sup 4 He(. pi. ,. pi. prime p ) sup 3 H reaction: Quasifree and resonance scattering

• Published in: Physical review. C, Nuclear physics Vol. 42:3
• Main Authors: Jones, M.K., Dehnhard, D., Nanda, S.K., Sterbenz, S.M., Morris, C.L., Plum, M., Zumbro, J.D., Hussein, A., Oakley, D.S., Smithson, M.J., Williams, A.L., McDonald, J., Bryan, M.A., Fuentes, A.H., Lynker, M., Crockett, D., Machuca, M.A., Mordechai, S., Moore, C.F.
• Format: Journal Article
• Language: English
• Published: United States 01-09-1990
• Subjects: 651220 - Nuclear Properties & Reactions, A=1-5, Experimental; ACCELERATORS; ANGULAR DISTRIBUTION; ANGULAR MOMENTUM; BARYONS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CHARGED-PARTICLE REACTIONS; CROSS SECTIONS; DIRECT REACTIONS; DISTORTED WAVE THEORY; DISTRIBUTION; ELEMENTARY PARTICLES; ENERGY LEVELS; ENERGY RANGE; FERMIONS; GIANT RESONANCE; HADRON REACTIONS; HADRONS; HELIUM 4 TARGET; HYDROGEN ISOTOPES; IMPULSE APPROXIMATION; INELASTIC SCATTERING; ISOTOPES; KNOCK-OUT REACTIONS; LAMPF LINAC; LIGHT NUCLEI; LINEAR ACCELERATORS; MESON FACTORIES; MESON REACTIONS; MEV RANGE; MEV RANGE 100-1000; NUCLEAR PHYSICS AND RADIATION PHYSICS; NUCLEAR REACTIONS; NUCLEI; NUCLEONS; ODD-EVEN NUCLEI; PARITY; PARTICLE PROPERTIES; PION MINUS REACTIONS; PION PLUS REACTIONS; PION REACTIONS; PROTONS; RADIOISOTOPES; RESONANCE; RESONANCE SCATTERING; SCATTERING; SPIN; TARGETS; TRITIUM; YEARS LIVING RADIOISOTOPES
• ISSN: 0556-2813; 1089-490X

Exclusive {sup 4}He({pi}{sup {plus minus}},{pi}{sup {plus minus}}{prime}{ital p}){sup 3}H spectra in the excitation energy range between 21.5 and 44 MeV in {sup 4}He were measured at {ital T}{sub {pi}}=180 MeV at several pion and proton angles. The cross section ratio {ital R}{sub {pi}{ital p}}={sigma}({pi}{sup +},{pi}{sup +}{prime}{ital p})/{sigma}({pi}{sup {minus}},{pi}{sup {minus}}{prime}{ital p}) was found to be between 1 and 2 near 22 MeV which is in the region of the {ital J}{sup {pi}}=2{sup {minus}}, {ital T}=0 state. Between 25 and 40 MeV in the continuum, which comprises the giant dipole resonance and broad 2{sup {minus}} and 2{sup +} states, {ital R}{sub {pi}{ital p}} ranges from 0.22 to 45 in sharp contrast to the predicted values of {approx}1 from a model assuming the entire yield is due to the sequential decay of a state of good isospin, and 6 to 9 from a distorted-wave impulse approximation calculation assuming quasifree proton knockout.