3,260 research outputs found
Baryon octupole moments
We report on a calculation of higher electromagnetic multipole moments of
baryons in a non-covariant quark model approach. The employed method is based
on the underlying spin-flavor symmetry of the strong interaction and its
breaking.We present results on magnetic octupole moments of decuplet baryons
and discuss their implications.Comment: 3 page
Outflanking and securely using the PIN/TAN-System
The PIN/TAN-system is an authentication and authorization scheme used in
e-business. Like other similar schemes it is successfully attacked by
criminals. After shortly classifying the various kinds of attacks we accomplish
malicious code attacks on real World Wide Web transaction systems. In doing so
we find that it is really easy to outflank these systems. This is even
supported by the users' behavior. We give a few simple behavior rules to
improve this situation. But their impact is limited. Also the providers support
the attacks by having implementation flaws in their installations. Finally we
show that the PIN/TAN-system is not suitable for usage in highly secure
applications.Comment: 7 pages; 2 figures; IEEE style; final versio
Dibaryon Condensate in Nuclear Matter and Neutron Stars: Exact Analysis in One-Dimensional Models
We investigate dense nuclear matter with a dibaryon Bose-Einstein condensate
as a possible intermediate state before the quark-gluon phase transition. An
exact analysis of this state of matter is presented in a one-dimensional model.
The analysis is based on a reduction of the quantization rules for the N-body
problem to N coupled algebraic transcendental equations. We observe that when
the Fermi momentum approaches the resonance momentum, the one-particle
distribution function increases near the Fermi surface. When the Fermi momentum
is increased beyond the resonance momentum, the equation of state becomes
softer. The observed behavior can be interpreted in terms of formation of a
Bose-Einstein condensate of two-fermion resonances (dibaryons). In cold nuclear
matter, it should occur if 2(m_N + epsilon_F) is greater or equal to m_D, where
m_N and m_D are respectively the nucleon and dibaryon masses and epsilon_F is
the nucleon Fermi energy.Comment: 25 pages, LaTeX, 2 Postscript figures, to appear in Annals of Physic
- …