2,474 research outputs found
Low-lying 2 states generated by -quadrupole correlation and shell quenching
The quadrupole vibrational modes of neutron-rich =28 isotones (Ca,
Ar, S and Si) are investigated using the canonical-basis
time-dependent Hartree-Fock-Bogoliubov theory with several choice of energy
density functionals, including nuclear pairing correlation. It is found that
the quenching of =28 shell gap and the proton holes in the -shell
trigger quadrupole correlation and increase the collectivity of the low-lying
2 state in Ar. It is also found that the pairing correlation plays
an important role to increase the collectivity. We also demonstrate that the
same mechanism to enhance the low-lying collectivity applies to other =28
isotones S and Si, and it generates a couple of low-lying 2
states which can be associated with the observed states.Comment: 7 page and 4 figure
Pairing Effects in Nuclear Fusion Reaction
We simulate a heavy-ion collision using the canonical-basis time-dependent
Hartree-Fock-Bogoliubov theory (Cb-TDHFB) treating pairing correlation in the
three-dimensional coordinate space. We apply the Cb-TDHFB to 22O+22O collision
with a contact-type pairing energy functional, and compare results of Cb-TDHFB
and TDHF to investigate the effects of pairing correlations in nuclear fusion.
Our results seem to indicate that pairing effects do not increase the fusion
cross section in this system.Comment: 4 pges, 2 figures, Proceedings of the 12th Asia Pacific Physics
Conference(APPC12
Linear response calculation using the canonical-basis TDHFB with a schematic pairing functional
A canonical-basis formulation of the time-dependent Hartree-Fock-Bogoliubov
(TDHFB) theory is obtained with an approximation that the pair potential is
assumed to be diagonal in the time-dependent canonical basis. The
canonical-basis formulation significantly reduces the computational cost. We
apply the method to linear-response calculations for even-even nuclei. E1
strength distributions for proton-rich Mg isotopes are systematically
calculated. The calculation suggests strong Landau damping of giant dipole
resonance for drip-line nuclei.Comment: 6 pages, 1 figure, INPC 2010 conference proceding
Systematic study of low-lying E1 strength using the time-dependent mean field theory
We carry out systematic investigation of electric dipole (E1) mode from light
to heavy nuclei, using a new time-dependent mean field theory: the
Canonical-basis Time-Dependent Hartree-Fock-Bogoliubov (Cb-TDHFB) theory. The
Cb-TDHFB in the three-dimensional coordinate space representation can deal with
pairing correlation and any kind of deformation in the time-dependent
framework. We report the neutron-number dependence of the low-energy E1 mode
for light (A 100) around N = 82.Comment: 3 pages, 2 figures, The 11th International Symposium on Origin of
Matter and Evolution of Galaxies (OMEG11) proceeding
Thick-target yields of radioactive targets deduced from inverse kinematics
The thick-target yield (TTY) is a macroscopic quantity reflected by nuclear
reactions and matter properties of targets. In order to evaluate TTYs on
radioactive targets, we suggest a conversion method from inverse kinematics
corresponding to the reaction of radioactive beams on stable targets. The
method to deduce the TTY is theoretically derived from inverse kinematics. We
apply the method to the natCu(12C,X)24Na reaction to confirm availability. In
addition, it is applied to the 137Cs + 12C reaction as an example of a
radioactive system and discussed a conversion coefficient of a TTY measurement.Comment: 8 pages, 3 figures, Accepted to Nuclear Instruments and Methods in
Physics Research
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