Internal conversion coefficients ofM4 transitions in125m, 127m, 129mTe decay

Abstract

The internal conversion coefficients have been measured using a high resolution low energy Ge(Li) detector for the following M4 transitions: lZSTe: 109.27 keV transition c~r=357_+ 11; RG method, ~27Te: 88.26 keV transition c~K=484+23; XPG method, ~29Te: 105.50 keV transition ~t~ = 213 + 10; XPG method.It is observed that these values are lower by 2.5-3.6% as compared with Hager and Seltzer's calculations. A comparison between experimental and theoretical eK and ~r values for eleven M4 transitions shows that the experimental values are systematically lower.

Precise measurement of alpha_K and alpha_T for the 109.3-keV M4 transition in 125Te: Test of internal-conversion theory

“…The first of these results, published in 1952, is statistically consistent with ours but the three more recent ones, appearing between 1977 and 1998, are lower by two or more of their standard deviations. In the case of α T 109 , the previous results are 357 (11) [17], 304 (17) [14] and 318(40) [16]. Once again, the earliest measurement, from 1977, is consistent with our result, as is the most recent 1998 result.…”

“…First, the difference in calculated α K values between models that do and do not include the vacancy is 3.4%, a small but experimentally discernible amount; and second, previous measurements [12][13][14][15][16] have consistently produced results that were significantly lower than both model calculations. The measured α T values have been more scattered but also tended to be low [14,16,17]. Of all these published measurements, the first appeared in 1952 and none is more recent than 1998, so it is reasonable to ask if these ICCs in 125 Te are really anomalous or simply victims of past experimental limitations.…”

Precise measurement of αK and αT for the 109.3-keV M4 transition in Nica1, Hardy2, Iacob3 et al. 2017Phys. Rev. C6040View full textAdd to dashboardCite

“…The first of these results, published in 1952, is statistically consistent with ours but the three more recent ones, appearing between 1977 and 1998, are lower by two or more of their standard deviations. In the case of α T 109 , the previous results are 357 (11) [17], 304(17) [14] and 318(40) [16]. Once again, the earliest measurement, from 1977, is consistent with our result, as is the most recent 1998 result.…”

“…First, the difference in calculated α K values between models that do and do not include the vacancy is 3.4%, a small but experimentally discernible amount; and second, previous measurements [12][13][14][15][16] have consistently produced results that were significantly lower than both model calculations. The measured α T values have been more scattered but also tended to be low [14,16,17]. Of all these published measurements, the first appeared in 1952 and none is more recent than 1998, so it is reasonable to ask if these ICCs in 125 Te are really anomalous or simply due to past experimental limitations.…”

Precise measurement of αK for the 88.2-keV M4 transition in Te127 : Test of internal-con

“…The calculation of α K for this transition depends appreciably on whether the atomic vacancy is accounted for, there being a 3.7% difference between the values obtained with and without inclusion of the vacancy. The only previous reported measurement of the α K value [13] had an uncertainty of ±5%, which overlaps both calculated values. Our new result has ±1.2% precision and clearly distinguishes between the two options.…”