Now showing items 541-550 of 572
Perhaps scalar neutrinos are the lightest supersymmetric partners
(Elsevier, 1984-07-23)
We consider the possibility that the scalar partners of the neutrinos are the least massive supersymmetric partners, and show that this alternative is compatible with cosmological constraints, which put a significant lower ...
Single-scatter Monte Carlo compared to condensed history results for low energy electrons
(Elsevier, 1992-10)
A Monte Carlo code has been developed to simulate individual electron interactions. The code has been instrumental in determining the range of validity for the widely used condensed history method. This task was accomplished ...
Improving emission-computed-tomography quantification by Compton-scatter rejection through offset windows
(Elsevier, 1986-01-15)
Historically in nuclear medicine the acceptance window for total-energy pulse-height has been set to maximize contrast and resolution in the image. Recently, there has been increased emphasis on quantification of digital ...
Pairing models of Pb206, Pb204 and Pb202
(Elsevier, 1964)
Exact eigenstates of the pairing-force Hamiltonian are used to study paring models of Pb206, Pb204 and Pb202. The properties of the eigenstates are discussed as functions of the interaction strength g and numerical results ...
Effect of noise, order and range in fitting the photopeak region of local, Anger-camera energy spectra
(Elsevier, 1990-12-20)
In order to estimate and correct Compton scattering in nuclear-medicine Anger-camera imaging, we have previously required the least-mean-square error between the locally measured energy spectrum and one dependent on a ...
The electron-hole liquid in a polar semiconductor: Cubic SiC
(Elsevier, 1979-01)
The binding energy EB = (17 +/- 3) meV and density n = (9.2 +/- 1.7) x 1018 cm-3 of the EHL in cubic SiC are determined from excitation-dependent spectra. Comparing these values with ground state properties calculated ...
Synthesis of [11C]tetrabenazine, a vesicular monoamine uptake inhibitor, for PET imaging studies
(Elsevier, 1993-04)
Tetrabenazine (TBZ), a high affinity and specific inhibitor of the vesicular monoamine transporter, has been labeled with carbon-11 as a potential probe for in vivo positron emission tomographic imaging of monoaminergic ...
[phi]4 in three dimensions at finite temperature
(Elsevier, 1993-06-21)
We use renormalization-group methods to estimate the critical temperature for [phi]4 theory in three dimensions. We show that, by delineating the range of applicability of perturbation theory, the value of the critical ...
Supercolor
(Elsevier, 1981-12-14)
We propose new types of theories which combine supersymmetry and some new strong interaction which we generically refer to as supercolor. In some cases which we discuss, supercolor is identical with the familiar technicolor. ...
Parton spin asymmetries in polarized hadrons at high energies
(Elsevier, 1986-09-22)
The predictions of perturbative QCD for the evolution of quark and gluon distributions for polarized hadrons, in general, and for polarized protons, in particular, are developed. Analytical and numerical studies suggest ...