Table of electronic factors for E0 electron and electron–positron pair conversion transitions

Abstract

A new tabulation of electronic factors is reported for electron conversion for elements of Z from 5 to 126 and electronic factors for electron-positron pair conversion for elements of even Z from 4 to 100.The electronic factors for electron conversion, Ω CE (E0), were calculated using a modified version of the CATAR program developed by Pauli and Raff with a relativistic-Hartree-Fock-Slater approach (Comp. Phys. Comm. 9 (1975) 392). The electronic factors for electron-positron pair conversion, Ω IP F (E0), were calculated using the model developed by Wilkinson (Nucl. Phys. A133 (1969) 1). The data tables presented here cover all atomic shells up to R2 and transition energies from 1 keV to 6000 keV and from 1100 keV to 8000 keV for pair conversion. A comparison with previous electronic factor tabulations is presented. Ratios of experimental Ω(E0) values for 83 E0 transitions in 8 ≤ Z ≤ 98 are compared to this tabulation. Two examples of how to use the tabulation to extract E0 strengths are also included.

Improved measurement of the 02+→01+E0 transition strength for Smallcombe1, Garnsworthy2, Körten3 et al. 2022Phys. Rev. C5000View full textAdd to dashboardCite

“…Values of α = 2.42(4) and α K = 2.042 (35) are taken from BrIccS v2.3d [26]. Electronic factors Tot = 3.46(17) × 10 8 and K = 3.09(15) × 10 8 are from the latest masscorrected relativistic calculations [34,35].…”

Evidence for shape coexistence in 52Cr through conversion-electron and pair-conversion spectroscopy

“…Table 1 shows the E0 strengths determined in this work. These use the determined detector efficiencies, adopted values for the transition mixing ratios, branching ratios, and state lifetimes from Nuclear Data Sheets [22], conversion coefficients from the BrIcc database [23], electronic factors from the recent tabulation [24], and the measured conversion-electron and electron-positron pair intensities from the present work. Unfortunately, without a lifetime for the 2647-keV first-excited 0 + state in 52 Cr, the E0 transition strength cannot be determined [15].…”

Electric monopole transition from the superdeformed band in $^{40}$Ca

“…where the Ω j terms are electronic factors associated with atomic shells (K, L 1 , ...). For both electron and e + e − pair conversion (π) they depend on the atomic number and transition energy; numerical evaluations are available [33,34]. The electron conversion contributions to the E0 transitions considered here are <0.6% (0 + 2 → 0 + 1 and 0 + 3 → 0 + 1 ) and 11% (0…”