nucl-th digest · Sep 9, 2019

[Submitted on 6 Sept 2019]

Implications of an increased $Λ$ -separation energy of the hypertriton

Hoai Le🇩🇪 · Johann Haidenbauer🇩🇪 · Ulf-G. Meißner🇩🇪 · Andreas Nogga🇩🇪

Stimulated by recent indications that the binding energy of the hypertriton could be significantly larger than so far assumed, requirements of a more strongly bound $_{Λ}^{3} H$ state for the hyperon-nucleon interaction and consequences for the binding energies of $A = 4, 5$ and $7$ hypernuclei are investigated. As basis a $Y N$ potential derived at next-to-leading order in chiral effective field theory is employed, Faddeev and Yakubovsky equations are solved to obtain the corresponding $3$ - and $4$ -body binding energies, respectively, and the Jacobi no-core shell model is used for $_{Λ}^{5}$ He and $_{Λ}^{7}$ Li. It is found that the spin-singlet $Λ p$ interaction would have to be much more attractive which can be, however, accommodated within the bounds set by the available $Λ p$ scattering data. The binding energies of the $_{Λ}^{4} He$ hypernucleus are predicted to be closer to the empirical values than for $Y N$ interactions that produce a more weakly bound $_{Λ}^{3} H$ . The quality of the description of the separation energy and excitation spectrum for $_{Λ}^{7}$ Li remains essentially unchanged.

Comments:: 8 pages, 3 figures; version that was published in Phys. Lett. B
Subjects:: Nuclear Theory (nucl-th)
arXiv:: 1909.02882 [pdf]

PLB(2020)·39 citations

Analysis of quasielastic

(e, e^{'})

electromagnetic responses and scaling for nuclear matter in the relativistic mean field model

A detailed study of the electromagnetic responses for quasielastic

(e, e^{'})

reactions from nuclear matter is presented within the framework of a relativistic model including momentum dependent scalar and vector mean field potentials in both the initial and final nucleon wave function states. The effects ascribed to the use of energy-dependent potentials are carefully analyzed by comparing their predictions with the responses obtained in the case of constant, i.e., energy-independent, potentials, as well as with the plane wave limit in the final state. The study is extended to the scaling phenomenon. Results are provided for the scaling functions corresponding to different nuclear systems evaluated at several kinematics ranging from intermediate to high values of the transfer momentum. Emphasis is placed on scaling of the first and second kinds and the role played by the relativistic scalar and vector mean field potentials.

Comments:: 21 pages, 8 figures. Submitted to Nucl. Phys. A
Subjects:: Nuclear Theory (nucl-th)
arXiv:: 1909.02906 [pdf]

NPA(2020)·1 citation

Monday·September 9, 2019

Implications of an increased $Λ$ -separation energy of the hypertriton

Analysis of quasielastic $(e, e^{'})$ electromagnetic responses and scaling for nuclear matter in the relativistic mean field model

Affiliations

Implications of an increased Λ-separation energy of the hypertriton

Analysis of quasielastic (e,e′) electromagnetic responses and scaling for nuclear matter in the relativistic mean field model

Affiliations

Implications of an increased $Λ$ -separation energy of the hypertriton

Analysis of quasielastic $(e, e^{'})$ electromagnetic responses and scaling for nuclear matter in the relativistic mean field model