¹⁵¹Eu Mössbauer spectroscopic studies of “after effects” of the electron capture decay of¹⁵¹Gd

Abstract

Mossbauer spectroscopy has been used to observe the production of an 'anomalous' charge state, U ~E U ~+ , following the electron capture decay of 151GdS+ incorporated in Erz(Cz04)3, 10H20.

Mössbauer Study of the Chemical Consequences of the 151Sm(β~)151Eu Decay in Various Samarium Compounds

“…A more detailed study of the Eu+ 2 formation in various rare earth trichloride-type host lattices is in progress and may elucidate this point. Similarly, the results of GLENTWORTH et al [12], who have observed formation of Eu+ 2 following the electron capture in a source of 161 Gd in Er 2 (C 2 0 4 ) 3 · 10H 2 0, and the absence of a line characteristic for Eu +a in our emission spectrum of 161 Sm in Sm 2 (C 2 0 4 ) 3 · 10H 2 0 suggest further experiments with other rare earth oxalates as host matrices.…”

“…However, an emission line attributed to Dy^ has been observed in the Mössbauer spectra of the 25.6 keV y-rays of lel Dy emitted after the ß~ decay of lel [10] to be either + 4 or predominantly + 3, depending on the annealing history of the sources. GLENTWORTH et al [11,12] studied the consequences of the ß~ decay of 161 Sm and the electron capture decay of 151 Gd, both populating the 21.6 keV Mössbauer level of 161 Eu. In a number of chelates of trivalent Sm and Gd they observed only the formation of Eu 4 " 3 [11], but the emission spectrum of a source of Er 2 (C 2 0 4 ) 3 · 10H 2 0 doped with 1B1 Gd was found to consist of two lines attributable to Eu+ 3 and Eu+ 2 with an intensity ratio of about 2:1.…”

A study of radiation defects in solids by means of Mössbauer spectroscopy

“…Estimates of the lifetime made by different authors are contradictory ranging from Modifications of the mechanism of Varley were later proposed [12 to 141. They involve the separation of the vacancy and interstitial atom at distances ensuring the stability of the Frenkel pair [ l a to 141, the possibility of formation of intermediate long-lived excited atomic configurations [ 13,141, and the replacement of the multiple ionization of an atom by single ionization of the neighbour atoms [ 12 to 141. However, there is a t present no convincing evidence for the realization of the Varley's mechanism or its modifications in alkali halide crystals.…”