The screening of photodisintegration reactions

Details The screening of photodisintegration reactions The screening of photodisintegration reactions

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...154..115m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 154, no. 1-2, Jan. 1986, p. 115-118. Sponsorship: Ministry of Education, Scien

Physics

Nuclear Physics

8

Dense Plasmas, Nuclear Reactions, Nuclei (Nuclear Physics), Plasma Resonance, Stellar Evolution, Strongly Coupled Plasmas, Neon Isotopes

Scientific paper

The rates of photodisintegration reactions in a strongly coupled plasma are calculated, with emphasis given to resonant and nonresonant plasmas. It is shown that screening of the photodisintegration produces a decrease in the potential barrier between the two interacting nuclei, together with an increase in the energy threshold of the reaction. It is found that these two reactions almost 'cancel' each other out, the result being that the photodisintegration is slightly reduced by the screening effects. The astrophysical implications of the photodisintegration screening effect are illustrated using the example of photodisintegration of Ne-20 in the degenerate O + Ne + Mg cores of evolved stars of 8-10 solar mass.

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