689 research outputs found
Hartree-Fock-Bogoliubov solution of the pairing Hamiltonian in finite nuclei
We present an overview of the Hartree-Fock-Bogoliubov (HFB) theory of
nucleonic superfluidity for finite nuclei. After introducing basic concepts
related to pairing correlations, we show how the correlated pairs are
incorporated into the HFB wave function. Thereafter, we present derivation and
structure of the HFB equations within the superfluid nuclear density functional
formalism and discuss several aspects of the theory, including the unitarity of
the Bogoliubov transformation in truncated single-particle and quasiparticle
spaces, form of the pairing functional, structure of the HFB continuum,
regularization and renormalization of pairing fields, and treatment of pairing
in systems with odd particle numbers.Comment: Contributed chapter in "50 Years of Nuclear BCS", edited by R. A.
Broglia and V. Zelevinsky, references correcte
On the origin of nuclear clustering
Clustering is one of the most complex phenomena known to the structure of
atomic nuclei. A comprehensive description of this ubiquitous phenomenon goes
beyond standard shell model and cluster model frameworks. We argue that
clustering is a consequence of an openness of the nuclear many-body system. To
illustrate this point, we study the near-threshold behavior of exceptional
points in ^16 Ne and ^24 S.Comment: Proceedings "Frontier Issues in Physics of Exotic Nuclei"
(YKIS2011/DCEN2011), 14 pages, 9 figure
Near-threshold correlations of neutrons
The appearance of charged-particle clustering in near-threshold configuration
is a phenomenon that can be explained in the Open Quantum System description of
the atomic nucleus. In this work we apply the realistic Shell Model Embedded in
the Continuum to elucidate the emergence of neutron correlations in
near-threshold many-body states coupled to l=1,2 neutron decay channels.
Spectral consequences of such continuum coupling are briefly discussed together
with the emergence of complex multi-neutron correlations.Comment: Invited talk at XXXIII Mazurian Lakes Conference on Physic
Microscopic Description of Nuclear Fission: Fission Barrier Heights of Even-Even Actinides
We evaluate the performance of modern nuclear energy density functionals for
predicting inner and outer fission barrier heights and energies of fission
isomers of even-even actinides. For isomer energies and outer barrier heights,
we find that the self-consistent theory at the HFB level is capable of
providing quantitative agreement with empirical data.Comment: 8 pages, 6 figures, 1 table; Proceedings of the 5th International
Conference on "Fission and properties of neutron-rich nuclei" (ICFN5),
Sanibel Island, Nov. 4-10, 201
Additivity of Quadrupole Moments in Superdeformed Bands: Single-Particle Motion at Extreme Conditions
Quadrupole and hexadecapole moments of superdeformed bands in the
150 mass region have been analyzed in the cranking Skyrme-Hartree-Fock
model. It is demonstrated that, independently of the intrinsic configuration
and of the proton and neutron numbers, the charge moments calculated with
respect to the doubly-magic superdeformed core of Dy can be expressed
very precisely in terms of independent contributions from the individual hole
and particle orbitals. This result, together with earlier studies of the
moments of inertia distributions, suggests that many features of the
superdeformed bands in the 150 mass region can be very well understood
in terms of an almost undisturbed single-particle motion.Comment: 10 RevTeX pages, 1 uuencoded POSTSCRIPT figure include
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