21.
Non-nucleonic Effects Studied by Nuclear Moments
- Towner, I. S.
Measured magnetic moments of single-particle states in the Pb region differ
significantly from their Schmidt values. We discuss the reasons for this in
terms of meson-exchange currents, isobar currents, core polarisation and other
effects.
22.
Influence of nucleonic motion in Relativistic Fermi Gas inclusive
responses
- Alvarez-Ruso, L.; Barbaro, M. B.; Donnelly, T. W.; Molinari, A.
Impulsive hadronic descriptions of electroweak processes in nuclei involve
two distinctly different elements: one stems from the nuclear many-body physics
--- the medium --- which is rather similar for the various inclusive response
functions, and the other embodies the responses of the hadrons themselves to
the electroweak probe and varies with the channel selected. In this letter we
investigate within the context of the relativistic Fermi gas in both the
quasi-elastic and $N\to\Delta$ regimes the interplay between these two
elements. Specifically, we focus on expansions in the one small parameter in
the problem, namely, the momentum of a nucleon in the initial wave function
compared with the hadronic scale,...
23.
Collapse/Flattening of Nucleonic Bags in Ultra-Strong Magnetic Field
- Mandal, Soma; Chakrabarty, Somenath
It is shown explicitly using MIT bag model that in presence of ultra-strong
magnetic fields, a nucleon either flattens or collapses in the direction
transverse to the external magnetic field in the classical or quantum
mechanical picture respectively. Which gives rise to some kind of mechanical
instability. Alternatively, it is argued that the bag model of confinement may
not be applicable in this strange situation.
24.
Phase Transitions in Nucleonic Matter and Neutron-Star Cooling
- Khodel, V. A.; Clark, J. W.; Takano, M.; Zverev, M. V.
A new scenario for neutron-star cooling is proposed, based on the
correspondence between pion condensation, occurring in neutron matter due to
critical spin-isospin fluctuations, and the metal-insulator phase transition in
a two-dimensional electron gas. Beyond the threshold density for pion
condensation, where neutron-star matter loses its spatial homogeneity, the
neutron single-particle spectrum acquires an insulating gap that quenches
neutron contributions to neutrino-production reactions and to the star's
specific heat. In the liquid phase at densities below the transition point,
spin-isospin fluctuations are found to play dual roles. On the one hand, they
lead to a multi-sheeted neutron Fermi surface that extends to low momenta,
thereby activating the normally forbidden direct-Urca...
25.
Determination of heat-shield char-front recession with a nucleonic technique
- Davis, W. G.
Radionuclide method for determining Apollo heat shield char-front recession during reentry
26.
Nucleonic resonance excitations with linearly polarized photon in
$\gamma p\to \omega p$
- Zhao, Qiang
In this work, an improved quark model approach to the $\omega$ meson
photo-production with an effective Lagrangian is presented. The {\it t}-channel
{\it natural}-parity exchange is taken into account through the Pomeron
exchange, while the {\it unnatural}-parity exchange is described by the $\pi^0$
exchange. With a very limited number of parameters, the available experimental
data in the low energy regime can be consistently accounted for. We find that
the beam polarization observables show sensitivities to some {\it s}-channel
individual resonances in the $SU(6)\otimes O(3)$ quark model symmetry limit.
Especially, the two resonances $P_{13}(1720)$ and $F_{15}(1680)$, which belong
to the representation $[{\bf 56, ^2 8}, 2, 2, J]$, have dominant...
27.
Cumulative structure function in terms of nucleonic wave function of the
nucleus
- Braun, M. A.; Suslov, V. M.; Vlahovic, B.
The structure function of the nucleus in the cumulative region $x>1$ is
studied in terms of nucleon degrees of freedom. At high $Q^2$ the resulting
expressions are presented as a sum of contributions from few-nucleon
correlations. Two-nucleon correlations are studied in some detail. Spin
variables are averaged out. In the region $1
28.
A nucleonic NJL model for finite nuclei: dynamic mass generation and
ground-state observables
- Buervenich, T. J.; Madland, D. G.
We test the compatibility of chiral symmetry, dynamic mass generation of the
nucleon due to spontaneous breaking of chiral symmetry, and the description of
finite nuclear systems by employing an NJL model understood as a chiral
invariant effective theory for nucleons. We apply the model to nuclear matter
as well as to finite nuclei. In the latter case, the model is adjusted to
nuclear ground-state observables. We treat the case of a pure chiral theory and
the physically more realistic case where a portion of the nucleon mass (160
MeV) explicitly breaks chiral symmetry. The best version of this current model
is found to deliver reasonably good results...
29.
Compton Scattering off Nucleons: Focus on the Nucleonic Low-Energy
Degrees of Freedom
- Griesshammer, Harald W.
In this sketch, I focus on Physics and formalism behind dynamical
polarisabilities, a new tool to test and interpret quantitative predictions
about the low-energy degrees of freedom inside the nucleon from the multipoles
of Compton scattering for photon energies below 300 MeV. A way to extract them
from double-polarised precision experiments is sketched. Predictions from
Chiral Effective Field Theory, both on the proton and on the neutron, serve as
guideline for forthcoming experiments. Special interest is put on the r\^ole of
the nucleon spin-polarisabilities. For details and a complete list of
references, consult Refs. [1,2,3].
30.
The Role of Color Neutrality in Nuclear Physics--Modifications of
Nucleonic Wave Functions
- Frank, M. R.; Jennings, B. K.; Miller, G. A.
The influence of the nuclear medium upon the internal structure of a
composite nucleon is examined. The interaction with the medium is assumed to
depend on the relative distances between the quarks in the nucleon consistent
with the notion of color neutrality, and to be proportional to the nucleon
density. In the resulting description the nucleon in matter is a superposition
of the ground state (free nucleon) and radial excitations. The effects of the
nuclear medium on the electromagnetic and weak nucleon form factors, and the
nucleon structure function are computed using a light-front constituent quark
model. Further experimental consequences are examined by considering the
electromagnetic nuclear response functions....
31.
Consistent effective description of nucleonic resonances in an unitary
relativistic field-theoretic way
- Kleefeld, F.
High energy strong interaction physics is successfully described by the local
renormalizable gauge theory called Quantum-Chromo-Dynamics (QCD) with quarks
and gluons as ``elementary'' degrees of freedom, while intermediate energy
strong interaction physics shows up to be determined by a non-local,
non--renormalizable effective field theory (EFT) of ``effective'' degrees of
freedom like mesons, ground state baryons and resonances. Within the picture of
an effective field theory of strong interaction at intermediate energies I
present a ``toy-model'' in which fermionic and bosonic resonances are
considered to be ``particles'', i.e. they consistently are described by
(anti-)commuting effective field-operators (containing dynamics of infinitely
many quark-gluon or meson-nucleon diagrams) which are comfortably treated by
Wick's Theorem...
32.
Temporal variations of nucleonic abundances in solar flare energetic particle events. I - Well-connected events
- Mason, G. M.; Gloeckler, G.; Hovestadt, D.
33.
Consistent Effective Description Of Nucleonic Resonances In An Unitary Relativistic Field-Theoretic Way
- F. Kleefeld
High energy strong interaction physics is successfully described by the local renormalizable gauge theory called Quantum--Chromo--Dynamics (QCD) with quarks and gluons as "elementary" degrees of freedom, while intermediate energy strong interaction physics shows up to be determined by a non--local, non--renormalizable effective field theory (EFT) of "effective" degrees of freedom like mesons, ground state baryons and resonances. The connection between high and intermediate physics is established by a change of basis ("bosonisation") from the infinite Fock--state basis of quarks and gluons to the infinite Fock--state basis of the "effective" degrees of freedom. The infinite number of counter terms in the...
34.
Temporal variations of nucleonic abundances in solar flare energetic particle events. II - Evidence for large-scale shock acceleration
- Mason, G. M.; Gloeckler, G.; Hovestadt, D.
A survey of the roughly 1 MeV per nucleon ion abundance over the range H-Fe measured with 3 hr time resolution during large solar particle events from November 1973 through December 1977, under near solar minimum conditions, is presented. For all the monitored species, a strong decrease in average flux level occurred with increase of the optical flare site distance from the W 60 deg connection point. The 3 hr abundance ratios He/H, O/He, and Fe/He were observed to fluctuate by a factor of about two about their average values for given flare events, and the size of these fluctuations...
35.
Radioactive-type dual ablation measuring system, volume 1 Final report
- Bartley, J. D., Jr.
Nucleonic measurement of ablative heat shield material recession
36.
Charged-particle observations from OSO 3
- Badhwar, G. D.; Kaplon, M. F.; Valentine, D. A.
Primary cosmic ray nucleonic component observation by scintillator-Cerenkov telescope on OGO 3 satellite
37.
Zero-G flight test of a gauging system. Volume 2: System software
The nucleonic gauging system software for the computation of propellant mass is described.
38.
A program of proof tests of the dual ablation measurement technique Final report
Dual ablation measurement technique using nucleonic methods for tracing char and char virgin material interface recessions
39.
Analysis of gamma-ray energies for 56 excited superdeformed rotational bands of nuclei of lanthanons La to Dy and of Hg, Tl, and Pb on the basis of the two-revolving-cluster model, with evaluation of moments of inertia and radii of revolution and assignment of nucleonic compositions to the clusters and the central sphere.
- Pauling, L
Analysis of the gamma-ray energies of 28 excited superdeformed bands of lanthanon nuclei by application of the two-revolving-cluster model yields the result that the central sphere for all 28 has the semimagic-magic composition p40n50, with the range p8n12 to p14n18 for the clusters and the radius of revolution increasing from 7.31 to 7.76 fm. Similar analysis of 28 excited bands of Hg, Tl, and Pb nuclei leads to p56n82 (semimagic-magic) for the central sphere of 24 bands, p64n82 (semimagic-magic) for 2, and p64n90 (doubly semimagic) for 2, with cluster range p8n12 to p14n16 and values of the radius of revolution...
40.
Analysis of gamma-ray energies for 56 excited superdeformed rotational bands of nuclei of lanthanons La to Dy and of Hg, Tl, and Pb on the basis of the two-revolving-cluster model, with evaluation of moments of inertia and radii of revolution and assignment of nucleonic compositions to the clusters and the central sphere.
- Pauling, L
Analysis of the gamma-ray energies of 28 excited superdeformed bands of lanthanon nuclei by application of the two-revolving-cluster model yields the result that the central sphere for all 28 has the semimagic-magic composition p40n50, with the range p8n12 to p14n18 for the clusters and the radius of revolution increasing from 7.31 to 7.76 fm. Similar analysis of 28 excited bands of Hg, Tl, and Pb nuclei leads to p56n82 (semimagic-magic) for the central sphere of 24 bands, p64n82 (semimagic-magic) for 2, and p64n90 (doubly semimagic) for 2, with cluster range p8n12 to p14n16 and values of the radius of revolution...
