Multinucleon pion absorption in the sup 4 He(. pi. sup + , ppp ) n reaction

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

DOI:https://doi.org/10.1103/PhysRevC.43.1553· OSTI ID:5737858

Weber, P; McAlister, J; Olszewski, R; Feltham, A; Hanna, M; Johnson, R R; Pavan, M; Ponting, C; Rozon, F M; Sevior, M; Sossi, V; Vetterli, D ^[1]; Humphrey, D; Lolos, G J; Papandreou, Z ^[2]; Tacik, R ^[3]; Ottewell, D; Sheffer, G; Smith, G R ^[4]; Mardor, Y ; May-Tal, S ^[5]

---

1. University of British Columbia, Vancouver, British Columbia, Canada V6T 2A6 (CA)
2. University of Regina, Regina, Saskatchewan, Canada (CA)
3. University of Karlsruhe, 7500 Karlsruhe, Federal Republic of Germany (DE)
4. TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada (CA)
5. Raymond and Beverly Sackler Faculty of Exact Sciences, Department of Physics, Tel-Aviv University, Ramat Aviv, Israel 69978 (IL)

Three-proton emission cross sections for the {sup 4}He({pi}{sup +},{ital ppp}){ital n} reaction were measured at an incident pion kinetic energy of {ital T}{sub {pi}}{sup +}=165 MeV over a wide angular range in a kinematically complete experiment. Angular correlations, missing momentum distributions, and energy spectra are compared with three- and four-body phase-space Monte Carlo calculations. The results provide strong evidence that most of the three-proton coincidences result from three-nucleon absorption. From phase-space integration the total three-nucleon absorption cross section is estimated to be {sigma}{sup 3{ital N}}=4.8{plus minus}1.0 mb. The cross section involving four nucleons is small and is estimated to be {sigma}{sup 4{ital N}}{lt}2 mb. On the scale of the total absorption cross section in {sup 4}He, multinucleon pion absorption seems to represent only a small fraction.

• OSTI ID: 5737858
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Journal Name: Physical Review, C (Nuclear Physics); (USA) Vol. 43:4; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651220* -- Nuclear Properties & Reactions
A=1-5
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR CORRELATION
BARYONS
CAPTURE
CHARGED-PARTICLE REACTIONS
COINCIDENCE METHODS
COINCIDENCE SPECTROMETRY
CORRELATIONS
COUNTING TECHNIQUES
CROSS SECTIONS
DISTORTED WAVE THEORY
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY SPECTRA
FERMIONS
FOUR-BODY PROBLEM
HADRON REACTIONS
HADRONS
HELIUM 4 TARGET
IMPULSE APPROXIMATION
MANY-BODY PROBLEM
MATHEMATICAL SPACE
MESON REACTIONS
MEV RANGE
MEV RANGE 100-1000
MONTE CARLO METHOD
NEUTRONS
NUCLEAR REACTIONS
NUCLEONS
PAULI PRINCIPLE
PHASE SPACE
PION PLUS REACTIONS
PION REACTIONS
PROTONS
SPACE
SPECTRA
TARGETS
TOTAL CROSS SECTIONS