K+ and π+ momentum spectra from 2.5-3.1 GeV/c protons on carbon and two-body final-state spectral peaks from (p ,K+) and (p ,π+) reactions

A partially separated 0.9-1.8 GeV/c K⁺ beam at the Bevatron was utilized as a spectrometer (0.9% full width at half maximum) to study the K⁺ and π⁺ momentum spectra at 0° from carbon and other target elements bombarded by 2.5-3.1 GeV/c protons. Searches were made for possible spectral peaks resulting from two-body final state reactions such as ¹²C(p,K⁺)¹³C_Λ and ¹²C(p,π⁺)¹³C. Spectral peaks observed from p(p ,π⁺)d assisted in calibrating the apparatus, and a spectral structure attributed to p [p ,K⁺](p Λ)^* was observed, where (pΛ)^* represents p and Λ with low relative momentum. No other K⁺ or π⁺ spectral peaks appeared above background; upper limits are given which this experiment places on (dσdΩ)_c.m. at 0°. The K⁺ and π⁺ momentum spectra at 0° from carbon bombarded by 2.50, 2.70, 2.89, and 3.10 GeV/c protons are also given. NUCLEAR REACTIONS Hypernuclei p (p,K⁺)(p Λ)^*, E=1.9-2.3 GeV; measured σ(Eθ=0) near maximum K⁺ momentum; results poorly fitted by Goldberger-Watson type calculation of p-Λ final state interaction. ¹²C(p,K⁺), ¹²C(p,π⁺), E=1.7-2.3 GeV; measured σ(Eθ=0,P). ¹²C(p,π⁺)¹³C, ¹²C(p,K⁺)¹³C_Λ, ⁹Be(p,K⁺)¹⁰Be_Λ, ⁵⁶Fe(p,K⁺)⁵⁷Fe_Λ, E=1.7 GeV; d (p,K⁺)³H_Λ, E=1.9 GeV; ¹²C(p,K⁺)¹³C, E=1.9,2.1 GeV; searched and set upper limits on σ(E θ=0) deduced qualitative upper limit to high momentum components of Λ in ¹³C_Λ.