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Strangeness-changing response functions: an alternative approach to hypernuclear structure

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Abstract:

We study strangeness-changing response functions as an alternative description of hypernuclear structure. Hypernuclear states are treated in the same manner as any other conventional nuclear excitation that emerges from the response of the nuclear ground state to an external probe. The nuclear response is calculated using a random-phase approximation to an effective relativistic mean-field model that reproduces bulk properties of normal nuclei. The relevant meson-baryon vertices are constrained by imposing [iopmath latex="$SU(3)$"] SU(3) [/iopmath] -flavour symmetry, while the residual hyperon-particle-nucleon-hole interaction is assumed to be mediated by the two lightest [iopmath latex="$S = -1$"] S = -1 [/iopmath] mesons: the pseudoscalar kaon and its vector partner [iopmath latex="$K^*(892)$"] K*(892) [/iopmath] . We use this model to analyse the spectra of [iopmath latex="$^{16}_{Y}$"] 16Y [/iopmath] O and [iopmath latex="$^{40}_{Y}$"] 40Y [/iopmath] Ca hypernuclei.

Document Type: Miscellaneous

Affiliations: 1: Department of Physics, University of Colorado, Boulder, CO 80309, USA 2: Department of Physics, Florida State University, Tallahassee, FL 32306-4350, USA

Publication date: January 1, 2001

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