Effective interaction analysis of 500 MeV (p-arrow-right,p') excitation of low-lying states in /sup 40,48/Ca, /sup 90/Zr, and /sup 208/Pb

Journal Article · Mon Jun 01 04:00:00 EDT 1987 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.35.2185· OSTI ID:5854413

Barlett, M L; Hoffmann, G W; Ray, L

A nonrelativistic distorted wave Born approximation analysis, using a phenomenological effective proton-nucleon interaction to generate both optical and transition potentials, is made of new 500 MeV (p-arrow-right,p') data for excitation of low-lying states in /sup 40/Ca, /sup 48/Ca, /sup 90/Zr, and /sup 208/Pb. The data, differential cross section and analyzing power angular distributions for 5/sup 0/ less than or equal to theta/sub c.m./ less than or equal to 30/sup 0/, are well described using this effective interaction. Calculations using the impulse approximation to generate the optical and transition potentials do not adequately describe the data. As a further test of the 500 MeV empirical effective interaction, model-dependent neutron transition densities are deduced for excitations which are expected to be purely isoscalar, such as the first 3/sup -/ states of /sup 40/Ca and /sup 208/Pb. These are found to be qualitatively similar in strength and overall shape to the renormalized (x N/Z) model-independent proton densities determined from analysis of (e,e') data. Model-dependent neutron transition densities are also deduced for other excitations and are in reasonable agreement with results of analyses of other hadron plus nucleus scattering data. These results indicate that the 500 MeV isoscalar effective interaction is better than the free proton-nucleon scattering amplitudes (impulse approximation) as a starting point for analysis of (p,p') data aimed at detailed extraction of neutron transition densities and other nuclear structure information.

• Research Organization: Department of Physics, The University of Texas at Austin, Austin, Texas 78712
• OSTI ID: 5854413
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 35:6; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANALYZING POWER
BARYON REACTIONS
BORN APPROXIMATION
CALCIUM 40 TARGET
CALCIUM 48 TARGET
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DWBA
ENERGY RANGE
HADRON REACTIONS
IMPULSE APPROXIMATION
INELASTIC SCATTERING
LEAD 208 TARGET
MEV RANGE
MEV RANGE 100-1000
NUCLEAR REACTIONS
NUCLEON REACTIONS
OPTICAL MODELS
PROTON REACTIONS
SCATTERING
TARGETS
ZIRCONIUM 90 TARGET