoretical value for the Kα1-Lα cascade but is lower than the theoretical value for the Kα1-Ll cascade.
- Publication:
-
Physical Review A
- Pub Date:
- June 1974
- DOI:
- 10.1103/PhysRevA.9.2356
- Bibcode:
- 1974PhRvA...9.2356M