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Triple-differential cross sections of the (. pi. /sup +//,pp) reaction on lithium isotopes

Technical Report ·
OSTI ID:6987600
; ; ; ; ; ; ; ; ;
The (..pi../sup +/,pp) reactions on /sup 6/Li and /sup 7/Li have been studied at T/sub ..pi../ = 59.4 MeV with high resolution. The first triple-differential cross sections for these reactions are presented. The data are fitted to a T-matrix and compared to the ..pi../sup +/d ..-->.. pp reaction. A model in which the pion is absorbed on a /sup 3/S/sub 1/ (pn) pair in the lithium nucleus describes many features of the data very well. An extrapolation of our data into unmeasured regions of phase space suggests that about 60% of the pion absorption cross section on /sup 6/Li at 59.4 MeV goes into the (..pi../sup +/,pp) channel. One surprising feature of the data is that the /sup 6/Li(..pi../sup +/,pp)/sup 4/He (2/sup -/) transition at 22.1 MeV excitation is strongly populated, similar to what is observed in the /sup 6/Li(d,..cap alpha..)/sup 4/He reaction. This transition involves removing one nucleon from the 1p shell and one from the 1s shell. 25 refs., 15 figs., 3 tabs.
Research Organization:
Carnegie-Mellon Univ., Pittsburgh, PA (USA); Kyoto Sangyo Univ. (Japan); Massachusetts Inst. of Tech., Cambridge (USA); Massachusetts Inst. of Tech., Cambridge (USA). Plasma Fusion Center; Washington Univ., Seattle (USA)
DOE Contract Number:
AC02-76ER03244; W-7405-ENG-36
OSTI ID:
6987600
Report Number(s):
DOE/ER/03244-130; ON: DE87003380
Country of Publication:
United States
Language:
English

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Related Subjects

651320* -- Nuclear Properties & Reactions
A=6-19
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA DECAY RADIOISOTOPES
BARYONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY SPECTRA
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FERMIONS
HADRON REACTIONS
HADRONS
HELIUM 4
HELIUM 5
HELIUM ISOTOPES
INFORMATION
ISOTOPES
LIGHT NUCLEI
LINEAR MOMENTUM
LITHIUM 6 TARGET
LITHIUM 7 TARGET
MATRICES
MESON REACTIONS
MEV RANGE
MEV RANGE 10-100
MONTE CARLO METHOD
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUMERICAL DATA
PION PLUS REACTIONS
PION REACTIONS
PROTONS
RADIOISOTOPES
S MATRIX
SPECTRA
STABLE ISOTOPES
TARGETS