20,741 research outputs found
Helium nuclei around the neutron drip line
Neutron rich He nuclei have been investigated using relativistic mean field
approach in co-ordinate space. Elastic partial scattering cross sections for
proton scattering in inverse kinematics have been calculated using the
theoretically obtained density for He and compared with experiment. The
energies of the low-lying resonance states in the neutron unstable nuclei
He have also been calculated and compared with experimental
observations.Comment: To appear in Physical Review
Strain induced band gap deformation of H/F passivated graphene and h-BN sheet
Strain induced band gap deformations of hydrogenated/fluorinated graphene and
hexagonal BN sheet have been investigated using first principles density
functional calculations. Within harmonic approximation, the deformation is
found to be higher for hydrogenated systems than for the fluorinated systems.
Interestingly, our calculated band gap deformation for hydrogenated/fluorinated
graphene and BN sheets are positive, while those for pristine graphene and BN
sheet are found to be negative. This is due to the strong overlap between
nearest neighbor {\pi} orbitals in the pristine sheets, that is absent in the
passivated systems. We also estimate the intrinsic strength of these materials
under harmonic uniaxial strain, and find that the in-plane stiffness of
fluorinated and hydrogenated graphene are close, but larger in magnitude as
compared to those of fluorinated and hydrogenated BN sheet.Comment: Submitted to PR
Role of pairing interaction in neutron rich odd and even Zr nuclei
Neutron rich Zr nuclei with number of neutrons between = 50 and 82 are
investigated in the relativistic mean field approach in co-ordinate space. The
resonant levels in the positive energy continuum have been explicitly included
in the calculation. Odd nuclei have been treated in the blocking approximation.
Our calculation indicates that the dripline for odd mass isotopes is far away
from that for the even mass ones. Pairing interaction plays a significant role
in stabilizing the even isotopes, thus extending the dripline for them
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