Free NN interaction, 50-1000 MeV

Conference · Sat Jan 01 04:00:00 EST 1983 · AIP Conf. Proc.; (United States)

OSTI ID:5559142

Bugg, D V

Phase shift solutions for pp elastic scattering are unique up to 800 MeV, and for np up to 500 MeV. There is excellent agreement between three analyses for all phase shifts delta and for elasticity parameters eta of dominant inelastic partial waves (/sup 1/D/sub 2/, /sup 3/F/sub 3/ and /sup 3/P/sub 2/). For low partial waves, notably /sup 3/P/sub 0/, /sup 3/P/sub 1/ and /sup 1/S/sub 0/, there are some disagreements about eta parameters, reflecting insensitivity of elastic data and some discrepancies amongst experiments. The need for further data is reviewed. Amplitudes for np ..-->.. pn between 140 and 500 MeV are known accurately from phase shift analysis, and are almost purely real; they are useful for extracting nuclear matrix elements from (p,n) reactions. The Paris potential is the best potential model fit to data up to 425 MeV, but there are some small systematic discrepancies with data. Whether or not dibaryon resonances exist at higher energies is still controversial. If they exist, they are associated with the onset of strong inelasticity, and are weakly coupled to both NN and ..pi..d channels. It seems likely that the structure observed in ..delta.. sigma/sub L/ and ..delta.. sigma/sub T/ at 550 MeV is due to weak coupling of NN to the large peak in the ..pi..d total cross section close to this energy. 44 references, 11 figures.

• Research Organization: Queen Mary College, London, England
• OSTI ID: 5559142
• Report Number(s): CONF-821050-
• Conference Information: Journal Name: AIP Conf. Proc.; (United States) Journal Volume: 57
• Country of Publication: United States
• Language: English

Related Subjects

653001* -- Nuclear Theory-- Nuclear Structure
Moments
Spin
& Models
653003 -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMPLITUDES
BARYON RESONANCES
BARYON-BARYON INTERACTIONS
BARYONS
CROSS SECTIONS
D WAVES
DIFFERENTIAL CROSS SECTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
F WAVES
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MATHEMATICAL MODELS
MATRIX ELEMENTS
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
NUCLEAR MODELS
NUCLEON-NUCLEON INTERACTIONS
P WAVES
PARTIAL WAVES
PARTICLE INTERACTIONS
POTENTIALS
PROTON-NEUTRON INTERACTIONS
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
RESONANCE PARTICLES
SCATTERING AMPLITUDES