Inclusive measurements of pion double charge exchange and inelastic scattering on [sup 3]He
A measurement was made at the Los Alamos Meson Physics Facility (LAMPF) of the doubly differential cross sections for three inclusive pion reactions on [sup 3]He: [pi][sup [minus]] double charge exchange (DCX), and [pi][sup +] and [pi][sup [minus]] inelastic scattering. The cross sections for DCX were measured at incident energies of 120, 180, 210, and 240 MeV, and at angles of 25, 50, 80, 105, and 130[degrees], while inelastic scattering cross sections were measured at 120, 180, and 240 MeV and scattering angles of 50, 80, 105, and 130[degrees]. The final pion energy spectrum was measured from 10 MeV up to the kinematic limit. In the [Delta] resonance region, where the isospin T=3/2 channel dominates, the inelastic [pi][sup [minus]] scattering should be almost entirely from the lone neutron in [sup 3]He. The [pi][sup +] inelastic scattering was expected to have significant contributions from both single and double scattering, because the T = 3/2 channel favors [pi][sup +]-p scattering from the two protons in [sup 3]He. The [sup 3]He DCX spectra are similar to those observed for DCX in [sup 4]He. The forward angle double peaks can be understood as a consequence of sequential single charge exchange (SSCX). Calculations using the SSCX model are in rough agreement with the measured shape of the [sup 3]He DCX spectra. The doubly differential cross sections measured for the inelastic scattering reactions exhibit a strong enhancement near the kinematics for free [pi][sup [minus]]-p scattering. The ratios of [pi][sup +] to [pi][sup [minus]] scattering cross sections may indicate multiple scattering, as well as the agreement of the low outgoing energy part of the [pi][sup +] inelastic scattering spectra with the corresponding properly scaled DCX spectra. A distorted-wave impulse-approximation (DWIA) calculation of the quasielastic cross sections has been performed and a comparison made with the measured inelastic cross sections.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6521863
- Report Number(s):
- LA-12559-T; ON: DE93014377
- Resource Relation:
- Other Information: Thesis
- Country of Publication:
- United States
- Language:
- English
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Pion double charge exchange and inelastic scattering on {sup 3}He
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Related Subjects
HELIUM 3 TARGET
PION REACTIONS
CHARGE EXCHANGE
INELASTIC SCATTERING
CHARGE CONSERVATION
DIFFERENTIAL CROSS SECTIONS
IMPULSE APPROXIMATION
INCLUSIVE INTERACTIONS
ISOSPIN
MEV RANGE 100-1000
MULTIPLE SCATTERING
PHASE SPACE
PION-NEUTRON INTERACTIONS
PION-PROTON INTERACTIONS
PIONS MINUS
PIONS PLUS
BOSONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MATHEMATICAL SPACE
MESON REACTIONS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
MEV RANGE
NUCLEAR REACTIONS
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PION-NUCLEON INTERACTIONS
PIONS
PSEUDOSCALAR MESONS
SCATTERING
SPACE
TARGETS
662340* - Hadron Interactions- (1992-)