7,792 research outputs found
Rotational alignment near N=Z and proton-neutron correlations
The effects of the residual proton-neutron interactions on bandcrossing
features are studied by means of shell model calculations for nucleons in a
high-j intruder orbital. The presence of an odd-nucleon shifts the frequency of
the alignment of two nucleons of the other kind along the axis of rotation. It
is shown that the anomalous delayed crossing observed in nuclei with aligning
neutrons and protons occupying the same intruder subshell can be partly
attributed to these residual interactions.Comment: 14 pages, including 5 eps figures submitted to Phys. Rev.
Symmetry Breaking by Proton-Neutron Pairing
The symmetries of the and pair-fields are different. The
consequences for rotational spectra are discussed. For , the concept of
spontaneous breaking and subsequent restoration of the isospin symmetry turns
out to be important. It permits us to describe the proton-neutron
pair-correlation within the conventional frame of pairing between like
particles. The experimental data are consistent with the presence of a
field at low spin in nuclei. For a substantial field, the
spectra of even-even and odd-odd nuclei become similar. The
possibility of a rotationally induced pair-field at high spin is
considered.Comment: 7 pages 9 figure
Hybrid Coding Technique for Pulse Detection in an Optical Time Domain Reflectometer
The paper introduces a novel hybrid coding technique for improved pulse detection in an optical time domain reflectometer. The hybrid schemes combines Simplex codes with signal averaging to articulate a very sophisticated coding technique that considerably reduces the processing time to extract specified coding gains in comparison to the existing techniques. The paper quantifies the coding gain of the hybrid scheme mathematically and provide simulative results in direct agreement with the theoretical performance. Furthermore, the hybrid scheme has been tested on our self-developed OTDR
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