The emission of Σ-hyperons from 3 037 K− capture stars at rest in nuclear emulsion has been studied The identification of the hyperons is discussed Charged Σ-hyperons are emitted from (176±10)% of all K−-stars while (96±06)% of them lead to the emission of both Σ-hyperons and π-mesons The Σ−/Σ+ ratio for all stars is 086±012 while for stars in which a π-meson is also emitted it is 045±010 The difference between this latter value and the markedly different value (20) obtained for K−-interactions at rest in a hydrogen bubble chamber is attributed to the Fermi motion of nucleons in the nucleus, and a dependence of the relative K− transition amplitudes on the energy of relative motion of the K−-meson and nucleon The branching ratio,R, of the number of Σ+ decays to π+ and proton respectively is 123±027 The stable prong distribution of the stars in which a hyperon is emitted, as well as the energy distribution of the Σ-hyperons at emission has been studied About 16% of all identified charged Σ-hyperons had an emission energy above 60 MeV, and had to be attributed to multi-nucleon interactions of the K−-meson It is estimated that the proportion of all multi-nucleon primary capture prccesses may be as high as (30÷40)% The interaction of a K−-meson with a pair of neutrons seems to occur rarely, if at all From the fraction of Σ+ emitting stars which also emit a π−-meson it is concluded that only about 10% of the π−-mesons fail to escape from the nucleus in which capture occurs This could be understood if K−-capture occurs predominantly in the peripheral region of the nucleus From a similar study of Σ− emitting stars it is found however that the proportion of π+ or π0-mesons, or both, that are absorbed in the nucleus is much higher Estimates are made of the mean free path in nuclear matter of Σ-hyperons and π0-mesons Most of the one-nucleon interactions leading to Σ-hyperon production take place with protons and the transition amplitudes corresponding to theT=1 state of isotopic spin is smaller than theT=0 transition amplitude

The interaction of K−-mesons with photographic emulsion nuclei

In this study of hyperfragment production by K--meson absorptions at rest in emulsion nuclei, an attempt has been made to estimate the contribution of heavy spallation hyperfragments to the total observed number. In a sample of 24 640 K--meson captures, 1612 secondary events have been attributed to the production and subsequent decay of hyperfragments. From a study of the characteristics of both the production and decay disintegrations, it is concluded that about one half of the observed hyperfragments consists of λ0-hyperons trapped in the heavy spallation products of silver and bromine and these are almost entirely confined to the (0/3) μm range interval. The consequences of their presence aie discussed.

/pdf/the-production-of-heavy-hyperfragments-by-k-meson-captures-42i5vfqqop.pdf

The production of heavy hyperfragments by K--meson captures at rest in emulsion nuclei

A systematic search has been made for decays of A0-hyperons around 5262 interactions of K--mesons at rest in photographic emulsion. From the 41 decays of correlated A0-hyperons observed in this sample, it has been estimated that (47±7)% of all K--meson interactions at rest in emulsion nuclei emit neutral hyperons. On consideration of the conservation of strangeness it is suggested that cryptofragments are formed in (30±7)% of all such K--meson absorptions and that the non-mesonic decays of these cryptofragments give rise to a considerable proportion of the protons of energies greater than 60 MeV emitted from K--meson captures.

/pdf/on-the-emission-of-neutral-hyperons-from-k-interactions-at-3258wrhxe2.pdf

On the emission of neutral hyperons from k - -interactions at rest with emulsion nuclei

A total of 3 480 K−-mesons has been observed. Of these 445 interact in flight, at a mean energy of 40 MeV and only their general characteristics have been studied. Little difference has been observed between the number of unstable charged particles (Σ±-hypersons and π±-mesons) in these interactions and those in the 3 035 interactions at rest. The 3 035 K−-interactions at rest have been studied in detail. In this paper (Part I) are given the results on those interactions in which π-mesons are emitted. An estimate of the Σ-hyperon nuclear potential is based on the energy spectrum of π-mesons emitted in the K−-interactions in which the only charged particles emitted are a π-meson and a Σ-hyperon. A detailed examination of the angular distribution of 2-pronged events, and of the sign ratio of the π-mesons, the prong distribution and energy release in all events has led to an estimate of the probabilities of absorption of positive and negative Σ-hyperons in the parent nucleus, and to a partition of the events between the various primary reactions.

The interaction and decay of K− mesons in photographic emulsion

Hyperonic atoms and hyperon-nucleon scattering amplitudes

A total of 3,480 K/sup -/-mesons were observed. Of these, 445 interact in flight, at a mean energy of 40 Mev and only their general characteristics were studied. Little difference was observed between the number of unstable charged particles ( SIGMA plus or minus -hyperons and pi plus or minus -mesons) in these interactions and those in the 3,035 interactions at rest. The 3,035 K/sup - /-interactions at rest were studied in detail. The results on those interactions in which pi -mesons are emitted are given. An estimate of the SIGMA -hyperon nuclear potential is based on the energy spectrum of pi -mesons emitted in the K/ sup -/-interactions in which the only charged particles emitted are a pi meson and a SIGMA -hyperon. A detailed examination of ihe angular distribution of 2- pronged events, and of the sign ratio of the pi -mesons, the prong distribution and energy release in all events led to an estimate of the probabilities of absorption of positive and negative SIGMA hyperons in the parent nucleus, and to a partition of the events between the various primary reactions. (auth)

The interaction and decay of K- mesons in photographic emulsion - Part I. General characteristics of K--Interactions and analysis of events in which a charged π-meson is emitted

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The interaction and decay of K- mesons in photographic emulsion - Part I. General characteristics of K--Interactions and analysis of events in which a charged π-meson is emitted