4,614 research outputs found
The Urban Crimnal Justice System: A Case of Fairness
This short essay contains the presiding judges recollections of the case People v. Robles as a way to discuss public perception of fairness in the criminal justice system
Not an Excessive Claim, Nor a Divisive One, But a Traditional One: A Response To Lawrence Welch on Immediate Material Cooperation
Electron impact excitation rates for transitions in Mg V
Energy levels, radiative rates (A-values) and lifetimes, calculated with the
GRASP code, are reported for an astrophysically important O-like ion Mg~V.
Results are presented for transitions among the lowest 86 levels belonging to
the 2s2p, 2s2p, 2p, and 2s2p3 configurations.
There is satisfactory agreement with earlier data for most levels/transitions,
but scope remains for improvement. Collision strengths are also calculated,
with the DARC code, and the results obtained are comparable for most
transitions (at energies above thresholds) with earlier work using the DW code.
In thresholds region, resonances have been resolved in a fine energy mesh to
determine values of effective collision strengths () as accurately as
possible. Results are reported for all transitions at temperatures up to
10~K, which should be sufficient for most astrophysical applications.
However, a comparison with earlier data reveals discrepancies of up to two
orders of magnitude for over 60\% of transitions, at all temperatures. The
reasons for these discrepancies are discussed in detail.Comment: 11p of Text, 6 Tables and 6 Figures will appear in Canadian J.
Physics (2017
Radiative rates for E1, E2, M1, and M2 transitions in S-like to F-like tungsten ions (W LIX to W LXVI)
Calculations of energy levels, radiative rates and lifetimes are reported for
eight ions of tungsten, i.e. S-like (W LIX) to F-like (W LXVI). A large number
of levels has been considered for each ion and extensive configuration
interaction has been included among a range of configurations. For the
calculations, the general-purpose relativistic atomic structure package (GRASP)
has been adopted, and radiative rates (as well as oscillator strengths and line
strengths) are listed for all E1, E2, M1, and M2 transitions of the ions.
Comparisons have been made with earlier available experimental and theoretical
energies, although these are limited to only a few levels for most ions.
Therefore for additional accuracy assessments, particularly for energy levels,
analogous calculations have been performed with the flexible atomic code (FAC).Comment: 12 pages of Text + Tables A to Q and 1 to 16, will appear in ADNDT
(2016
Comment on "Multiconfiguration Dirac-Fock energy levels and radiative rates for Br-like tungsten" by S. Aggarwal, A.K.S. Jha, and M. Mohan [Can . J. Phys. 91 (2013) 394]
We report calculations of energy levels and oscillator strengths for
transitions in W XL, undertaken with the general-purpose relativistic atomic
structure package ({\sc grasp}) and flexible atomic code ({\sc fac}).
Comparisons are made with existing results and the accuracy of the data is
assessed. Discrepancies with the most recent results of S. Aggarwal et al.
[Can. J. Phys. {\bf 91} (2013) 394] are up to 0.4 Ryd and up to two orders of
magnitude for energy levels and oscillator strengths, respectively.
Discrepancies for lifetimes are even larger, up to four orders of magnitude for
some levels. Our energy levels are estimated to be accurate to better than 0.5%
(i.e. 0.2 Ryd), whereas results for oscillator strengths and lifetimes should
be accurate to better than 20%.Comment: Text 7p, Tables 4, will appear in Canadian Journal of Physics (2013
Radiative rates for E1, E2, M1, and M2 transitions in Br-like ions with 43 Z 50
Energies and lifetimes are reported for the eight Br-like ions with 43
Z 50, namely Tc ~IX, Ru~X, Rh~XI, Pd~XII, Ag~XIII, Cd~XIV, In~XV, and
Sn~XVI. Results are listed for the lowest 375 levels, which mostly belong to
the 4s4p, 4s4p4, 4s4p, 4s4p5,
4s4p4d, 4s4p4, and 4s4p5 configurations.
Extensive configuration interaction among 39 configurations (generating 3990
levels) has been considered and the general-purpose relativistic atomic
structure package ({\sc grasp}) has been adopted for the calculations.
Radiative rates are listed for all E1, E2, M1, and M2 transitions involving the
lowest 375 levels. Previous experimental and theoretical energies are available
for only a few levels of three, namely Ru~X, Rh~XI and Pd~XII. Differences with
the measured energies are up to 4\% but the present results are an improvement
(by up to 0.3 Ryd) in comparison to other recently reported theoretical data.
Similarly for radiative rates and lifetimes, prior results are limited to those
involving only 31 levels of the 4s4p, 4s4p4d, and
4s4pconfigurations for the last four ions. Moreover, there are generally no
discrepancies with our results, although the larger calculations reported here
differ by up to two orders of magnitude for a few transitions.Comment: Complete Tables 1-16 will soon appear in ADNDT. arXiv admin note:
substantial text overlap with arXiv:1504.0033
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