OBSERVATIONS ON THE LONG-RANGE INTERACTIONS OF PIONS. I. PRELIMINARY RESULTS ON THE COHERENT PRODUCTION OF TWO CHARGED PIONS BY PIONS AT 14 Gev

Journal Article · Tue Aug 01 04:00:00 EDT 1961 · Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B

OSTI ID:4840298

Baldassarre, F; Caforio, A; Ferraro, D

A stack of nuclear emulsion is scanned after exposure to a 14-Bev/c pi / sup -/ beam. Events with three outgoing relativistic tracks (''tridents'') are analyzed in order to determine whether the events are consistent with a pion-pair- production process in which the nucleus acts coherently. Examples of such proposed processes are diffraction dissociation and electromagnetic (Coulomb) production. Coherent events are characterized by extremely low momentum transfer to the target nucleus, and by the absence of nuclear excitation. Thirteen "tridents'' are found in which none of the outgoing particles is an electron. Five of these events satisfy the criteria for diffraction dissociation, and one of the 5 also satisfies the criteria for Coulomb production of a pion pair. From these data, only upper limits may be set for the cross sections of the proposed processes, because of the existence of incoherent processes. If it is assumed that the one possible case of Coulomb production is an example of a particular mechanism, an upper limit of 440 mb may be deduced for the pi - pi cross section at the T = J = 1 resonance. (auth)

• Research Organization: Universita, Bari, Italy
• NSA Number: NSA-15-031527
• OSTI ID: 4840298
• Journal Information: Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B, Journal Name: Nuovo Cimento (Italy) Divided into Nuovo Cimento A and Nuovo Cimento B Vol. Vol: (10), 21; ISSN NUCIA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BEAMS
CHARGED PARTICLES
COULOMB EXCITATION
CROSS SECTIONS
DIFFRACTION
ENERGY RANGE
GEV RANGE
INTERACTIONS
NUCLEAR EMULSIONS
NUCLEI
PAIR PRODUCTION
PARTICLE TRACKS
PHYSICS
PIONS
PRODUCTION
REACTION KINETICS
RELATIVITY THEORY
RESONANCE