1,308 research outputs found
Three-body structure of the system with coupling
The structure of the three-body system, which has been observed
recently by the HypHI collaboration, is investigated taking coupling explicitly into account. The and interactions employed in
this work reproduce the binding energies of H, H
and He. We do not find any bound state, which
contradicts the interpretation of the data reported by the HypHI collaboration.Comment: To be publsihed in PRC as a Rapid communicatio
Light hypernuclei in four-body cluster models
Detailed structure calculations in Be, H,
Li, H and Li are performed
within the framework of the microscopic two-, three- and four-body cluster
models using the Gaussian Expansion Method.Comment: 14 pages, 19 figures. To be published in Phys. Rev.
Four-body structure of Li and spin-dependent interaction
Two spin-doublet states of %- and - in
Li are studied on the basis of the
four-body model. We employ the two-body interactions which reproduce the
observed properties of any subsystems composed of ,
and , and . Furthermore, the
interaction is adjusted so as to reproduce the - splitting of in
H. The calculated energy splittings of - and
- states in Li are 0.69 MeV and 0.46 MeV, which are
in good agreement with the resent observed data. The spin-dependent components
of the interaction are discussed.Comment: 6 pages, 2 figures, published to be in Phys. Rev.
Tensor correlation, pairing interaction and deformation in Ne isotopes and Ne hypernuclei
We study tensor and pairing effects on the quadruple deformation of neon
isotopes based on a deformed Skyrme-Hartree-Fock model with BCS approximation
for the pairing channel. We extend the Skyrme-Hartree-Fock formalism for the
description of single- and double-lambda hypernuclei adopting two different
hyperon-nucleon interactions. It is found that the interplay of pairing and
tensor interactions is crucial to derive the deformations in several neon
isotopes. Especially, the shapes of Ne are studied in details in
comparisons with experimentally observed shapes. Furthermore the deformations
of the hypernuclei are compared with the corresponding neon isotopic cores in
the presence of tensor force. We find the same shapes with somewhat smaller
deformations for single -hypernuclei compared with their core
deformations. It is also pointed out that the latest version of hyperon
interaction, the ESC08b model, having a deeper potential makes
smaller deformations for hypernuclei than those of another NSC97f model.Comment: 13 pages, 5 figures, Physical Review C 2013 in pres
Cluster models of Lambda-Lambda-6He and Lambda-9Be hypernuclei
Configuration space Faddeev calculations are performed for the binding energy
of Lambda-Lambda-6He and Lambda-9Be bound states, here considered as
alpha-Lambda-Lambda and alpha-alpha-Lambda clusters respectively, in order to
study the dependence of the calculated binding energy on the alpha-Lambda
potential input. For Lambda-Lambda-6He, using realistic interactions, the
uncertainty in extracting the Lambda-Lambda S=L=0 interaction strength does not
exceed 0.1 MeV, which is a fraction of the order of magnitude derived for other
theoretical uncertainties. For Lambda-9Be, the dependence of the calculated
binding energy on the alpha-Lambda potential is considerably larger, of order 1
MeV. Our results for Lambda-9Be suggest that the odd-state alpha-Lambda
interaction is substantially reduced with respect to the even-state component.Comment: 16 pages, including 4 figures, typos corrected, slightly revised,
accepted to Nuclear Physics
-- coupling in He with the Nijmegen soft-core potentials
The -- coupling in
He is studied with the [ + +
] + [ + + ] + [ + + ] model,
where the particle is assumed as a frozen core. We use the Nijmegen
soft-core potentials, NSC97e and NSC97f, for the valence baryon-baryon part,
and the phenomenological potentials for the parts (=,
, and ). We find that the calculated of He for NSC97e and NSC97f are,
respectively, 0.6 and 0.4 MeV in the full coupled-channel calculation, the
results of which are about half in comparison with the experimental data,
MeV.
Characteristics of the sector in the NSC97 potentials are discussed in
detail.Comment: 18 pages, 4 figure
To bind or not to bind: Lambda-Lambda hypernuclei and Xi hyperons
Four-body Faddeev-Yakubovsky calculations for Lambda-Lambda-p-n do not
produce a bound state for Lambda-Lambda hydrogen 4, although suitably defined
three-body Faddeev calculations for Lambda-Lambda-d produce a 1+ bound state
for Lambda-Lambda interactions fitted to the Lambda-Lambda helium 6 emulsion
event from KEK E373. This is opposite to the normal situation where a four-body
Faddeev-Yakubovsky calculation yields stronger binding than that due to a
suitably defined three-body Faddeev calculation. For stranger systems, Faddeev
calculations using Lambda-Xi interactions which simulate the Nijmegen soft-core
model NSC97 (which is close to reproducing the KEK event) suggest that
Lambda-Xi helium 6 marks the onset of nuclear stability for Xi hyperons.Comment: Parallel-session invited talk at PANIC'02, to appear in NP
Strangeness -2 two-baryon systems
We derive strangeness -2 baryon-baryon interactions from a chiral constituent
quark model including the full set of scalar mesons. The model has been tuned
in the strangeness 0 and -1 two-baryon systems, providing parameter free
predictions for the strangeness -2 case. We calculate elastic and inelastic
and cross sections which are consistent with the
existing experimental data. We also calculate the two-body scattering lengths
for the different spin-isospin channels.Comment: 12 pages, 4 figures. Accepted for publication in Phys. Lett.
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