1,869 research outputs found
Development of a Web-based software tool for predicting the occurrence and effect of air pollutants inside museum buildings
22-27 September 200
Description of two-electron atoms with correct cusp conditions
New sets of functions with arbitrary large finite cardinality are constructed
for two-electron atoms. Functions from these sets exactly satisfy the Kato's
cusp conditions. The new functions are special linear combinations of
Hylleraas- and/or Kinoshita-type terms. Standard variational calculation,
leading to matrix eigenvalue problem, can be carried out to calculate the
energies of the system. There is no need for optimization with constraints to
satisfy the cusp conditions. In the numerical examples the ground state energy
of the He atom is considered
Precise Coulomb wave functions for a wide range of complex l, eta and z
A new algorithm to calculate Coulomb wave functions with all of its arguments
complex is proposed. For that purpose, standard methods such as continued
fractions and power/asymptotic series are combined with direct integrations of
the Schrodinger equation in order to provide very stable calculations, even for
large values of |eta| or |Im(l)|. Moreover, a simple analytic continuation for
Re(z) < 0 is introduced, so that this zone of the complex z-plane does not pose
any problem. This code is particularly well suited for low-energy calculations
and the calculation of resonances with extremely small widths. Numerical
instabilities appear, however, when both |eta| and |Im(l)| are large and
|Re(l)| comparable or smaller than |Im(l)|
Neutron Removal from the Deformed Halo 31Ne Nucleus
Experimental data on Coulomb breakup and neutron removal indicate that 31Ne
is one of the heaviest halo nuclei discovered so far. The possible ground state
of 31Ne is either 3/2- coming from p-wave halo or 1/2+ from s-wave halo. In
this work, we develop a treatable model to include deformed wave functions and
a dynamical knockout formalism which includes the dependence on the nuclear
orientation to study the neutron removal from 31Ne projectiles at energies
around E=200 MeV/nucleon. A detailed account of the effects of deformation on
cross sections and longitudinal momentum distributions is made. Our numerical
analysis indicates a preference for the 31Ne ground state with spin parity
3/2-.Comment: 22 pages, 13 figures, accepted for publication in the Physical Review
Shadow poles in a coupled-channel problem calculated with Berggren basis
In coupled-channel models the poles of the scattering S-matrix are located on
different Riemann sheets. Physical observables are affected mainly by poles
closest to the physical region but sometimes shadow poles have considerable
effect, too. The purpose of this paper is to show that in coupled-channel
problem all poles of the S-matrix can be calculated with properly constructed
complex-energy basis. The Berggren basis is used for expanding the
coupled-channel solutions. The location of the poles of the S-matrix were
calculated and compared with an exactly solvable coupled-channel problem: the
one with the Cox potential. We show that with appropriately chosen Berggren
basis poles of the S-matrix including the shadow ones can be determined.Comment: 11 pages, 4 figures, 59 reference
Az élelmiszergazdaság külkereskedelme 2013. január-október
2013. január-október időszakában a mezőgazdasági és élelmiszeripari termékek kivitelének értéke 6694 millió eurót, behozatalának értéke 3764 millió eurót ért el. Az export értéke 55 millió euróval (-1 százalék) kevesebb, az import értéke 119 millió euróval (+3 százalék) magasabb volt, mint 2012. január-októberi időszakában. Az agár-külkereskedelem 2931 millió eurós aktívuma 173 millióval (-6 százalék) kevesebb, mint a bázisidőszakban
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