The r-process in the light of a microscopic model for nuclear masses

Details The r-process in the light of a microscopic model for nuclear masses The r-process in the light of a microscopic model for nuclear masses

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...262...73g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 1, p. 73-82.

Astronomy and Astrophysics

Astrophysics

14

Astronomical Models, Neutron Cross Sections, Nuclear Fusion, Particle Mass, Supernovae, Abundance, Canonical Forms, Neutron Decay

Scientific paper

The influence of nuclear mass models on the r-abundance distribution is investigated in the framework of the canonical r-process model. Among the nuclear properties of interest for the r-process, nuclear masses clearly have the most decisive influence. They not only determine the position of the neutron drip line, the value of the neutron separation energies and the beta-decay Q-values (and consequently affect the neutron capture cross sections and the beta-decay rates), but also indirectly modify the rates of fission and beta-delayed processes. All r-process calculations have so far made use of droplet-type mass formulas only, the reliability of which remains very uncertain along the r-process path (i.e., far off the experimentally known region). A new mass table based on the microscopic Extended Thomas-Fermi plus Strutinsky Integral method is now available and has been used to calculate the production of r-nuclei within the waiting point approximation. The r-abundance distribution obtained with microscopic masses shows significant differences from the one derived with a droplet mass formula. These differences are analyzed in detail.

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