31,929 research outputs found
Stationary scattering theory on mainifolds, I
We study spectral theory for the Schrodinger operator on manifolds possessing
an escape function. A particular class of examples are manifolds with Euclidean
and/or hyperbolic ends.Comment: pp 3
Spin-Polarization Response Functions in High-Energy (e,e'p) Reactions
Spin-polarization response functions are examined for high-energy
reaction by computing the full 18 response functions for
the proton kinetic energy 0.515 GeV and 3.179 GeV with an 16O target.
The Dirac eikonal formalism is applied to account for the final-state
interactions. The formalism is found to yield the response functions in good
agreement with those calculated by the partial-wave expansion method at 0.515
GeV. We identify the response functions that depend on the spin-orbital
potential in the final-state interactions, but not on the central potential.
Dependence on the Dirac- or Pauli-type current of the nucleon is investigated
in the helicity-dependent response functions, and the normal-component
polarization of the knocked-out proton, , is computed.Comment: 22 pages, Latex, figures available at
ftp://ftp.krl.caltech.edu/pub/users/rseki/it
Dynamical breakdown of the Ising spin-glass order under a magnetic field
The dynamical magnetic properties of an Ising spin glass
FeMnTiO are studied under various magnetic fields. Having
determined the temperature and static field dependent relaxation time
from ac magnetization measurements under a dc bias field by a
general method, we first demonstrate that these data provide evidence for a
spin-glass (SG) phase transition only in zero field. We next argue that the
data of finite can be well interpreted by the droplet theory
which predicts the absence of a SG phase transition in finite fields.Comment: 4 pages, 5 figure
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