3,071 research outputs found
Exotic atoms and exotic nuclei
We briefly review the study of the exotic atoms and exotic nuclei, and report
recent research activities of eta-mesic nucleus and kaonic atoms in this
article.Comment: 6 pages, 2 figures. Talk given at II Symposium on applied nuclear
physics and innovative technologies, Jagiellonian University, Krakow, Poland,
Acta Physica Polonica B (2015) in pres
Spatial and Temporal Diffusion of House Prices in the UK
This paper provides a method for the analysis of the spatial and temporal diffusion of shocks in a dynamic system. We use changes in real house prices within the UK economy at the level of regions to illustrate its use. Adjustment to shocks involves both a region specific and a spatial effect. Shocks to a dominant region - London - are propagated contemporaneously and spatially to other regions. They in turn impact on other regions with a delay. We allow for lagged effects to echo back to the dominant region. London in turn is influenced by international developments through its link to New York and other financial centers. It is shown that New York house prices have a direct effect on London house prices. We analyse the effect of shocks using generalised spatio-temporal impulse responses. These highlight the diffusion of shocks both over time (as with the conventional impulse responses) and over space.House Prices, Cross Sectional Dependence, Spatial Dependence
In--Flight () Reactions for the Formation of Kaonic Atoms and Kaonic Nuclei in Green function method
We study theoretically the kaonic atom and kaonic nucleus formations in the
in--flight () reactions using the Green function method, which is suited
to evaluate formation rates both of stable and unstable bound systems. We
consider C and O as the targets and calculate the spectra of the
() reactions. We conclude that a no peak structure due to kaonic nucleus
formation is expected in the reaction spectra calculated with the chiral
unitary kaon--nucleus optical potential. In the spectra with the
phenomenological deep kaon--nucleus potential, we may have possibilities to
observe some structures due to kaonic nucleus states. For all cases, we have
peaks due to the kaonic atom formations in the reaction spectra.Comment: 10 pages, 9 figures, newly calculated results added, revisions and
updated references, to appear in Physical Review
Formation of mesic nuclei
We study the structure and formation of the mesic nuclei to
investigate the in-medium modification of the -meson spectral function at
finite density. We consider (), () and ()
reactions to produce a -meson inside the nucleus and evaluate the effects
of its medium modifications to the reaction cross sections. We also estimate
the consequences of the uncertainties of the selfenergy in medium to
the -nucleus interaction. We find that it may be possible to see a peak
structure in the reaction spectra for the strong attractive potential cases. On
the other hand, for strong absorptive interaction cases with relatively weak
attractions, it is very difficult to observe clear peaks and we may need to
know the spectrum shape in a wide energy region to deduce the properties of
.Comment: 11 pages, 8 figure
Formation of Heavy Meson Bound States by Two Nucleon Pick-up Reactions
We develop a model to evaluate the formation rate of the heavy mesic nuclei
in the two nucleon pick-up reactions, and apply it to the Li target cases
for the formation of heavy meson- bound states, as examples. The
existence of the quasi-deuteron in the target nucleus is assumed in this model.
It is found that the mesic nuclei formation in the recoilless kinematics is
possible even for heavier mesons than nucleon in the two nucleon pick-up
reactions. We find the formation rate of the meson- bound states can be
around half of the elementary cross sections at the recoilless kinematics with
small distortions.Comment: 1 table, 10 figures, 8 page
Experimental status of deeply bound kaonic states in nuclei
We review recent claims of the existence of deeply bound kaonic states in
nuclei. Also we study in details the (K-,p) reaction on C12 with 1 GeV/c
momentum kaon beam, based on which a deep kaon nucleus optical potential was
claimed in [1]. In our Monte Carlo simulation of this reaction we include not
only the quasi-elastic K- p scattering, as in [1], but also K- absorption by
one and two nucleons followed by the decay of the hyperon in pi N, which can
also produce strength in the region of interest. The final state interactions
in terms of multiple scattering of the K-, p and all other primary particles on
their way out of the nucleus is also considered. We will show that all these
additional mechanisms allow us to explain the observed spectrum with a
"standard" shallow kaon nucleus optical potential obtained in chiral models.
[1] T. Kishimoto et al., Prog. Theor. Phys. 118, 181 (2007).Comment: 5 pages, 3 figures. To be published in the Proceedings of the
International Workshop on Chiral Symmetry in Hadrons and Nuclei (Chiral10),
Valencia, Spain, June 21-24, 201
Formation of Deeply Bound Kaonic Atoms in (K^-,N) Reactions
We study theoretically the (K^-,N) reactions for the formation of the deeply
bound kaonic atoms, which were predicted to be quasi--stable with narrow
widths, using the Green function method. We consider various cases with
different target nuclei and energies systematically and find the clear signals
in the theoretical spectra for all cases considered in this article. The
signals show very interesting structures, such as the instead
of the resonance peak. We discuss the origins of the interesting structures and
possibilities to get new information on the existence of the kaonic nuclei from
the spectra of the atomic state formations.Comment: 11 pages, 9 figure
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