613 research outputs found
Self-consistent calculations of quadrupole moments of the first 2+ states in Sn and Pb isotopes
A method of calculating static moments of excited states and transitions
between excited states is formulated for non-magic nuclei within the Green
function formalism. For these characteristics, it leads to a noticeable
difference from the standard QRPA approach. Quadrupole moments of the first 2+
states in Sn and Pb isotopes are calculated using the self-consistent TFFS
based on the Energy Density Functional by Fayans et al. with the set of
parameters DF3-a fixed previously. A reasonable agreement with available
experimental data is obtained.Comment: 5 pages, 6 figure
Reply to comment ``On the test of the modified BCS at finite temperature''
This is our formal Reply to revised version (v2) of arXiv: nucl-th/0510004v2.Comment: accepted in Physical Review
Test of modified BCS model at finite temperature
A recently suggested modified BCS (MBCS) model has been studied at finite
temperature. We show that this approach does not allow the existence of the
normal (non-superfluid) phase at any finite temperature. Other MBCS predictions
such as a negative pairing gap, pairing induced by heating in closed-shell
nuclei, and ``superfluid -- super-superfluid'' phase transition are discussed
also. The MBCS model is tested by comparing with exact solutions for the picket
fence model. Here, severe violation of the internal symmetry of the problem is
detected. The MBCS equations are found to be inconsistent. The limit of the
MBCS applicability has been determined to be far below the ``superfluid --
normal'' phase transition of the conventional FT-BCS, where the model performs
worse than the FT-BCS.Comment: 8 pages, 9 figures, to appear in PR
Neutrino absorption by hot nuclei in supernova environments
Using the thermal quasiparticle random phase approximation, we study the
process of neutrino and antineutrino capture on hot nuclei in supernova
environments. For the sample nuclei Fe and Ge we perform a
detailed analysis of thermal effects on the strength distribution of allowed
Gamow-Teller transitions which dominate low-energy charged-current neutrino
reactions. The finite temperature cross sections are calculated taking into
account the contributions of both allowed and forbidden transitions. The
enhancement of the low-energy cross sections is explained by considering
thermal effects on the GT strength. For Fe we compare the
calculated finite-temperature cross sections with those obtained from
large-scale shell-model calculations.Comment: Minor revisions according to referee's recomendation
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