Radiationless transition probabilities in muonic208Pb,232Th, and238U
Abstract
The probabilities for non-radiative (n.r.) excitations P n.r. in the muonic nuclides208Pb,232Th, and238U have been determined from (μ-,γγ)-measurements by comparing the intensities of muonic X-ray transitions in single and coincidence spectra. The value of P n.r. (3 p→1 s), measured for the first time, is about 90% for the actinides232Th and238U, but only about 8% for208Pb. The value of P n.r. (3 d→1 s) is found to be 10 % for233Th, 13% for238U, and about 4% for208Pb. For208Pb a vanishing strength of the n.r. decay of the 2 p-level is found, while for232Th and for238U n.r. strengths of about 20% and 26%, respectively, are observed. By regarding two subcomplexes of the 2 p→1 s transitions leading to different mean excitation energies the n.r. transition probabilities were found to be different for238U only, 21.6% and 31.1.%, respectively.
- Publication:
-
Zeitschrift fur Physik A Hadrons and Nuclei
- Pub Date:
- June 1991
- DOI:
- 10.1007/BF01303833
- Bibcode:
- 1991ZPhyA.340..199R
- Keywords:
-
- 13.10. + q;
- 23.20.-g;
- 36.10.-k;
- 36.10.Dr