@Article{Nagahiro_etal2012,
author="Nagahiro, H.
and Hirenzaki, S.
and Oset, E.
and Ramos, A.",
title="eta {\textquoteright}-Nucleus optical potential and possible eta {\textquoteright} bound states",
journal="Physics Letters B",
year="2012",
publisher="Elsevier Science Bv",
volume="709",
number="1-2",
pages="87--92",
abstract="Starting from a recent model of the eta{\textquoteright}N interaction, we evaluate the eta{\textquoteright}-nucleus optical potential, including the contribution of lowest order in density, t rho/2m(eta{\textquoteright}), together with the second-order terms accounting for eta{\textquoteright} absorption by two nucleons. We also calculate the formation cross section of the eta{\textquoteright} bound states from (pi(+), p) reactions on nuclei. The eta{\textquoteright}-nucleus potential suffers from uncertainties tied to the poorly known eta{\textquoteright}N interaction, which can be partially constrained by the experimental modulus of the eta{\textquoteright}N scattering length and/or the recently measured transparency ratios in eta{\textquoteright} nuclear photoproduction. Assuming an attractive interaction and taking the claimed experimental value vertical bar a(eta{\textquoteright}N)vertical bar = 0.1 fm, we obtain an eta{\textquoteright} optical potential in nuclear matter at saturation density of V eta{\textquoteright} = -(8.7 + 1.8i) MeV, not attractive enough to produce eta{\textquoteright} bound states in light nuclei. Larger values of the scattering length give rise to deeper optical potentials, with moderate enough imaginary parts. For a value vertical bar a(eta{\textquoteright}N)vertical bar = 0.3 fm, which can still be considered to lie within the uncertainties of the experimental constraints, the spectra of light and medium nuclei show clear structures associated to eta{\textquoteright}-nuclear bound states and to threshold enhancements in the unbound region.",
optnote="WOS:000302111200013",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=979), last updated on Tue, 08 May 2012 20:13:43 +0000",
issn="0370-2693",
doi="10.1016/j.physletb.2012.01.061",
opturl="http://arxiv.org/abs/1111.5706",
opturl="https://doi.org/10.1016/j.physletb.2012.01.061",
archivePrefix="arXiv",
eprint="1111.5706",
language="English"
}