Physics
Scientific paper
Mar 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974pthph..51..726s&link_type=abstract
Progress of Theoretical Physics, Vol. 51, No. 3, pp. 726-744
Physics
30
Scientific paper
Thermal and chemical properties of neutron-rich matter ejected by supernova explosion are investigated along the line of a previous work of the author. In this investigation, the dynamical r-process is worked out for the first time by taking into account a thermodynamical equation. Computations are carried out for a number of sets of expansion speeds and initial n/p ratios at high temperature, and for two extreme cases on fission cutoff, i.e., the pessimistic and optimistic cases on the synthesis of superheavy nuclei.{ } By this investigation the following results are obtained.
1) The energy release accompanied with beta decays and fissions is indispensable in reproducing the observed abundance of the r-process elements.
2) The abundance of the r-process products is almost independent of the initial n/p ratio, but depends on the expansion speed of the supernova. To reproduce the r-process peaks of observed abundances the expansion speed of supernova should be greater than the free fall speed but smaller than thirty times the free fall speed.
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