Update of Internal Conversion Coefficient Measurement: 150.8-keV, E3 transition in 111m Cd TEXAS A&M PROGRAM TO MEASURE ICC N. NICA Internal Conversion.

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Update of Internal Conversion Coefficient Measurement: keV, E3 transition in 111m Cd TEXAS A&M PROGRAM TO MEASURE ICC N. NICA Internal Conversion Coefficients (ICC): Big impact on quality of nuclear science Central for NSDD and other nuclear data programs Intensely studied by theory and experiment Important result: hole calculation now standard

2002RA45 survey ICC’s theories and measurements Theory: RHFS and RDF comparison Exchange interaction, Finite size of nucleus, Hole treatment Experiment: 100 E2, M3, E3, M4, E5 ICC values, 0.5%-6% precision, very few <1% precision! Conclusions, Δ(exp:theory)%: No hole:+0.19(26)% BEST! (bound and continuum states - SCF of neutral atom) Hole-SCF:-0.94(24)% (continuum - SCF of ion + hole (full relaxation of ion orbitals)) Hole-FO:-1.18(24)% (continuum - ion field from bound wave functions of neutral atom (no relaxation of ion orbitals)) PHYSICAL ARGUMENT K-shell filling time vs. time to leave atom ~ – s » ~ s

2002Ra45: 100 α K (exp) cases compared with ‘hole FO’ calculations

Overview of the scope and completeness of the method There is no criterion to reach the scope of comparison between ICC theories “with hole” and “no hole” except for measuring precisely as many relevant cases as practically possible

The difference Δ K between α K (‘hole’) and α K (‘no hole’) (relative to α K (‘hole’)) as function of kinetic energy of converted electron E K

Overview of the scope and completeness of the method Is the series of measurements complete? 1.Re-measure ‘main set’ of 100 cases 2.Measure other cases 3.Abnormal results 4.High uncertainties 5.Experiment: about 1-2% precision 6. Theory: Δ K = 7-10%, Δ K = 4-7% 7.Well spread on nuclear chart

127m Te 88.3 keV, M4 transition -  K measurement Cytran simulation of scattering

109 Cd Efficiency Calibration 22.6-keV AgKx & 88.0-keV E3 γ regions

111m Cd keV, E3 transition -  K measurement Impurity analysis S2, sp. 1 ImpurityContribution to Cd KX rays 111m Cd11.24%0.21% 115 Cd2.26%0.08% 117 Cd0.113%0.012% 117 In0.21%0.03% 117m In0.467%0.009% 116m In0.0063%0.0011% Total14.30%0.22% S2, sp. 2 ImpurityContribution to Cd KX rays 111m Cd11.20%0.20% 115 Cd3.12%0.07% 117 Cd0.145%0.010% 117 In0.24%0.03% 117m In0.559%0.006% 116m In0.0069%0.0011% Total15.27%0.22% S2, sp. 3 ImpurityContribution to Cd KX rays 111m Cd11.10%0.20% 115 Cd5.57%0.11% 117 Cd0.188%0.012% 117 In0.39%0.05% 117m In0.873%0.007% 116m In0.0045%0.0012% Total18.12%0.24% S1, sp. 1 ImpurityContribution to Cd KX rays 111m Cd11.26%0.21% 115 Cd2.07%0.08% 117 Cd0.130%0.014% 117 In0.21%0.03% 117m In0.689%0.010% 116m In0.0124%0.0020% Total14.37%0.22%