Improved characteristics of the 22.5 keV (M1 + E2) nuclear transition in 149Sm

The gamma ray and conversion electron spectra of the 22.5keV M 1 + E 2 nuclear transition depopulating the first excited level 5/2 − in 149 Sm were investigated in detail. A substantially improved value of 22500.2 ± 0.8 eV for the transition energy was determined that opens a possibility to establis...

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Bibliographic Details
Published in:The European physical journal. A, Hadrons and nuclei Hadrons and nuclei, 2011-05, Vol.47 (5), Article 64
Main Authors: Inoyatov, A. Kh, Filosofov, D. V., Gorozhankin, V. M., Kovalık, A., Adam, I., Perevoshchikov, L. L., Ryšavý, M.
Format: Article
Language:English
Subjects:
Hadrons
Heavy Ions
Nuclear Fusion
Nuclear Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Regular Article - Experimental Physics
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Summary:The gamma ray and conversion electron spectra of the 22.5keV M 1 + E 2 nuclear transition depopulating the first excited level 5/2 − in 149 Sm were investigated in detail. A substantially improved value of 22500.2 ± 0.8 eV for the transition energy was determined that opens a possibility to establish an electron energy standard for the keV region based on the conversion electron lines of this transition. The E 2 admixture parameter |δ( E 2/ M 1)| = 0.0784 ± 0.0009 and the nuclear structure parameter λ = − 2 ± 10 were derived. The |δ( E 2/ M 1)| and λ parameters were also obtained for all available experimental data and their mutual combination.
ISSN:1434-6001
1434-601X
DOI:10.1140/epja/i2011-11064-9