41.
Cryogenic quality meter.
- Kendall, P. E.
Nucleonic cryogenic quality meter design and development and fluid monitoring through hydrogen vent line on Saturn S-IVB stage under orbital conditions
42.
Mesons electromagnetic production study via a constituent quark approach
- Saghai, B.
Using a chiral constituent quark approach based on the broken SU(6) \otimes
O(3) symmetry, we focus on the spectroscopy of isospin-1/2 nucleonic
resonances. A model for the eta photoproduction, embodying all known nucleonic
resonances, shows clear need for a yet undiscovered S11 resonance, for which we
determine the mass (1.730 GeV) and the total width (180 MeV).
43.
Superconductivity with deformed Fermi surfaces and compact stars
- Sedrakian, Armen
I discuss the deformed Fermi surface superconductivity (DFS) and some of its
alternatives in the context of nucleonic superfluids and two flavor color
superconductors that may exist in the densest regions of compact stellar
objects.
44.
Analysis of the quadrupole deformation of $\Delta$(1232) within an
effective Lagrangian model for pion photoproduction from the nucleon
- Fernandez-Ramirez, C.; de Guerra, E. Moya; Udias, J. M.
We present an extraction of the E2/M1 ratio of the $\Delta$(1232) from
experimental data applying an effective Lagrangian model. We compare the result
obtained with different nucleonic models and we reconcile the experimental
results with the Lattice QCD calculations.
45.
Neutron stars and quark matter
- Baym, Gordon
Recent observations of neutron star masses close to the maximum predicted by
nucleonic equations of state begin to challenge our understanding of dense
matter in neutron stars, and constrain the possible presence of quark matter in
their deep interiors.
46.
Scaling of anisotropy flows in intermediate energy heavy ion collisions
- Ma, Y. G.; Yan, T. Z.; Cai, X. Z.; Chen, J. G.; Fang, D. Q.; Guo, W.; Liu, G. H.; Ma, C. W.; Ma, E. J.; Shen, W. Q.; Shi, Y.; Su, Q. M.; Tian, W. D.; Wang, H. W.; Wang, K.
Anisotropic flows ($v_1$, $v_2$ and $v_4$) of light nuclear clusters are
studied by a nucleonic transport model in intermediate energy heavy ion
collisions. The number-of-nucleon scalings of the directed flow ($v_1$) and
elliptic flow ($v_2$) are demonstrated for light nuclear clusters. Moreover,
the ratios of $v_4/v_2^2$ of nuclear clusters show a constant value of 1/2
regardless of the transverse momentum. The above phenomena can be understood by
the coalescence mechanism in nucleonic level and are worthy to be explored in
experiments.
47.
Atomic Nuclei with Tetrahedral and Octahedral Symmetries
- Dudek, J.; Gozdz, A.; Schunck, N.
We present possible manifestations of octahedral and tetrahedral symmetries
in nuclei. These symmetries are associated with the OhD and TdD double point
groups. Both of them have very characteristic finger-prints in terms of the
nucleonic level properties - unique in the Fermionic universe. The tetrahedral
symmetry leads to the four-fold degeneracies in the nucleonic spectra; it does
not preserve the parity. The octahedral symmetry leads to the four-fold
degeneracies in the nucleonic spectra as well but it does preserve the parity.
Microscopic predictions have been obtained using mean-field theory based on
the relativistic equations and confirmed by using 'traditional' Schroedinger
equation formalism. Calculations are performed in multidimensional deformation
spaces...
48.
Three-body electrodisintegration of the three-nucleon bound state with
${\Delta}$-isobar excitation: Processes below pion-production threshold
- Deltuva, A.; Yuan, L. P.; Adam Jr., J.; Sauer, P. U.
Electron scattering from the three-nucleon bound state with two- and
three-body disintegration is described. The description uses the purely
nucleonic charge-dependent CD-Bonn potential and its coupled-channel extension
CD-Bonn + $\Delta$.
Exact solutions of three-particle equations are employed for the initial and
final states of the reactions. The current has one-baryon and two-baryon
contributions and couples nucleonic with $\Delta$-isobar channels.
$\Delta$-isobar effects on the observables are isolated. The $\Delta$-isobar
excitation yields an effective three-nucleon force and effective two- and
three-nucleon currents beside other $\Delta$-isobar effects; they are mutually
consistent.
49.
Wigner Measures and Codimension Two Crossings
- Caroline Lasser
This paper gives a semiclassical description of nucleonic propagation through codimension
two crossings of electronic energy levels. Codimension two crossings are the simplest
energy level crossings, which aect the Born-Oppenheimer approximation in the zeroth
order term. The model we study is a two-level Schrodinger equation with a Laplacian
as kinetic operator and a matrix-valued linear potential, whose eigenvalues cross, if the
two nucleonic coordinates equal zero. We discuss the case of well-localized initial data
and obtain a description of the wavefunction's two-scaled Wigner measure and of the
weak limit of its position density, which is valid globally in time.
50.
The physical theory of one dimensional galactic cosmic-ray propagation in the atmosphere
- Obrien, K.
An analytical theory of atmospheric cosmic-ray propagation is developed based on a phenomenological model of hadron-nucleus collisions. This model correctly predicts the sea level cosmic-ray nucleon, pion and muon spectra, the cosmic-ray ionization profile in the atmosphere, and neutron flux and density profiles in the atmosphere. It is concluded that the large scale properties of atmospheric cosmic-rays can be accurately predicted on the basis of a nucleonic cascade with all secondaries mediated by pion production. Implications for energy independence of cross sections, the recent 70 GeV results from Serpukhov, and nucleonic relaxation rates in the atmosphere are discussed.
51.
Influence of the neutral sheet on the Swinson's type north-south anisotropy of cosmic rays
- Munakata, Y.; Shibata, S.; Hakamada, K.
The relations between the north-south anisotropy of cosmic rays and/or nucleonic intensity variation and the latitudinal angular distance (lambda) of the Earth from the neutral sheet is examined using the data in the period from Apr. 1976 to Aug. 1977 at the solar minimum. It is found that the nucleonic intensity variation of the cosmic rays has no correlation with sin lambda in this period as shown in a correlation diagram; but the amplitude of the north-south anisotropy is fairly correlated with sin lambda as shown in another diagram.
52.
Low-g propellant gaging
- Orton, George
A program to develop and demonstrate technology for low gravity propellant gaging on future geostationary satellites is described. Evaluations were performed to select four gaging concepts for ground tests and low gravity tests in the NASA KC-135 aircraft. The selected concepts were: (1) an ultrasonic point sensor system, (2) a nucleonic gaging system, (3) an ultrasonic torsional wave guide, and (4) an ultrasonic flowmeter. As a result of successful ground and KC-135 tests, two concepts (the ultrasonic point sensor and the nucleonic systems) were selected for orbital test in a shuttle Get-Away-Special experiment.
53.
Wigner Measures and Codimension Two Crossings
- Clotilde Fermanian Kammerer; Caroline Lasser
This paper gives a semiclassical description of nucleonic propagation through codimension two crossings of electronic energy levels. Codimension two crossings are the simplest energy level crossings, which aect the Born-Oppenheimer approximation in the zeroth order term. The model we study is a two-level Schrodinger equation with a Laplacian as kinetic operator and a matrix-valued linear potential, whose eigenvalues cross, if the two nucleonic coordinates equal zero. We discuss the case of well-localized initial data and obtain a description of the wavefunction's two-scaled Wigner measure and of the weak limit of its position density, which is valid globally in time.
54.
Inelastic Hadron Diffraction in High Energy Elastic Scattering of Nuclei
- Ma?ecki, A.; Goc-Jag?o, D.
The r\^{o}le of inelastic diffraction in elastic scattering of nuclei is
studied in the formalism of \emph{diffractive limit}. The results obtained for
scattering of the $\alpha$--particles on light nuclei show that the nucleonic
diffraction is especially important at large momentum transfers where the
Glauber model of geometric diffraction fails.
55.
Relativistic nuclear structure effects in (e,e' vec{p})
- Udias, J. M.; Vignote, Javier R.
Results for recoil nucleon induced polarization for $(e,e'\vec{p})$ are
presented using various approximations for the relativistic nucleonic current,
at the kinematics of a recent experiment at Bates. We see that the dynamical
relativistic effects improve the agreement with the data. We make predictions
for the induced normal polarization and responses for TJNAF 89-033 and Mainz
A1/2-93 experiments.
56.
Hadronic Transport Models
- Danielewicz, P.
Hadronic transport models may be utilized to extract bulk nuclear properties.
Deduction of in-medium nucleon-nucleon cross sections and of nuclear viscosity
is discussed, as well as the extraction of momentum dependence of nucleonic
mean field. Moreover, determination of the nuclear incompressibility and of
constraints on the nuclear pressure at supranormal densities is described.
57.
The Two-Nucleon System beyond the Pion Threshold
- Schwamb, M.; Arenhoevel, H.
A model is developed for the hadronic and electromagnetic interaction in the
two-nucleon system above pion threshold in the framework of meson, nucleon and
$\Delta$ degrees of freedom. It is based on time-ordered perturbation theory
and includes full meson retardation in potentials and exchange currents as well
as loop contributions to the nucleonic one-body current. Results for some
selected processes are discussed.
58.
Primordial Nucleosynthesis and Dark Matter
- Sarkar, Subir
The cosmological abundance of nucleons determined from considerations of Big
Bang nucleosynthesis allegedly provides compelling evidence for non-nucleonic
dark matter. Recent developments in measurements of primordial light element
abundances, in particular deuterium and helium, require reexamination of this
important issue. The present situation is uncertain but exciting.
59.
On the origin of TeV radiation of SN 1006
- Aharonian, F. A.; Atoyan, A. M.
We discuss the link between the nonthermal X-radiation and TeV gamma-ray
emission from SN 1006, and study the capabilities of both electronic and
nucleonic models for explanation of the TeV flux observed from the northeast
rim of SN 1006.
60.
Strangeness production via electromagnetic probes: 40 years later
- Saghai, Bijan
A brief review of the associated strangeness electromagnetic production is
presented. Very recent K+ Lambda photoproduction data on the proton from
threshold up to E=2.6 GeV are interpreted within a chiral constituent quark
formalism, which embodies all known nucleonic and hyperonic resonances. The
preliminary results of this work are reported here.
