Coincidence measurements of the (. pi. sup + ,. pi. sup 0 p ) reaction at T sub. pi. sup + =165 MeV

Journal Article · Fri Mar 01 04:00:00 EST 1991 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.43.1255· OSTI ID:6042794

Hoibraten, S; Gilad, S; Burger, W J; Redwine, R P ^[1]; Piasetzky, E; Baer, H W; Bowman, J D; Cverna, F H; Irom, F; Leitch, M J ^[2]; Knudson, J N ^[3]; Wood, S A ^[4]; Rokni, S H ^[5]

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1. Massachusetts Institute of Technology, Cambridge, Massachusetts (USA). Department of Physics Massachusetts Institute of Technology, Cambridge, Massachusetts (USA). Laboratory for Nuclear Science
2. Los Alamos National Laboratory, Los Alamos, New Mexico (USA)
3. Department of Physics, Arizona State University, Tempe, Arizona (USA)
4. School of Physics and Astronomy, Raymond and Beverly Sackler Faculty, Tel Aviv University, Ramat Aviv 69978 (Israel)
5. Department of Physics, Utah State University, Logan, Utah (USA)

We report coincidence measurements of the ({pi}{sup +},{pi}{sup 0}{ital p}) reaction at a beam energy of {ital T}{sub {pi}}{sup +}=165 MeV. The neutral pions were detected by the LAMPF {pi}{sup 0} spectrometer and the protons by an array of plastic-scintillator telescopes. The resulting energy resolution for the determination of the excitation energy of the residual nucleus was about 10 MeV. Measurements were performed on {sup 16}O at laboratory angles {theta}{sub {pi}}{sup 0}=70{degree}, 80{degree}, 110{degree}, and 130{degree}. The cross section is predominantly quasifree. Its angular dependence follows the trend of the free single-charge-exchange cross section at back angles and is somewhat suppressed relative to this at more forward angles. Events corresponding to removal of {ital p}-shell nucleons were identified by their {pi}{sup 0} and {ital p} energies. The {pi}{sup 0} energy spectra for such events are compared to similar pion energy spectra for the {sup 16}O({pi}{sup {plus minus}},{pi}{sup {plus minus}}{ital p}) reactions; the cross-section ratios are consistent with ratios calculated from isospin coupling alone. {pi}{sup 0} energy spectra are also compared to predictions of {Delta}-hole model calculations; the calculations for events in which protons are detected at the conjugate quasifree angle underestimate the ({pi}{sup +},{pi}{sup 0}{ital p}) cross sections by 30--55 %. At {theta}{sub {pi}}{sup 0}=110{degree} the ({pi}{sup +},{pi}{sup 0}{ital p}) reaction was also studied on Fe, Sn, and Pb. No significant {ital A} dependence of the cross section was observed.

• OSTI ID: 6042794
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 43:3; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BOSONS
CHARGED-PARTICLE REACTIONS
COINCIDENCE METHODS
COUNTING TECHNIQUES
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
HADRON REACTIONS
HADRONS
INFORMATION
IRON ISOTOPES
ISOTOPES
LEAD ISOTOPES
MESON REACTIONS
MESONS
MEV RANGE
MEV RANGE 100-1000
NUCLEAR REACTIONS
NUMERICAL DATA
OXYGEN 16 TARGET
PION PLUS REACTIONS
PION REACTIONS
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS
TARGETS
TIN ISOTOPES