K− nuclear states: Binding energies and widths

Abstract

K − optical potentials relevant to calculations of K − nuclear quasi-bound states were developed within several chiral meson-baryon coupled-channel interaction models. The applied models yield quite different K − binding energies and widths. Then, the K − multinucleon interactions were incorporated by a phenomenological optical potential fitted recently to kaonic atom data. Though the applied K − interaction models differ significantly in the K − N subthreshold region, our selfconsistent calculations of kaonic nuclei across the periodic table lead to conclusions valid quite generally. Due to K − multinucleon absorption in the nuclear medium the calculated widths of K − nuclear states are sizable, Γ K − ≥ 90 MeV, and exceed substantially their binding energies in all considered nuclei.

Strangeness in nuclei and neutron stars

“…More recently, the Jerusalem-Prague Collaboration has reanalyzed kaonic atoms by using the K − optical potentials derived from state-of-the-art chirally-motivated meson-baryon coupled-channel models, which were supplemented by a phenomenological term representing K − multi-nucleon interactions [162,163]. Fig.…”

On the widths and binding energies of K− nuclear states and the role of K− multi-nucleon interactions

“…Here we present only few selected results, for more details see Refs. [1,2]). The self-consistently evaluated energy shift δ √ s from Eq (5) is strongly density dependent which plays important role in calculations of kaonic nuclear, as well as atomic states.…”

“…The self-consistently evaluated energy shift δ √ s from Eq (5) is strongly density dependent which plays important role in calculations of kaonic nuclear, as well as atomic states. Figure 3 illustrates the strong density dependence of δ √ s in 208 Pb, calculated selfconsistently within the P and KM models augmented by the FD variant of V (2) K − with α = 1 (P1, KM1) and α = 2 (P2, KM2). The P1 and KM1 models yield smaller energy shift with respect to the K − N threshold than the original single-nucleon potentials V (1) K − (P and KM).…”

Calculations of kaonic nuclei based on chiral meson-baryon coupled-channel interaction models

“…In this contribution, we report on our very recent calculations of K − -nuclear quasi-bound states using the above mentioned chiral models of meson-baryon interactions [8,9]. The K − singlenucleon potential is supplemented by a phenomenological K − multinucleon potential fitted recently to kaonic atom data for each of the chiral models separately [1].…”