PION PRODUCTION IN NEUTRON-PROTON COLLISIONS AT BEVATRON ENERGIES (thesis)
Neutrons from a target bombarded by 6.2-Bev protons produced 330 threc- prong and 34 five-prong events in a hydrogen-filled cloud chamber. These events werc analyzed in an IBM program of constrained solutions. Fresuencies for nine different particle configurations are estimated. The energy spectrum of the beam neutrons is obtained. Histograms for center-of-mass (c.m.) momentum and angles as well ss Q values between emitted particles and their c.m. angles sre shown for the particle configurations. In all of the particle configurations, the two nucleons tend to be emitted in opposite directions in the c.m. system, one going forward and the other going backward. Both the opposite-direction effect and forward-backward effect are greater at Bevatron energies than at Cosmotron energies and decrease as the number of pions produced is increased. In the pn+- reaction, ideograms of Q(p pi /sup +), Q(n pi ), and especially the sum of these distributions show a good fit to the T = 3/2 interaction cross section observed in pi /sup +/ p scattering, as weighted by the two-body phase-space factor. In the pp reaction, the Q(p pi -) dis tributions show evidence for the T = 3/2 resonance and the proposod T = 1/2 resonance observed in single pi /sup +/ photo- production. In the pn+- reaction, the protons are peaked strongly backward, while in the pn+-0.. and pn++-- the protons tend toward forwand emission. In the Q( pi pi ) distributions, evidence is found for pion-pion interactions in isotopic spin state T = 2. A proposed phenomenological, directional-isobar model of multiplepion production is found to be successful in its predictions. In this model it is assumod that each nucleon during a grazing-type collision is excited to the T = 3/2 isobaric state or a higher T = 1/2 isobaric state by absorbing or emitting a single pion, and subsequently decays by single- or double-pion emission. (auth)
- Research Organization:
- California. Univ., Berkeley. Lawrence Radiation Lab.
- DOE Contract Number:
- W-7405-ENG-48
- NSA Number:
- NSA-13-005792
- OSTI ID:
- 4275093
- Report Number(s):
- UCRL-8559
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-59
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ABSORPTION
ANGULAR DISTRIBUTION
BETATRONS
BEVATRON
CLOUD CHAMBERS
COSMOTRONS
CROSS SECTIONS
DECAY
EMISSION
ENERGY
ENERGY RANGE
EXCITATION
FAST NEUTRONS
HYDROGEN
INTERACTIONS
IRRADIATION
ISOSPIN
MOMENTUM
NEUTRON BEAMS
NEUTRONS
NUCLEONS
PARTICLE MODELS
PHOTOPRODUCTION
PIONS
PRODUCTION
PROGRAMMING
PROTON BEAMS
PROTONS
Q-VALUE
RESONANCE
SCATTERING
SPECTRA
SYNCHROTRONS
TARGETS