H. Ooms

The electric field gradient at iodine impurities in zinc and cadmium

The electric quadrupole interaction at iodine implanted in zinc and cadmium single crystals is investigated, using the β-γ perturbed angular correlation technique. The results show that the implanted129Te and132Te isotopes occupy two well-defined sites, identified by the electric field gradient parameters. One fraction of the impurities is substitutionally implanted, witheqzz=−1.49(9)1018 and −1.58(15)1018V/cm2, in Zn and Cd respectively. The other fraction is identified as an impurity-divacancy configuration with |eqzz|=3.81(8)1018V/cm2; η=0.72(4) for Zn and |eqzz|=3.55(11)1018V/cm2; η=0.53(13) for Cd. The electronic enhancement in the electric fieldgradient at the substitutional site equalsK=−0.66 and −0.56 respectively and follows the empirical trend ofK versus the impurity valence for the s-p elements in Zinc.

Nuclear moments in the doubly odd 132I isotope

Abstract The nuclear moments of the 50 keV, I = 3 + and 278 keV, I = 1 + states in 132 I are measured by perturbed angular correlation techniques, using the quadrupole interaction of iodine in a tellurium matrix and a combined magnetic and electric interaction of iodine in nickel. The results are | Q (3 + )| = 0.23±0.07 b and Q (1 + ) = −0.170±0.006 b and μ (1 + ) = +1.88±0.11 μ N , confirming a [(π g 7 2 )(ν d 3 2 ) −1 ] and a [(π d 5 2 )(ν d 3 2 ) −1 ] configuration for the states concerned.

A special feature of the integral perturbed angular correlation method for the study of the electric quadrupole interaction

A method is discussed to detect the orientation and strength of the quarupole interaction for implanted samples, using an integral perturbed angular correlation. The formulation is applied to the case of129Xe implanted in diamond.

The angular correlation of the 459.7−27.7 kev γ-γ-cascade in129I and its use for a TDPAC

In contrast to earlier measurements, the angular correlation coefficient of the 459.7−27.7 keVγ-γ cascade in129I has been found to be consistent with the mixing ratios of the transitions and equal toA22=−0.0305±0.0037. Further, it is shown that this cascade can be used for time differential hyperfine interaction studies.

The quadrupole interaction at iodine impurities in a tellurium matrix derived from β-γ TDPAC experiments

AbstractTime differential perturbed angular correlation measurements on the implated single crystal system

Quadrupole interaction of vacancy associated impurities in ferromagnetic cubic metals

{}^{129}\mathop {{\text{Te}}}\limits^ \to {\text{Te}}

Quadrupole moments in the doubly odd132I isotope

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