64 research outputs found
Calculations of kaonic nuclei based on chiral meson-baryon coupled channel interaction models
We present our latest calculations of -nuclear quasi-bound states using
a self-consistent scheme for constructing -nuclear potentials from various
subthreshold chirally inspired scattering amplitudes. We consider
in-medium versions of the scattering amplitudes taking into account Pauli
blocking in the intermediate states. The resulting binding energies as
well as the widths exhibit the same A dependence, however, the binding energies
strongly depend on the model used.Comment: 4 pages, proceedings of the MESON 2016 conference, Krakow, Poland,
June 2 - 7, 201
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
Lambda-hypernuclear production in stopped (K-,pion) reactions reexamined
DWIA calculations of Lambda-hypernuclear production rates in stopped K-
reactions on several p-shell targets used recently in experiments by the FINUDA
Collaboration are reported. Chirally motivated K- + N -> pion + Lambda
in-medium transition amplitudes are employed and the sensitivity of the
calculated rates to the initial K- atomic wavefunctions and final pion
distorted waves is studied. The calculated rates are compared with measured
rates, wherever available, confirming earlier observations that (i) the
calculated rates are generally lower than the measured rates, and (ii) the
deeper the K- nuclear potential, the worse is the discrepancy. The A dependence
of the calculated 1s Lambda hypernuclear production rates is discussed for the
first time, providing a useful tool in resolving the issue of depth of the K-
nuclear potential near threshold.Comment: matches published version, including the dubious change of
`revisited' in the title to `reexamined' upon PRC Editor's insistenc
Chirally motivated K^- nuclear potentials
In-medium subthreshold KbarN scattering amplitudes calculated within a
chirally motivated meson-baryon coupled-channel model are used self
consistently to confront K^- atom data across the periodic table. Substantially
deeper K^- nuclear potentials are obtained compared to the shallow potentials
derived in some approaches from threshold amplitudes, with Re V_{chiral} =
-(85+/-5) MeV at nuclear matter density. When KbarNN contributions are
incorporated phenomenologically, a very deep K^- nuclear potential results, Re
V_{chiral+phen.} = -(180+/-5) MeV, in agreement with density dependent
potentials obtained in purely phenomenological fits to the data. Self
consistent dynamical calculations of K^- nuclear quasibound states are reported
and discussed.Comment: extended discussion, unchanged results and conclusions, accepted by
PL
Chirally motivated amplitudes for in-medium applications
A new fit of a chirally motivated coupled-channels model for meson-baryon
interactions is presented including the recent SIDDHARTA data on the 1s level
characteristics of kaonic hydrogen. The kaon-nucleon amplitudes generated by
the model are fully consistent with our earlier studies. We argue that a sharp
increase of the real part of the in-medium amplitude at subthreshold
energies provides a link between the shallow -nuclear optical
potentials obtained microscopically from threshold interactions and
the phenomenological deep ones deduced from kaonic atoms data. The impact on
the -dependence of the -hypernuclear formation rates measured in
reactions with stopped kaons is discussed too.Comment: 18 pages, updated to match the version accepted for publication in a
special issue of Nuclear Physics A on Strangeness Nuclear Physic
Antikaon-nucleus dynamics: from quasibound states to kaon condensation
Coupled-channel Kbar-N dynamics near threshold and its repercussions in
few-body Kbar-nuclear systems are briefly reviewed, highlighting studies of a
K^-pp quasibound state. In heavier nuclei, the extension of mean-field
calculations to multi-Kbar nuclear and hypernuclear quasibound states is
discussed. It is concluded that strangeness in finite self-bound systems is
realized through hyperons, with no room for kaon condensation.Comment: Proceedings version of plenary talk at Quark Nuclear Physics (QNP09)
September 2009, Beijing; matches published versio
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