Dominance of the two-nucleon mechanism in sup 16 O(. pi. sup + , pp ) at 115 MeV

Journal Article · Wed Apr 01 04:00:00 EST 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.45.1767· OSTI ID:7301048

Mack, D J; Roos, P G; Breuer, H; Chant, N S; Hyman, S D; Khazaie, F; Ritchie, B G; Silk, J D ^[1]; Kyle, G S; Amaudruz, P A; Bauer, T S; Ingram, C H.Q.; Renker, D; Schumacher, R A; Sennhauser, U ^[2]; Burger, W J ^[3]

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1. University of Maryland, College Park, Maryland 20742 (United States)
2. Paul Scherrer Institute, Villigen (Switzerland)
3. Massachusetts Institute of Technology, Bates Laboratory, Middleton, Massachusetts 01949 (United States)

Singles {sup 16}O({pi}{sup +},{ital p}) and coincidence {sup 16}O({pi}{sup +},2{ital p}){sup 14}N measurements have been made at {ital T}{sub {pi}}=115 MeV over an extended range of the phase space of the two final-state protons. The coincidence measurements have a missing-mass resolution of 4 MeV. The direct two-nucleon absorption cross section extracted from the data is 58{plus minus}8 mb. After corrections for final-state interactions, it was found that the two-nucleon {pi}{sup +}+{ital np}{r arrow}{ital pp} process accounts for about 76% of the total absorption cross section, and thus is the dominant absorption mechanism. Evidence for absorption on {ital s}-{ital p} pairs is seen as a broad bump near 32 MeV of excitation. At backward angles the inclusive {sup 16}O({pi}{sup +},{ital p}) spectra show a distinct absorption peak, an important feature not previously observed. Comparisons of distorted wave impulse approximation calculations to both the coincidence data and inclusive data are presented.

• OSTI ID: 7301048
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 45:4; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

663460 -- Meson- & Hyperon-induced Reactions & Scattering-- (1992-)
663520* -- Nuclear Mass Ranges-- A=6-19-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
CAPTURE
CHARGED-PARTICLE REACTIONS
COINCIDENCE METHODS
COINCIDENCE SPECTROMETRY
COUNTING TECHNIQUES
CROSS SECTIONS
DISTORTED WAVE THEORY
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FINAL-STATE INTERACTIONS
HADRON REACTIONS
HADRONS
IMPULSE APPROXIMATION
INCLUSIVE INTERACTIONS
INTERACTIONS
ISOTOPES
LIGHT NUCLEI
MESON REACTIONS
MEV RANGE
MEV RANGE 100-1000
NITROGEN 14
NITROGEN ISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
ODD-ODD NUCLEI
OXYGEN 16 TARGET
PARTICLE INTERACTIONS
PION PLUS REACTIONS
PION REACTIONS
PROTON SPECTRA
PROTONS
SPECTRA
STABLE ISOTOPES
TARGETS
TOTAL CROSS SECTIONS