28,229 research outputs found
Neutron-proton effective mass splitting in neutron-rich matter at normal density from analyzing nucleon-nucleus scattering data within an isospin dependent optical model
The neutron-proton effective -mass splitting in asymmetric nucleonic
matter of isospin asymmetry and normal density is found to be
from analyzing
globally 1088 sets of reaction and angular differential cross sections of
proton elastic scattering on 130 targets with beam energies from 0.783 MeV to
200 MeV, and 1161 sets of data of neutron elastic scattering on 104 targets
with beam energies from 0.05 MeV to 200 MeV within an isospin dependent
non-relativistic optical potential model. It sets a useful reference for
testing model predictions on the momentum dependence of the nucleon isovector
potential necessary for understanding novel structures and reactions of rare
isotopes.Comment: Published version, Physics Letters B743 (2015) 40
Spin-isospin Response in Finite Nuclei from an Extended Skyrme Interaction
The magnetic dipole (M1) and the Gamow-Teller (GT) excitations of finite
nuclei have been studied in a fully self-consistent Hartree-Fock (HF) plus
random phase approximation (RPA) approach by using a Skyrme energy density
functional with spin and spin-isospin densities. To this end, we adopt the
extended SLy5st interaction which includes spin-density dependent terms and
stabilize nuclear matter with respect to spin instabilities. The effect of the
spin-density dependent terms is examined in both the mean field and the
spin-flip excited state calculations. The numerical results show that those
terms give appreciable repulsive contributions to the M1 and GT response
functions of finite nuclei.Comment: 6 pages, 2 figure
Tunneling Qubit Operation on a Protected Josephson Junction Array
We discuss a protected quantum computation process based on a hexagon
Josephson junction array. Qubits are encoded in the punctured array, which is
topologically protected. The degeneracy is related to the number of holes. The
topological degeneracy is lightly shifted by tuning the flux through specific
hexagons. We also show how to perform single qubit operation and basic quantum
gate operations in this system.Comment: 8 pages, 4 figures. The published version in Phys. Rev.,
A81(2010)01232
Quantitative assessment of Earthās radiation belt modeling
The āQuantitative Assessment of Radiation Belt Modelingā focus group was in place at Geospace Environment Modeling from 2014 to 2018. The overarching goals of this focus group were to bring together the current stateāofātheāart models for the acceleration, transport, and loss processes in Earth's radiation belts; develop eventāspecific and global inputs of wave, plasma, and magnetic field to drive these models; and combine all these components to achieve a quantitative assessment of radiation belt modeling by validating against contemporary radiation belt measurements. This article briefly reviews the current understanding of radiation belt dynamics and related modeling efforts, summarizes the activities and accomplishments of the focus group, and discusses future directions.Accepted manuscrip
Quantitative assessment of radiation belt modeling
The āQuantitative Assessment of Radiation Belt Modelingā focus group was in place at Geospace Environment Modeling from 2014 to 2018. The overarching goals of this focus group were to bring together the current stateāofātheāart models for the acceleration, transport, and loss processes in Earth's radiation belts; develop eventāspecific and global inputs of wave, plasma, and magnetic field to drive these models; and combine all these components to achieve a quantitative assessment of radiation belt modeling by validating against contemporary radiation belt measurements. This article briefly reviews the current understanding of radiation belt dynamics and related modeling efforts, summarizes the activities and accomplishments of the focus group, and discusses future directions.Accepted manuscrip
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