Investigation of sup 36 Ar and sup 38 Ar nuclei via inelastic electron scattering

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5259848

Foltz, C W

Inelastic electron scattering form factors were measured for {sup 36}Ar and {sup 38}Ar, using electrons with incident energies of 25, 35, 42, 55 MeV and a scattering angle of 153{degree}. Data for nuclear excitation energies from 6.5 to 15.0 MeV were acquired; elastic spectra were also recorded. Form factors of 69 (for {sup 36}Ar) and 54 (for {sup 38}Ar) inelastic transitions were obtained through normalization to the elastic form factors. The multipolarities of 34 (for {sup 36}Ar) and 22(for {sup 38}Ar) transitions were determined, using a model-independent analysis of Plane-Wave equivalent form factors, and corresponding reduced transition probabilities were deduced. The reduced transition probabilities from this study were compared with those form previous experiments, and with theoretical expectations. The transitions identified as magnetic dipole (M1) in this work, for both {sup 36}Ar and {sup 38}Ar, were compared with recent theoretical predictions obtained from a configuration-mixed shell model calculation which incorporated the full 2s-1d shell. In {sup 36}Ar, the present experiment measured a total M1 strength which was approximately 86% of the strength predicted in the measured energy range, and the M1 strength agreed qualitatively with the calculations. For {sup 38}Ar, the single strong M1 transition predicted by the shell model calculation was not observed, and the M1 strength was instead found to be highly fragmented, although the total observed M1 strength was reasonably consistent with the calculations.

• Research Organization: Catholic Univ. of America, Washington, DC (United States)
• OSTI ID: 5259848
• Country of Publication: United States
• Language: English

Related Subjects

663220* -- Electromagnetic Transitions-- (1992-)
663530 -- Nuclear Mass Ranges-- A=20-38-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ARGON 36
ARGON 38
ARGON ISOTOPES
CHARGED-PARTICLE REACTIONS
COMPARATIVE EVALUATIONS
ELECTRON REACTIONS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVALUATION
EVEN-EVEN NUCLEI
FORM FACTORS
INELASTIC SCATTERING
ISOTOPES
LEPTON REACTIONS
LIGHT NUCLEI
M1-TRANSITIONS
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 100-1000
MULTIPOLE TRANSITIONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
PARTICLE PROPERTIES
SCATTERING
SHELL MODELS
STABLE ISOTOPES