Measurements of the total internal conversion coefficient and probability in the decay of 139Ce

Internal conversion coefficient for the 165.8 keV transition in139La

“…The measured conversion ratios are in good agreement with other experimental values especially with those published by Ketelle et al [1] and Geiger et al [13]. The deduced internal conversion coefficients agree very well with the most precise values given by Taylor and Merritt [11] and Plch et al [17]. The low value for the total internal conversion coefficient quoted with a high precision by Legrand et al [16] is not supported by the actual result; an explanation for the discrepancy could not be found.…”

“…The adopted multipolarity of the ?-ray is M1 as deduced from internal conversion data. The internal conversion process of the 165.8 keV ?-ray has been subject of numerous studies [1,[5][6][7][8][9][10][11][12][13][14][15][16][17]. A compilation of experimental results is shown in Table 1.…”

Nuclear structure effect on internal conversion ofl-forbidden transitions in139La,141Pr and203Tl

“…In the case of 139La Plch et al [5] have derived a nuclear penetration parameter of 2=3.1 _+0.7 from a comparison of their experimental K-shell ICC c~/~ =0.214_+0.002 and the theoretical value of ~(M1) =0.226 [8]. Under the assumption of a pure M1 character of the transition and with their penetration parameter they found a good agreement between experiment and theory not only for the K-shell ICC but also for the total ICC and various subshell conversion ratios.…”

“…The discrepancies between experimental and theoretical ICC have been discussed under the aspect of nuclear penetration by several authors [5,7,15,16]. Only little and vague information is available for ~4~Pr [10,11].…”

Internal conversion of high-multipolarity transitions in109Ag and113In

“…A typical spectrum is shown in Figure 1. The form of the conversion-electron peak below the peak of Auger electrons and X-rays was derived from the spectrum gated by the K X-ray pulses [9]. The mean correction for discrimination amounted to 7-I-1%.…”