Now showing items 61-70 of 598
Feasibility of sharpening limited-angle tomography by including an orthogonal set of projections
(Elsevier, 1982-02-15)
In single photon emission nuclear medicine, computed tomography systems that employ only a limited angular range of projection data suffer from blurring in the depth (or z) direction. With simulated data, we show that ...
A monitor for gamma radiation at zero degrees from the SLC collision point
(Elsevier, 1989-05-01)
Bremsstrahlung gamma rays are emitted in a narrow forward cone while the electron and positron beams are being measured with carbon fibers at the SLC (the linear collider at the Stanford Linear Accelerator Center). Beam-beam ...
The coupling of valence shell and particle-hole degrees of freedom in a partial random phase approximation
(Elsevier, 1987-03-02)
It is well known that the random phase approximation breaks down in the absence of a substantial energy gap between occupied and unoccupied single-particle states. Particle-hole excitations are then inevitably accompanied ...
The weak coupling model applied to the nuclei with A = 16-19: (I). Energy levels
(Elsevier, 1970-03-31)
We have formulated particle-hole states by coupling in J and T eigenfunctions resulting from diagonalization of (sd)n1 and pn2. A central particle-hole interaction is assumed and the results for the negative parity levels ...
The construction of the L3 experiment
(Elsevier, 1990-04-01)
The L3 experiment is one of the six large detectors designed for the new generation of electron-positron accelerators. It is the only detector that concentrates its efforts on limited goals of measuring electrons, muons ...
On the bound states of the massless free field in two space-time dimensions
(Elsevier, 1976-12-06)
We point out the peculiar kinematics of zero-mass fields in two space-time dimensions by showing that the n-fold tensor product of one-particle representations of the Poincare group for n [ges] 2 contains a countable ...
On the completeness of the analysis of third and fourth spectra of the iron group, and the spectra of early B stars
(Elsevier, 1988-04-02)
The spectroscopic analysis of normal, early B stars requires a sound atomic data base, especially for the third and fourth spectra of the iron-group elements. We review the present status of the term analyses of third and ...
Oxidation of substituted 4-fluorobenzaldehydes: Application to the no-carrier-added syntheses of 4-[18F]fluoroguaiacol and 4-[18F]fluorocatechol
(Elsevier, 1991)
The synthesis of 4-[18F]fluoroguaiacol (4-[18F]fluoro-2-methoxyphenol) has been achieved in no-carrier-added form starting from 2-methoxy-4-nitrobenzaldehyde, using nucleophilic aromatic substitution by [18F]fluoride ...
A description of drift chambers used in a Fermilab experiment
(Elsevier, 1976-11-01)
We give a detailed description of the drift chamber system used in a charm search at Fermilab. All important aspects of design and performance are discussed.
Synthesis of a [11C]Methoxy derivative of [alpha]-Dihydrotetrabenazine: a radioligand for studying the vesicular monoamine transporter
(Elsevier, 1993-12)
The synthesis of [11C]TBZOMe, a [11C]methoxy derivative at the 2-hydroxy position of [alpha]-dihydrotetrabenazine, was carried out by an O-[11C]methylation reaction. The product [11C]TBZOMe (100-200 mCi) was obtained in ...