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

Author
Inoyatov A.Kh. JINR
Filosofov D.V. JINR
Gorozhankin V.M. JINR
Kovalík Alojz, Ing. DrSc. Nuclear Physics Institute of the ASCR, JINR Dubna
Adam Jindřich, promovaný fyzik Csc. Nuclear Physics Institute of the ASCR, JINR Dubna
Perevoshchikov L.L. JINR
Ryšavý  Miloš, RNDr. CSc.  Nuclear Physics Institute of the ASCR

Year
2011

Scientific journal
European Physical Journal A, 47 (5), 64-69

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Abstract
The gamma ray and conversion electron spectra of the 22.5 keV M1 + E2 nuclear transition depopulating the first excited level 5/2(-) in Sm-149 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 E2 admixture parameter vertical bar delta(E2/M1)vertical bar = 0.0784 +/- 0.0009 and the nuclear structure parameter lambda = -2 +/- 10 were derived. The vertical bar delta(E2/M1)vertical bar and lambda parameters were also obtained for all available experimental data and their mutual combination.

Cite article as:
A. Inoyatov, D. Filosofov, V. Gorozhankin, A. Kovalík, J. Adam, L. Perevoshchikov, M. Ryšavý , "Improved characteristics of the 22.5 keV (M1+E2) nuclear transition in Sm-149", European Physical Journal A, 47 (5), 64-69 (2011)