9 research outputs found
Faddeev calculations for the A=5,6 Lambda-Lambda hypernuclei
Faddev calculations are reported for Lambda-Lambda-5H, Lambda-Lambda-5He and
Lambda-Lambda-6He in terms of two Lambda hyperons plus the respective nuclear
clusters, using Lambda-Lambda central potentials considered in past non-Faddeev
calculations of Lambda-Lambda-6He. The convergence with respect to the
partial-wave expansion is studied, and comparison is made with some of these
Lambda-Lambda hypernuclear calculations. The Lambda-Lambda Xi-N mixing
effect is briefly discussed.Comment: submitted for publicatio
A study of neutron-deuteron scattering in configuration space
A new computational method for solving the configuration-space Faddeev
equations for the breakup scattering problem has been applied to nd scattering
both below and above the two-body threshold.Comment: 4 pages, 3 Postscript figures, uses espcrc1.sty Talk at the 18th
International IUPAP Conference on Few-Body Problems in Physics, Aug. 21-26,
2006, Santos, Brazi
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
Light Lambda-Lambda Hypernuclei and the Onset of Stability for Lambda-Xi Hypernuclei
New Faddeev-Yakubovsky calculations for light Lambda-Lambda hypernuclei are
presented in order to assess the self consistency of the Lambda-Lambda
hypernuclear binding-energy world data and the implied strength of the
Lambda-Lambda interaction, in the wake of recent experimental reports on
Lambda-Lambda-4H and Lambda-Lambda-6He. Using Gaussian soft-core simulations of
Nijmegen one-boson-exchange model interactions, the Nijmegen soft-core model
NSC97 simulations are found close to reproducing the recently reported binding
energy of Lambda-Lambda-6He, but not those of other species. For stranger
systems, Faddeev calculations of light Lambda-Xi hypernuclei, using a
simulation of the strongly attractive Lambda-Xi interactions due to the same
model, suggest that Lambda-Xi-6He marks the onset of nuclear stability for Xi
hyperons.Comment: 5 pages, 3 postscript figures; fig.2 replaced, minor changes,
accepted as Rapid Communication in PR
Resonant State in Helium-4 Lambda
In a recent experiment E906 at the BNL-AGS, a search for light S=-2
hypernuclei, strong evidence was found for the nuclide Hydrogen-4 double
Lambda. One of the most striking components of this data was the appearance of
a narrow low-momentum pi- line at k(pi-) = 104-105 MeV/c. This was ascribed to
the decay of Hydrogen-4 double Lambda into a resonant state in Helium-4 Lambda.
The existence of such a state is shown to be plausible and its characteristics
are delineated.Comment: 4 pages, 1 figur
Effect of tensor couplings in a relativistic Hartree approach for finite nuclei
The relativistic Hartree approach describing the bound states of both
nucleons and anti-nucleons in finite nuclei has been extended to include tensor
couplings for the - and -meson. After readjusting the parameters
of the model to the properties of spherical nuclei, the effect of
tensor-coupling terms rises the spin-orbit force by a factor of 2, while a
large effective nucleon mass sustains. The overall
nucleon spectra of shell-model states are improved evidently. The predicted
anti-nucleon spectra in the vacuum are deepened about 20 -- 30 MeV.Comment: 31 pages, 4 postscript figures include
Four-body cluster structure of double- hypernuclei
Energy levels of the double- hypernuclei
He, Li,
Li, Li,
Be and Be are predicted on
the basis of the four-body model with He and , respectively.Comment: 27 pages (preprint style), 12figures submitted to Phys. Rev.