Physics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pthph..61..452o&link_type=abstract
Progress of Theoretical Physics, Vol. 61, No. 2, pp. 452-465
Physics
3
Scientific paper
Nuclear synthetic processes taking place in the inner shells of exploding supernova are examined. Applying the mα = 8m&sun; model by Arnett, nuclear reactions occurring during the states ofshell implosion and explosion are followed. The r-process is found to proceed in the innermost shell of 1.34≤ mr/1033g ≤ 1.68,whereas an intermediate process between r- and explosive e-processes, called extended-e-process, occurs in the outer shell of 1.68 ≤ mr/1033g ≲ 2.5. Within these shells neutron-excess nuclides with A ≳ 50 can be produced and the stellar-shell-integrated abundances in the region A ≳ 80 are found to be in excellent agreement with observations. It becomes clear that the extended-e-process cannot explain the abundances of the neutron-excess nuclides such as 50Ti, 54Cr, 58Fe and64Ni nor the nuclides around A = 70 contrary to the previous expectation. It also appears that the r-abundance peak at around A = 80 does originate from the r-process but by a mass fraction of only 0.3, the remainder being contributed from the extended-e-process and that almost all of the (s+r)-nuclides around A = 80 may possibly be the extended-t-dominant nuclides.
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