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    ABSTRACT: We report on precise hyperspherical-basis calculations of $\eta NN$ and $\eta NNN$ quasibound states, using energy dependent $\eta N$ interaction potentials derived from coupled-channel models of the $S_{11}$ $N^{\ast}(1535)$ nucleon resonance. The $\eta N$ attraction generated in these models is too weak to generate a two-body bound state. No $\eta NN$ bound-state solution was found in our calculations in models where Re $a_{\eta N}\lesssim 1$ fm, with $a_{\eta N}$ the $\eta N$ scattering length, covering thereby the majority of $N^{\ast}(1535)$ resonance models. A near-threshold $\eta NNN$ bound-state solution, with $\eta$ separation energy of less than 1 MeV and width of about 15 MeV, was obtained in the 2005 Green-Wycech model where Re $a_{\eta N}\approx 1$ fm. The role of handling self consistently the subthreshold $\eta N$ interaction is carefully studied.
    Physics Letters B 05/2015; 747. DOI:10.1016/j.physletb.2015.06.010
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    ABSTRACT: The large charge symmetry breaking (CSB) implied by the $\Lambda$ binding energy difference $\Delta B^{4}_{\Lambda}(0^+_{\rm g.s.})\equiv B_{\Lambda}(_{\Lambda}^4$He)$-$$B_{\Lambda}(_{\Lambda}^4$H) = 0.35$\pm$0.06 MeV of the $A=4$ mirror hypernuclei ground states, determined from emulsion studies, has defied theoretical attempts to reproduce it in terms of CSB in hyperon masses and in hyperon-nucleon interactions, including one pion exchange arising from $\Lambda-\Sigma^0$ mixing. Using a schematic strong-interaction $\Lambda N\leftrightarrow\Sigma N$ coupling model developed by Akaishi and collaborators for $s$-shell $\Lambda$ hypernuclei, we revisit the evaluation of CSB in the $A=4$ $\Lambda$ hypernuclei and extend it to $p$-shell mirror $\Lambda$ hypernuclei. The model yields values of $\Delta B^{4}_{\Lambda} (0^+_{\rm g.s.})\sim 0.25$ MeV. Smaller size and mostly negative $p$-shell binding energy differences are calculated for the $A=7-10$ mirror hypernuclei, in rough agreement with the few available data. CSB is found to reduce by almost 30 keV the 110 keV $_{~\Lambda}^{10}$B g.s. doublet splitting anticipated from the hyperon-nucleon strong-interaction spin dependence, thereby explaining the persistent experimental failure to observe the $2^-_{\rm exc}\to 1^-_{\rm g.s.}$ $\gamma$-ray transition.
    Physics Letters B 03/2015; 744. DOI:10.1016/j.physletb.2015.04.009
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    ABSTRACT: The ongoing debate of whether the aging process is driven by stochastic events or regulated by biological mechanisms is nearly a century old. While numerous studies strongly support the idea that signaling and metabolic pathways govern the pace of aging, other findings suggest that a sequence of stochastic events underlies the progression of this process. Two recent developments in the field of aging provide affirmation to the notion that aging has regulated aspects. First, the collapse of proteome integrity (proteostasis), a prominent aspect of aging, occurs within a surprisingly narrow time window, shortly after transition of the nematode Caenorhabditis elegans to adulthood. In addition, inter-tissue communication was found to play key roles in proteostasis maintenance across tissues and to affect the worm's lifespan. Here we briefly review the current knowledge in the field and delineate the experimental evidence which indicates that aging is a complex, multi-factorial process whose pace is determined by both random events and regulatory mechanisms.
    Frontiers in Genetics 03/2015; 6:80. DOI:10.3389/fgene.2015.00080


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    Jerusalem, Israel
  • Head of Institution
    Amir Steinman
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Top publications last week by reads

Journal of Materials Chemistry 03/2006; 16(11). DOI:10.1039/b512706h
889 Reads
Applied Linguistics 03/1984; 5(3). DOI:10.1093/applin/5.3.196
117 Reads

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