63 research outputs found
Lambda Lambda-XiN Coupling Effects in Light Hypernuclei
The significance of -N coupling in double-
hypernuclei has been studied. The Pauli suppression effect due to this coupling
in He has been found to be 0.43 MeV for the coupling
strength of the NSC97e potential. This indicates that the free-space
interaction is stronger by about phase shift than
that deduced from the empirical data of He without
including the Pauli suppression effect. In He and
H, an attractive term arising from -N
conversion is enhanced by the formation of an alpha particle in intermediate
states. According to this enhancement, we have found that the
binding energy () of
He is about 0.27 MeV larger than that of
He for the NSC97e coupling strength. This finding deviates
from a general picture that the heavier is the core nucleus, the larger is
.Comment: 16 pages with 2 figure
Feasibility of extracting a admixture probability in the neutron-rich Li hypernucleus
We examine theoretically production of the neutron-rich Li
hypernucleus by a double-charge exchange (, ) reaction on a
B target with distorted-wave impulse approximation calculations. The
result shows that the magnitude and shape of the calculated spectrum at 1.20
GeV/c by a one-step mechanism via doorways
caused by a coupling can explain the
recent experimental data, and the admixture probability in
Li is found to be the order of 10 %. The (,
) reaction provides a capability of extracting properties of wave
functions with - coupling effects in neutron-rich nuclei,
together with the reaction mechanism.Comment: 13 pages, 3 figure
Full-Coupled Channel Approach to Doubly Strange -Shell Hypernuclei
We describe {\it ab initio} calculations of doubly strange, , -shell
hypernuclei (H, H,
He and He) as a first attempt to
explore the few-body problem of the {\it full}-coupled channel scheme for these
systems. The wave function includes , ,
and channels. Minnesota , D2 , and
simulated potentials based on the Nijmegen hard-core model, are used.
Bound state solutions of these systems are obtained. We find that a set of
phenomenological interactions among the octet baryons in and
-2 sectors, which is consistent with all of the available experimental binding
energies of and -2 -shell (hyper-)nuclei, can predict a particle
stable bound state of H.
For H and He,
and potentials enhance the net
coupling, and a large probability is obtained even for a weaker
potential.Comment: 4 pages, 1 figur
Stochastic Variational Search for H
A four-body calculation of the bound state, $^{\
4}_{\Lambda\Lambda}NN\Lambda N\Lambda\Lambda\Lambda\Lambda_\Lambda^3{H}+\Lambda\Lambda\LambdaB_{\Lambda\Lambda}(^{6}_{\Lambda\Lambda}{He})d\Lambda\Lambda$ model in the Letter.Comment: Corrected typos, added addtional calculations regarding a truncated
to l=0 interaction model, 4 pages, 3 figure
Intestinal Parasites among school children (7 to 12 years) in rural areas of Kudat District Sabah Malaysia
No abstrac
The - coupling effect in the neutron-rich -hypernucleus Li by microscopic shell model
We investigate the structure of the neutron-rich -hypernucleus
Li by using microscopic shell-model calculations considering a
- coupling effect. The calculated -mixing probability
in the Li ground state is found to be about 0.34 % which is
coherently enhanced by the - coupling configurations, leading
to the energy shift 0.28 MeV which is about 3 times larger than that in
Li. The importance of the configuration obtained by
the interaction and the potentiality of the neutron-rich environment
are discussed.Comment: 6 figure
Hyperonic mixing in five-baryon double-strangeness hypernuclei in a two-channel treatment
Properties of hypernuclei H and He are studied in a two-channel approach with explicit treatment of
coupling of channels ^3\text{Z}+\Lambda+\Lambda and \alpha+\Xi. Diagonal
\Lambda\Lambda and coupling \Lambda\Lambda-\Xi N interactions are derived
within G-matrix procedure from Nijmegen meson-exchange models. Bond energy
\Delta B_{\Lambda\Lambda} in He exceeds significantly
that in H due to the channel coupling. Diagonal \Xi\alpha
attraction amplifies the effect, which is sensitive also to \Lambda-core
interaction. The difference of the \Delta B_{\Lambda\Lambda} values can be an
unambiguous signature of the \Lambda\Lambda-\Xi N coupling in \Lambda\Lambda
hypernuclei. However, improved knowledge of the hyperon-nucleus potentials is
needed for quantitative extraction of the coupling strength from future data on
the \Lambda\Lambda hypernuclear binding energies.Comment: 11 pages with 3 figures; Phys. Rev. C, accepte
Progress Report Integrated Seed Sector Development Myanmar: 2019
This report can also be downloaded from : http://www.d-portal.org
- …