8,018 research outputs found
Monte-Carlo Study of Bound States in a Few-Nucleon System - Method of Continued Fractions -
We propose a new type of Monte-Carlo method which enables us to study the
excited state of many-body systems.Comment: ReVTeX: 25 pages, 10 Postscript figures,2 tables, uses epsf.sty:to be
published in Prog. Theor. Phys. vol.10
Carbon-substitution effect on the electronic properties of MgB single crystals
The electronic properties of the carbon substituted MgB single crystals
are reported. The carbon substitution drops T below 2 K. In-plane
resistivity shows a remarkable increase in residual resistivity by
C-substitution, while the change of in-plane/out-of-plane Hall coefficients is
rather small. Raman scattering spectra indicate that the E-phonon
frequency radically hardens with increasing the carbon-content, suggesting the
weakening of electron-phonon coupling. Another striking C-effect is the
increases of the second critical fields in both in-plane and out-of-plane
directions, accompanied by a reduction in the anisotropy ratio. The possible
changes in the electronic state and the origin of T-suppression by
C-substitution are discussed.Comment: 6 pages, 8 figure
Precise comparison of the Gaussian expansion method and the Gamow shell model
We perform a detailed comparison of results of the Gamow Shell Model (GSM)
and the Gaussian Expansion Method (GEM) supplemented by the complex scaling
(CS) method for the same translationally-invariant cluster-orbital shell model
(COSM) Hamiltonian. As a benchmark test, we calculate the ground state
and the first excited state of mirror nuclei He and Be in
the model space consisting of two valence nucleons in -shell outside of a
He core. We find a good overall agreement of results obtained in these
two different approaches, also for many-body resonances.Comment: 8 pages, 7 figures. Submitted to PR
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