Nucl.Phys.B

The dp → nnp π + , dp → ppn π 0 and dp → ppp π - reactions at 3.33 GeV/ c deuteron momentum on the proton target were studied in order to search for a ΔΔ configuration in the deuteron. The frequent backward emission of the (p π + ), (n π o ) and (p π − ) systems in the deuteron rest frame was observed. The origin of the effect was analysed from the point of view of a possible ΔΔ admixture in the deuteron wave function. Some other sources which may contribute to the signal are indicated.

Nucl.Phys.B

The charge exchange deuteron break up dp→npp was studied at 3.33GeV/ c deuteron momentum in the 1 m hydrogen bubble chamber. The contribution of the spin-independent amplitude to the np→pn charge exchange reaction for low t values was estimated. Various mechanisms playing a role in the process considered are discussed.

Nuovo Cim.A

The differential cross-sections for elastic scattering of π+ and π− mesons on4He have been measured at 68 and 154 MeV with a high-pressure helium streamer chamber. A phase-shift analysis (ACE method) has been carried out. The importance of the high partial waves is discussed.

Nuovo Cim.A

The cross-section for the\(\pi ^ ++ ^4 He \to \pi ^ -+ 4p\) reaction has been measured with a high-pressure helium streamer chamber triggered by a scintillation counter hodoscope. Measurements were made for angles between 25° and 165°. Supposing the angular distribution of the secondary meson to be isotropic, we obtained the following total cross-section for the double charge exchange:\(\sigma _{tot}= \left( {0.30 \pm 0.15} \right) \cdot 10^{ - 27} cm^2 \). The obtained value turned out to be somewhat smaller than expected from calculations using the pair correlation model.

Nuovo Cim. A

The differential cross-sections for the elastic scattering of π+ and π− mesons on3He have been measured at 154 MeV with a high-pressure streamer chamber for angles between 30° and 160° (c.m.s.). The total elastic cross-sections are also presented.