68,117 research outputs found
Half-lives of -emitters approaching the N=Z line
The half-lives of newly observed -emitters Te and Xe
[Seweryniak \textit{et al.}, Phys. Rev. C \textbf{73}, 061301(R) (2006);
Liddick \textit{et al.}, Phys. Rev. Lett. \textbf{97}, 082501 (2006)] are
investigated by the density-dependent cluster model. The half-lives of
-emitters close to the N=Z line are also studied in a unified framework
where the influence of the nuclear deformation is properly taken into account.
Good agreement between model and data is obtained and some possible
-emitters are suggested for future experiments.Comment: 9 pages, 3 figures, To appear in Phys. Rev.
EPR spectrum via entangled states for an Exchange-Coupled Dimer of Single-Molecule Magnets
Multi-high-frequency electron paramagnetic resonance(EPR) spectrum for a
supermolecular dimer of single-molecule magnets recently reported
[S. Hill, R. S. Edwards, N. Aliaga-Alcalde and G. Christou(HEAC), Science 302,
1015 (2003)] is studied in terms of the perturbation method in which the
high-order corrections to the level splittings of degenerate states are
included. It is shown that the corresponding eigenvectors are composed of
entangled states of two molecules. The EPR-peak positions are calculated in
terms of the eigenstates at various frequencies.
From the best fit of theoretical level splittings with the measured values we
obtain the anisotropy constant and exchange coupling which are in agreement
with the corresponding values of experimental observation. Our study confirms
the prediction of HEAC that the two units within the dimer are coupled
quantum mechanically by the antiferromagnetic exchange interaction and the
supermolecular dimer behaviors in analogy with artificially fabricated quantum
dots.Comment: 16 pages,2 figures, 2 table
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