Systematic study of alpha-particle spectroscopic strengths using the (p,p. cap alpha. ) reaction at 101. 5 MeV

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 1979

OSTI ID:5162339

Carey, T A

Coincidence measurements of outgoing protons and alpha particles from (p,p..cap alpha..) quasi-free scattering on targets of /sup 16/O, /sup 20/Ne, /sup 24/Mg, /sup 28/Si, /sup 32/S, /sup 40/Ca, /sup 48/Ti, /sup 54/Fe, and /sup 66/Zn have been obtained for 101.5 MeV incident protons from the University of Maryland Sectored Isochronous Cyclotron. Because the target-to-target variations in final step p-..cap alpha.. kinematical conditions were small, the quasi-two-body reaction vertex was held essentially constant throughout the mass range 16 less than or equal to A less than or equal to 66, permitting a near complete isolation of the influences of target structure on the overall cross section. Although the primary purpose of the experiment was to study systematics of the ground state alpha strengths, measurements permitting extraction of spectroscopic information were also obtained for eight excited-state transitions. Exact DWIA calculations of (p,p..cap alpha..) energy sharing spectra (cross section as a function of outgoing proton energy) have been compared with the measured spectra to extract absolute alpha-particle spectroscopic factors in a systematic manner for all targets used. It was observed that the 101.5 MeV (p,p..cap alpha..) reaction exhibits a noticeable selectivity for the bound state radius parameter, limiting it to a value in the interval from approx. 1.2 fm to approx. 1.6 fm for targets with mass number A/sub T/ = 16-66. Within the range of allowed parameter variations the extracted absolute spectroscopic factors are in substantial agreement with 2s1d-shell model predictions, at least for those nuclei which should be well described by such a limited basis space. Furthermore, the relative ground state spectroscopic factors obtained from (p,p..cap alpha..) and (/sup 6/Li,d) exhibit virtually the same behavior as a function of target mass.

• Research Organization: Maryland Univ., Baltimore (USA)
• OSTI ID: 5162339
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
BARYON REACTIONS
CALCIUM 40 TARGET
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
DATA
DIRECT REACTIONS
DISTORTED WAVE THEORY
ENERGY RANGE
EXPERIMENTAL DATA
HADRON REACTIONS
INFORMATION
IRON 54 TARGET
MAGNESIUM 24 TARGET
MEV RANGE
MEV RANGE 100-1000
NEON 20 TARGET
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUMERICAL DATA
OXYGEN 16 TARGET
PROTON REACTIONS
QUASI-ELASTIC SCATTERING
QUASI-FREE REACTIONS
SCATTERING
SILICON 28 TARGET
SPECTROSCOPIC FACTORS
SULFUR 32 TARGET
TARGETS
TITANIUM 48 TARGET
ZINC 66 TARGET