17 research outputs found
Parameter Symmetry of the Interacting Boson Model
We discuss the symmetry of the parameter space of the interacting boson model
(IBM). It is shown that for any set of the IBM Hamiltonian parameters (with the
only exception of the U(5) dynamical symmetry limit) one can always find
another set that generates the equivalent spectrum. We discuss the origin of
the symmetry and its relevance for physical applications.Comment: Minor changes; Revtex, 14 pages with 1 figur
Calculations of reaction in chiral effective field theory
We present a calculation of the radiative capture cross section in the low-energy range, where the reaction channel dominates.
Employing the LENPIC nucleon-nucleon interaction up to the fifth order (N4LO)
that is regularized by the semi-local coordinate space regulators, we obtain
the initial and final state wave functions, and evaluate the phase shifts of
the scattering state and deuteron properties. We derive the transition operator
from the chiral effective field theory up to the next-to-next-to leading order
(N2LO), where we also regularize the transition operator using regulators
consistent with those of the interactions. We compute the capture cross
sections and the results show a converging pattern with the chiral-order
expansion of the nucleon-nucleon interaction, where the regulator dependence of
the results is weak when higher-order nucleon-nucleon interactions are
employed. We quantify the uncertainties of the cross-section results due to the
chiral-order truncation. The chirally complete and consistent cross-section
results are performed up to N2LO and they compare well with the experiments and
other theoretical predictions.Comment: 13 pages, 3 tables, 1 figur
Bremsstrahlung of 350--450 MeV protons as a tool to study interaction off-shell
The bremsstrahlung cross section is calculated within the
method of coordinate space representation. It is shown that in the beam energy
range of 350--450~MeV a deep attractive NN-potential with forbidden states
(Moscow potential) and realistic meson exchange potentials (MEP) give rise to
the cross sections that differ essentially in shape: the cross sections nearly
coincide in the minima but differ by a factor of 5 approximately in the maxima.
Therefore, the reaction at energies 350--450~Mev can be
used to study interaction off-shell and to discriminate experimentally
between MEP and Moscow potential.Comment: 5 pages, latex, 4 PS figures. Talk presented by Andrey Shirokov at
the International Conference on Quark Lepton Nuclear Physics ``QULEN97'', May
20-23, 1997, Osaka, Japan; to be published in Nucl. Phys.
--Dependence of Bond Energies in Double--- Hypernuclei
The -dependence of the bond energy of the
hypernuclear ground states is calculated in a three-body
model and in the Skyrme-Hartree-Fock approach.
Various and -nucleus or potentials
are used and the sensitivity of to the interactions
is discussed. It is shown that in medium and heavy
hypernuclei, is a linear function of
, where is rms radius of the hyperon orbital. It
looks unlikely that it will be possible to extract
interaction from the double- hypernuclear energies only, the
additional information about the -core interaction, in particular, on
is needed.Comment: 11 pages, LaTex, 3 figure
Pilot study of transcranial photobiomodulation of lymphatic clearance of beta-amyloid from the mouse brain: breakthrough strategies for non-pharmacologic therapy of Alzheimer's disease
In this pilot study, we analyzed effects of transcranial photobiomodulation (tPBM, 1267 nm, 32 J/cm2) on clearance of beta-amyloid (Aβ) from the mouse brain. The immunohistochemical and confocal data clearly demonstrate the significant reduction of deposition of Aβ plaques in mice after tPBM vs. untreated animals. The behavior tests showed that tPBM improved the cognitive, memory and neurological status of mice with Alzheimer’s disease (AD). Using of our original method based on optical coherence tomography (OCT) analysis of clearance of gold nanorods (GNRs) from the brain, we proposed possible mechanism underlying tPBM-stimulating effects on clearance of Aβ via the lymphatic system of the brain and the neck. These results open breakthrough strategies for a non-pharmacological therapy of Alzheimer’s disease and clearly demonstrate that tPBM might be a promising therapeutic target for preventing or delaying Alzheimer’s disease
Abstracts from the 20th International Symposium on Signal Transduction at the Blood-Brain Barriers
https://deepblue.lib.umich.edu/bitstream/2027.42/138963/1/12987_2017_Article_71.pd