Time Differential Perturbed Angular γγ-Correlation Studies of Diethylenetriaminepentaacetic Acid Complexes with 111In and 111mCd

L.G. Shpinkovaa, A.W. Carbonarib, S.M. Nikitina and J. Mestnik-Filhob aDepartment of Nuclear Spectroscopy Methods, Institute of Nuclear Physics Lomonosov Moscow State University, Moscow 119899, Russian Federation bInstituto de Pesquisas Energeticas e Nucleares, IPEN-CNEN/SP, P.O. Box 11049, 05422-970, Sao Paulo - SP, Brazil

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Static and dynamic electric quadrupole interactions of 111Cd in complexes with diethylenetriaminepentaacetic acid were studied by the time differential perturbed angular γγ-correlation technique using two parent isotopes, 111In(EC)111Cd and 111mCd. The measurements were carried out using neutral aqueous solutions of the diethylenetriaminepentaacetic-acid-complexes with initial isotopes at 293 K and 77 K. It was shown that the 111Cd-diethylenetriaminepentaacetic-acid-complex in aqueous solutions at pH=7.0 is characterised by the re-orientational correlation time of 7.7x10-11s and an electric field gradient Vzz=6.7(2)x1021 V/m2 with an asymmetry parameter η=0.75(5). A direct comparison of the electric quadrupole interaction parameters for diethylenetriaminepentaacetic- acid-complexes with 111In and 111mCd confirmed the proposal about the fragmentation of the complexes caused by the after-effects of electron capture in 111In. An observed difference in the electric quadrupole interaction parameters obtained for the solutions with 111In and 111mCd complexes reflects a process of a chemical rearrangement of the complex structure after the In decay into Cd.

DOI: 10.12693/APhysPolA.100.799 PACS numbers: 23.20.En, 23.40.--s, 61.66.Hq