Analysis of giant resonances in proton, /sup 3/He, and. cap alpha. scattering and the spin-flip strength in /sup 208/Pb

Journal Article · Wed May 01 04:00:00 EDT 1985 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.31.1715· OSTI ID:5754215

Morsch, H P; Cha, D; Wambach, J

In an attempt to study isovector spin-flip excitations and to find a consistent picture of giant resonances in /sup 208/Pb, we analyzed giant resonance data from 172 MeV ..cap alpha.. scattering, 140 MeV /sup 3/He scattering, and 200 MeV proton scattering. Using spectroscopic information from ..cap alpha.. scattering, a good description of recent /sup 3/He scattering data is obtained. A detailed analysis of results from different probes reveals differences between complex particle and proton spectra which are interpreted as due to spin-flip contributions. The spin-flip strength is estimated in a microscopic p-h model. At the scattering angles considered it gives resonant strength at approx.9 MeV dominated by 2/sup -/ excitations and further gives an increasing continuum yield towards higher excitation energies. The cross sections of these spin-flip excitations in (p,p') are comparable to giant resonance yields and have to be considered in order to obtain a description consistent with complex particle spectra. The continuum part of isoscalar excitations is rather different from that of isovector spin-flip excitations. These features are qualitatively understood from the nuclear matter response. Calculations using the semi-infinite nuclear slab model of Esbensen and Bertsch give an almost quantitative description of isoscalar and spin-isospin continuum.

• Research Organization: Institut fuer Kernphysik, Kernforschungsanlage Juelich, D-5170 Juelich, Federal Republic of Germany
• OSTI ID: 5754215
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 31:5; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651913 -- Nuclear Properties & Reactions
A=190-219
Theoretical-- Energy Levels & Transitions-- (-1987)
651915* -- Nuclear Properties & Reactions
A=190-219
Theoretical-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
ANGULAR MOMENTUM
BARYON REACTIONS
CHARGED-PARTICLE REACTIONS
DATA
ENERGY RANGE
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
GIANT RESONANCE
HADRON REACTIONS
HEAVY NUCLEI
HELIUM 3 REACTIONS
INELASTIC SCATTERING
INFORMATION
ISOSPIN
ISOTOPES
LEAD 208
LEAD 208 TARGET
LEAD ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 100-1000
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
PARITY
PARTICLE PROPERTIES
PARTICLE-HOLE MODEL
PROTON REACTIONS
PROTON SPECTRA
RESONANCE
SCATTERING
SPECTRA
SPIN
SPIN FLIP
STABLE ISOTOPES
TARGETS