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Prog. Theor. Phys. Vol. 16 No. 5 (1956) pp. 507-527

[ Full Text PDF : FREE ACCESS (1670K) ]

Helium Capturing Reactions in Stars

Satio Hayakawa, Chushiro Hayashi,* Mitsuo Imoto* and Ken Kikuchi**

Research Institute for Fundamental Physics, Kyoto University, Kyoto
*Department of Physics, Kyoto University, Kyoto
**Department of Physics, Osaka University, Osaka

(Received July 12, 1956)

Abstract:

The generation of 12C, 16O and 20Ne by successive α-capturing processes in the helium core of stars is calculated under the condition at temperature ∼108 °K. The rates of forming 12C and 20Ne are found to be much larger than the previous calculations by Salpeter, Öpik and Hoyle, due to the resonance levels recently discovered. The production rates of 24Mg to 40Ca are also estimated. The formation of these nuclei is found to be negligible at temperatures below 4×108 °K. The luminosity of such stars of globular clusters belonging to the horizontal branch in the H-R diagram that are supposed to be burning helium is accounted for in terms of the above thermonuclear reactions at the central temperature of (1.40 ±0.10)×108 °K and the density of about 103g cm-3. The lifetime of a star in this evolutionary stage is estimated roughly as 107 years. In this course of evolution 20Ne is formed more abundant than others, in disagreement with the average cosmic abundances of 12C, 16O and 20Ne. The modification of the abundances after this stage is suggested as necessary.


URL : http://ptp.ipap.jp/link?PTP/16/507/
DOI : 10.1143/PTP.16.507

[ Full Text PDF : FREE ACCESS (1670K) ] Citation:

See Also:

References:

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  9. Progress of Theoretical Physics Vol. 27 No. 1 (1962) pp. 145-154 :
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  10. Progress of Theoretical Physics Vol. 27 No. 6 (1962) pp. 1233-1252 :
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  11. Progress of Theoretical Physics Vol. 28 No. 4 (1962) pp. 585-588 :
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  12. Progress of Theoretical Physics Vol. 29 No. 5 (1963) pp. 699-711 :
    Synthesis of 4N- and Their Neighboring Nuclei by the Rapid Nuclear Process
    Hiroyuki Tsuji

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