33,427 research outputs found
In-medium nuclear interactions of low-energy hadrons
Experimental and theoretical developments of the last decade in the study of
exotic atoms and some related low-energy reactions are reviewed, in order to
provide information on the in-medium hadron-nucleon t matrix over a wide range
of densities up to central nuclear densities. In particular, we review pionic
deeply bound atomic states and related evidence for partial restoration of
chiral symmetry in dense nuclear matter. The case for relatively narrow deeply
bound atomic states for antikaons and antiprotons is made, based on the physics
of strong nuclear absorption. Recent experimental suggestions for signals of
antikaon-nuclear deeply bound states are reviewed, and dynamical models for
calculating binding energies, widths and densities of antikaon nuclear states
are discussed. Specific features of low-energy in-medium interactions of kaons,
antiprotons and of Sigma hyperons are discussed, and suggestions to study
experimentally Cascade atoms are reviewed.Comment: 86 pages, 44 figures, slight revisions, references added, Physics
Reports (in press
Few-body calculations of -nuclear quasibound states
We report on precise hyperspherical-basis calculations of and quasibound states, using energy dependent interaction potentials
derived from coupled-channel models of the nucleon
resonance. The attraction generated in these models is too weak to
generate a two-body bound state. No bound-state solution was found in
our calculations in models where Re fm, with the scattering length, covering thereby the majority of
resonance models. A near-threshold bound-state
solution, with separation energy of less than 1 MeV and width of about
15 MeV, was obtained in the 2005 Green-Wycech model where Re fm. The role of handling self consistently the subthreshold
interaction is carefully studied.Comment: a second footnote added in v2, matching published versio
Future directions in kaonic atom physics
Recent progress and open problems in kaonic atom physics are presented. A
connection between phenomenological deep potentials and the underlying
interaction is established as well as the need for a theory for multinucleon
absorption of kaons. absorption at rest to specific
hypernuclei states is briefly discussed.Comment: 6 pages, 3 figures, proceedings of the EXA2011 conference, to appear
in Hyperfine Interaction
Antiprotonic Potentials from Global Fits to the PS209 Data
The experimental results for strong interaction effects in antiprotonic atoms
by the PS209 collaboration consist of high quality data for several sequences
of isotopes along the periodic table. Global analysis of these data in terms of
a -nucleus optical potential achieves good description of the data
using a s-wave finite-range \bar p N interaction. Equally good fits are also
obtained with a poorly-defined zero-range potential containing a p-wave term.Comment: 6 pages, 1 figure, talk at LEAP03, to appear in NIM(B
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