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40 papers · 1 filter
Splitting of the Dipole and Spin-Dipole Resonances
Sam M. Austin, E. Adamides, A. Galonsky +10
Cross sections for the 90,92,94Zr(p,n) reactions were measured at energies of 79.2 and 119.4 MeV. A phenomenological model was developed to describe the variation with bombarding e…
Efficient tight-binding Monte Carlo structural sampling of complex materials
Parthapratim Biswas, G. T. Barkema, Normand Mousseau +1
While recent work towards the development of tight-binding and ab-initio algorithms has focused on molecular dynamics, Monte Carlo methods can often lead to better results with rel…
New Perspectives on Cooling Flows and Cluster Radio Sources
B. R. McNamara, M. W. Wise, L. P. David +2
We discuss new results from the Chandra X-ray Observatory and XMM-Newton on cluster cooling flows, emphasizing early results from our Chandra programs. We find cooling rates reduce…
Strain Relaxation Mechanisms and Local Structural Changes in Si_{1-x}$Ge_{x} Alloys
Ming Yu, C. S. Jayanthi, David A. Drabold +1
In this work, we address issues pertinent to the understanding of the structural and electronic properties of Si_{1-x} Ge_{x}alloys, namely, (i) how does the lattice constant misma…
Interaction potential between dynamic dipoles: polarized excitons in strong magnetic fields
M. A. Olivares-Robles, S. E. Ulloa
The interaction potential of a two-dimensional system of excitons with spatially separated electron-hole layers is considered in the strong magnetic field limit. The excitons are a…
A Young Stellar Cluster in the Nucleus of NGC 4449
T. Boeker, R. P. van der Marel, L. Mazzuca +4
We have obtained 1-2 A resolution optical Echellette spectra of the nuclear star cluster in the nearby starburst galaxy NGC 4449. The light is clearly dominated by a very young (6-…