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Change of Nuclear Beta-Decay Characteristics in Strongly Heated Substance and p-Element Synthesis in Massive Stars |
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PP: 1-10 |
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doi:10.18576/jrna/020101
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Author(s) |
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Igor V. Kopytin,
Imad A. H. AL-Hayali,
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Abstract |
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| For “nuclear” temperatures (in the (2 – 3)∙109 K range) the rate temperature dependences of β processes in massive star matter are obtained. The thermal electron and positron nuclear β decays and electron captures (K capture and unbound electron capture) and photobeta decays from ground and excited nuclear states are considered. The quantum degeneracy of electron gas and the ionization of atomic K shells in a strongly heated substance are taken into account. For the multidecay odd-odd nuclei the temperature dependences of coefficients defining β--decay fractions in their total lifetimes are calculated. It is shown that the distinction of this coefficients from the experimental values obtained under “normal” temperatures may be significant. The physical model of the p-isotope synthesis in massive star matter is suggested and p nucleus abundances are calculated. It is found that during the combustion of oxygen layer in a massive star for 19 from 33 p-nuclei it is possible to get their observed ‘solar’ abundances. |
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