Pion absorption on /sup 3/He at T/sub. pi. / = 62. 5 and 82. 8 MeV

Journal Article · Thu May 01 04:00:00 EDT 1986 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.33.1714· OSTI ID:5713370

Aniol, K A; Altman, A; Johnson, R R; Roser, H W; Tacik, R; Wienands, U; Ashery, D; Alster, J; Moinester, M A; Piasetzky, E

Pion absorption in /sup 3/He was studied at T/sub ..pi../ = 62.5 and 82.8 MeV using nucleon-nucleon coincidences. For ..pi../sup +/ absorption on proton-neutron pairs the differential cross section is the same as that for ..pi../sup +/+d..-->..p+p except for an increase by a factor of about 1.5. For ..pi../sup -/ absorption on the proton-proton pair, the differential cross section is asymmetric about 90/sup 0/, indicating possible isospin mixing. The total cross sections sigma/sub pn/(..pi../sup +/) are 10.2 +- 0.9 mb and 13.5 +- 1.3 mb at 62.5 and 82.8 MeV and for sigma/sub pp/(..pi../sup -/) are 0.70 +- 0.07 mb and 0.92 +- 0.10 mb at 62.5 and 82.8 MeV. The three-body absorption cross sections for ..pi../sup +/ and ..pi../sup -/ are found to be comparable to each other and show no strong energy dependence. The three-body absorption cross section sigma/sub 3/(..pi../sup +/) is 6.7 +- 2.5 mb and 5.7 +- 2.3 mb and for ..pi../sup -/, sigma/sub 3/(..pi../sup -/) is 8.7 +- 1.4 mb and 6.5 +- 2.0 mb at 62.5 and 82.8 MeV, respectively.

• Research Organization: Department of Physics and Astronomy, California State University, Los Angeles, California 90032; Department of Physics, University of British Columbia, Vancouver, British Columbia, Canada V6T 2A6
• OSTI ID: 5713370
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 33:5; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651225* -- Nuclear Properties & Reactions
A=1-5
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BARYONS
CAPTURE
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY DEPENDENCE
ENERGY RANGE
FERMIONS
HADRON REACTIONS
HADRONS
HELIUM 3 TARGET
ISOSPIN
MANY-BODY PROBLEM
MESON REACTIONS
MEV RANGE
MEV RANGE 10-100
NUCLEAR REACTIONS
NUCLEONS
PARTICLE PROPERTIES
PION PLUS REACTIONS
PION REACTIONS
TARGETS
THREE-BODY PROBLEM
TOTAL CROSS SECTIONS