Nuclear Theory·nucl-th

Friday·June 19, 2020

6 papers—3 primary·3 cross-listed

01
[Submitted on 18 Jun 2020]
Microscopic Calculation of $Λ - α$ Folding Potential
Htun Htun Oo🇲🇲 · Hiroyuki Kamada🇯🇵
We construct a folding potential between the $α$ and $Λ$ particles based on underlying nucleon-nucleon and hyperon-nucleon interactions. Starting from a phenomenological $Λ$ -N potential and a Gaussian form of the $α$ -particle wave function we obtain for the built $α$ - $Λ$ interaction a bound $_{Λ}^{5}$ He state with the binding energy (3.10 MeV), which is consistent with recent experimental data $3.12 \pm 0.02$ MeV. When in turn an exact solution of the four-body Faddeev-Yakubovsky equation for the $α$ -particle calculated with the CDBonn, Nijmegen or Argonne V18 realistic nucleon-nucleon potential is used and the phenomenological Gaussian $Λ$ -N potential is replaced by the realistic (Nijmegen NSC97f) potential approximated by a rank-1 separable form, then $_{Λ}^{5}$ He is overbound. In particular, its binding energy given by the folding potential generated with the $α$ particle wave function based on the CDBonn potential is 7.47 MeV. Although the rank-1 separable $Λ$ -N potential reproduces the exact scattering length and the effective range of the original $Λ$ -N potential, the overbinding results from the lack of the required repulsive properties in the assumed separable form.
Comments:
13pages, 4 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2006.10392 [pdf]
Few Body Syst.(2022)·0 citations
02
[Submitted on 18 Jun 2020]
Spectral functions of strange vector mesons in asymmetric hyperonic matter
Amruta Mishra🇮🇳 · S. P. Misra🇮🇳
We study the medium modifications of the spectral functions as well as production cross-sections of the strange vector mesons ( $ϕ$ , $K^{*}$ and $K^{*} ˉ$ ) in isospin asymmetric strange hadronic matter. These are obtained from the in-medium masses of the open strange mesons and the decay widths $ϕ \to K K ˉ$ , $K^{*} \to K π$ and $K^{*} ˉ \to K ˉ π$ in the hadronic medium. The decay widths are computed using a field theoretic model of composite hadrons with quark/antiquark constituents, from the matrix element of the light quark-antiquark pair creation term of the free Dirac Hamiltonian between the initial and final states. The matrix element is multiplied with a coupling strength parameter for the light quark-antiquark pair creation, which is fitted to the observed vacuum decay width of the decay process. There are observed to be substantial modifications of the spectral functions as well as production cross-sections of these vector mesons due to isospin asymmetry as well as strangeness of the hadronic medum at high densities. These studies should have observable consequences, e.g. in the yield of the hidden and open strange mesons arising from the isospin asymmetric high energy heavy ion collisions at the Compressed baryonic matter (CBM) experiments at the future facility at GSI.
Comments:
34 pages, 9 figures, version published in Eur.Phys.Jour.A
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2006.10596 [pdf]
EPJA(2021)·7 citations
03
[Submitted on 18 Jun 2020]
Green's functions techniques for extended nuclear systems
A. Rios
I review the application of self-consistent Green's functions methods to study the properties of infinite nuclear systems. Improvements over the last decade, including the consistent treatment of three-nucleon forces and the development of extrapolation methods from finite to zero temperature, have allowed for realistic predictions of the equation of state of infinite symmetric, asymmetric and neutron matter based on chiral interactions. Microscopic properties, like momentum distributions or spectral functions, are also accessible. Using an indicative set of results based on a subset of chiral interactions, I summarise here the first-principles description of infinite nuclear system provided by Green's functions techniques, in the context of several issues of relevance for nuclear theory including, but not limited to, the role of short-range correlations in nuclear systems, nuclear phase transitions and the isospin dependence of nuclear observables.
Comments:
32 pages, 11 figures, submitted to Frontiers in Physics
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2006.10610 [pdf]
Front.in Phys.(2020)·39 citations

Affiliations

first authorsco-authorsvia INSPIRE

Microscopic Calculation of Λ−α Folding Potential

Spectral functions of strange vector mesons in asymmetric hyperonic matter

Green's functions techniques for extended nuclear systems

Affiliations

Microscopic Calculation of $Λ - α$ Folding Potential