178 research outputs found
Structure properties of even-even actinides
Structure properties of fifty five even-even actinides have been calculated
using the Gogny D1S force and the Hartree-Fock-Bogoliubov approach as well as
the configuration mixing method. Theoretical results are compared with
experimental data.Comment: 5 pages, 5 figures, proceeding of FUSION0
Structure properties of Th and Fm fission fragments: mean field analysis with the Gogny force
The constrained Hartree-Fock-Bogoliubov method is used with the Gogny
interaction D1S to calculate potential energy surfaces of fissioning nuclei
Th and Fm up to very large deformations. The
constraints employed are the mass quadrupole and octupole moments. In this
subspace of collective coordinates, many scission configurations are identified
ranging from symmetric to highly asymmetric fragmentations. Corresponding
fragment properties at scission are derived yielding fragment deformations,
deformation energies, energy partitioning, neutron binding energies at
scission, neutron multiplicities, charge polarization and total fragment
kinetic energies.Comment: 15 pages, 23 figures, accepted for publication in Phys. Rev. C (2007
Structure of even-even nuclei using a mapped collective Hamiltonian and the D1S Gogny interaction
A systematic study of low energy nuclear structure at normal deformation is
carried out using the Hartree-Fock-Bogoliubov theory extended by the Generator
Coordinate Method and mapped onto a 5-dimensional collective quadrupole
Hamiltonian. Results obtained with the Gogny D1S interaction are presented from
dripline to dripline for even-even nuclei with proton numbers Z=10 to Z=110 and
neutron numbers N less than 200. The properties calculated for the ground
states are their charge radii, 2-particle separation energies, correlation
energies, and the intrinsic quadrupole shape parameters. For the excited
spectroscopy, the observables calculated are the excitation energies and
quadrupole as well as monopole transition matrix elements. We examine in this
work the yrast levels up to J=6, the lowest excited 0^+ states, and the two
next yrare 2^+ states. The theory is applicable to more than 90% of the nuclei
which have tabulated measurements. The data set of the calculated properties of
1712 even-even nuclei, including spectroscopic properties for 1693 of them, are
provided in CEA website and EPAPS repository with this article \cite{epaps}.Comment: 51 pages with 26 Figures and 4 internal tables; this version is
accepted by Physical Review
Microscopic and non-adiabatic Schr\"odinger equation derived from the Generator Coordinate Method based on 0 and 2 quasiparticle HFB states
A new approach called the Schr\"odinger Collective Intrinsic Model (SCIM) has
been developed to achieve a microscopic description of the coupling between
collective and intrinsic excitations. The derivation of the SCIM proceeds in
two steps. The first step is based on a generalization of the symmetric moment
expansion of the equations derived in the framework of the Generator Coordinate
Method (GCM), when both Hartree-Fock-Bogoliubov (HFB) states and
two-quasi-particle excitations are taken into account as basis states. The
second step consists in reducing the generalized Hill and Wheeler equation to a
simpler form to extract a Schr\"odinger-like equation. The validity of the
approach is discussed by means of results obtained for the overlap kernel
between HFB states and two-quasi-particle excitations at different
deformations.Comment: 27 pages, 12 figures, submitted to Phys. Rev.
Role of deformation on giant resonances within the QRPA approach and the Gogny force
Fully consistent axially-symmetric-deformed Quasi-particle Random Phase
Approximation (QRPA) calculations have been performed, in which the same Gogny
D1S effective force has been used for both the Hartree-Fock-Bogolyubov mean
field and the QRPA approaches. Giant resonances calculated in deformed
Si and Mg nuclei as well as in the spherical Si and
Mg isotopes are presented. Theoretical results for isovector-dipole and
isoscalar monopole, quadrupole, and octupole responses are presented and the
impact of the intrinsic nuclear deformation is discussed.Comment: 12 pages, 6 figures and 4 tables, accepted in PR
Magnetic Moment of the Fragmentation Aligned 61Fe(9/2)+ Isomer
We report on the g factor measurement of the isomer in (). The isomer was produced and spin-aligned via a projectile-fragmentation
reaction at intermediate energy, the Time Dependent Perturbed Angular
Distribution (TDPAD) method being used for the measurement of the g factor. For
the first time, due to significant improvements of the experimental technique,
an appreciable residual alignment of the isomer has been observed, allowing a
precise determination of its g factor: . Comparison of the
experimental g factor with shell-model and mean field calculations confirms the
spin and parity assignments and suggests the onset of deformation due
to the intrusion of Nilsson orbitals emerging from the .Comment: 4 figures. Submitted to Phys. Rev. Let
Evidence for Partial Occupancy of the 3s_1/2 Proton Orbital in 208-Pb
This research was sponsored by the National Science Foundation Grant NSF PHY 87-1440
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