7,235 research outputs found
Experimental effects on dynamics and thermodynamics in nuclear reactions on the symmetry energy as seen by the CHIMERA 4 detector
Heavy ion collisions have been widely used in the last decade to constraint
the parameterizations of the symmetry energy term of nuclear equation of state
(EOS) for asymmetric nuclear matter as a function of baryonic density. In the
Fermi energy domain one is faced with variations of the density within a narrow
range of values around the saturation density =0.16 fm down
towards sub-saturation densities. The experimental observables which are
sensitive to the symmetry energy are constructed starting from the detected
light particles, clusters and heavy fragments that, in heavy ion collisions,
are generally produced by different emission mechanisms at different stages and
time scales of the reaction. In this review the effects of dynamics and
thermodynamics on the symmetry energy in nuclear reactions are discussed and
characterized using an overview of the data taken so far with the CHIMERA
multi-detector array.Comment: 21 pages, 25 figures. Review to appear in EPJA special volume on
nuclear symmetry energ
Entanglement entropy and the determination of an unknown quantum state
An initial unknown quantum state can be determined with a single measurement
apparatus by letting it interact with an auxiliary, "Ancilla", system as
proposed by Allahverdyan, Balian and Nieuwenhuizen [Phys. Rev. Lett. 92, 120402
(2004)]. In the case of two qubits, this procedure allows to reconstruct the
initial state of the qubit of interest S by measuring three commuting
observables and therefore by means of a single apparatus, for the total system
S + A at a later time. The determinant of the matrix of the linear
transformation connecting the measurements of three commuting observables at
time t > 0 to the components of the polarization vector of S at time t = 0 is
used as an indicator of the reconstructability of the initial state of the
system S. We show that a connection between the entanglement entropy of the
total system S + A and such a determinant exists, and that for a pure state a
vanishing entanglement individuates, without a need for any measurement, those
intervals of time for which the reconstruction procedure is least efficient.
This property remains valid for a generic dimension of S. In the case of a
mixed state this connection is lost.Comment: 5 pages 2 figures, accepted for publication on Physical Review
High-finesse optical quantum gates for electron spins in artificial molecules
A doped semiconductor double-quantum-dot molecule is proposed as a qubit
realization. The quantum information is encoded in the electron spin, thus
benefiting from the long relevant decoherence times; the enhanced flexibility
of the molecular structure allows to map the spin degrees of freedom onto the
orbital ones and vice versa, and opens the possibility for high-finesse
(conditional and unconditional) quantum gates by means of stimulated Raman
adiabatic passage.Comment: To appear in Phys. Rev. Let
Dynamic test/analysis correlation using reduced analytical models
Test/analysis correlation is an important aspect of the verification of analysis models which are used to predict on-orbit response characteristics of large space structures. This paper presents results of a study using reduced analysis models for performing dynamic test/analysis correlation. The reduced test-analysis model (TAM) has the same number and orientation of DOF as the test measurements. Two reduction methods, static (Guyan) reduction and the Improved Reduced System (IRS) reduction, are applied to the test/analysis correlation of a laboratory truss structure. Simulated test results and modal test data are used to examine the performance of each method. It is shown that selection of DOF to be retained in the TAM is critical when large structural masses are involved. In addition, the use of modal test results may provide difficulties in TAM accuracy even if a large number of DOF are retained in the TAM
Diffusion of scientific credits and the ranking of scientists
Recently, the abundance of digital data enabled the implementation of graph
based ranking algorithms that provide system level analysis for ranking
publications and authors. Here we take advantage of the entire Physical Review
publication archive (1893-2006) to construct authors' networks where weighted
edges, as measured from opportunely normalized citation counts, define a proxy
for the mechanism of scientific credit transfer. On this network we define a
ranking method based on a diffusion algorithm that mimics the spreading of
scientific credits on the network. We compare the results obtained with our
algorithm with those obtained by local measures such as the citation count and
provide a statistical analysis of the assignment of major career awards in the
area of Physics. A web site where the algorithm is made available to perform
customized rank analysis can be found at the address
http://www.physauthorsrank.orgComment: Revised version. 11 pages, 10 figures, 1 table. The portal to compute
the rankings of scientists is at http://www.physauthorsrank.or
Further analysis of LDEF FRECOPA micrometeoroid remnants
In the Al collectors of experiment A0138-1 of the French Cooperative Payload (FRECOPA) payload, we identified a population of small craters (3-9 microns in diameter) induced by the impacts of micron-sized grains, mainly of extraterrestrial origin. Chemical analyses of the Interplanetary Dust Particle (IDP) remnants were made in the bottoms and on the rims of the craters, in addition to immediate off-rim areas. So far, the compositional investigation of the craters by Energy Dispersive Spectroscopy (EDS) has shown evidence of an extraterrestrial origin for the impacting grains. The systematic presence of C and O in the residues has been reported and may be compared with the existence of particles showing high proportions of biogenic light elements and detected in the close environment of P-Halley comet nucleus (called CHON particles). An analytical protocol has been established in order to extract molecular and possible isotopic information on these grains, a fraction of which could be of cometary origin. Although these very small craters may show crater features that are typical of the larger Long Duration Exposure Facility (LDEF) population (greater than 50 microns), some show unique morphologies that we have not previously observed. Our initial Laser Induced Mass Spectrometry (LIMS) analytical results show strong signals for nitrogen-bearing ions in craters characterized by high C and O contents; they also suggest that carbon contents in some craters could exceed that known for carbonaceous chondrites
Food Sovereignty as a model for scholar-led open access publishing
As large commercial publishers adapt their business models to profit from an increasingly open access (OA) scholarly publishing landscape, there has been an increased focus on alternate scholar-led and diamond forms of open access. Andrea E. Pia and Filippo Zerilli, argue that to effectively compete and outcompete traditional publishers and bibliometrics, scholar-led publications can learn from the slow food and food sovereignty movements that have constructed co-operative systems for quality assessment that bypass the commercial mainstream
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