1,469 research outputs found
Profiling a set of personality traits of text author: what our words reveal about us
Authorship profiling, i.e. revealing information about an unknown author by analyzing their text, is a task of growing importance. One of the most urgent problems of authorship profiling (AP) is selecting text parameters which may correlate to an author’s personality. Most researchers’ selection of these is not underpinned by any theory. This article proposes an approach to AP which applies neuroscience data. The aim of the study is to assess the probability of self-destructive behaviour of an individual via formal parameters of their texts. Here we have used the “Personality Corpus”, which consists of Russian-language texts. A set of correlations between scores on the Freiburg Personality Inventory scales that are known to be indicative of self-destructive behaviour (“Spontaneous Aggressiveness”, “Depressiveness”, “Emotional Lability”, and “Composedness”) and text variables (average sentence length, lexical diversity etc.) has been calculated. Further, a mathematical model which predicts the probability of self-destructive behaviour has been obtained
Impact of pion dynamics on nuclear shell structure
Spin-isospin response in exotic nuclear systems is investigated. It is found
that in some nuclei excitations with pionic quantum numbers (0-, 1+, 2-, ...)
appear at very low energies with large transition probabilities, which is an
indication of the vicinity of the onset of pion condensation. As an example, 2-
components of the spin-dipole resonance in 78-Ni and 132-Sn are considered. The
existence of such modes points out to the necessity of taking into account
their coupling to other elementary modes of excitation, e.g.
single-quasiparticle ones. This coupling is introduced in the theory for the
first time. Thereby, pion-exchange contribution to the nucleon-nucleon
interaction is included in the relativistic framework beyond the Hartree-Fock
approximation. Namely, classes of Feynman diagrams are selected according to
their significance for nuclear spectroscopic characteristics, such as
single-particle energies and strength functions, and included into the
nucleonic self-energy in all orders of meson-exchange. As an illustration, the
impact of these new contributions on the single-particle energies of 100-Sn is
discussed.Comment: 5 pages, 3 figures; a Contribution to the Proceedings of the
International Nuclear Physics Conference 'Nuclear Structure and Dynamics III
Nuclear response theory for spin-isospin excitations in a relativistic quasiparticle-phonon coupling framework
A new theoretical approach to spin-isospin excitations in open-shell nuclei
is presented. The developed method is based on the relativistic meson-exchange
nuclear Lagrangian of Quantum Hadrodynamics and extends the response theory for
superfluid nuclear systems beyond relativistic quasiparticle random phase
approximation in the proton-neutron channel (pn-RQRPA). The coupling between
quasiparticle degrees of freedom and collective vibrations (phonons) introduces
a time-dependent effective interaction, in addition to the exchange of pion and
-meson taken into account without retardation. The time-dependent
contributions are treated in the resonant time-blocking approximation, in
analogy to previously developed relativistic quasiparticle time blocking
approximation (RQTBA) in the neutral (non-isospin-flip) channel. The new method
is called proton-neutron RQTBA (pn-RQTBA) and applied to Gamow-Teller resonance
in a chain of neutron-rich Nickel isotopes Ni. A strong fragmentation
of the resonance along with quenching of the strength, as compared to pn-RQRPA,
is obtained. Based on the calculated strength distribution, beta-decay
half-lives of the considered isotopes are computed and compared to pn-RQRPA
half-lives and to experimental data. It is shown that a considerable
improvement of the half-life description is obtained in pn-RQTBA because of the
spreading effects, which bring the lifetimes to a very good quantitative
agreement with data.Comment: 14 pages, 11 figures. v3: convergence study added, other minor
corrections and references added, version accepted for publication in The
European Physical Journal A as part of the topical issue "Finite range
effective interactions and associated many-body methods - A tribute to Daniel
Gogny". The final publication is available at Springer via
http://dx.doi.org/10.1140/epja/i2016-16205-
Microscopic description of nuclear vibrations: Relativistic QRPA and its extensions with quasiparticle-vibration coupling
The recent extensions of the covariant energy density functional theory with
the quasiparticle-vibration coupling (QVC) are reviewed. Formulation of the
Quasiparticle Random Phase Approximation (QRPA) in the relativistic framework
is discussed. Self-consistent extensions of the relativistic QRPA imply the QVC
which is implemented in two-body propagators in the nuclear medium. This
provides fragmentation of the QRPA states describing the damping of the
vibrational motion.Comment: Published in "50 Years of Nuclear BCS", edited by R. A. Broglia and
V.G. Zelevinsky, World Scientific (2013
Quasiparticle-vibration coupling effects on nuclear transitions of astrophysical interest
The relativistic quasiparticle time-blocking approximation (RQTBA) is applied
to the description of nuclear excitation modes of astrophysical interest. This
method is based on the meson-nucleon Lagrangian and goes beyond the standard
relativistic quasiparticle random-phase approximation (RQRPA) by treating the
coupling between single quasiparticles and collective vibrations of the
nucleus. We calculate electric dipole transitions and Gamow-Teller modes in the
(p,n) direction in a few Sn isotopes and obtain the rates of (n,)
reaction and -decay processes, which govern the r-process
nucleosynthesis, in a unified RQTBA framework. Gamow-Teller transitions in the
(n,p) branch, which in principle can serve for the modeling of stellar
evolution, are also investigated, and Zr is taken as a study case.Comment: 10 pages, 8 figures. Contribution to the proceedings of the Fifth
Conference on Nuclei and Mesoscopic Physics (NMP17), East Lansing, USA, March
6-10, 201
- …