1,105 research outputs found
New correlations induced by nuclear supersymmetry
We show that the nuclear supersymmetry model (n-susy) in its extended
version, predicts correlations in the nuclear structure matrix elements which
characterize transfer reactions between nuclei that belong to the same
supermultiplet. These correlations are related to the fermionic generators of
the superalgebra and if verified experimentally can provide a direct test of
the model.Comment: Invited talk at "Nuclear Physics: Large and Small", April 19-22,
2004, Hacienda Cocoyoc, Mexic
Everything you always wanted to know about SUSY, but were afraid to ask
New experimental tests of nuclear supersymmetry are suggested. They involve
the measurement of one- and two-nucleon transfer reactions between nuclei that
belong to the same supermultiplet. These reactions provide a direct test of the
`fermionic' sector, i.e. of the operators that change a boson into a fermion or
vice versa. We present some theoretical predictions for the supersymmetric
quartet of nuclei: 194Pt, 195Pt, 195Au and 196Au.Comment: 8 pages, 2 figures, proceedings of `Symmetries in Nuclear Structure',
March 23-29, 2003, Erice, Ital
How good are the Garvey-Kelson predictions of nuclear masses?
The Garvey-Kelson relations are used in an iterative process to predict
nuclear masses in the neighborhood of nuclei with measured masses. Average
errors in the predicted masses for the first three iteration shells are smaller
than those obtained with the best nuclear mass models. Their quality is
comparable with the Audi-Wapstra extrapolations, offering a simple and
reproducible procedure for short range mass predictions. A systematic study of
the way the error grows as a function of the iteration and the distance to the
known masses region, shows that a correlation exists between the error and the
residual neutron-proton interaction, produced mainly by the implicit assumption
that varies smoothly along the nuclear landscape.Comment: 10 pages, 18 figure
Eigenvalue correlations and the distribution of ground state angular momenta for random many-body quantum systems
The observed preponderance of ground states with angular momentum L=0 in many-body quantum systems with random two-body interactions is analyzed in terms of correlation coefficients (covariances) among different eigenstates. It is shown that the geometric analysis of Chau can be interpreted in terms of correlations (covariances) between energy eigenvalues, thus providing an entirely statistical explanation of the distribution of ground state angular momenta of randomly interacting quantum systems that, in principle, is valid for both fermionic and bosonic systems. The method is illustrated for the interacting boson model
El Acuerdo comercial de la Comunidad Económica Europea con la Argentina y su correlación con los celebrados en otros países latinoamericanos
Boson-conserving one-nucleon transfer operator in the interacting boson model
The boson-conserving one-nucleon transfer operator in the interacting boson
model (IBA) is reanalyzed. Extra terms are added to the usual form used for
that operator. These new terms change generalized seniority by one unit, as the
ones considered up to now. The results obtained using the new form for the
transfer operator are compared with those obtained with the traditional form in
a simple case involving the pseudo-spin Bose-Fermi symmetry in its limit. Sizeable differences are
found. These results are of relevance in the study of transfer reactions to
check nuclear supersymmetry and in the description of (\beta)-decay within IBA.Comment: 13 pages, 1 table, 0 figures. To be published in Phys. Rev.
Spectral Engineering with Coupled Microcavities: Active Control of Resonant Mode-Splitting
Optical mode-splitting is an efficient tool to shape and fine-tune the
spectral response of resonant nanophotonic devices. The active control of
mode-splitting, however, is either small or accompanied by undesired resonance
shifts, often much larger than the resonance-splitting. We report a control
mechanism that enables reconfigurable and widely tunable mode-splitting while
efficiently mitigating undesired resonance shifts. This is achieved by actively
controlling the excitation of counter-traveling modes in coupled resonators.
The transition from a large splitting (80 GHz) to a single-notch resonance is
demonstrated using low power microheaters (35 mW). We show that the spurious
resonance-shift in our device is only limited by thermal crosstalk and
resonance-shift-free splitting control may be achieved.Comment: 4 pages, 3 figure
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