High resolution study of proton resonances in /sup 57/Co

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1980

OSTI ID:6244728

Watson, III, W A

Excitation functions for the reactions /sup 56/Fe(p,mp) and /sup 56/Fe(p,p') were measured from E/sub p/ = 3.1 to 4.0 MeV at laboratory angles of 89, 106, 124, 149, and 160/sup 0/. These experiments were performed using the high resolution system of the TUNLFN tandem accelerator: the overall energy resolution varied between 420 and 500 eV. The excitation functions were analyzed with a multi-level, multi-channel R-matrix formalism. Over 340 resonances were observed, about half of which were d-wave resonances. Angular distributions of de-excitation ..gamma..-rays were measured for those 1 = 2 resonances with appreciable inelastic cross sections, as well as for selected 1 = 1 resonances (a total of about 140 resonances). The ..gamma..-ray data was of particular value in determining the j-value for certain resonances. Isobaric analogues of the following states in /sup 57/Fe were observed: the 5/2/sup -/ state at 2.207 MeV, the 9/2/sup -/ state at 2.445 meV, the 5/2/sup -/ state at 2.506 MeV, the 3/2/sup -/ state at 2.565 MeV, and the 1/2/sup -/ state at 2.697 MeV. Each of these analogue states had observable fine structure. The distributions were fit to a theoretical curve to obtain values for the analogue state energies, reduced widths, spreading widths, and asymmetry parameters. Spectroscopic factors were calculated and compared with the parent state spectroscopic factors obtained in (d,p) studies. The statistical properties of the observed levels were investigated in terms of the random matrix theory. Strength functions were calculated for each of the sequences for which sufficient levels were observed (1/2/sup -/, 1/2/sup -/, 3/2/sup -/, 3/2/sup -/, and 5/2/sup -/). The effects of missing levels were included in the calculation. General agreement with previous work is found. The spin dependence of the level density is calculated again including the correction for missing levels.

• Research Organization: Duke Univ., Durham, NC (USA)
• OSTI ID: 6244728
• Country of Publication: United States
• Language: English

Related Subjects

651523* -- Nuclear Properties & Reactions
A=39-58
Experimental-- Energy Levels & Transitions-- (-1987)
651525 -- Nuclear Properties & Reactions
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Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
COBALT 57
COBALT ISOTOPES
CROSS SECTIONS
DATA
DAYS LIVING RADIOISOTOPES
DISTRIBUTION
ELASTIC SCATTERING
ELECTROMAGNETIC RADIATION
ELECTRON CAPTURE RADIOISOTOPES
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL DENSITY
EXCITATION FUNCTIONS
EXPERIMENTAL DATA
FUNCTIONS
GAMMA RADIATION
HADRON REACTIONS
INELASTIC SCATTERING
INFORMATION
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
IRON 56 TARGET
ISOBARIC ANALOGS
ISOTOPES
MEV RANGE
MEV RANGE 01-10
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
ODD-EVEN NUCLEI
PARTICLE PROPERTIES
PROTON REACTIONS
RADIATIONS
RADIOISOTOPES
SCATTERING
SPECTROSCOPIC FACTORS
SPIN
STRENGTH FUNCTIONS
TARGETS