نتایج جستجو برای: shell sections
تعداد نتایج: 143387 فیلتر نتایج به سال:
The deuteron break-up exclusive reaction p+ d → N(180) + (NN)(0) is considered in the framework of the one-nucleon-exchange mechanism at the incident proton kinetic energy 0.2–2 GeV and the relative energy of nucleons in the forward going final NN -pair ENN = 0–20 MeV, that is close to the kinematical conditions of the planned experiment at COSY. The off-energy-shell effects resulting, in parti...
A systematic study of high energy, one-neutron removal reactions on 23 neutronrich, psd–shell nuclei (Z = 5−9, A = 12−25) has been carried out. The longitudinal momentum distributions of the core fragments and corresponding single-neutron removal cross sections are reported for reactions on a carbon target. Extended Glauber model calculations, weighted by the spectroscopic factors obtained from...
The electronic properties of heterojunction electron gases formed in GaN/AlGaN core/shell nanowires with hexagonal and triangular cross sections are studied theoretically. We show that at nanoscale dimensions, the nonpolar hexagonal system exhibits degenerate quasi-one-dimensional electron gases at the hexagon corners, which transition to a core-centered electron gas at lower doping. In contras...
M. A. Uddin,* A. K. F. Haque, M. Masum Billah, A. K. Basak, K. R. Karim, and B. C. Saha Department of Physics, University of Rajshahi, Rajshahi-6205, Bangladesh Department of Physics, Illinois State University, Normal, Illinois 61790, USA Department of Physics, Florida A & M University, Tallahassee, Florida 32307, USA sReceived 1 November 2004; revised manuscript received 7 December 2004; publi...
The single ionization of inner-shell electrons by the impact of charged particles is one of the fundamental processes, which is being persistently investigated during last decades. In recent works [1-3], we have deduced the universal scaling laws for differential and total cross sections of the single K-shell ionization by electron and positron impact within the entire non-relativistic energy d...
Subwavelength diameter semiconductor nanowires can support optical resonances with anomalously large absorption cross sections, and thus tailoring these resonances to specific frequencies could enable a number of nanophotonic applications. Here, we report the design and synthesis of core/shell p-type/intrinsic/n-type (p/i/n) Si nanowires (NWs) with different sizes and cross-sectional morphologi...
ar X iv : n uc l - th / 0 10 50 41 v 1 1 7 M ay 2 00 1 Statistical models of nuclear level densities
We present calculations of nuclear level densities that are based upon the detailed microphysics of the interacting shell model yet are also computationally tractable. To do this, we combine in a novel fashion several previously disparate ideas from statistical spectroscopy, namely partitioning of the model space into subspaces, analytic calculations of moments up to fourth order directly from ...
The relaxed-core Hartree-Fock (RCHF) approach to the calculation of E-shell photoionization cross sections is analyzed and applied to I(-shell single-hole ionization in CO. A direct method based on the Schwinger variational principle and single-center-expansion techniques is used to generate the continuum orbitals associated with the motion of the photoelectron in the direct and exchange potent...
Triply-differential cross sections for K-shell ionization by fast electron impact are calculated within the first-order Coulomb Born approximation for the case of a coplanar symmetric geometry. Comparison is made with experimental data on 300 keV and 500 keV eC+Cu, Agand Au. Far the two lightertargetr, the binarypeakregion is reasonably well described by a theory which uses semirelativistic ele...
Cross sections and polarization transfer observables in the O(p ,p8) reactions at 392 MeV were measured at several angles between u lab50° and 14°. The non-spin-flip (DS50) and spin-flip (DS51) strengths in transitions to several discrete states and broad resonances in O were extracted using a model-independent method. The giant resonances in the energy region of Ex519– 27 MeV were found to be ...
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