Physics – Nuclear Physics
Scientific paper
Aug 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967nupha.100..657a&link_type=abstract
Nuclear Physics A, Volume 100, Issue 3, p. 657-672.
Physics
Nuclear Physics
6
Scientific paper
In this work, we compare positon capture and photo-beta disintegration probabilities in several stellar conditions.
We show that the second process can be neglected with regard to the first one in strongly endothermic nuclear transitions, whereas photo-beta disintegration can be competitive with positon capture and even can have a greater likelihood than the latter process in weakly endothermic and exothermic transitions.
In the range of temperature we consider here (T ~ 109 °K), it appears that the lifetime ratio τ(ph)/τ(ec+) against photo-beta disintegration and positon capture is the smallest for densities in the neighbourhood of 106 g/cm3.
Thus, we arrive at the conclusion that the photo-beta process can play a role in the synthesis of two ``p'' elements at least, 62144Sm and 80196Hg, for which the ratios τ(ph)/τ(ec+) are close to 10 and 20, respectively, in the most favourable stellar conditions.
Stagiaire de Recherches au Fonds National de la Recherche Scientifique.
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