Multinucleon pion absorption in the 4He(π+,ppp)n reaction
Creators
- 1. University of British Columbia, Vancouver, British Columbia, Canada V6T 2A6 (Canada)
- 2. University of Regina, Regina, Saskatchewan, Canada (Canada)
- 3. University of Karlsruhe, 7500 Karlsruhe, Federal Republic of Germany (Germany, F.R.)
- 4. TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada (Canada)
- 5. Raymond and Beverly Sackler Faculty of Exact Sciences, Department of Physics, Tel-Aviv University, Ramat Aviv, Israel 69978 (Israel)
Description
Three-proton emission cross sections for the 4He(π+,ppp)n reaction were measured at an incident pion kinetic energy of Tπ+=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 σ3N=4.8±1.0 mb. The cross section involving four nucleons is small and is estimated to be σ4N<2 mb. On the scale of the total absorption cross section in 4He, multinucleon pion absorption seems to represent only a small fraction
Additional details
Publishing Information
- Journal Title
- Physical Review, C
- Journal Volume
- 43
- Journal Issue
- 4
- Series
- Phys. Rev., C.
- Journal Page Range
- 1553-1571
- ISSN
- 0556-2813
- CODEN
- PRVCA
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 22075262
- Subject category
- S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
- Descriptors DEI
- ANGULAR CORRELATION; CAPTURE; COINCIDENCE SPECTROMETRY; CROSS SECTIONS; DISTORTED WAVE THEORY; ENERGY SPECTRA; FOUR-BODY PROBLEM; HELIUM 4 TARGET; IMPULSE APPROXIMATION; MEV RANGE 100-1000; MONTE CARLO METHOD; NEUTRONS; PAULI PRINCIPLE; PHASE SPACE; PION PLUS REACTIONS; PROTONS; TOTAL CROSS SECTIONS
- Descriptors DEC
- BARYONS; CATIONS; CHARGED PARTICLES; COINCIDENCE METHODS; CORRELATIONS; COUNTING TECHNIQUES; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; HADRON REACTIONS; HADRONS; HYDROGEN IONS; HYDROGEN IONS 1 PLUS; IONS; MANY-BODY PROBLEM; MATHEMATICAL SPACE; MESON REACTIONS; MEV RANGE; NUCLEAR REACTIONS; NUCLEONS; PION REACTIONS; SPACE; SPECTRA; TARGETS