1,542 research outputs found
X-radiation of the moon and Roentgen cosmic background according to data of AMS ''Luna-12''
Satellite measurements of lunar soft X radiation, and Roentgen cosmic backgroun
Quantum conductivity corrections in two dimensional long-range disordered systems with strong spin-orbit splitting of electron spectrum
We study quantum corrections to conductivity in a 2D system with a smooth
random potential and strong spin-orbit splitting of the spectrum. We show that
the interference correction is positive and down to the very low temperature
can exceed the negative correction related to electron-electron interactions.
We discuss this result in the context of the problem of the metal-insulator
transition in Si-MOSFET structures.Comment: 8 pages, no figure
On relativistic approaches to the pion self-energy in nuclear matter
We argue that, in contrast to the non-relativistic approach, a relativistic
evaluation of the nucleon--hole and delta-isobar--nucleon hole contributions to
the pion self-energy incorporates the s-wave scattering, which requires a more
accurate evaluation. Therefore relativistic approach containing only these
diagrams does not describe appropriately the pion self-energy in isospin
symmetric nuclear matter. We conclude that, a correct relativistic approach to
the pion self-energy should involve a more sophisticated calculation in order
to satisfy the known experimental results on the near-threshold behaviour of
the pion-nucleon (forward) scattering amplitude.Comment: 7 pages,1 figur
Scaling in activated escape of underdamped systems
Noise-induced escape from a metastable state of a dynamical system is studied
close to a saddle-node bifurcation point, but in the region where the system
remains underdamped. The activation energy of escape scales as a power of the
distance to the bifurcation point. We find two types of scaling and the
corresponding critical exponents.Comment: 9 page
P- and T-violating Schiff moment of the Mercury nucleus
The Schiff moment of the Hg nucleus was calculated using finite range
P- and T-violating weak nucleon-nucleon interaction. Effects of the core
polarization were considered in the framework of RPA with effective residual
forces.Comment: 10 pages and 2 figures,to appear in Yad. Fi
Schiff moment of the Mercury nucleus and the proton dipole moment
We calculated the contribution of internal nucleon electric dipole moments to
the Schiff moment of Hg. The contribution of the proton electric dipole
moment was obtained via core polarization effects that were treated in the
framework of random phase approximation with effective residual forces. We
derived a new upper bound cm of the proton
electric dipole moment.Comment: 4 pages, 2 figures, RevTex
Theory of microwave-induced oscillations in the magnetoconductivity of a 2D electron gas
We develop a theory of magnetooscillations in the photoconductivity of a
two-dimensional electron gas observed in recent experiments. The effect is
governed by a change of the electron distribution function induced by the
microwave radiation. We analyze a nonlinearity with respect to both the dc
field and the microwave power, as well as the temperature dependence determined
by the inelastic relaxation rate.Comment: Extended version of cond-mat/0310668. 12 pages, 4 figures. V2:
published version (minor changes, Fig. 4 corrected, references added
Nuclear Magnetic Quadrupole Moments in Single Particle Approximation
A static magnetic quadrupole moment of a nucleus, induced by T- and P-odd
nucleon-nucleon interaction, is investigated in the single-particle
approximation. Models are considered allowing for analytical solution. The
problem is also treated numerically in a Woods-Saxon potential with spin-orbit
interaction. The stability of results is discussed.Comment: LATEX, 9 pages, 1 postscript figure available upon request from
"[email protected]". BINP 94-4
Universal limiting shape of worn profile under multiple-mode fretting conditions: theory and experimental evidence
We consider multiple-mode fretting wear in a frictional contact of elastic bodies subjected to a small-amplitude oscillation, which may include in-plane and out-of-plane translation, torsion and tilting (“periodic rolling”). While the detailed kinetics of wear depends on the particular loading history and wear mechanism, the final worn shape, under some additional conditions, occurs to be universal for all types and loading and wear mechanisms. This universal form is determined solely by the radius of the permanent stick region and the maximum indentation depth during the loading cycle. We provide experimental evidence for the correctness of the theoretically predicted limiting shape. The existence of the universal limiting shape can be used for designing joints which are resistant to fretting wear
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