It is demonstrated for the three-dimensional three-particle system that a divergence arising from essentially the same singularity structure of the kernel of the scattering integral equation is responsible for both the EAmov and Thomas e6ects. The above divergence implies that the results of a three-particle dynamical calculation will be sensitive to the details of the two-particle interaction.In two-dimensional systems, the above divergence is absent and consequently the three-particle observables become essentially independent of the two-particle interaction model.
We present the results of two separate measurements of the half-life of 44 Ti relative to those of 22 Na and 207 Bi, respectively. By comparing the numbers of 1157-keV ␥ rays from 44 Ti to those of 1274-keV ␥ rays from 22 Na observed from a mixed source over a period of approximately 2 yr, we determined the half-life of 44 Ti to be 61.5Ϯ1.0 yr. From an approximately 1-yr-long study of another mixed source, where we compared the numbers of 1157-keV ␥ rays from 44 Ti to those of 1064-keV ␥ rays from 207 Bi, we determined the 44 Ti half-life to be 62Ϯ5 yr. From these two results, we have obtained a best value of 62Ϯ2 yr for the half-life of 44 Ti. The astrophysical implications of this result are discussed.
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