4,646 research outputs found
Comparative study of hyperon-nucleon interactions of quark model and chiral effective field theory by low-momentum equivalent interactions and matrices
Hyperon-nucleons interactions constructed by two frameworks, the
Kyoto-Niigata SU quark model and the chiral effective field theory, are
compared by investigating equivalent interactions in a low-momentum space and
in addition by calculating hyperon single-particle potentials in the
lowest-order Brueckner theory in symmetric nuclear matter. Two descriptions are
shown to give similar matrix elements in most channels after renormalizing high
momentum components. Although the range of the interaction is
different in two potentials, the single-particle potential in nuclear
matter is very similar. The -nucleus and -nucleus potentials are
also found to be similar. These predictions are to be confronted with
forthcoming experimental data.Comment: 8 pages, 7 figures. To appear in Phys. Rev.
He energies and radii by the coupled-cluster method with many-body average potential
The reformulated coupled-cluster method (CCM), in which average many-body
potentials are introduced, provides a useful framework to organize numerous
terms appearing in CCM equations, which enables us to clarify the structure of
the CCM theory and physical importance of various terms more easily. We
explicitly apply this framework to He, retaining one-body and two-body
correlations as the first illustrating attempt. Numerical results with using
two modern nucleon-nucleon interactions (AV18 and CD-Bonn) and their
low-momentum interactions are presented. The characters of short-range and
many-body correlations are discussed. Although not considered explicitly, the
expression of the ground-state energy in the presence of a three-nucleon force
is given.Comment: 12 pages, 11 figures, accepted for publication in PR
Analysis of (K^-,K^+) inclusive spectrum with semiclassical distorted wave model
The inclusive K^+ momentum spectrum in the 12C(K^-,K^+) reaction is
calculated by the semiclassical distorted wave (SCDW) model, including the
transition to the \Xi^- bound state. The calculated spectra with the strength
of the \Xi^--nucleus potential -50, -20, and +10 MeV are compared with the
experimental data measured at KEK with p_{K^-}=1.65 GeV/c. The shape of the
spectrum is reproduced by the calculation. Though the inclusive spectrum
changes systematically depending on the potential strength, it is not possible
to obtain a constraint on the potential from the present data. The calculated
spectrum is found to have strong emission-angle dependence. We also investigate
the incident K^- momentum dependence of the spectrum to see the effect of the
Fermi motion of the target nucleons which is explicitly treated in the SCDW
method.Comment: 7 pages, 5 figure
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