On the conservation laws for weak interactions

50 years of hypernuclear physics: I. The early experiments

A variant of the theory is proposed in which non-conservation of parity can be introduced without assuming asymmetry of space with respect to inversion.

Various possible consequences of non-conservation of parity are considered which pertain to the properties of the neutrino and in this connection some processes involving neutrinos are examined on the assumption that the neutrino mass is exactly zero.

On the Conservation Laws for Weak Interactions

envisaged limit by virtue of a limiting form for Clebsch-Gordon coefficients. A similar limiting form is given for Racah coefficients. (auth)

/pdf/the-range-energy-relation-in-emulsion-part-ii-the-3rinu9dsyv.pdf

The range-energy relation in emulsion. part ii. the theoretical range

Simultaneous exposures have been made of Ilford Gr.5 emulsion to magnetically analyzed mesons as well as to hydrogen and helium nuclei of various velocities. Measurements of the particle ranges have been made for equivalent proton energies of 1.295 MeV to 700 MeV. Individual particle momenta were known to better than one part in a thousand. Especial care was taken to maintain the emulsion density at an accurately measured value. Curves and formulae used for converting particle ranges to their proton equivalents at other emulsion densities are given. Detailed procedures for correcting ranges of particles that traverse gaps between pellicles are described. Various effects that influence range measurements are discussed. Comparisons with existing data are made. Good agreement is found to exist only when the emulsion densities are known, and a correct procedure is employed to adjust the measured ranges to standard conditions. An empirical correction of the Vigneron range table is made.

/pdf/the-range-energy-relation-in-emulsion-1gtwzh346u.pdf

The Range-energy relation in emulsion

The short-range hyperfragments from 800 Mev/c K/sup -/ interactions have been shown to possess mass values in the range A = 60 to 100, and an upper limit of 35 Mev has been placed on the value of their B/sub LAMBDA /. Details are tabulated for five pi -mesic decays attributed to hyperfragments of the same order of mass resulting from 0.8 and 1.5 Bev/c k/sup -/ interactions in emulsion. From these events, a more precise estimate of the upper limit of B/sub LAMBDA / is set at 25 Mev. (H.D.R.)

Binding Energy of Λ 0 Hyperons in Heavy Hypernuclei ( 60 A 100 )

A large emulsion stack, exposed at high altitude, has been used to study the decaymodes of K-particles which produce a single charged secondary. The 5 decay modes, K
 μ
 , χ, ϰ and τ′ have been recognized from the nature and energy of the charged secondary. The masses of the parent particles of the two-body decay modes, K
 μ
 and χ found from the mean range of the charged secondary are (976±7) me and (969±3) me respectively. Independent values derived from measurements of the scattering of the secondary track near the decay point are (954±17) me and (972±15) me respectively. The reliability of these mass values is discussed. An examination of the relative frequency of the decay modes in these experimental conditions indicates that the K
 μ
 -and χ-modes constitute respectively about 67 % and 20 % of all the K-particle decays: the Kβ, ϰ- and τ′-modes being present to about 9 %, 3 %, and 1 % respectively.

On the masses and modes of decay of heavy mesons produced by cosmic radiation

Observation of the decay at rest of a heavy particle

On the possible ejection of a meson-active triton from a nuclear disintegration

Remarks on the decay of a meson-active triton

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