Internal Conversion, Multipole Mixing, and Auger Spectrum in Zn^{67} from Ga^{67} Decay
Abstract
Absolute internalconversion coefficients measured with high electron resolution and with a Ge(Li) spectrometer have been studied in seven transitions in Zn^{67} from 78h Ga^{67} decay. From these and from L subshell ratios for the three lowest energy transitions, we deduce the following multipolarities: 93 keV, pure E2184 keV,M1+(812% E2) all others predominantly M1, with E2 required in the 91 and 494keV transitions. The retardation factor of the lallowed 91keV transition is 500, which is larger than that (340) for the lforbidden 184keV transition (E2component enhancement of 17) originating at the same level. Conversion data, together with a reanalysis of γγ angularcorrelation measurements of Rietjens and Van den Bold, lead unambiguously to the following level spin assignments, in agreement with those from (d,p) stripping and Coulomb excitation: (keV,Jπ) ground state 52; 93.317+/0.02, 1/2  184.595+/0.04,32393.59+/0.04,32887.87+/0.1,32. Conversion coefficients show somewhat better agreement with those calculated by Sliv and Band (extrapolated from Z=33) than with those of Rose for the L shell, but indicate that both computations give Lshell coefficients too small (~10% for Sliv and Band, ~20% for Rose) for this Z range. The empirical Z displacement rule for M_{I} conversion due to Chu and Perlman (∆Z=7.0), which, applied to the unscreened, pointnucleus M conversion values of Rose gives agreement for all energies and multipolarities above Z=50, is found to require ∆Z=9.5 for agreement at Z=30. Six of nine predicted lines in the KLL Auger spectrum of Zn are resolved; energies determined are 713 eV above those calculated by Hörnfeldt, and intensities agree with recent experimental results at Z=32 except for the KL_{1}L_{3}(^{3}P_{1}) line, where our intensity is lower by a factor of 2.
 Publication:

Physical Review
 Pub Date:
 November 1966
 DOI:
 10.1103/PhysRev.151.886
 Bibcode:
 1966PhRv..151..886F