|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||PHYSICS AND MATHEMATICS ♦ BETA DECAY ♦ CAPTURE ♦ CROSS SECTIONS ♦ ENERGY RANGE ♦ FLUORINE 17 ♦ GAMMA RADIATION ♦ KEV RANGE ♦ MEASURED VALUES ♦ MEV RANGE ♦ NEON ♦ NEON 20 ♦ NUCLEAR MODELS ♦ NUCLEAR REACTIONS ♦ OXYGEN ♦ OXYGEN 16 ♦ POSITRONS ♦ PROTONS ♦ RADIOACTIVITY ♦ SODIUM 21 ♦ TARGETS|
|Abstract||A study has been made of the O/sup 16/(p gamma )F/sup 17/ and Ne/sup 20/ (p, gamma )Na/sup 21/ reactions by counting the positron activities of F/sup 17/ and Na/sup 21/ following proton bombardment of oxygen and neon targets. The O/ sup 16/(p, gamma )F/sup 17/ cross section was measured at a proton bombarding energy of 616 kev to be 0.29 plus or minus 0.03 microbarn and the Ne/sup 20/(p, gamma ) Na/sup 22/cross section was measured at 1100 kev to be 1.3 plus or minus 0.7 microbarns. These cross sections are consistent with the reaction process in each case being one of direct radiative capture. In addition, the energy dependence of the also consistent with the direct-capture hypothesis. Both of these reactions are believed to be important at the thermal energies effective in stars. For such energies the cross-section parameter S/sub o/ was estimated to be S/sub o/ = 5 plus or minus 1 kev-barns for O/sup 16/(p, gamma )F/sup 17/, and S/sub o/ --80 ke vbarns for Ne/sup 20/(p, gamma )Na/sup 21/. (auth)|
|Learning Resource Type||Article|
|Publisher Department||California Inst. of Tech., Pasadena ♦ Carnegie Inst. of Washington, D.C.|
|Organization||California Inst. of Tech., Pasadena ♦ Carnegie Inst. of Washington, D.C.|
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