Multinucleon effects in muon capture on [sup 3]He at high energy transfer

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.50.1771· OSTI ID:6909255

Kuhn, S E; Cummings, W J; Dodge, G E; Hanna, S S; King, B H ^[1]; Shin, Y M ^[2]; Congleton, J G; Helmer, R; Schubank, R B; Stevenson, N R; Wienands, U ^[3]; Lee, Y K ^[4]; Mason, G R ^[5]; King, B E ^[6]; Chung, K S; Lee, J M ^[7]; Rosenzweig, D P ^[8]

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1. Stanford University, Stanford, California 94305 (United States)
2. University of Saskatchewan, Saskatoon, Saskatchewan, S7N0W0 (Canada)
3. TRIUMF, Vancouver, British Columbia, V6T2A3 (Canada)
4. The Johns Hopkins University, Baltimore, Maryland 21218 (United States)
5. University of Victoria, Victoria, British Columbia, V8W3P6 (Canada)
6. Simon Fraser University, Burnaby, British Columbia, V5A1S6 (Canada)
7. Yonsei University, Seoul 120-749 (Korea, Republic of)
8. University of Washington, Seattle, Washington 98195 (United States)

Energy spectra of both protons and deuterons emitted following the capture of negative muons by [sup 3]He nuclei have been measured for energies above 15 MeV. A limited number of proton-neutron pairs emitted in coincidence were also observed. A simple plane wave impulse approximation (PWIA) model calculation yields fair agreement with the measured proton energy spectra, but underpredicts the measured rate of deuteron production above our energy threshold by a large factor. A more sophisticated PWIA calculation for the two-body breakup channel, based on a realistic three-body wave function for the initial state, is closer to the deuteron data at moderate energies, but still is significantly lower near the kinematic end point. The proton-neutron coincidence data also point to the presence of significant strength involving more than one nucleon in the capture process at high energy transfer. These results indicate that additional terms in the capture matrix element beyond the impulse approximation contribution may be required to explain the experimental data. Specifically, the inclusion of nucleon-nucleon correlations in the initial or final state and meson exchange current contributions could bring calculations into better agreement with our data. A fully microscopic calculation would thus open the possibility for a quantitative test of multinucleon effects in the weak interaction.

• OSTI ID: 6909255
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 50:4; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BASIC INTERACTIONS
CAPTURE
CHARGED-PARTICLE REACTIONS
ELEMENTARY PARTICLES
EMISSION
ENERGY SPECTRA
FERMIONS
HELIUM 3 TARGET
IMPULSE APPROXIMATION
INTERACTIONS
LEPTON REACTIONS
LEPTONS
MASSLESS PARTICLES
MATRIX ELEMENTS
MUON REACTIONS
MUONS
MUONS MINUS
NEUTRINOS
NEUTRON EMISSION
NUCLEAR REACTIONS
SPECTRA
TARGETS
WEAK INTERACTIONS