The interactions of ? ? -mesons with complex nuclei in the energy range (100–800) MeV: II. The interaction lengths and elastic scattering of 750 MeV ? ? -mesons in G5 emulsion

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Abstract
A total of 100·5 m of track has been scanned in a block of emulsion exposed to the 750 MeV π−-meson beam of the Brookhaven cosmotron. Allowing for the beam contamination of 7%, the interaction lengths for the production of inelastic events and for elastic scattering with projected angles of 2 ≤ ø < 10° are (43·6±2·9) cm and (66·8±5·6) cm respectively. The geometrical interaction length is 29·3 cm. A comparison with the optical model of the nucleus gives a value for the absorption coefficient K=(1·5±0·2) 1013cm−1 and for the change in wave number k 1 = (1·84±0·06) 1013cm−l. The absorption coefficient corresponds to a mean free path in nuclear matter λ n = (6·7±0·9) 10−13cm, to an imaginary component of potential V 1 = (15±2) MeV and with the value of the change in wave number to a real potential V r = (36±1) MeV.