(p,gamma) resonance strengths in the S-D shell

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

OSTI ID:5436403

Paine, B M

Since some of the discrepancies in the literature involve relative measurements between different nuclei with chemical compound targets containing pairs of nuclei of interest, a system was developed for conducting similar measurements with the added facility for target analysis by Rutherford backscattering. Resonances in the energy range 0.5 to 2.0 MeV in the (p,..gamma..) reactions on /sup 23/Na, /sup 26/Mg, /sup 27/Al, /sup 30/Si, /sup 31/P, /sup 34/S, /sup 35/Cl, /sup 37/Cl, /sup 39/K and /sup 40/Ca were selected and a series of relative strength measurements was conducted by the thin target technique. In addition, absolute strengths were measured for the E/sub p/ = 632 and 992 keV resonances in /sup 27/Al(p,..gamma..)/sup 28/Si and the E/sub p/ = 620 keV resonance in /sup 30/Si(p,..gamma..)/sup 31/P by both the semi-thick and thin target techniques. The target thickness, needed for the latter technique, was determined from Rutherford backscattering. Gamma-ray yield was measured with either a NaI(Tl) or a Ge(Li) detector. The efficiency of the Ge(Li) for detecting radiation from the appropriate resonances was related experimentally to that of the NaI(Tl) and the absolute efficiency of the NaI(Tl) detector was measured experimentally for ..gamma..-ray energies from 0.7 to 10.8 MeV. These experimental efficiencies were compared with the results of a calculation based on published ..gamma..-ray attenuation coefficients and the measured detector geometry. Absolute strengths were deduced for all of the resonances under investigation by normalizing to the absolute measurements on the /sup 27/Al(p,..gamma..)/sup 28/Si resonances. These strengths, together with published relative measurements between isotopes of the appropriate elements, were used to produce a table of the strengths of selected resonances in 16 s-d shell nuclei. These can now serve as reliable standards for the normalization of all relative measurements on these nuclides.

• OSTI ID: 5436403
• Country of Publication: United States
• Language: English

Related Subjects

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM 27 TARGET
BARYON REACTIONS
CALCIUM 40 TARGET
CAPTURE
CHARGED-PARTICLE REACTIONS
CHLORINE 35 TARGET
CHLORINE 37 TARGET
ELECTROMAGNETIC RADIATION
ENERGY RANGE
FUNCTIONS
GAMMA RADIATION
HADRON REACTIONS
IONIZING RADIATIONS
LIGHT NUCLEI
MAGNESIUM 26 TARGET
MEV RANGE
MEV RANGE 01-10
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
PHOSPHORUS 31 TARGET
POTASSIUM 39 TARGET
PROTON REACTIONS
RADIATIONS
RESONANCE
SILICON 30 TARGET
SODIUM 23 TARGET
STRENGTH FUNCTIONS
SULFUR 34 TARGET
TARGETS