Die Guajakreaktion

Ohne Zusammenfassung     

Differential cross-sections for pp → π−π+, K−K+ between 0.8 and 2.4 GeV/c

We present measurements from a spark chamber experiment of the differential cross-sections for $\text{p}$p → π^?π⁺, K^?K⁺ at 20 momenta in the range 0.8–2.4 GeV/c (c.m. energy 2.02 to 2.57 GeV). The c.m. angular range was $\text{?0.95 <}\text{cos}\text{θ}{}^1\text{< 0.95}$. There are about 2000π^?π⁺ events and about 300 K^?K⁺ events at each momentum.     

Polarization in π+p → K+Σ+ backward scattering at 3.5 GeV/c

In a counter and wire spark chamber experiment with a polarized target, backward kaons were detected, and the Σ⁺'s identified by a missing-mass technique. An average polarization of ?0.08 ± 0.05 was found for ?0.2 < u < 0.1 GeV².     

Reaction of 4,5-diaminopyrimidines with 2,5-hexanedione

Reaction of 2,5-hexanedione with various 4,5-diaminopyrimidines was found to lead to the formation of 5-(N-pyrryl)-4-aminopyrimidines. Structural assignments for the products obtained were made on the basis of nmr, ir, uv and mass spectral data.     

Antiproton-proton total elastic cross sections in the T and U regions (0.69−2.43 GeV/c)

Antiproton-proton total elastic cross sections at 21 incident momenta in the range 0.69 to 2.43 GeV/c have been deduced by combining p?p elastic differential cross sections over a c.m. angular range $\text{?0.95 ?}\text{cos}\text{θ}{}^1\text{? 0.93}$ with forward elastic cross sections derived from recent real-part measurements and p?p total cross sections. Two bumps are observed, at $\text{M}{}_1\text{? 2.155}$ and $\text{M}{}_2\text{? 2.345}\text{GeV}\text{/c}{}^2$, having widths of Г₁ ～ 0.135 and $\text{Г}{}_2\text{～ 0.135}\text{GeV}\text{/c}{}^2$. Corresponding structures in other p?p reaction channels are discussed.     

Electron production by 4.0 GeV/cπ+p interactions

We have investigated electron production in 4.0 GeV/cπ⁺pinteractions. Limits to direct electron pair production are measured and an example of ?⁰ or ω⁰ decay to e⁺e^? is observed. The ratio of the number of singly produced electrons to the total number of charged pions is less than 6 × 10^-5 (at the 95% confidence level).     

Reactions of 4,5-diaminouracils

Reactions of 4,5-diaminopyrimidines with various phthalic derivatives, depending on the conditions employed, led to pyrimidines with a 5-N-substituted phthalamic acid (III), 5-N-substituted phthalimide (II) and 4,5-bis-N-substituted phthalimide (VI).