Proton scattering from /sup 24/Mg at 0. 8 GeV

Journal Article · Mon Oct 01 04:00:00 EDT 1979 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.20.1490· OSTI ID:6034711

Blanpied, G; Hintz, N M; Kyle, G S; Palm, J W; Liljestrand, R; Barlett, M; Harvey, C; Hoffmann, G W; Ray, L; Madland, D G

Angular distributions for the elastic and inelastic scattering of 800 MeV protons from /sup 24/Mg are presented. Results of distorted-wave Born-approximation (DWBA) and coupled-channels (CC) analyses of the data for the 0/sup +//sub 1/, 2/sup +//sub 1/, 4/sup +//sub 1/, and 6/sup +//sub 1/ members of the ground state rotational band, the 2/sup +//sub 2/, 3/sup +//sub 2/, 4/sup +//sub 2/, and 5/sup +//sub 2/ members of the ..gamma.. band and the 0/sup +/ member of the ..beta.. band are discussed, and the effects of ground state deformation and multistep contributions are assessed. The DWBA calculations for the 4/sup +//sub 1/ and 6/sup +//sub 1/ angular distributions fail to even qualitatively reproduce the data, while a CC calculation, using a symmetric rotator model with quadrupole and hexadecapole ground state deformations, provides good fits for the 0/sup +//sub 1/, 2/sup +//sub 1/, and 4/sup +//sub 1/ angular distributions. A CC calculation in which the ground band is coupled to the ..gamma.. band, with an assumed asymmetric vibrational amplitude, gives a fair fit to the data for the 2/sup +//sub 2/ state, but fails to fit the 3/sup +//sub 2/, 4/sup +//sub 2/, and 5/sup +//sub 2/ data. This failure in the calculation may be due to the lack of a direct step to the 4/sup +//sub 2/ state, as well as neglect of the spin-flip process. The result of coupling the ground band with the 6.43 MeV 0/sup +//sub ..beta../ state indicates that this axially symmetric deformed vibrational model may be essentially correct, but also seems to indicate that a direct 0/sup +//sub 1/-0/sup +//sub ..beta../ step needs to be considered, based on the behavior of the forward angle 0/sup +//sub ..beta../ data. Additional coupling of a 2/sup +//sub ..beta../ state does not dramatically improve the fit to the 0/sup +//sub ..beta../ data. The results obtained here from analyses of the 800 MeV data are compared with those obtained through analyses of lower energy data.

• Research Organization: New Mexico State University, Las Cruces, New Mexico 88003
• OSTI ID: 6034711
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 20:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BARYON REACTIONS
BETA DECAY
BORN APPROXIMATION
CHARGED-PARTICLE REACTIONS
COUPLED CHANNEL THEORY
DECAY
DEFORMATION
DISTRIBUTION
DWBA
ELASTIC SCATTERING
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
EXCITED STATES
HADRON REACTIONS
INELASTIC SCATTERING
ISOTOPES
LIGHT NUCLEI
MAGNESIUM 24
MAGNESIUM 24 TARGET
MAGNESIUM ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 100-1000
NUCLEAR DEFORMATION
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
OPTICAL MODELS
PARITY
PARTICLE PROPERTIES
PROTON REACTIONS
ROTATIONAL STATES
SCATTERING
SHELL MODELS
SPIN
STABLE ISOTOPES
TARGETS
VIBRATIONAL STATES