Inclusive measurements of pion double charge exchange and inelastic scattering on {sup 3}He

Thesis/Dissertation · Tue Jun 01 04:00:00 EDT 1993

OSTI ID:10161967

Yuly, M E

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, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 10161967
• Report Number(s): LA--12559-T; ON: DE93014377
• Country of Publication: United States
• Language: English

Related Subjects

662340
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHARGE CONSERVATION
CHARGE EXCHANGE
DIFFERENTIAL CROSS SECTIONS
HADRON INTERACTIONS
HELIUM 3 TARGET
IMPULSE APPROXIMATION
INCLUSIVE INTERACTIONS
INELASTIC SCATTERING
ISOSPIN
MEV RANGE 100-1000
MULTIPLE SCATTERING
PHASE SPACE
PION REACTIONS
PION-NEUTRON INTERACTIONS
PION-PROTON INTERACTIONS
PIONS MINUS
PIONS PLUS