Isovector resonances in pion single-charge-exchange reactions

Conference · Wed Oct 01 04:00:00 EDT 1986

DOI:https://doi.org/10.1139/p87-093· OSTI ID:6729415

Bowman, J D

An experimental study of L = 0, 1, and 2 isovector resonances in pion charge-exchange reactions is reported. In these experiments well-understood, spherical, even-even nuclei were studied at 120, 165, and 230 MeV. The emphasis of the 165 MeV study was on L = 0, 1, and 2 isovector resonances as a function of the atomic mass of the target. The targets were Ca-40, Ni-60, Zr-90, Sn-120, Ce-140, and Pb-208. The 120 and 230 MeV studies were aimed at measuring the properties of the isovector resonances as function of bombarding energy for a few targets, Ca-40, Ni-60, and Sn-120. Double differential cross sections up to excitation energies of 60 MeV were measured out to angles extending well past the second maximum of the isovector quadrupole resonance angular distribution. Results of the experiments were found to be in good agreement with RPA-DWIA and other theoretical calculations as regards isovector dipole and monopole energies, widths and cross sections, and strong interaction radii. However, some problem in the distorted wave Born approximation treatment of the reaction mechanism or in the structure of the isobaric-analog state was indicated from measurements of the energy dependence of the maximum cross sections for the dipole and monopole resonances. 12 refs., 10 figs. (DWL)

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6729415
• Report Number(s): LA-UR-87-56; CONF-8610167-2; ON: DE87005117
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BASIC INTERACTIONS
BORN APPROXIMATION
BOSONS
CALCIUM 40 TARGET
CERIUM 140 TARGET
CHARGE-EXCHANGE REACTIONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
DWBA
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
GIANT RESONANCE
HADRON REACTIONS
HADRONS
INFORMATION
INTERACTIONS
LEAD 208 TARGET
MESON REACTIONS
MESONS
MEV RANGE
MEV RANGE 100-1000
NICKEL 60 TARGET
NUCLEAR REACTIONS
NUMERICAL DATA
PION MINUS REACTIONS
PION PLUS REACTIONS
PION REACTIONS
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS
RESONANCE
STRONG INTERACTIONS
TARGETS
TIN 120 TARGET
ZIRCONIUM 90 TARGET