Experimental results on the total and differential cross sections and on the decay angular distribution for the reaction at energies between 0.3 GeV and 5.8 GeV are presented and compared with theoretical predictions.
It is shown that nonlocality in the alpha-nucleus potential increases the barrier penetrability. The range of nonlocality of the alpha-nucleus potential is estimated by comparing experimental and theoretical alpha decay rates.
A model is presented, in which the variation of the differential cross section at large momentum transfer is determined in terms of experimentally know quantities.
Both PP and PV decays can go only through symmetry breaking. An appropriate tensor interaction is introduced which is different for different quark-antiquark pairs. Agreement with experiment is good.
In the Regge pole model with the Pomeranchuk trajectory dominance, total cross sections of particles with any spin are proved to be spin independent at high energies. The factorizability of total cross sections,, is also proved.
Among 60 000 pictures obtained by means of 55 cm hydrogen bubble chamber exposed with 4.7 π- beam 349 events of the reaction π-p → π+π-n at small four momentum transfer have been selected. The distribution of the effective mass of π+π− system shows ϱo-, fo- resonances and some enhancement at 1.5 - 1.6 GeV that may be interpreted as a resonance with M = 1549 ±30 MeV, Γ = 100 ±25 MeV.