Freiburg 1999 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 18: Theorie III

HK 18.5: Vortrag

Dienstag, 23. März 1999, 15:00–15:15, A

Strangeness Modes in Nuclei — •Evgeni Kolomeitsev¹ and Dmitri Voskresensky^1,2 — ¹GSI, 64291 Darmstadt — ²MEPhI, Moscow, Russia

Production of negative strangeness in reactions of inelastic anti–neutri
no scattering on a nucleus provides information on the modification of strange degrees of freedom in nuclear matter. We calculate cross-sections of the reaction channels ν_e(µ)→ e⁺(µ⁺) + K⁻ and ν_e(µ) + p → Λ + e⁺(µ⁺) and investigate their sensitivity to the medium effects. In particular, we consider effects induced by the presence of a low-energy excitation mode in the K⁻ spectrum, associated with the correlated Λ-particle and proton-hole states, and the renormalization of the weak interaction in medium. In order to avoid double counting, various contributions to anti-neutrino scattering are classified with the help of the optical theorem, formulated within the non-equilibrium Green’s function technique.